Bug 12780 – REGRESSION (r19341-r19385): Reproducible crash in "onselectstart" event

• Component: WebCore Misc.
• Status: RESOLVED FIXED

[Tom Brown]

When the "HTML" tag contains the "XMLNS:CUSTOM" declaration, any click on the document causes an "onselectstart" event to fire. Within this event, the srcElement points to an element which has no parent node. If this element is appended to the DOM tree, and then removed from the DOM tree, webkit crashes.

[Tom Brown]

Date/Time:      2007-02-15 17:39:15.231 -0700
OS Version:     10.4.8 (Build 8L2127)
Report Version: 4

Command: Safari
Path:    /Applications/Safari.app/Contents/MacOS/Safari
Parent:  WindowServer [78]

Version: ??? (19630)

PID:    4095
Thread: 0

Exception:  EXC_BAD_ACCESS (0x0001)
Codes:      KERN_PROTECTION_FAILURE (0x0002) at 0x00000000

Thread 0 Crashed:
0   com.apple.WebCore        	0x01182aad WebCore::RenderTextControl::calcHeight() + 55
1   com.apple.WebCore        	0x01184059 WebCore::RenderTextControl::layout() + 27
2   com.apple.WebCore        	0x010cda5b WebCore::FrameView::layout(bool) + 439
3   com.apple.WebCore        	0x010cf4d9 WebCore::Document::updateLayout() + 81
4   com.apple.WebCore        	0x010d8d8b WebCore::Document::updateLayoutIgnorePendingStylesheets() + 87
5   com.apple.WebCore        	0x011c649e WebCore::createMarkup(WebCore::Node const*, WebCore::EChildrenOnly, WTF::Vector<WebCore::Node*, (unsigned long)0>*, WebCore::EAnnotateForInterchange) + 70
6   com.apple.WebCore        	0x0100e0fd WebCore::HTMLElement::outerHTML() const + 53
7   com.apple.WebCore        	0x0123b45b KJS::JSHTMLElement::getValueProperty(KJS::ExecState*, int) const + 1097
8   com.apple.JavaScriptCore 	0x0013ac8c KJS::JSObject::get(KJS::ExecState*, KJS::Identifier const&) const + 116
9   com.apple.JavaScriptCore 	0x00130455 KJS::DotAccessorNode::evaluate(KJS::ExecState*) + 135
10  com.apple.JavaScriptCore 	0x0012ee1e KJS::AddNode::evaluate(KJS::ExecState*) + 128
11  com.apple.JavaScriptCore 	0x0012f462 KJS::ArgumentListNode::evaluateList(KJS::ExecState*) + 56
12  com.apple.JavaScriptCore 	0x0012fd79 KJS::FunctionCallResolveNode::evaluate(KJS::ExecState*) + 427
13  com.apple.JavaScriptCore 	0x00133a83 KJS::ExprStatementNode::execute(KJS::ExecState*) + 117
14  com.apple.JavaScriptCore 	0x00136849 KJS::SourceElementsNode::execute(KJS::ExecState*) + 421
15  com.apple.JavaScriptCore 	0x001339a1 KJS::BlockNode::execute(KJS::ExecState*) + 67
16  com.apple.JavaScriptCore 	0x0012245f KJS::DeclaredFunctionImp::execute(KJS::ExecState*) + 45
17  com.apple.JavaScriptCore 	0x00121f28 KJS::FunctionImp::callAsFunction(KJS::ExecState*, KJS::JSObject*, KJS::List const&) + 338
18  com.apple.JavaScriptCore 	0x0013b820 KJS::JSObject::call(KJS::ExecState*, KJS::JSObject*, KJS::List const&) + 112
19  com.apple.WebCore        	0x01232c42 KJS::JSAbstractEventListener::handleEvent(WebCore::Event*, bool) + 1054
20  com.apple.WebCore        	0x010d0bd8 WebCore::Document::handleWindowEvent(WebCore::Event*, bool) + 166
21  com.apple.WebCore        	0x011ffd6b WebCore::EventTargetNode::dispatchGenericEvent(WTF::PassRefPtr<WebCore::Event>, int&, bool) + 257
22  com.apple.WebCore        	0x01200347 WebCore::EventTargetNode::dispatchEvent(WTF::PassRefPtr<WebCore::Event>, int&, bool, WebCore::EventTarget*) + 161
23  com.apple.WebCore        	0x012003ff WebCore::EventTargetNode::dispatchEvent(WTF::PassRefPtr<WebCore::Event>, int&, bool) + 61
24  com.apple.WebCore        	0x011ffa26 WebCore::EventTargetNode::dispatchHTMLEvent(WebCore::AtomicString const&, bool, bool) + 128
25  com.apple.WebCore        	0x011683ce WebCore::RenderObject::shouldSelect() const + 60
26  com.apple.WebCore        	0x013cdf98 WebCore::EventHandler::handleMousePressEventSingleClick(WebCore::MouseEventWithHitTestResults const&) + 78
27  com.apple.WebCore        	0x013cedb8 WebCore::EventHandler::handleMousePressEvent(WebCore::MouseEventWithHitTestResults const&) + 254
28  com.apple.WebCore        	0x013cf209 WebCore::EventHandler::handleMousePressEvent(WebCore::PlatformMouseEvent const&) + 997
29  com.apple.WebCore        	0x013c9e66 WebCore::EventHandler::mouseDown(NSEvent*) + 456
30  com.apple.WebKit         	0x0032e766 -[WebHTMLView mouseDown:] + 410
31  com.apple.AppKit         	0x9334c3af -[NSWindow sendEvent:] + 5279
32  com.apple.Safari         	0x0002338e 0x1000 + 140174
33  com.apple.AppKit         	0x9333e350 -[NSApplication sendEvent:] + 5023
34  com.apple.Safari         	0x00022f1e 0x1000 + 139038
35  com.apple.AppKit         	0x93268dfe -[NSApplication run] + 547
36  com.apple.AppKit         	0x9325cd2f NSApplicationMain + 573
37  com.apple.Safari         	0x0005f7de 0x1000 + 387038
38  com.apple.Safari         	0x0005f6f9 0x1000 + 386809

Thread 1:
0   libSystem.B.dylib        	0x90009857 mach_msg_trap + 7
1   com.apple.CoreFoundation 	0x9082969a CFRunLoopRunSpecific + 2014
2   com.apple.CoreFoundation 	0x90828eb5 CFRunLoopRunInMode + 61
3   com.apple.Foundation     	0x9262aa9b +[NSURLConnection(NSURLConnectionInternal) _resourceLoadLoop:] + 259
4   com.apple.Foundation     	0x925f536c forkThreadForFunction + 123
5   libSystem.B.dylib        	0x90023d87 _pthread_body + 84

Thread 2:
0   libSystem.B.dylib        	0x90009857 mach_msg_trap + 7
1   com.apple.CoreFoundation 	0x9082969a CFRunLoopRunSpecific + 2014
2   com.apple.CoreFoundation 	0x90828eb5 CFRunLoopRunInMode + 61
3   com.apple.Foundation     	0x92651c4e +[NSURLCache _diskCacheSyncLoop:] + 206
4   com.apple.Foundation     	0x925f536c forkThreadForFunction + 123
5   libSystem.B.dylib        	0x90023d87 _pthread_body + 84

Thread 3:
0   libSystem.B.dylib        	0x90024427 semaphore_wait_signal_trap + 7
1   com.apple.Foundation     	0x9264b2f8 -[NSConditionLock lockWhenCondition:] + 39
2   com.apple.Syndication    	0x9a47c052 -[AsyncDB _run:] + 181
3   com.apple.Foundation     	0x925f536c forkThreadForFunction + 123
4   libSystem.B.dylib        	0x90023d87 _pthread_body + 84

Thread 4:
0   libSystem.B.dylib        	0x90019d3c select + 12
1   libSystem.B.dylib        	0x90023d87 _pthread_body + 84

Thread 5:
0   libSystem.B.dylib        	0x90024427 semaphore_wait_signal_trap + 7
1   com.apple.Foundation     	0x9264b2f8 -[NSConditionLock lockWhenCondition:] + 39
2   com.apple.AppKit         	0x93346270 -[NSUIHeartBeat _heartBeatThread:] + 377
3   com.apple.Foundation     	0x925f536c forkThreadForFunction + 123
4   libSystem.B.dylib        	0x90023d87 _pthread_body + 84

Thread 0 crashed with X86 Thread State (32-bit):
  eax: 0x00000000    ebx: 0x010cd8b2 ecx: 0x15999690 edx: 0x15999690
  edi: 0x01843ee0    esi: 0x15999744 ebp: 0xbfffec48 esp: 0xbfffebd0
   ss: 0x0000001f    efl: 0x00010206 eip: 0x01182aad  cs: 0x00000017
   ds: 0x0000001f     es: 0x0000001f  fs: 0x00000000  gs: 0x00000037

Binary Images Description:
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0x90807000 - 0x908cffff com.apple.CoreFoundation 6.4.6 (368.27)	/System/Library/Frameworks/CoreFoundation.framework/Versions/A/CoreFoundation
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0x91661000 - 0x916defff com.apple.print.framework.PrintCore 4.6 (177.13)	/System/Library/Frameworks/ApplicationServices.framework/Versions/A/Frameworks/PrintCore.framework/Versions/A/PrintCore
0x9170b000 - 0x917b4fff com.apple.QD 3.10.21 (???)	/System/Library/Frameworks/ApplicationServices.framework/Versions/A/Frameworks/QD.framework/Versions/A/QD
0x917da000 - 0x91825fff com.apple.HIServices 1.5.2 (???)	/System/Library/Frameworks/ApplicationServices.framework/Versions/A/Frameworks/HIServices.framework/Versions/A/HIServices
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0x91bd0000 - 0x91c5efff com.apple.vImage 2.5	/System/Library/Frameworks/Accelerate.framework/Versions/A/Frameworks/vImage.framework/Versions/A/vImage
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0x9a479000 - 0x9a4b0fff com.apple.Syndication 1.0.6 (54)	/System/Library/PrivateFrameworks/Syndication.framework/Versions/A/Syndication
0x9a4cc000 - 0x9a4defff com.apple.SyndicationUI 1.0.6 (54)	/System/Library/PrivateFrameworks/SyndicationUI.framework/Versions/A/SyndicationUI

Model: Macmini1,1, BootROM MM11.0055.B08, 2 processors, Intel Core Duo, 1.66 GHz, 1 GB
Graphics: Intel GMA 950, GMA 950, Built-In, spdisplays_integrated_vram
Memory Module: BANK 0/DIMM0, 512 MB, DDR2 SDRAM, 667 MHz
Memory Module: BANK 1/DIMM1, 512 MB, DDR2 SDRAM, 667 MHz
AirPort: spairport_wireless_card_type_airport_extreme (0x168C, 0x86), 0.1.30
Bluetooth: Version 1.7.9f12, 2 service, 1 devices, 1 incoming serial ports
Network Service: Built-in Ethernet, Ethernet, en0
Serial ATA Device: FUJITSU MHV2080BHPL, 74.53 GB
Parallel ATA Device: MATSHITADVD-R   UJ-846
USB Device: Microsoft Wheel Mouse Optical®, Microsoft, Up to 1.5 Mb/sec, 500 mA
USB Device: Bluetooth HCI, Up to 12 Mb/sec, 500 mA
USB Device: IR Receiver, Apple Computer, Inc., Up to 12 Mb/sec, 500 mA
USB Device: DELL USB Keyboard, DELL, Up to 1.5 Mb/sec, 500 mA

[Tom Brown]

Created attachment 13191 [details]
Reduced crash case

1. Open the test case.
2. Click on the input box.
3. Crash.

An invalid "event.srcElement" is only sent when an INPUT element is the cause of the event.

[Alexey Proskuryakov]

I think the XMLNS part is red herring - it doesn't mean anything at all in HTML, and would just be a syntax error in XML. I'm getting a crash with a debug build of r19653 with or without it (in both cases, with a different stack trace).

Thread 0 Crashed:
0   com.apple.WebCore        	0x01645668 WebCore::RenderObject::positionForPoint(WebCore::IntPoint const&) + 40 (RenderObject.h:536)
1   com.apple.WebCore        	0x01525c64 WebCore::EventHandler::handleMousePressEventSingleClick(WebCore::MouseEventWithHitTestResults const&) + 588 (EventHandler.cpp:228)
2   com.apple.WebCore        	0x01527c9c WebCore::EventHandler::handleMousePressEvent(WebCore::MouseEventWithHitTestResults const&) + 572 (EventHandler.cpp:297)
3   com.apple.WebCore        	0x0152ac44 WebCore::EventHandler::handleMousePressEvent(WebCore::PlatformMouseEvent const&) + 1628 (EventHandler.cpp:820)
4   com.apple.WebCore        	0x01522f9c WebCore::EventHandler::mouseDown(NSEvent*) + 476 (EventHandlerMac.mm:602)
5   com.apple.WebKit         	0x003511c8 -[WebHTMLView mouseDown:] + 544 (WebHTMLView.mm:2870)
6   com.apple.AppKit         	0x93762890 -[NSWindow sendEvent:] + 4616
7   com.apple.Safari         	0x00021734 0x1000 + 132916
8   com.apple.AppKit         	0x9370b8d4 -[NSApplication sendEvent:] + 4172
9   com.apple.Safari         	0x00021238 0x1000 + 131640
10  com.apple.AppKit         	0x93702d10 -[NSApplication run] + 508

>  if (event.srcElement.parentNode == null)

The event.srcElement in that case is the text field's inner DIV. I don't think a shadow node should ever be exposed through the DOM like that!

Using nightly builds I narrowed down the regression to somewhere between r19341 and r19385. Among the changes in that range, <http://trac.webkit.org/projects/webkit/changeset/19378> is the prime suspect.

Created attachment 13200 [details]
Don't bubble/capture across the shadow DOM boundary if not SVG

Includes layout test and change log. No layout test regressions, but I don't know if the SVG <use> tests cover this (I expect they do).

[Darin Adler]

Comment on attachment 13200 [details]
Don't bubble/capture across the shadow DOM boundary if not SVG

r=me

[Adele Peterson]

Committed revision 19681.