210016 2020-04-04 21:52:27 -0700 Nullptr crash in WebCore::lastPositionInNode when indenting text node that has user-select:all parent. 2020-04-06 18:46:01 -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 ews-watchlist mifenton product-security rniwa webkit-bug-importer wenson_hsieh oldest_to_newest 1637807 0 shihchieh_lee 2020-04-04 21:52:27 -0700 <rdar://61014577> #0 0x3b81dea51 in WebCore::Node::getFlag(WebCore::Node::NodeFlags) const (Safari_ASAN_259163_6d5fb2d39898a6352d12792f8e6477a2373020ec.app/Contents/Frameworks/WebCore.framework/Versions/A/WebCore:x86_64+0x1dca51) #1 0x3ba9fa7f4 in WebCore::lastPositionInNode(WebCore::Node*) (Safari_ASAN_259163_6d5fb2d39898a6352d12792f8e6477a2373020ec.app/Contents/Frameworks/WebCore.framework/Versions/A/WebCore:x86_64+0x29f87f4) #2 0x3bb4f1edb in WebCore::ApplyBlockElementCommand::rangeForParagraphSplittingTextNodesIfNeeded(WebCore::VisiblePosition const&, WebCore::Position&, WebCore::Position&) (Safari_ASAN_259163_6d5fb2d39898a6352d12792f8e6477a2373020ec.app/Contents/Frameworks/WebCore.framework/Versions/A/WebCore:x86_64+0x34efedb) #3 0x3bb4f0a3e in WebCore::ApplyBlockElementCommand::formatSelection(WebCore::VisiblePosition const&, WebCore::VisiblePosition const&) (Safari_ASAN_259163_6d5fb2d39898a6352d12792f8e6477a2373020ec.app/Contents/Frameworks/WebCore.framework/Versions/A/WebCore:x86_64+0x34eea3e) #4 0x3bb4efe83 in WebCore::ApplyBlockElementCommand::doApply() (Safari_ASAN_259163_6d5fb2d39898a6352d12792f8e6477a2373020ec.app/Contents/Frameworks/WebCore.framework/Versions/A/WebCore:x86_64+0x34ede83) #5 0x3bb4eeba6 in WebCore::CompositeEditCommand::apply() (Safari_ASAN_259163_6d5fb2d39898a6352d12792f8e6477a2373020ec.app/Contents/Frameworks/WebCore.framework/Versions/A/WebCore:x86_64+0x34ecba6) #6 0x3bb5a4278 in WebCore::executeIndent(WebCore::Frame&, WebCore::Event*, WebCore::EditorCommandSource, WTF::String const&) (Safari_ASAN_259163_6d5fb2d39898a6352d12792f8e6477a2373020ec.app/Contents/Frameworks/WebCore.framework/Versions/A/WebCore:x86_64+0x35a2278) #7 0x3bb21f127 in WebCore::Document::execCommand(WTF::String const&, bool, WTF::String const&) 1637808 1 shihchieh_lee 2020-04-04 21:52:55 -0700 Root cause: In function rangeForParagraphSplittingTextNodesIfNeeded, the attemt to split text node fails, so there is no sibling node being created. However, the code assumes sibling exists and deref it in lastPositionInNode(). 1. In this test, formatSelection is called to indent all the elements and nodes in <body>. 2. To determine which paragraph to indent, fuction RangeForParagraphSplittingTextNodesIfNeeded is called. 3. For text node in pre element, because there is newline in it, fucntion splitTextNode is called to create a new text node for “\n”. 4. However, since <details> and <pre> has use-select set to all, which is considered uneditable, splitTextNode returns without creating a sibling text node. 5. Next we call functions firstPositionInOrBeforeNode and lastPositionInNode with the null sibling node and crashes. <style> #DETAILS { -webkit-user-select: all; } </style> <script> window.onload = () => { document.execCommand("selectAll", false); document.execCommand("indent", false); } </script> <body contentEditable="true"><br></br><details id=DETAILS open="true"><pre>a </pre></details><span>a</span> Node tree before indentation: BODY 0x60c0000814c0 (renderer 0x612000061cc0) BR 0x60c000081580 (renderer 0x6110000c2f00) BR 0x60c000081640 (renderer 0x6110000c3040) DETAILS 0x60e00005ce00 (renderer 0x612000061e40) #document-fragment 0x61200005a7c0 (renderer 0x0) (needs style recalc) (child needs style recalc) SLOT 0x60d000063e70 (renderer 0x0) SUMMARY 0x60c0000817c0 (renderer 0x612000062140) #document-fragment 0x61200005a940 (renderer 0x0) (needs style recalc) (child needs style recalc) DIV 0x60c000081880 (renderer 0x6120000622c0) SLOT 0x60d000063f40 (renderer 0x0) #text 0x60800004d220 "Details" SLOT 0x60d000064280 (renderer 0x0) PRE 0x60c000081b80 (renderer 0x612000062440) #text 0x60800004d2a0 "a\n" SPAN 0x60c000081c40 (renderer 0x6110000c3180) * #text 0x60800004d320 "a" #text 0x60800004d3a0 "\n" legacy, offset, offset:1 1637809 2 395480 shihchieh_lee 2020-04-04 22:06:21 -0700 Created attachment 395480 Patch 1637810 3 395481 shihchieh_lee 2020-04-04 22:08:04 -0700 Created attachment 395481 Patch 1638240 4 395481 rniwa 2020-04-06 12:31:17 -0700 Comment on attachment 395481 Patch View in context: https://bugs.webkit.org/attachment.cgi?id=395481&action=review > Source/WebCore/editing/ApplyBlockElementCommand.cpp:247 > + if (endContainer->previousSibling()) { We prefer early exit over nested if's so this should check for endContainer not having the previous sibling. Also, we should probably check that the previous sibling is a text node. > Source/WebCore/editing/ApplyBlockElementCommand.cpp:258 > + start = end = { }; Nit: Each statement should have its own line so should be: start = { }; end = { }; 1638241 5 rniwa 2020-04-06 12:31:33 -0700 There is no security implication here. 1638259 6 395604 shihchieh_lee 2020-04-06 13:03:21 -0700 Created attachment 395604 Patch 1638412 7 ews-feeder 2020-04-06 18:46:01 -0700 Committed r259619: <https://trac.webkit.org/changeset/259619> All reviewed patches have been landed. Closing bug and clearing flags on attachment 395604. 395480 2020-04-04 22:06:21 -0700 2020-04-04 22:08:03 -0700 Patch bug-210016-20200404220620.patch text/plain 6423 shihchieh_lee U3VidmVyc2lvbiBSZXZpc2lvbjogMjU5NDM5CmRpZmYgLS1naXQgYS9Tb3VyY2UvV2ViQ29yZS9D aGFuZ2VMb2cgYi9Tb3VyY2UvV2ViQ29yZS9DaGFuZ2VMb2cKaW5kZXggYjE1YTUzZTUzYjFjMzE1 Y2FhNjc2Y2M3ZTA3YmIxZDA5MGNkYWM4OC4uM2NhYzY1YTI1ZjFiN2I5Mjc0YWIxYjM1OTUyYmIy MWE2M2ZlZTQ5MSAxMDA2NDQKLS0tIGEvU291cmNlL1dlYkNvcmUvQ2hhbmdlTG9nCisrKyBiL1Nv dXJjZS9XZWJDb3JlL0NoYW5nZUxvZwpAQCAtMSwzICsxLDIzIEBACisyMDIwLTA0LTA0ICBKYWNr IExlZSAgPHNoaWhjaGllaF9sZWVAYXBwbGUuY29tPgorCisgICAgICAgIE51bGxwdHIgY3Jhc2gg aW4gV2ViQ29yZTo6bGFzdFBvc2l0aW9uSW5Ob2RlIHdoZW4gaW5kZW50aW5nIHRleHQgbm9kZSB0 aGF0IGhhcyB1c2VyLXNlbGVjdDphbGwgcGFyZW50LgorICAgICAgICBodHRwczovL2J1Z3Mud2Vi a2l0Lm9yZy9zaG93X2J1Zy5jZ2k/aWQ9MjEwMDE2CisgICAgICAgIDxyZGFyOi8vcHJvYmxlbS82 MTAxNDU3Nz4KKworICAgICAgICBSZXZpZXdlZCBieSBOT0JPRFkgKE9PUFMhKS4KKworICAgICAg 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