Bug 23956 – Safari crashes when cloneNode fails (cloning a XML element with an invalid nodeName)

• Status: RESOLVED
• Resolution: FIXED
• Component: DOM

[Eric Seidel (no email)]

Safari crashes when cloneNode fails

In debug mode:
ASSERTION FAILED: !ec
(/Users/eseidel/Projects/WebKit/WebCore/dom/Element.cpp:93 virtual WTF::PassRefPtr<WebCore::Node> 
WebCore::Element::cloneNode(b

Release mode crashes.

Reported from:
http://code.google.com/p/chromium/issues/detail?id=7104

What steps will reproduce the problem?
1. Visit http://www.moschorus.com/centre/MosPub/solo_fr/index.html
2. Click 'Product'/'Download' or one of the other 5 top menu links 


Process:         Safari [30638]
Path:            /Applications/Safari.app/Contents/MacOS/Safari
Identifier:      com.apple.Safari
Version:         4.0 (5528.1)
Build Info:      WebBrowser-55280100~3
Code Type:       X86 (Native)
Parent Process:  perl [30632]

Date/Time:       2009-02-13 14:16:49.640 -0800
OS Version:      Mac OS X 10.5.6 (9G55)
Report Version:  6

Exception Type:  EXC_BAD_ACCESS (SIGSEGV)
Exception Codes: KERN_INVALID_ADDRESS at 0x00000000bbadbeef
Crashed Thread:  0

Thread 0 Crashed:
0   com.apple.WebCore             	0x036f6754 WebCore::Element::cloneNode(bool) + 226 (Element.cpp:93)
1   com.apple.WebCore             	0x035b35a2 WebCore::ContainerNode::cloneChildNodes(WebCore::ContainerNode*) + 144 (ContainerNode.cpp:637)
2   com.apple.WebCore             	0x036f67f2 WebCore::Element::cloneNode(bool) + 384 (Element.cpp:104)
3   com.apple.WebCore             	0x035b35a2 WebCore::ContainerNode::cloneChildNodes(WebCore::ContainerNode*) + 144 (ContainerNode.cpp:637)
4   com.apple.WebCore             	0x036f67f2 WebCore::Element::cloneNode(bool) + 384 (Element.cpp:104)
5   com.apple.WebCore             	0x035b35a2 WebCore::ContainerNode::cloneChildNodes(WebCore::ContainerNode*) + 144 (ContainerNode.cpp:637)
6   com.apple.WebCore             	0x036f67f2 WebCore::Element::cloneNode(bool) + 384 (Element.cpp:104)
7   com.apple.WebCore             	0x039494ef WebCore::jsNodePrototypeFunctionCloneNode(JSC::ExecState*, JSC::JSObject*, JSC::JSValuePtr, JSC::ArgList const&) + 197 (JSNode.cpp:1279)
8   com.apple.JavaScriptCore      	0x005593ba JSC::Interpreter::cti_op_call_NotJSFunction(void*, ...) + 534 (Interpreter.cpp:4891)
9   com.apple.JavaScriptCore      	0x005524f0 jscGeneratedNativeCode + 0 (Interpreter.cpp:4174)
10  com.apple.JavaScriptCore      	0x00573df8 JSC::JITCode::execute(JSC::RegisterFile*, JSC::ExecState*, JSC::JSGlobalData*, JSC::JSValuePtr*) + 58 (JITCode.h:86)
11  com.apple.JavaScriptCore      	0x0055b0d4 JSC::Interpreter::execute(JSC::FunctionBodyNode*, JSC::ExecState*, JSC::JSFunction*, JSC::JSObject*, JSC::ArgList const&, JSC::ScopeChainNode*, JSC::JSValuePtr*) + 888 (Interpreter.cpp:934)
12  com.apple.JavaScriptCore      	0x004a3f43 JSC::JSFunction::call(JSC::ExecState*, JSC::JSValuePtr, JSC::ArgList const&) + 139 (JSFunction.cpp:83)
13  com.apple.JavaScriptCore      	0x004a3ffc JSC::call(JSC::ExecState*, JSC::JSValuePtr, JSC::CallType, JSC::CallData const&, JSC::JSValuePtr, JSC::ArgList const&) + 178 (CallData.cpp:39)
14  com.apple.WebCore             	0x038d79d6 WebCore::JSAbstractEventListener::handleEvent(WebCore::Event*, bool) + 952 (JSEventListener.cpp:115)
15  com.apple.WebCore             	0x036a3f19 WebCore::Document::handleWindowEvent(WebCore::Event*, bool) + 253 (Document.cpp:2749)
16  com.apple.WebCore             	0x03a5aefc WebCore::Node::dispatchWindowEvent(WTF::PassRefPtr<WebCore::Event>) + 272 (Node.cpp:2484)
17  com.apple.WebCore             	0x03a64887 WebCore::Node::dispatchWindowEvent(WebCore::AtomicString const&, bool, bool) + 175 (Node.cpp:2491)
18  com.apple.WebCore             	0x036ade90 WebCore::Document::implicitClose() + 766 (Document.cpp:1589)
19  com.apple.WebCore             	0x03749d8f WebCore::FrameLoader::checkCallImplicitClose() + 183 (FrameLoader.cpp:1334)
20  com.apple.WebCore             	0x037563fd WebCore::FrameLoader::checkCompleted() + 211 (FrameLoader.cpp:1290)
21  com.apple.WebCore             	0x03757645 WebCore::FrameLoader::loadDone() + 17 (FrameLoader.cpp:1255)
22  com.apple.WebCore             	0x0369896a WebCore::DocLoader::setLoadInProgress(bool) + 116 (DocLoader.cpp:282)
23  com.apple.WebCore             	0x03d56e90 WebCore::Loader::Host::didFinishLoading(WebCore::SubresourceLoader*) + 538 (loader.cpp:312)
24  com.apple.WebCore             	0x03cb1100 WebCore::SubresourceLoader::didFinishLoading() + 176 (SubresourceLoader.cpp:185)
25  com.apple.WebCore             	0x03b919ec WebCore::ResourceLoader::didFinishLoading(WebCore::ResourceHandle*) + 24 (ResourceLoader.cpp:417)
26  com.apple.WebCore             	0x03b8f4fe -[WebCoreResourceHandleAsDelegate connectionDidFinishLoading:] + 172 (ResourceHandleMac.mm:603)
27  com.apple.Foundation          	0x96690cd7 -[NSURLConnection(NSURLConnectionReallyInternal) sendDidFinishLoading] + 87
28  com.apple.Foundation          	0x96690c43 _NSURLConnectionDidFinishLoading + 147
29  com.apple.CFNetwork           	0x9019822c URLConnectionClient::clientDidFinishLoading() + 174
30  com.apple.CFNetwork           	0x90196d69 URLConnectionClient::ClientConnectionEventQueue::processAllEventsAndConsumePayload(XConnectionEventInfo<XClientEvent, XClientEventParams>*, long) + 281
31  com.apple.CFNetwork           	0x90197da8 URLConnectionClient::processEvents() + 114
32  com.apple.CFNetwork           	0x90147d37 MultiplexerSource::perform() + 189
33  com.apple.CoreFoundation      	0x910f55f5 CFRunLoopRunSpecific + 3141
34  com.apple.CoreFoundation      	0x910f5cd8 CFRunLoopRunInMode + 88
35  com.apple.HIToolbox           	0x94b792c0 RunCurrentEventLoopInMode + 283
36  com.apple.HIToolbox           	0x94b790d9 ReceiveNextEventCommon + 374
37  com.apple.HIToolbox           	0x94b78f4d BlockUntilNextEventMatchingListInMode + 106
38  com.apple.AppKit              	0x91233d7d _DPSNextEvent + 657
39  com.apple.AppKit              	0x91233630 -[NSApplication nextEventMatchingMask:untilDate:inMode:dequeue:] + 128
40  com.apple.Safari              	0x00007b3e 0x1000 + 27454
41  com.apple.AppKit              	0x9122c66b -[NSApplication run] + 795
42  com.apple.AppKit              	0x911f98a4 NSApplicationMain + 574
43  com.apple.Safari              	0x000b2776 0x1000 + 726902

Thread 1:
0   libSystem.B.dylib             	0x960bb3ae __semwait_signal + 10
1   libSystem.B.dylib             	0x960e5d0d pthread_cond_wait$UNIX2003 + 73
2   com.apple.JavaScriptCore      	0x005b71bb WTF::ThreadCondition::wait(WTF::Mutex&) + 39 (ThreadingPthreads.cpp:233)
3   com.apple.WebCore             	0x0380cc05 WebCore::IconDatabase::syncThreadMainLoop() + 651 (IconDatabase.cpp:1336)
4   com.apple.WebCore             	0x0380e06e WebCore::IconDatabase::iconDatabaseSyncThread() + 1216 (IconDatabase.cpp:1038)
5   com.apple.WebCore             	0x0380e09d WebCore::IconDatabase::iconDatabaseSyncThreadStart(void*) + 23 (IconDatabase.cpp:942)
6   com.apple.JavaScriptCore      	0x005b7046 __ZN3WTFL16threadEntryPointEPv + 112 (Threading.cpp:58)
7   libSystem.B.dylib             	0x960e5095 _pthread_start + 321
8   libSystem.B.dylib             	0x960e4f52 thread_start + 34

Thread 2:
0   libSystem.B.dylib             	0x960bb3ae __semwait_signal + 10
1   libSystem.B.dylib             	0x960e5d0d pthread_cond_wait$UNIX2003 + 73
2   com.apple.JavaScriptCore      	0x005b71bb WTF::ThreadCondition::wait(WTF::Mutex&) + 39 (ThreadingPthreads.cpp:233)
3   com.apple.WebCore             	0x03a2fde2 WTF::MessageQueue<WTF::RefPtr<WebCore::LocalStorageTask> >::waitForMessage(WTF::RefPtr<WebCore::LocalStorageTask>&) + 60 (MessageQueue.h:90)
4   com.apple.WebCore             	0x03a2f1b4 WebCore::LocalStorageThread::localStorageThread() + 70 (LocalStorageThread.cpp:72)
5   com.apple.WebCore             	0x03a2f235 WebCore::LocalStorageThread::localStorageThreadStart(void*) + 17 (LocalStorageThread.cpp:61)
6   com.apple.JavaScriptCore      	0x005b7046 __ZN3WTFL16threadEntryPointEPv + 112 (Threading.cpp:58)
7   libSystem.B.dylib             	0x960e5095 _pthread_start + 321
8   libSystem.B.dylib             	0x960e4f52 thread_start + 34

Thread 3:
0   libSystem.B.dylib             	0x960b41c6 mach_msg_trap + 10
1   libSystem.B.dylib             	0x960bb9bc mach_msg + 72
2   com.apple.CoreFoundation      	0x910f50ae CFRunLoopRunSpecific + 1790
3   com.apple.CoreFoundation      	0x910f5cd8 CFRunLoopRunInMode + 88
4   com.apple.CFNetwork           	0x9011c052 CFURLCacheWorkerThread(void*) + 396
5   libSystem.B.dylib             	0x960e5095 _pthread_start + 321
6   libSystem.B.dylib             	0x960e4f52 thread_start + 34

Thread 4:
0   libSystem.B.dylib             	0x960b41c6 mach_msg_trap + 10
1   libSystem.B.dylib             	0x960bb9bc mach_msg + 72
2   com.apple.CoreFoundation      	0x910f50ae CFRunLoopRunSpecific + 1790
3   com.apple.CoreFoundation      	0x910f5cd8 CFRunLoopRunInMode + 88
4   com.apple.Foundation          	0x9668ed40 +[NSURLConnection(NSURLConnectionReallyInternal) _resourceLoadLoop:] + 320
5   com.apple.Foundation          	0x9662b7ed -[NSThread main] + 45
6   com.apple.Foundation          	0x9662b394 __NSThread__main__ + 308
7   libSystem.B.dylib             	0x960e5095 _pthread_start + 321
8   libSystem.B.dylib             	0x960e4f52 thread_start + 34

Thread 5:
0   libSystem.B.dylib             	0x961036f2 select$DARWIN_EXTSN + 10
1   libSystem.B.dylib             	0x960e5095 _pthread_start + 321
2   libSystem.B.dylib             	0x960e4f52 thread_start + 34

Thread 0 crashed with X86 Thread State (32-bit):
  eax: 0xbbadbeef  ebx: 0x036f6680  ecx: 0x00000000  edx: 0x00000000
  edi: 0x036aa556  esi: 0x071a1400  ebp: 0xbfffda78  esp: 0xbfffda10
   ss: 0x0000001f  efl: 0x00010282  eip: 0x036f6754   cs: 0x00000017
   ds: 0x0000001f   es: 0x0000001f   fs: 0x00000000   gs: 0x00000037
  cr2: 0xbbadbeef

Binary Images:
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  0x18f000 -   0x2baffb  com.apple.WebKit 530+ (530.1+) <d4e8da9251ec2437bf4cacbd9314331e> /Users/eseidel/Projects/build/Debug/WebKit.framework/Versions/A/WebKit
  0x467000 -   0x476ff8  SyndicationUI ??? (???) <1fe4e2e3c35f575a6122b9192644dae4> /System/Library/PrivateFrameworks/SyndicationUI.framework/Versions/A/SyndicationUI
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0x9038f000 - 0x903e0ff7  com.apple.HIServices 1.7.0 (???) <01b690d1f376e400ac873105533e39eb> /System/Library/Frameworks/ApplicationServices.framework/Versions/A/Frameworks/HIServices.framework/Versions/A/HIServices
0x90baa000 - 0x90baaffd  com.apple.vecLib 3.4.2 (vecLib 3.4.2) /System/Library/Frameworks/vecLib.framework/Versions/A/vecLib
0x90bab000 - 0x90c35fe3  com.apple.DesktopServices 1.4.7 (1.4.7) <d16642ba22c32f67be793ebfbe67ca3a> /System/Library/PrivateFrameworks/DesktopServicesPriv.framework/Versions/A/DesktopServicesPriv
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0x9100f000 - 0x91081fff  com.apple.PDFKit 2.1.2 (2.1.2) /System/Library/Frameworks/Quartz.framework/Versions/A/Frameworks/PDFKit.framework/Versions/A/PDFKit
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0x911bb000 - 0x911f2fff  com.apple.SystemConfiguration 1.9.2 (1.9.2) <8b26ebf26a009a098484f1ed01ec499c> /System/Library/Frameworks/SystemConfiguration.framework/Versions/A/SystemConfiguration
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0x91d18000 - 0x91d21fff  com.apple.speech.recognition.framework 3.7.24 (3.7.24) <d3180f9edbd9a5e6f283d6156aa3c602> /System/Library/Frameworks/Carbon.framework/Versions/A/Frameworks/SpeechRecognition.framework/Versions/A/SpeechRecognition
0x91d22000 - 0x91d3fff7  com.apple.QuickLookFramework 1.3.1 (170.9) /System/Library/Frameworks/QuickLook.framework/Versions/A/QuickLook
0x91d40000 - 0x91d42fff  com.apple.securityhi 3.0 (30817) <2b2854123fed609d1820d2779e2e0963> /System/Library/Frameworks/Carbon.framework/Versions/A/Frameworks/SecurityHI.framework/Versions/A/SecurityHI
0x91d43000 - 0x92153fef  libBLAS.dylib ??? (???) /System/Library/Frameworks/Accelerate.framework/Versions/A/Frameworks/vecLib.framework/Versions/A/libBLAS.dylib
0x921a3000 - 0x92253fff  edu.mit.Kerberos 6.0.12 (6.0.12) <685cc018c133668d0d3ac6a1cb63cff9> /System/Library/Frameworks/Kerberos.framework/Versions/A/Kerberos
0x92254000 - 0x923a6ff3  com.apple.audio.toolbox.AudioToolbox 1.5.2 (1.5.2) /System/Library/Frameworks/AudioToolbox.framework/Versions/A/AudioToolbox
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0x923e7000 - 0x927a5fea  libLAPACK.dylib ??? (???) /System/Library/Frameworks/Accelerate.framework/Versions/A/Frameworks/vecLib.framework/Versions/A/libLAPACK.dylib
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0x9292b000 - 0x9296afef  libTIFF.dylib ??? (???) <3589442575ac77746ae99ecf724f5f87> /System/Library/Frameworks/ApplicationServices.framework/Versions/A/Frameworks/ImageIO.framework/Versions/A/Resources/libTIFF.dylib
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0x92afb000 - 0x92b39ff7  libGLImage.dylib ??? (???) <1123b8a48bcbe9cc7aa8dd8e1a214a66> /System/Library/Frameworks/OpenGL.framework/Versions/A/Libraries/libGLImage.dylib
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0x92eac000 - 0x92eb8ffe  libGL.dylib ??? (???) /System/Library/Frameworks/OpenGL.framework/Versions/A/Libraries/libGL.dylib
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[Eric Seidel (no email)]

I've not tried to reduce this yet, but with a reduction this should be super-simple to fix.

[Mark Rowe (bdash)]

Can you please attach the crash log to the bug rather than pasting it in to the comments in the future?

[Eric Seidel (no email)]

Ok, it's trying to clone a node and getting an NAMESPACE_ERR when trying to createElementNS the clone.  The namespaceURI() passed in is null.  Still investigating.

[Eric Seidel (no email)]

So the nodeName in question is:
"imsss:objectives"

So the problem here is that we're using createElementNS which does namespace checks when really we want to just clone this XHTML-invalid, html node.

A simple test to reproduce this is probably

var node = document.createElement("foo:bar");
var clone = node.cloneNode(); // probably crashes.

[Eric Seidel (no email)]

Created attachment 27770 [details]
test case, crashes! (the logging can be removed when preparing to land)

[Eric Seidel (no email)]

The bug here is that since this is an XML document, we shouldn't have been able to create a node with an invalid prefix to begin with.  Document::createElement() should have thrown an error.  We'll need to check what FF and IE do here, and what the spec says, but I expect that createElement() should have just thrown an error and we would never have gotten to a case where we have an XML element with an invalid nodeName.

[Julien Chaffraix]

(In reply to comment #6)
> The bug here is that since this is an XML document, we shouldn't have been able
> to create a node with an invalid prefix to begin with. 
> Document::createElement() should have thrown an error.  We'll need to check
> what FF and IE do here, and what the spec says, but I expect that
> createElement() should have just thrown an error and we would never have gotten
> to a case where we have an XML element with an invalid nodeName.

I disagree with your conclusion. createElement is asked just to check that the string is a valid XML name by the DOM spec and throwing an exception will lead to regressions. As strange as it seems, createElement puts the string as the localName without any checks on the prefix and thus can lead to invalid XML names.
I have tried your test case with the other browser: FF abide by the spec, Opera mostly abide (it just set the namespace to 'http://www.example.com' (instead of null per DOM requirement)) and IE fails on document.implementation,createDocument.

The issue here is that we are calling createElementNS with nodes that may have been created by another method and thus do not play along with it. HTMLDocument::cloneNode calls directly the factory and it does not crash on such invalid nodes. I think we should do something equivalent in Document::cloneNode.

[Julien Chaffraix]

Taking the bug as I have a fix coming.

[Julien Chaffraix]

Created attachment 27857 [details]
Proposed fix: call Document::createElement(const QualifiedName&, bool) that does not checks. Also removed HTMLElement::cloneNode specialisation.

[Darin Adler]

Comment on attachment 27857 [details]
Proposed fix: call Document::createElement(const QualifiedName&, bool) that does not checks. Also removed HTMLElement::cloneNode specialisation.

I think this is fine. r=me

I think we should go even further and now that cloneElement doesn't have to be virtual, move the code into cloneElement and have cloneNode call cloneElement nstead of the other way around.

[Julien Chaffraix]

Landed patch in r41162.

Also filed bug 24110: "cloneNode should call cloneElement and not the reverse" to tackle the review comment (already assigned to me).

[Lucas Forschler]

Mass moving XML DOM bugs to the "DOM" Component.