209641 2020-03-26 21:10:11 -0700 Nullptr crash in CompositeEditCommand::moveParagraphs when inserting OL into uneditable parent. 2020-03-27 21:17:06 -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 1634725 0 shihchieh_lee 2020-03-26 21:10:11 -0700 <rdar://60915598> 0 com.apple.WebCore 0x0000000113bfdf6d WTF::Optional<WebCore::BoundaryPoint>::operator*() && + 45 1 com.apple.WebCore 0x00000001162fb268 WebCore::CompositeEditCommand::moveParagraphs(WebCore::VisiblePosition const&, WebCore::VisiblePosition const&, WebCore::VisiblePosition const&, bool, bool) + 4616 2 com.apple.WebCore 0x00000001163a7fc4 WebCore::InsertListCommand::unlistifyParagraph(WebCore::VisiblePosition const&, WebCore::HTMLElement*, WebCore::Node*) + 1860 3 com.apple.WebCore 0x00000001163a73e1 WebCore::InsertListCommand::doApplyForSingleParagraph(bool, WebCore::HTMLQualifiedName const&, WebCore::Range*) + 2977 4 com.apple.WebCore 0x00000001163a6510 WebCore::InsertListCommand::doApply() + 2624 5 com.apple.WebCore 0x00000001162d7957 WebCore::CompositeEditCommand::apply() + 439 6 com.apple.WebCore 0x000000011638dd19 WebCore::executeInsertOrderedList(WebCore::Frame&, WebCore::Event*, WebCore::EditorCommandSource, WTF::String const&) + 201 7 com.apple.WebCore 0x0000000116007e88 WebCore::Document::execCommand(WTF::String const&, bool, WTF::String const&) + 248 1634729 1 shihchieh_lee 2020-03-26 21:23:08 -0700 In this case we try to insert ol at the position of li. Because li is originally in un-ordered list, we call unlistifyParagraph to move li into a BR element. Since BR needs to be inserted in body, but body is not editable, the insertion fails and leave BR parentless. The next call in moveParagraphs deref the parent of BR and crashed. </style> <script> window.onload = () => { document.getSelection().setPosition(LI); document.execCommand("insertOrderedList", false); } </script> <body><ul><li id=LI contenteditable="true"> 1634734 2 394702 shihchieh_lee 2020-03-26 21:44:45 -0700 Created attachment 394702 Patch 1634736 3 shihchieh_lee 2020-03-26 21:56:11 -0700 This is a conservative patch. We are checking parentless node after insertion. In debug build, a lot of assertions for editable content trigger before and during insertion. I was wondering if checking parent of container node of the visible position for edibility is okay? Is it too aggressive and may find false positive? I roughly checked all the insertion calls and each of them eventually checks parent or ancestor for editability. Something like this: if (!start.deepEquivalent().containerNode()->hasEditableStyle() || !start.deepEquivalent().containerNode()->parentNode()->hasEditableStyle()) return; 1634739 4 rniwa 2020-03-26 22:06:28 -0700 (In reply to Jack from comment #3) > This is a conservative patch. We are checking parentless node after > insertion. In debug build, a lot of assertions for editable content trigger > before and during insertion. Hm... we probably need to fix that because we can't land a test which hits assertions in debug builds. > I was wondering if checking parent of container node of the visible position > for edibility is okay? Is it too aggressive and may find false positive? I > roughly checked all the insertion calls and each of them eventually checks > parent or ancestor for editability. > > Something like this: > > if (!start.deepEquivalent().containerNode()->hasEditableStyle() || > !start.deepEquivalent().containerNode()->parentNode()->hasEditableStyle()) > return; At where? That doesn't seem right if container node itself is editable. Why does the parent of the container node needs to be also editable? 1634740 5 shihchieh_lee 2020-03-26 22:12:54 -0700 (In reply to Ryosuke Niwa from comment #4) > (In reply to Jack from comment #3) > > This is a conservative patch. We are checking parentless node after > > insertion. In debug build, a lot of assertions for editable content trigger > > before and during insertion. > > Hm... we probably need to fix that because we can't land a test which hits > assertions in debug builds. I see. > > if (!start.deepEquivalent().containerNode()->hasEditableStyle() || > > !start.deepEquivalent().containerNode()->parentNode()->hasEditableStyle()) > > return; > > At where? That doesn't seem right if container node itself is editable. Why > does the parent of the container node needs to be also editable? In the beginning of the function. It's because the function insertNodeAfter or insertNodeBefore eventually append or insert to the parent, for example: void CompositeEditCommand::insertNodeAfter(Ref<Node>&& insertChild, Node& refChild) { ContainerNode* parent = refChild.parentNode(); ... if (parent->lastChild() == &refChild) appendNode(WTFMove(insertChild), *parent); } 1634742 6 shihchieh_lee 2020-03-26 22:17:21 -0700 And InsertNodeBefore also checks parent for editability. void InsertNodeBeforeCommand::doApply() { ContainerNode* parent = m_refChild->parentNode(); if (!parent || (m_shouldAssumeContentIsAlwaysEditable == DoNotAssumeContentIsAlwaysEditable && !isEditableNode(*parent))) return; ASSERT(isEditableNode(*parent)); parent->insertBefore(m_insertChild, m_refChild.ptr()); } 1634743 7 rniwa 2020-03-26 22:20:59 -0700 (In reply to Jack from comment #5) > (In reply to Ryosuke Niwa from comment #4) > > (In reply to Jack from comment #3) > > > This is a conservative patch. We are checking parentless node after > > > insertion. In debug build, a lot of assertions for editable content trigger > > > before and during insertion. > > > > Hm... we probably need to fix that because we can't land a test which hits > > assertions in debug builds. > I see. > > > > if (!start.deepEquivalent().containerNode()->hasEditableStyle() || > > > !start.deepEquivalent().containerNode()->parentNode()->hasEditableStyle()) > > > return; > > > > At where? That doesn't seem right if container node itself is editable. Why > > does the parent of the container node needs to be also editable? > In the beginning of the function. The beginning of which function? InsertListCommand::unlistifyParagraph? > It's because the function insertNodeAfter or insertNodeBefore eventually > append or insert to the parent, for example: In which function? It's unclear what code of which function you're talking about. 1634744 8 shihchieh_lee 2020-03-26 22:24:31 -0700 > In which function? It's unclear what code of which function you're talking > about. Oh sorry, the changes are in unlistifyParagraph and listifyParagraph. 1634748 9 394706 shihchieh_lee 2020-03-26 23:09:28 -0700 Created attachment 394706 Patch 1634749 10 shihchieh_lee 2020-03-26 23:13:32 -0700 Thanks to Ryosuke for discussion. We use more aggressive editability check in unlistifyParagraph because the insertion position is always the listNode. Try this patch on EWS tests. (In reply to Jack from comment #9) > Created attachment 394706 [details] > Patch 1634758 11 394706 rniwa 2020-03-26 23:58:51 -0700 Comment on attachment 394706 Patch View in context: https://bugs.webkit.org/attachment.cgi?id=394706&action=review > Source/WebCore/editing/InsertListCommand.cpp:277 > + Nit: whitespace. > Source/WebCore/editing/InsertListCommand.cpp:280 > + Nit: whitespace. > Source/WebCore/editing/InsertListCommand.cpp:398 > + Nit: whitespace. > LayoutTests/editing/inserting/insert-ol-uneditable-parent.html:1 > +</style> Do we really need this? 1634759 12 rniwa 2020-03-26 23:59:59 -0700 There is no security implication here. 1634865 13 394728 shihchieh_lee 2020-03-27 10:36:16 -0700 Created attachment 394728 Patch for landing 1634866 14 shihchieh_lee 2020-03-27 10:38:12 -0700 Thanks for the good catches! It's in the original test case, somehow my eyes automatically skip that... :-) (In reply to Ryosuke Niwa from comment #11) > Comment on attachment 394706 [details] 1635120 15 ews-feeder 2020-03-27 21:17:05 -0700 Committed r259153: <https://trac.webkit.org/changeset/259153> All reviewed patches have been landed. Closing bug and clearing flags on attachment 394728. 394702 2020-03-26 21:44:45 -0700 2020-03-26 22:37:32 -0700 Patch bug-209641-20200326214444.patch text/plain 4618 shihchieh_lee U3VidmVyc2lvbiBSZXZpc2lvbjogMjU4ODkwCmRpZmYgLS1naXQgYS9Tb3VyY2UvV2ViQ29yZS9D aGFuZ2VMb2cgYi9Tb3VyY2UvV2ViQ29yZS9DaGFuZ2VMb2cKaW5kZXggOTE5ZmJjOTMyM2JmOTVj NzAxNzBmZmZmODdkNTU1MjNjOGU0YjIwYS4uZWFjOWYxYTVlOGE1NjEyNGY2YzZkM2QzZmJlZjdl NWEyODgwZTVhNyAxMDA2NDQKLS0tIGEvU291cmNlL1dlYkNvcmUvQ2hhbmdlTG9nCisrKyBiL1Nv dXJjZS9XZWJDb3JlL0NoYW5nZUxvZwpAQCAtMSwzICsxLDIxIEBACisyMDIwLTAzLTI2ICBKYWNr IExlZSAgPHNoaWhjaGllaF9sZWVAYXBwbGUuY29tPgorCisgICAgICAgIE51bGxwdHIgY3Jhc2gg aW4gQ29tcG9zaXRlRWRpdENvbW1hbmQ6Om1vdmVQYXJhZ3JhcGhzIHdoZW4gaW5zZXJ0aW5nIE9M IGludG8gdW5lZGl0YWJsZSBwYXJlbnQuCisgICAgICAgIGh0dHBzOi8vYnVncy53ZWJraXQub3Jn L3Nob3dfYnVnLmNnaT9pZD0yMDk2NDEKKyAgICAgICAgPHJkYXI6Ly9wcm9ibGVtLzYwOTE1NTk4 PgorCisgICAgICAgIFJldmlld2VkIGJ5IE5PQk9EWSAoT09QUyEpLgorCisgICAgICAgIEluc2Vy 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