158108 CVE-2016-4759 2016-05-25 19:44:29 -0700 Crash in TreeScope::focusedElement 2017-10-11 10:27:05 -0700 1 1 1 Unclassified WebKit WebKit Misc. WebKit Nightly Build Unspecified Unspecified RESOLVED FIXED InRadar P2 Normal --- 1 rniwa webkit-unassigned ap bfulgham cdumez commit-queue darin enrica kling koivisto oldest_to_newest 1196622 0 rniwa 2016-05-25 19:44:29 -0700 We can get into a state where a focused element's treeScope doesn't match that of Document yet the tree scope isn't of a shadow tree because we can get into a state where document->m_focusedElement->document() != document. Thread 0 Crashed:: Dispatch queue: com.apple.main-thread 0 com.apple.WebCore 0x00007fff96399aff WebCore::TreeScope::focusedElement() + 207 1 com.apple.WebCore 0x00007fff9629b37f WebCore::Document::removeFocusedNodeOfSubtree(WebCore::Node*, bool) + 47 2 com.apple.WebCore 0x00007fff966edc8e WebCore::Element::removeShadowRoot() + 78 3 com.apple.WebCore 0x00007fff96234239 WebCore::Element::~Element() + 25 4 com.apple.WebCore 0x00007fff962e700e WebCore::HTMLInputElement::~HTMLInputElement() + 14 5 com.apple.JavaScriptCore 0x00007fff8dfb8ff6 JSC::MarkedBlock::FreeList JSC::MarkedBlock::sweepHelper<true>(JSC::MarkedBlock::SweepMode) + 326 6 com.apple.JavaScriptCore 0x00007fff8da7f51b JSC::MarkedBlock::sweep(JSC::MarkedBlock::SweepMode) + 75 7 com.apple.JavaScriptCore 0x00007fff8de68500 JSC::IncrementalSweeper::sweepNextBlock() + 96 8 com.apple.JavaScriptCore 0x00007fff8da87bb8 JSC::IncrementalSweeper::doSweep(double) + 24 9 com.apple.JavaScriptCore 0x00007fff8da87aaa JSC::HeapTimer::timerDidFire(__CFRunLoopTimer*, void*) + 186 10 com.apple.CoreFoundation 0x00007fff8a1c3b94 __CFRUNLOOP_IS_CALLING_OUT_TO_A_TIMER_CALLBACK_FUNCTION__ + 20 11 com.apple.CoreFoundation 0x00007fff8a1c3823 __CFRunLoopDoTimer + 1075 12 com.apple.CoreFoundation 0x00007fff8a1c337a __CFRunLoopDoTimers + 298 13 com.apple.CoreFoundation 0x00007fff8a1ba871 __CFRunLoopRun + 1841 14 com.apple.CoreFoundation 0x00007fff8a1b9ed8 CFRunLoopRunSpecific + 296 15 com.apple.HIToolbox 0x00007fff95ece935 RunCurrentEventLoopInMode + 235 16 com.apple.HIToolbox 0x00007fff95ece76f ReceiveNextEventCommon + 432 17 com.apple.HIToolbox 0x00007fff95ece5af _BlockUntilNextEventMatchingListInModeWithFilter + 71 18 com.apple.AppKit 0x00007fff9438bdf6 _DPSNextEvent + 1067 19 com.apple.AppKit 0x00007fff9438b226 -[NSApplication _nextEventMatchingEventMask:untilDate:inMode:dequeue:] + 454 20 com.apple.AppKit 0x00007fff9437fd80 -[NSApplication run] + 682 21 com.apple.AppKit 0x00007fff94349368 NSApplicationMain + 1176 22 libxpc.dylib 0x00007fff9a786194 _xpc_objc_main + 795 23 libxpc.dylib 0x00007fff9a784bbe xpc_main + 494 24 com.apple.WebKit.WebContent 0x000000010cf70b4a 0x10cf70000 + 2890 25 libdyld.dylib 0x00007fff8b0c35ad start + 1 1196623 1 rniwa 2016-05-25 19:44:43 -0700 <rdar://problem/24337904> 1196661 2 rniwa 2016-05-25 23:25:48 -0700 Oh snap, that inconsistency is a lot tricker than I had initially thought. There is a fundamental API design issue at a hand. When an element is removed, we fire blur event if the element had been focused. We also fire unload event if it's an iframe. But we can focus the iframe back while unload event is being dispatched, or add the iframe back while focus event is being dispatched. In a way, we can end up in a mutually recursive behavior between unloading an iframe and focusing the same iframe inside blur/unload event handlers. The current behavior was introduced by http://trac.webkit.org/changeset/127534 four years ago, and it prefers keeping iframe in a consistent state. For now, I'm going to preserve the status quo and let this inconsistency manifest into m_focusedElement. 1196662 3 rniwa 2016-05-25 23:31:00 -0700 Huh, that doesn't work either because of assertions in UserActionElementSet. 1196969 4 279941 rniwa 2016-05-26 20:13:54 -0700 Created attachment 279941 Stops dispatching blur and change events 1196988 5 rniwa 2016-05-26 22:43:02 -0700 I ran all layout tests in both debug WTR and DRT on El Capitan. 1197239 6 279941 enrica 2016-05-27 15:25:07 -0700 Comment on attachment 279941 Stops dispatching blur and change events Look ok to me. 1197242 7 enrica 2016-05-27 15:25:54 -0700 Just a bit worried about compatibility but I think it is worth trying. 1197245 8 rniwa 2016-05-27 15:30:31 -0700 Committed r201471: <http://trac.webkit.org/changeset/201471> 279941 2016-05-26 20:13:54 -0700 2016-05-27 15:25:07 -0700 Stops dispatching blur and change events bug-158108-20160526201504.patch text/plain 25641 rniwa 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