48768 2010-11-01 11:18:16 -0700 Transferred <iframe>s may not have a unique internal name 2010-11-12 22:47:04 -0800 1 1 1 Unclassified WebKit WebCore Misc. 528+ (Nightly build) All All RESOLVED FIXED P2 Normal --- 6751 49489 1 dbates dbates abarth ap dimich fishd hausmann jennb levin oldest_to_newest 302795 0 dbates 2010-11-01 11:18:16 -0700 <iframe>s that are transferred from document A to document B, where A != B, may not have a unique internal name in B. 302820 1 72534 dbates 2010-11-01 11:49:34 -0700 Created attachment 72534 Example This example uses a known side effect of bug #6751. That is, we can get the internal WebKit frame name of a frame via its contentWindow.name property. Assuming that each frame in a document has a unique internal name. Using this example we can demonstrate that two <iframe>s in the same document can have the same internal name. Let A be the frame in document D_0 that contains a frame F_1 whose name is "Frame1" and whose content is "Frame1". Notice, F_1 is in the document of A, call it D_A. When you run the example, a frame F_2 in document D_0 whose name is "Frame1" and whose content is "Frame2" is adopted by A such that A has two <iframe>s, F_1 and F_2; => F_1 and F_2 are in D_A. But the name of F_2 == "Frame1" == name of F_1 (contradicts names uniqueness). 302822 2 dbates 2010-11-01 11:52:41 -0700 To run the example, download it locally. Then open it in Safari. 303686 3 72739 jennb 2010-11-02 14:46:40 -0700 Created attachment 72739 update internal frame name on reparenting In Frame.cpp, the line above my change that calls m_ownerElement->setName() will no longer be needed once bug 6751 is fixed as that frame name will not need to be updated for uniqueness upon reparenting. Example test case added as layout test in this patch. 303695 4 72739 dbates 2010-11-02 14:53:47 -0700 Comment on attachment 72739 update internal frame name on reparenting View in context: https://bugs.webkit.org/attachment.cgi?id=72739&action=review I have a work in progress patch for this issue and was planned to address it after I land bug #6751. > WebCore/page/Frame.cpp:738 > + tree()->setName(tree()->name()); Because of <https://bugs.webkit.org/show_bug.cgi?id=48806#c0> we can't call setName() after appendChild() since the child count will be off. Disregarding the frame prefix, notice in your results the unique name has <!--frame2-->, but we count from zero, so this should be <!--frame1-->. 303697 5 72743 dbates 2010-11-02 14:56:57 -0700 Created attachment 72743 [Patch] Work-in-progress Work in progress patch. 304414 6 72896 dbates 2010-11-03 18:59:14 -0700 Created attachment 72896 Patch with layout test I thought to move the child transfer code from Frame::transferChildFrameToNewDocument() to FrameTree::transferChild() so that we can set ensure that the name of the transferred frame has a unique name with respect to its new parent. I am open to suggestions on the name of this function and its return type as well as the approach of this patch. 304451 7 72901 dbates 2010-11-03 20:19:58 -0700 Created attachment 72901 Patch with layout test Updated patch that removes the methods HTMLFrameElementBase::setName() and HTMLFrameOwnerElement::setName(). Also, re-worded description in layout test to imply that this test only works in DRT. 304901 8 72901 abarth 2010-11-04 15:05:36 -0700 Comment on attachment 72901 Patch with layout test View in context: https://bugs.webkit.org/attachment.cgi?id=72901&action=review > WebCore/page/FrameTree.cpp:75 > + ASSERT(child->page() == m_thisFrame->page()); Why is this true? You can't transfer frames between pages? 304909 9 dimich 2010-11-04 15:12:56 -0700 It probably would be good to split FrameTree::setName() into setName() and updateUniqueName(), since it is a mechanical combination of two and apparently those two are not always to be called in a lockstep. For example, various 'createChildFrame' methods in WebKit layer typically have a new frame name, so they call setName() before appendChild(). With this patch, we'll call setName() again inside appendChild, passing the same name to itself. For example, WebKit/mac/WebView/WebFrame.mm, _createFrameWithPage. Instead, we could call setName() in createFrameWithPage and friends, and simply updateUniqueName() from appendChild. It might make code clearer. 304923 10 dbates 2010-11-04 15:26:09 -0700 (In reply to comment #8) > (From update of attachment 72901 [details]) > View in context: https://bugs.webkit.org/attachment.cgi?id=72901&action=review > > > WebCore/page/FrameTree.cpp:75 > > + ASSERT(child->page() == m_thisFrame->page()); > > Why is this true? You can't transfer frames between pages? I will look into this further and respond shortly. 304932 11 dbates 2010-11-04 15:38:52 -0700 (In reply to comment #9) > It probably would be good to split FrameTree::setName() into setName() and updateUniqueName(), since it is a mechanical combination of two and apparently those two are not always to be called in a lockstep. > > For example, various 'createChildFrame' methods in WebKit layer typically have a new frame name, so they call setName() before appendChild(). With this patch, we'll call setName() again inside appendChild, passing the same name to itself. For example, WebKit/mac/WebView/WebFrame.mm, _createFrameWithPage. > Notice, neither FrameTree::appendChild() nor FrameTree::actuallyAppendChild() (added in this patch) calls FrameTree::setName(). And Frame::transferChildFrameToNewDocument() is the only call site that needs to have the child's unique name updated (since we are transferring it to a new parent, which may already contain a frame with an identical name). > Instead, we could call setName() in createFrameWithPage and friends, and simply updateUniqueName() from appendChild. It might make code clearer. As aforementioned, appendChild() does not update the unique name. We could factor our the unique name updating from FrameTree::setName(), but we don't always have to update the unique frame name so I'm unclear of the benefit given the current call sites of FrameTree::setName(). 304983 12 dimich 2010-11-04 16:22:50 -0700 > As aforementioned, appendChild() does not update the unique name. We could factor our the unique name updating from FrameTree::setName(), but we don't always have to update the unique frame name so I'm unclear of the benefit given the current call sites of FrameTree::setName(). That's right, sorry I was not clear.. What I should have said was we could split those, perhaps call it generateUniqueName() rather, and only call it inside appendChild(), before incrementing the child counter, since it seems this is the only place that effectively establishes the computed unique name (other then case which where there is no parent). Then there is no need for actuallyAppendChild(), and transferChild(), can simply call appendChild() to set parent, update name and do the rest of appending, if I don't miss something... 304997 13 dbates 2010-11-04 16:40:39 -0700 (In reply to comment #12) > > As aforementioned, appendChild() does not update the unique name. We could factor our the unique name updating from FrameTree::setName(), but we don't always have to update the unique frame name so I'm unclear of the benefit given the current call sites of FrameTree::setName(). > > That's right, sorry I was not clear.. What I should have said was we could split those, perhaps call it generateUniqueName() rather, and only call it inside appendChild(), before incrementing the child counter, since it seems this is the only place that effectively establishes the computed unique name (other then case which where there is no parent). > > Then there is no need for actuallyAppendChild(), and transferChild(), can simply call appendChild() to set parent, update name and do the rest of appending, if I don't miss something... Notice, FrameTree::uniqueChildName() calls FrameTree::child() <http://trac.webkit.org/browser/trunk/WebCore/page/FrameTree.cpp?rev=71219#L107>, which enforces frame name uniqueness by traversing the frame tree for a frame with the requested name. I decided against having FrameTree::appendChild() update the name of the child because Frame::transferChildFrameToNewDocument() is the only code path where we may have to generate a new unique name for a frame (*), and I was unclear whether the performance implications of such a change would be negligible. I could try measuring the performance of this change. 305006 14 dbates 2010-11-04 16:52:14 -0700 I forgot to add my remark (*): (*) Currently, the code assumes a convention of setting the name of a frame before appending it to the tree. This conventions ensures that both the name of the frame is unique and that the generated name reflects its placement in the frame tree hierarchy with respect to its parent (notice, generated frame names are of the form <!--frame0-->/<!--frame1-->, where <!--frame0--> is the parent of <!--frame1-->). Ideally, we should enforce this convention; maybe through some kind of ASSERT(s); introduce a function that both sets the name and appends it to the tree, say FrameTree::setNameAndAppendChild(), or reduce the call sites that call both FrameTree::setName() and FrameTree::appendChild() (for example, these functions come up in the platform-specific FrameLoaderClient code for every port; we could try to factor out this code into some common WebCore function as a means to both reduce duplicate code and prevent a violation of the convention) 305022 15 dimich 2010-11-04 17:21:45 -0700 (In reply to comment #14) Thanks for explanation! Indeed, in some cases there can be perf impact since having name generated in appendChild may be unnecessary in some cases. I've coded what I had in mind, and didn't find it much clearer as well. I second Adam's r+ :-) 305120 16 72901 jennb 2010-11-04 20:46:53 -0700 Comment on attachment 72901 Patch with layout test View in context: https://bugs.webkit.org/attachment.cgi?id=72901&action=review > WebCore/page/Frame.cpp:730 > + if (newParent) { The old code removed the frame from oldParent even if newParent is NULL. The new code does not. >>> WebCore/page/FrameTree.cpp:75 >>> + ASSERT(child->page() == m_thisFrame->page()); >> >> Why is this true? You can't transfer frames between pages? > > I will look into this further and respond shortly. The only code path that calls this method has already updated the page before updating the FrameTree. 308757 17 dimich 2010-11-12 13:46:18 -0800 (In reply to comment #16) > (From update of attachment 72901 [details]) > View in context: https://bugs.webkit.org/attachment.cgi?id=72901&action=review > > > WebCore/page/Frame.cpp:730 > > + if (newParent) { > > The old code removed the frame from oldParent even if newParent is NULL. The new code does not. Indeed, the iframe can be transferred into a document that does not have a frame. I think a document created by XHR is one example. 308924 18 dbates 2010-11-12 21:43:54 -0800 (In reply to comment #17) > (In reply to comment #16) > > (From update of attachment 72901 [details] [details]) > > View in context: https://bugs.webkit.org/attachment.cgi?id=72901&action=review > > > > > WebCore/page/Frame.cpp:730 > > > + if (newParent) { > > > > The old code removed the frame from oldParent even if newParent is NULL. The new code does not. > > Indeed, the iframe can be transferred into a document that does not have a frame. I think a document created by XHR is one example. It is true that an <iframe> can be transferred into a document that does not have a frame. But it is not possible for newParent to be null in Frame::transferChildFrameToNewDocument() based on the the call order of HTMLFrameElementBase::setRemainsAliveOnRemovalFromTree() and Frame::transferChildFrameToNewDocument(). See the description of bug #49489 <https://bugs.webkit.org/show_bug.cgi?id=49489#c0> for more details. 308925 19 dbates 2010-11-12 21:46:53 -0800 (In reply to comment #16) > (From update of attachment 72901 [details]) > >>> WebCore/page/FrameTree.cpp:75 > >>> + ASSERT(child->page() == m_thisFrame->page()); > >> > >> Why is this true? You can't transfer frames between pages? > > > > I will look into this further and respond shortly. > > The only code path that calls this method has already updated the page before updating the FrameTree. From talking with Adam Barth on IRC yesterday (11/12), he is satisfied with this answer. 308926 20 dbates 2010-11-12 22:01:54 -0800 (In reply to comment #18) > (In reply to comment #17) > > (In reply to comment #16) > > > (From update of attachment 72901 [details] [details] [details]) > > > View in context: https://bugs.webkit.org/attachment.cgi?id=72901&action=review > > > > > > > WebCore/page/Frame.cpp:730 > > > > + if (newParent) { > > > > > > The old code removed the frame from oldParent even if newParent is NULL. The new code does not. > > > > Indeed, the iframe can be transferred into a document that does not have a frame. I think a document created by XHR is one example. > > It is true that an <iframe> can be transferred into a document that does not have a frame. I mean't to say, that an <iframe> can be adopted by another document D' and appended to D'. That is, I didn't mean to imply "transferred" as in Frame::transferChildFrameToNewDocument() is called. 308931 21 72901 dbates 2010-11-12 22:46:55 -0800 Comment on attachment 72901 Patch with layout test Clearing flags on attachment: 72901 Committed r71962: <http://trac.webkit.org/changeset/71962> 308932 22 dbates 2010-11-12 22:47:04 -0800 All reviewed patches have been landed. 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