209999 2020-04-03 21:54:10 -0700 Nullptr crash in CompositeEditCommand::moveParagraphContentsToNewBlockIfNecessary with draggable text 2020-04-06 14:44:16 -0700 1 1 1 Unclassified WebKit HTML Editing WebKit Nightly Build All All RESOLVED FIXED InRadar P2 Normal --- 1 shihchieh_lee shihchieh_lee bfulgham ews-feeder product-security rniwa webkit-bug-importer wenson_hsieh oldest_to_newest 1637626 0 shihchieh_lee 2020-04-03 21:54:10 -0700 <rdar://58978340> ==22496==ERROR: AddressSanitizer: SEGV on unknown address 0x000000000014 (pc 0x00072bba7ae2 bp 0x7ffee215fd50 sp 0x7ffee215fd50 T0) ==22496==The signal is caused by a READ memory access. ==22496==Hint: address points to the zero page. ==22496==WARNING: invalid path to external symbolizer! ==22496==WARNING: Failed to use and restart external symbolizer! #0 0x72bba7ae1 in WebCore::Node::getFlag(WebCore::Node::NodeFlags) const (Safari_ASAN_254346_4878c59d1007965234bf2fabf087ce373bfe4e27.app/Contents/Frameworks/WebCore.framework/Versions/A/WebCore:x86_64+0x1afae1) #1 0x72bba79d1 in WebCore::Node::hasTagName(WebCore::HTMLQualifiedName const&) const (Safari_ASAN_254346_4878c59d1007965234bf2fabf087ce373bfe4e27.app/Contents/Frameworks/WebCore.framework/Versions/A/WebCore:x86_64+0x1af9d1) #2 0x72edcc895 in WebCore::CompositeEditCommand::moveParagraphContentsToNewBlockIfNecessary(WebCore::Position const&) (Safari_ASAN_254346_4878c59d1007965234bf2fabf087ce373bfe4e27.app/Contents/Frameworks/WebCore.framework/Versions/A/WebCore:x86_64+0x33d4895) #3 0x72edc96d7 in WebCore::ApplyStyleCommand::applyBlockStyle(WebCore::EditingStyle&) (Safari_ASAN_254346_4878c59d1007965234bf2fabf087ce373bfe4e27.app/Contents/Frameworks/WebCore.framework/Versions/A/WebCore:x86_64+0x33d16d7) #4 0x72edc8c52 in WebCore::ApplyStyleCommand::doApply() (Safari_ASAN_254346_4878c59d1007965234bf2fabf087ce373bfe4e27.app/Contents/Frameworks/WebCore.framework/Versions/A/WebCore:x86_64+0x33d0c52) #5 0x72edbfb36 in WebCore::CompositeEditCommand::apply() (Safari_ASAN_254346_4878c59d1007965234bf2fabf087ce373bfe4e27.app/Contents/Frameworks/WebCore.framework/Versions/A/WebCore:x86_64+0x33c7b36) #6 0x72ee33467 in WebCore::Editor::applyParagraphStyle(WebCore::StyleProperties*, WebCore::EditAction) (Safari_ASAN_254346_4878c59d1007965234bf2fabf087ce373bfe4e27.app/Contents/Frameworks/WebCore.framework/Versions/A/WebCore:x86_64+0x343b467) #7 0x72ee7bbf6 in WebCore::executeApplyParagraphStyle(WebCore::Frame&, WebCore::EditorCommandSource, WebCore::EditAction, WebCore::CSSPropertyID, WTF::String const&) (Safari_ASAN_254346_4878c59d1007965234bf2fabf087ce373bfe4e27.app/Contents/Frameworks/WebCore.framework/Versions/A/WebCore:x86_64+0x3483bf6) #8 0x72ee74692 in WebCore::executeJustifyCenter(WebCore::Frame&, WebCore::Event*, WebCore::EditorCommandSource, WTF::String const&) (Safari_ASAN_254346_4878c59d1007965234bf2fabf087ce373bfe4e27.app/Contents/Frameworks/WebCore.framework/Versions/A/WebCore:x86_64+0x347c692) #9 0x72eaf63d7 in WebCore::Document::execCommand(WTF::String const&, bool, WTF::String const&) (Safari_ASAN_254346_4878c59d1007965234bf2fabf087ce373bfe4e27.app/Contents/Frameworks/WebCore.framework/Versions/A/WebCore:x86_64+0x30fe3d7) #10 0x72c4671ba in WebCore::jsDocumentPrototypeFunctionExecCommandBody(JSC::JSGlobalObject*, JSC::CallFrame*, WebCore::JSDocument*, JSC::ThrowScope&) (Safari_ASAN_254346_4878c59d1007965234bf2fabf087ce373bfe4e27.app/Contents/Frameworks/WebCore.framework/Versions/A/WebCore:x86_64+0xa6f1ba) 1637628 1 webkit-bug-importer 2020-04-03 21:54:17 -0700 <rdar://problem/61288781> 1637631 2 shihchieh_lee 2020-04-03 21:59:10 -0700 Root cause: In function moveParagraphContentsToNewBlockIfNecessary, an empty VisiblePosition is derefed for its anchor node. 1. Because span has attribute “draggable” set to true, its “UserSelect” style is set to none. 2. When “justifyCenter” command executes on the shadow element, we try to move the whole paragraph to a new block by calling moveParagraphContentsToNewBlockIfNecessary. 3. In moveParagraphContentsToNewBlockIfNecessary, we find the end of the paragraph by calling endOfParagraph. 4. However, endOfParagraph returns empty visible position because function canonicalPosition cannot find a candidate position. 5. The text node is supposed to be the end of the paragraph, but its parent, <span>, has UserSelect::None style, so it is not selected by canonicalPosition(). 6. Later the empty endOfParagraph is deref for its null anchor node, and the code crashes. <style> #SHADOW { initial; -webkit-user-select: text; } #LABEL { -webkit-user-select: all; } </style> <script> window.onload = () => { window.getSelection().collapse(SHADOW); document.execCommand("justifyCenter", false); } </script> <label id=LABEL contenteditable="true"><shadow id=SHADOW></shadow><span draggable="true">a BODY 0x60c000086e00 (renderer 0x612000071140) LABEL 0x60c000086ec0 (renderer 0x6110000d1f00) SHADOW 0x60c000086f80 (renderer 0x6110000d2040) SPAN 0x60c000087040 (renderer 0x6110000d2180) * #text 0x6080000501a0 "a\n" 1637632 3 shihchieh_lee 2020-04-03 22:00:22 -0700 Please refer to <rdar://58978340>. (In reply to Radar WebKit Bug Importer from comment #1) > <rdar://problem/61288781> This was caused by accidental save of the bug. 1637646 4 395437 shihchieh_lee 2020-04-03 22:29:15 -0700 Created attachment 395437 Patch 1638247 5 395437 rniwa 2020-04-06 12:43:30 -0700 Comment on attachment 395437 Patch View in context: https://bugs.webkit.org/attachment.cgi?id=395437&action=review > Source/WebCore/editing/CompositeEditCommand.cpp:1184 > + Nit: whitespace. 1638248 6 rniwa 2020-04-06 12:43:47 -0700 There is no security implication here. 1638251 7 395602 shihchieh_lee 2020-04-06 12:50:05 -0700 Created attachment 395602 Patch for landing 1638324 8 ews-feeder 2020-04-06 14:44:16 -0700 Committed r259595: <https://trac.webkit.org/changeset/259595> All reviewed patches have been landed. Closing bug and clearing flags on attachment 395602. 395437 2020-04-03 22:29:15 -0700 2020-04-06 12:50:04 -0700 Patch bug-209999-20200403222915.patch text/plain 4079 shihchieh_lee U3VidmVyc2lvbiBSZXZpc2lvbjogMjU5NDM5CmRpZmYgLS1naXQgYS9Tb3VyY2UvV2ViQ29yZS9D aGFuZ2VMb2cgYi9Tb3VyY2UvV2ViQ29yZS9DaGFuZ2VMb2cKaW5kZXggYjE1YTUzZTUzYjFjMzE1 Y2FhNjc2Y2M3ZTA3YmIxZDA5MGNkYWM4OC4uNzFkODI4NzQ5NWQ2YjA3ODhhZDY4N2NjZThlYjM5 OGFkMTlhOWZiOSAxMDA2NDQKLS0tIGEvU291cmNlL1dlYkNvcmUvQ2hhbmdlTG9nCisrKyBiL1Nv dXJjZS9XZWJDb3JlL0NoYW5nZUxvZwpAQCAtMSwzICsxLDE5IEBACisyMDIwLTA0LTAzICBKYWNr IExlZSAgPHNoaWhjaGllaF9sZWVAYXBwbGUuY29tPgorCisgICAgICAgIE51bGxwdHIgY3Jhc2gg aW4gQ29tcG9zaXRlRWRpdENvbW1hbmQ6Om1vdmVQYXJhZ3JhcGhDb250ZW50c1RvTmV3QmxvY2tJ Zk5lY2Vzc2FyeSB3aXRoIGRyYWdnYWJsZSB0ZXh0CisgICAgICAgIGh0dHBzOi8vYnVncy53ZWJr aXQub3JnL3Nob3dfYnVnLmNnaT9pZD0yMDk5OTkKKyAgICAgICAgPHJkYXI6Ly9wcm9ibGVtLzU4 OTc4MzQwPgorCisgICAgICAgIFJldmlld2VkIGJ5IE5PQk9EWSAoT09QUyEpLgorCisgICAgICAg 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