208115 2020-02-23 15:02:10 -0800 Nullptr crash in WebCore::canHaveChildrenForEditing via CompositeEditCommand::insertNode 2020-03-07 19:59:40 -0800 1 1 1 Unclassified WebKit HTML Editing WebKit Local Build All All RESOLVED FIXED InRadar P2 Normal --- 1 shihchieh_lee webkit-unassigned ajuma bfulgham commit-queue dougk ews-feeder ews-watchlist mifenton product-security rniwa webkit-bug-importer wenson_hsieh oldest_to_newest 1622034 0 shihchieh_lee 2020-02-23 15:02:10 -0800 <rdar://56685655> #0 0x6c019d821 in WebCore::Node::getFlag(WebCore::Node::NodeFlags) const (Safari_ASAN_251639_8651f88be7c86f1fa8b4fafe3bc6b2caded79eda.app/Contents/Frameworks/WebCore.framework/Versions/A/WebCore:x86_64+0x19b821) #1 0x6c33db02d in WebCore::canHaveChildrenForEditing(WebCore::Node const&) (Safari_ASAN_251639_8651f88be7c86f1fa8b4fafe3bc6b2caded79eda.app/Contents/Frameworks/WebCore.framework/Versions/A/WebCore:x86_64+0x33d902d) #2 0x6c339c496 in WebCore::CompositeEditCommand::insertNodeAt(WTF::Ref<WebCore::Node, WTF::DumbPtrTraits<WebCore::Node> >&&, WebCore::Position const&) (Safari_ASAN_251639_8651f88be7c86f1fa8b4fafe3bc6b2caded79eda.app/Contents/Frameworks/WebCore.framework/Versions/A/WebCore:x86_64+0x339a496) #3 0x6c3466d28 in WebCore::InsertListCommand::listifyParagraph(WebCore::VisiblePosition const&, WebCore::QualifiedName const&) (Safari_ASAN_251639_8651f88be7c86f1fa8b4fafe3bc6b2caded79eda.app/Contents/Frameworks/WebCore.framework/Versions/A/WebCore:x86_64+0x3464d28) #4 0x6c34654ff in WebCore::InsertListCommand::doApplyForSingleParagraph(bool, WebCore::HTMLQualifiedName const&, WebCore::Range*) (Safari_ASAN_251639_8651f88be7c86f1fa8b4fafe3bc6b2caded79eda.app/Contents/Frameworks/WebCore.framework/Versions/A/WebCore:x86_64+0x34634ff) #5 0x6c34647af in WebCore::InsertListCommand::doApply() (Safari_ASAN_251639_8651f88be7c86f1fa8b4fafe3bc6b2caded79eda.app/Contents/Frameworks/WebCore.framework/Versions/A/WebCore:x86_64+0x34627af) #6 0x6c3396376 in WebCore::CompositeEditCommand::apply() (Safari_ASAN_251639_8651f88be7c86f1fa8b4fafe3bc6b2caded79eda.app/Contents/Frameworks/WebCore.framework/Versions/A/WebCore:x86_64+0x3394376) #7 0x6c344d78b in WebCore::executeInsertUnorderedList(WebCore::Frame&, WebCore::Event*, WebCore::EditorCommandSource, WTF::String const&) (Safari_ASAN_251639_8651f88be7c86f1fa8b4fafe3bc6b2caded79eda.app/Contents/Frameworks/WebCore.framework/Versions/A/WebCore:x86_64+0x344b78b) #8 0x6c30be1c7 in WebCore::Document::execCommand(WTF::String const&, bool, WTF::String const&) (Safari_ASAN_251639_8651f88be7c86f1fa8b4fafe3bc6b2caded79eda.app/Contents/Frameworks/WebCore.framework/Versions/A/WebCore:x86_64+0x30bc1c7) #9 0x6c0a33c9a in WebCore::jsDocumentPrototypeFunctionExecCommandBody(JSC::JSGlobalObject*, JSC::CallFrame*, WebCore::JSDocument*, JSC::ThrowScope&) (Safari_ASAN_251639_8651f88be7c86f1fa8b4fafe3bc6b2caded79eda.app/Contents/Frameworks/WebCore.framework/Versions/A/WebCore:x86_64+0xa31c9a) #10 0x6c08ec150 in long long WebCore::IDLOperation<WebCore::JSDocument>::call<&(WebCore::jsDocumentPrototypeFunctionExecCommandBody(JSC::JSGlobalObject*, JSC::CallFrame*, WebCore::JSDocument*, JSC::ThrowScope&)), (WebCore::CastedThisErrorBehavior)0>(JSC::JSGlobalObject&, JSC::CallFrame&, char const*) (Safari_ASAN_251639_8651f88be7c86f1fa8b4fafe3bc6b2caded79eda.app/Contents/Frameworks/WebCore.framework/Versions/A/WebCore:x86_64+0x8ea150) #11 0x3d778e40116a (<unknown module>) #12 0x6d9a7640c in llint_entry (Safari_ASAN_251639_8651f88be7c86f1fa8b4fafe3bc6b2caded79eda.app/Contents/Frameworks/JavaScriptCore.framework/Versions/A/JavaScriptCore:x86_64+0xa3d40c) #13 0x6d9a76298 in llint_entry (Safari_ASAN_251639_8651f88be7c86f1fa8b4fafe3bc6b2caded79eda.app/Contents/Frameworks/JavaScriptCore.framework/Versions/A/JavaScriptCore:x86_64+0xa3d298) #14 0x6d9a5f878 in vmEntryToJavaScript (Safari_ASAN_251639_8651f88be7c86f1fa8b4fafe3bc6b2caded79eda.app/Contents/Frameworks/JavaScriptCore.framework/Versions/A/JavaScriptCore:x86_64+0xa26878) #15 0x6db0140db in JSC::Interpreter::executeCall(JSC::JSGlobalObject*, JSC::JSObject*, JSC::CallType, JSC::CallData const&, JSC::JSValue, JSC::ArgList const&) (Safari_ASAN_251639_8651f88be7c86f1fa8b4fafe3bc6b2caded79eda.app/Contents/Frameworks/JavaScriptCore.framework/Versions/A/JavaScriptCore:x86_64+0x1fdb0db) #16 0x6db5d6fc0 in JSC::call(JSC::JSGlobalObject*, JSC::JSValue, JSC::CallType, JSC::CallData const&, JSC::JSValue, JSC::ArgList const&) (Safari_ASAN_251639_8651f88be7c86f1fa8b4fafe3bc6b2caded79eda.app/Contents/Frameworks/JavaScriptCore.framework/Versions/A/JavaScriptCore:x86_64+0x259dfc0) #17 0x6db5d70c1 in JSC::call(JSC::JSGlobalObject*, JSC::JSValue, JSC::CallType, JSC::CallData const&, JSC::JSValue, JSC::ArgList const&, WTF::NakedPtr<JSC::Exception>&) (Safari_ASAN_251639_8651f88be7c86f1fa8b4fafe3bc6b2caded79eda.app/Contents/Frameworks/JavaScriptCore.framework/Versions/A/JavaScriptCore:x86_64+0x259e0c1) #18 0x6db5d749f in JSC::profiledCall(JSC::JSGlobalObject*, JSC::ProfilingReason, JSC::JSValue, JSC::CallType, JSC::CallData const&, JSC::JSValue, JSC::ArgList const&, WTF::NakedPtr<JSC::Exception>&) (Safari_ASAN_251639_8651f88be7c86f1fa8b4fafe3bc6b2caded79eda.app/Contents/Frameworks/JavaScriptCore.framework/Versions/A/JavaScriptCore:x86_64+0x259e49f) #19 0x6c29c7174 in WebCore::JSExecState::profiledCall(JSC::JSGlobalObject*, JSC::ProfilingReason, JSC::JSValue, JSC::CallType, JSC::CallData const&, JSC::JSValue, JSC::ArgList const&, WTF::NakedPtr<JSC::Exception>&) (Safari_ASAN_251639_8651f88be7c86f1fa8b4fafe3bc6b2caded79eda.app/Contents/Frameworks/WebCore.framework/Versions/A/WebCore:x86_64+0x29c5174) #20 0x6c29ef55c in WebCore::JSEventListener::handleEvent(WebCore::ScriptExecutionContext&, WebCore::Event&) (Safari_ASAN_251639_8651f88be7c86f1fa8b4fafe3bc6b2caded79eda.app/Contents/Frameworks/WebCore.framework/Versions/A/WebCore:x86_64+0x29ed55c) #21 0x6c31cf524 in WebCore::EventTarget::innerInvokeEventListeners(WebCore::Event&, WTF::Vector<WTF::RefPtr<WebCore::RegisteredEventListener, WTF::DumbPtrTraits<WebCore::RegisteredEventListener> >, 1ul, WTF::CrashOnOverflow, 16ul>, WebCore::EventTarget::EventInvokePhase) (Safari_ASAN_251639_8651f88be7c86f1fa8b4fafe3bc6b2caded79eda.app/Contents/Frameworks/WebCore.framework/Versions/A/WebCore:x86_64+0x31cd524) #22 0x6c31ca7f7 in WebCore::EventTarget::fireEventListeners(WebCore::Event&, WebCore::EventTarget::EventInvokePhase) (Safari_ASAN_251639_8651f88be7c86f1fa8b4fafe3bc6b2caded79eda.app/Contents/Frameworks/WebCore.framework/Versions/A/WebCore:x86_64+0x31c87f7) #23 0x6c3f59e37 in WebCore::DOMWindow::dispatchEvent(WebCore::Event&, WebCore::EventTarget*) (Safari_ASAN_251639_8651f88be7c86f1fa8b4fafe3bc6b2caded79eda.app/Contents/Frameworks/WebCore.framework/Versions/A/WebCore:x86_64+0x3f57e37) #24 0x6c3f6c5cf in WebCore::DOMWindow::dispatchLoadEvent() (Safari_ASAN_251639_8651f88be7c86f1fa8b4fafe3bc6b2caded79eda.app/Contents/Frameworks/WebCore.framework/Versions/A/WebCore:x86_64+0x3f6a5cf) #25 0x6c30a603f in WebCore::Document::dispatchWindowLoadEvent() (Safari_ASAN_251639_8651f88be7c86f1fa8b4fafe3bc6b2caded79eda.app/Contents/Frameworks/WebCore.framework/Versions/A/WebCore:x86_64+0x30a403f) #26 0x6c30a59f0 in WebCore::Document::implicitClose() (Safari_ASAN_251639_8651f88be7c86f1fa8b4fafe3bc6b2caded79eda.app/Contents/Frameworks/WebCore.framework/Versions/A/WebCore:x86_64+0x30a39f0) #27 0x6c3d944fb in WebCore::FrameLoader::checkCompleted() (Safari_ASAN_251639_8651f88be7c86f1fa8b4fafe3bc6b2caded79eda.app/Contents/Frameworks/WebCore.framework/Versions/A/WebCore:x86_64+0x3d924fb) #28 0x6c308b978 in WebCore::Document::loadEventDelayTimerFired() (Safari_ASAN_251639_8651f88be7c86f1fa8b4fafe3bc6b2caded79eda.app/Contents/Frameworks/WebCore.framework/Versions/A/WebCore:x86_64+0x3089978) #29 0x6c3110d53 in std::__1::__bind_return<void (WebCore::Document::*)(), std::__1::tuple<WebCore::Document*>, std::__1::tuple<>, __is_valid_bind_return<void (WebCore::Document::*)(), std::__1::tuple<WebCore::Document*>, std::__1::tuple<> >::value>::type std::__1::__bind<void (WebCore::Document::*&)(), WebCore::Document*>::operator()<>() (Safari_ASAN_251639_8651f88be7c86f1fa8b4fafe3bc6b2caded79eda.app/Contents/Frameworks/WebCore.framework/Versions/A/WebCore:x86_64+0x310ed53) #30 0x6c42a0ff5 in WebCore::ThreadTimers::sharedTimerFiredInternal() (Safari_ASAN_251639_8651f88be7c86f1fa8b4fafe3bc6b2caded79eda.app/Contents/Frameworks/WebCore.framework/Versions/A/WebCore:x86_64+0x429eff5) 1622343 1 shihchieh_lee 2020-02-24 14:59:34 -0800 Root cause: In this case, hr is uneditable, and the script tries to insert an ol after hr, so the code is creating a BR element and inserting it after HR. However, since hr is uneditable, the insertion fails, making the BR element parentless. and that results in an null insertionPos, and it is later referenced in canHaveChildrenForEditing. <style> body { -webkit-user-modify: read-write; background-image: url(); } </style> <script> onload = function fun() { document.getSelection().setPosition(HR); HR.appendChild(document.createElement("option")); document.execCommand("insertOrderedList", false); } </script> <body><hr id=HR contenteditable="false"></hr> 1622359 2 shihchieh_lee 2020-02-24 15:21:42 -0800 In debug build, it would trigger two assertions: 1. CompositeEditCommand::insertNodeAt ASSERT(isEditablePosition(editingPosition)); 2. InsertNodeBeforeCommand::InsertNodeBeforeCommand ASSERT(m_refChild->parentNode()->hasEditableStyle() || !m_refChild->parentNode()->renderer()); 1622379 3 391591 shihchieh_lee 2020-02-24 16:02:46 -0800 Created attachment 391591 Patch 1622477 4 391591 rniwa 2020-02-24 19:02:05 -0800 Comment on attachment 391591 Patch View in context: https://bugs.webkit.org/attachment.cgi?id=391591&action=review > Source/WebCore/editing/InsertListCommand.cpp:341 > - if (start.isNull() || end.isNull()) > + if (start.isNull() || end.isNull() || !start.deepEquivalent().deprecatedNode()->hasEditableStyle()) Please check the eatability of start.deepEquivalent().containerNode() instead. 1622479 5 rniwa 2020-02-24 19:02:20 -0800 This is not a security bug. 1622635 6 shihchieh_lee 2020-02-25 09:04:41 -0800 Thanks! Yes, in this case the anchorType is PositionIsOffsetInAnchor, so container node is also m_anchorNode. (lldb) p anchorType() (WebCore::Position::AnchorType) $3 = PositionIsOffsetInAnchor (In reply to Ryosuke Niwa from comment #4) > Comment on attachment 391591 [details] > Patch > > View in context: > https://bugs.webkit.org/attachment.cgi?id=391591&action=review > > > Source/WebCore/editing/InsertListCommand.cpp:341 > > - if (start.isNull() || end.isNull()) > > + if (start.isNull() || end.isNull() || !start.deepEquivalent().deprecatedNode()->hasEditableStyle()) > > Please check the eatability of start.deepEquivalent().containerNode() > instead. 1622637 7 391660 shihchieh_lee 2020-02-25 09:06:09 -0800 Created attachment 391660 Patch 1622841 8 dougk 2020-02-25 17:04:52 -0800 Hey Jack, I just happened to notice unlistify can crash in much the same way -- does it make sense to apply the check at the level of doApply() instead? doApply() already has an early-abort for if content is not editable: if (endingSelection().isNoneOrOrphaned() || !endingSelection().isContentRichlyEditable()) return; 1622877 9 391660 rniwa 2020-02-25 18:02:49 -0800 Comment on attachment 391660 Patch View in context: https://bugs.webkit.org/attachment.cgi?id=391660&action=review > Source/WebCore/editing/InsertListCommand.cpp:341 > - if (start.isNull() || end.isNull()) > + if (start.isNull() || end.isNull() || !start.deepEquivalent().containerNode()->hasEditableStyle()) Sorry, I forgot to point out earlier but we should probably check that the end is also editable. 1622911 10 shihchieh_lee 2020-02-25 23:06:30 -0800 Thanks, Doug. It is possible. However, the actual inserting position is determined later in the call stack (depending on the tag and its children and some other properties) and can change in other cases, so it can be false positives if the code returns too early. In this test case, at doApply() the endingSelection has anchor type = PositionIsBeforeAnchor, so the editability is checked on the parent of anchor node, which is <body> hence it does not return here. When it enters listifyParagraph and after startOfParagraph is called, the anchor type becomes PositionIsOffsetInAnchor so the editability is checked on the anchor node, <hr>, which is uneditable. One experiment I did was removing the child (option) of the uneditable element (hr). Even though the anchor node is the uneditable element, the code does continue and inserts ol in front of hr. It sort of makes sense since if there is nothing to be "listified" inside <hr>, it is not considered "editing" <hr>? (In reply to Doug Kelly from comment #8) > Hey Jack, > > I just happened to notice unlistify can crash in much the same way -- does > it make sense to apply the check at the level of doApply() instead? > > doApply() already has an early-abort for if content is not editable: > > if (endingSelection().isNoneOrOrphaned() || > !endingSelection().isContentRichlyEditable()) > return; 1622914 11 shihchieh_lee 2020-02-25 23:29:07 -0800 Thanks! I thought about it but wondered if it is okay to listify contents if only the end is uneditable. Definitely it is more important to prevent crash! (In reply to Ryosuke Niwa from comment #9) > Comment on attachment 391660 [details] > Patch > > View in context: > https://bugs.webkit.org/attachment.cgi?id=391660&action=review > > > Source/WebCore/editing/InsertListCommand.cpp:341 > > - if (start.isNull() || end.isNull()) > > + if (start.isNull() || end.isNull() || !start.deepEquivalent().containerNode()->hasEditableStyle()) > > Sorry, I forgot to point out earlier but we should probably check that the > end is also editable. 1622916 12 391723 shihchieh_lee 2020-02-25 23:32:11 -0800 Created attachment 391723 Patch 1623285 13 391723 commit-queue 2020-02-26 17:01:42 -0800 Comment on attachment 391723 Patch Clearing flags on attachment: 391723 Committed r257536: <https://trac.webkit.org/changeset/257536> 1623286 14 commit-queue 2020-02-26 17:01:44 -0800 All reviewed patches have been landed. Closing bug. 1627437 15 rniwa 2020-03-07 19:59:40 -0800 *** Bug 208515 has been marked as a duplicate of this bug. *** 391591 2020-02-24 16:02:46 -0800 2020-02-25 09:06:07 -0800 Patch bug-208115-20200224160245.patch text/plain 4201 shihchieh_lee U3VidmVyc2lvbiBSZXZpc2lvbjogMjUzMjAzCmRpZmYgLS1naXQgYS9Tb3VyY2UvV2ViQ29yZS9D aGFuZ2VMb2cgYi9Tb3VyY2UvV2ViQ29yZS9DaGFuZ2VMb2cKaW5kZXggYjFmY2M2NTllMmQ3YzJl ZGIyZmYwZjYyZDIxNzFhNjdiOTdkNjFjNi4uMTU4MjU4ZjY0MGU4MzlhNzhkZGU4OGZhZjg0YzE0 NDYxZWVhMDNlMSAxMDA2NDQKLS0tIGEvU291cmNlL1dlYkNvcmUvQ2hhbmdlTG9nCisrKyBiL1Nv dXJjZS9XZWJDb3JlL0NoYW5nZUxvZwpAQCAtMSwzICsxLDE4IEBACisyMDIwLTAyLTI0ICBKYWNr IExlZSAgPHNoaWhjaGllaF9sZWVAYXBwbGUuY29tPgorCisgICAgICAgIE51bGxwdHIgY3Jhc2gg aW4gV2ViQ29yZTo6Y2FuSGF2ZUNoaWxkcmVuRm9yRWRpdGluZyB2aWEgQ29tcG9zaXRlRWRpdENv bW1hbmQ6Omluc2VydE5vZGUKKyAgICAgICAgaHR0cHM6Ly9idWdzLndlYmtpdC5vcmcvc2hvd19i dWcuY2dpP2lkPTIwODExNQorICAgICAgICA8cmRhcjovL3Byb2JsZW0vNTY2ODU2NTU+CisKKyAg 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