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<dl class="meta">
<dt>Revision</dt> <dd><a href="http://trac.webkit.org/projects/webkit/changeset/208003">208003</a></dd>
<dt>Author</dt> <dd>bfulgham@apple.com</dd>
<dt>Date</dt> <dd>2016-10-27 13:56:17 -0700 (Thu, 27 Oct 2016)</dd>
</dl>
<h3>Log Message</h3>
<pre>Prevent hit tests from being performed on an invalid render tree
https://bugs.webkit.org/show_bug.cgi?id=163877
<rdar://problem/28675761>
Reviewed by Simon Fraser.
Source/WebCore:
Changeset <a href="http://trac.webkit.org/projects/webkit/changeset/200971">r200971</a> added code to ensure that layout is up-to-date before hit testing, but did
so only for the main frame. It was still possible to enter cross-frame hit testing with a
subframe needing style recalc. In that situation, the subframe's updateLayout() would get
called, which could trigger a compositing change that marked the parent frame as needing style
recalc. A subsequent layout on the parent frame (for example by hit testing traversing into
a second subframe) could then mutate the parent frame's layer tree while hit testing was
traversing it.
This patch modifies the hit test logic to ensure that a recursive layout is performed so that
we always perform hit tests on a clean set of frames. It also adds some assertions to warn
us if we encounter this invalid state.
Tested by fast/layers/prevent-hit-test-during-layout.html.
* dom/Document.cpp:
(WebCore::Document::scheduleStyleRecalc): Assert that we are not hit testing
during style recalculation.
* page/EventHandler.cpp:
(WebCore::EventHandler::hitTestResultAtPoint): Ensure that we have a clean render tree
when hit testing.
* page/FrameView.cpp:
(WebCore::FrameView::setNeedsLayout): Assert that we are not in the process of hit testing
when we schedule a layout.
* rendering/RenderView.cpp:
(WebCore::RenderView::hitTest): Mark RenderView as in an active hit test.
* rendering/RenderView.h:
LayoutTests:
* fast/layers/prevent-hit-test-during-layout-expected.txt: Added.
* fast/layers/prevent-hit-test-during-layout.html: Added.
* platform/efl/TestExpectations: Skip on this platform.
* platform/gtk/TestExpectations: Skip on this platform.
* platform/ios-simulator/TestExpectations: Skip on this platform.
* platform/win/TestExpectations: Skip on this platform.</pre>
<h3>Modified Paths</h3>
<ul>
<li><a href="#trunkLayoutTestsChangeLog">trunk/LayoutTests/ChangeLog</a></li>
<li><a href="#trunkLayoutTestsplatformeflTestExpectations">trunk/LayoutTests/platform/efl/TestExpectations</a></li>
<li><a href="#trunkLayoutTestsplatformgtkTestExpectations">trunk/LayoutTests/platform/gtk/TestExpectations</a></li>
<li><a href="#trunkLayoutTestsplatformiossimulatorTestExpectations">trunk/LayoutTests/platform/ios-simulator/TestExpectations</a></li>
<li><a href="#trunkLayoutTestsplatformwinTestExpectations">trunk/LayoutTests/platform/win/TestExpectations</a></li>
<li><a href="#trunkSourceWebCoreChangeLog">trunk/Source/WebCore/ChangeLog</a></li>
<li><a href="#trunkSourceWebCoredomDocumentcpp">trunk/Source/WebCore/dom/Document.cpp</a></li>
<li><a href="#trunkSourceWebCorepageEventHandlercpp">trunk/Source/WebCore/page/EventHandler.cpp</a></li>
<li><a href="#trunkSourceWebCorepageFrameViewcpp">trunk/Source/WebCore/page/FrameView.cpp</a></li>
<li><a href="#trunkSourceWebCorerenderingRenderViewcpp">trunk/Source/WebCore/rendering/RenderView.cpp</a></li>
<li><a href="#trunkSourceWebCorerenderingRenderViewh">trunk/Source/WebCore/rendering/RenderView.h</a></li>
</ul>
<h3>Added Paths</h3>
<ul>
<li><a href="#trunkLayoutTestsfastlayerspreventhittestduringlayoutexpectedtxt">trunk/LayoutTests/fast/layers/prevent-hit-test-during-layout-expected.txt</a></li>
<li><a href="#trunkLayoutTestsfastlayerspreventhittestduringlayouthtml">trunk/LayoutTests/fast/layers/prevent-hit-test-during-layout.html</a></li>
</ul>
</div>
<div id="patch">
<h3>Diff</h3>
<a id="trunkLayoutTestsChangeLog"></a>
<div class="modfile"><h4>Modified: trunk/LayoutTests/ChangeLog (208002 => 208003)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/LayoutTests/ChangeLog 2016-10-27 20:36:12 UTC (rev 208002)
+++ trunk/LayoutTests/ChangeLog 2016-10-27 20:56:17 UTC (rev 208003)
</span><span class="lines">@@ -1,3 +1,18 @@
</span><ins>+2016-10-25 Brent Fulgham <bfulgham@apple.com>
+
+ Prevent hit tests from being performed on an invalid render tree
+ https://bugs.webkit.org/show_bug.cgi?id=163877
+ <rdar://problem/28675761>
+
+ Reviewed by Simon Fraser.
+
+ * fast/layers/prevent-hit-test-during-layout-expected.txt: Added.
+ * fast/layers/prevent-hit-test-during-layout.html: Added.
+ * platform/efl/TestExpectations: Skip on this platform.
+ * platform/gtk/TestExpectations: Skip on this platform.
+ * platform/ios-simulator/TestExpectations: Skip on this platform.
+ * platform/win/TestExpectations: Skip on this platform.
+
</ins><span class="cx"> 2016-10-27 Chris Dumez <cdumez@apple.com>
</span><span class="cx">
</span><span class="cx"> Element parameter to CanvasRenderingContext2D.drawFocusIfNeeded() should not be nullable
</span></span></pre></div>
<a id="trunkLayoutTestsfastlayerspreventhittestduringlayoutexpectedtxt"></a>
<div class="addfile"><h4>Added: trunk/LayoutTests/fast/layers/prevent-hit-test-during-layout-expected.txt (0 => 208003)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/LayoutTests/fast/layers/prevent-hit-test-during-layout-expected.txt (rev 0)
+++ trunk/LayoutTests/fast/layers/prevent-hit-test-during-layout-expected.txt 2016-10-27 20:56:17 UTC (rev 208003)
</span><span class="lines">@@ -0,0 +1,11 @@
</span><ins>+This tests makes sure that hit tests are not processed while laying out the page.
+
+On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE".
+
+
+PASS successfullyParsed is true
+
+TEST COMPLETE
+
+
+This test passes if it did not crash.
</ins></span></pre></div>
<a id="trunkLayoutTestsfastlayerspreventhittestduringlayouthtml"></a>
<div class="addfile"><h4>Added: trunk/LayoutTests/fast/layers/prevent-hit-test-during-layout.html (0 => 208003)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/LayoutTests/fast/layers/prevent-hit-test-during-layout.html (rev 0)
+++ trunk/LayoutTests/fast/layers/prevent-hit-test-during-layout.html 2016-10-27 20:56:17 UTC (rev 208003)
</span><span class="lines">@@ -0,0 +1,56 @@
</span><ins>+<!DOCTYPE html>
+<html>
+<head>
+ <script src="../../resources/js-test-pre.js"></script>
+ <script>
+ var fixedDiv;
+ var target;
+
+ if (window.testRunner) {
+ description("This tests makes sure that hit tests are not processed while laying out the page.");
+ testRunner.waitUntilDone();
+ }
+
+ function triggerHitTest() {
+ var spanRects = target.getClientRects();
+
+ if (spanRects.count > 1) {
+ document.body.innerHTML += "<br/>ERROR: More than one rect for hit word."
+ testRunner.notifyDone();
+ return;
+ }
+
+ var rect = spanRects[0];
+ var x = rect.left + rect.width / 2;
+ var y = rect.top + rect.height / 2;
+
+ // This internal test call is used because it is guaranteed to trigger
+ // a recursive hit test. Dictionary lookup itself is not required for this test.
+ var lookupRange = internals.rangeForDictionaryLookupAtLocation(x, y);
+
+ document.body.innerHTML += "<br/>This test passes if it did not crash.";
+ testRunner.notifyDone();
+ }
+
+ function runTest() {
+ fixedDiv = window.frames['fixedFrame'].document.getElementById('fixedDiv');
+ target = document.getElementById('target');
+
+ setTimeout(function() {
+ fixedDiv.style.position = "relative";
+ triggerHitTest();
+ }, 0);
+ }
+ </script>
+</head>
+<body onload="runTest()">
+ <div>
+ <iframe id="fixedFrame" src='data:text/html,
+ <div id="fixedDiv" style="position:fixed; left:10px; top:10px">Fixed Frame.</div>'>
+ </iframe>
+ <iframe id="target" src='data:text/html,<div>Second Frame.</div>'></iframe>
+ <iframe src='data:text/html,<div>Third Frame.</div>'></iframe>
+ </div>
+ <script src="../../resources/js-test-post.js"></script>
+</body>
+</html>
</ins><span class="cx">\ No newline at end of file
</span></span></pre></div>
<a id="trunkLayoutTestsplatformeflTestExpectations"></a>
<div class="modfile"><h4>Modified: trunk/LayoutTests/platform/efl/TestExpectations (208002 => 208003)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/LayoutTests/platform/efl/TestExpectations 2016-10-27 20:36:12 UTC (rev 208002)
+++ trunk/LayoutTests/platform/efl/TestExpectations 2016-10-27 20:56:17 UTC (rev 208003)
</span><span class="lines">@@ -596,6 +596,9 @@
</span><span class="cx"> security/contentSecurityPolicy/plugins-types-blocks-youtube-plugin-replacement-without-mime-type.html [ Skip ]
</span><span class="cx"> security/contentSecurityPolicy/plugins-types-blocks-youtube-plugin-replacement.html [ Skip ]
</span><span class="cx">
</span><ins>+# Only Mac has implemented DictionaryLookup
+fast/layers/prevent-hit-test-during-layout.html [ Skip ]
+
</ins><span class="cx"> #////////////////////////////////////////////////////////////////////////////////////////
</span><span class="cx"> # CRASHES
</span><span class="cx"> #////////////////////////////////////////////////////////////////////////////////////////
</span></span></pre></div>
<a id="trunkLayoutTestsplatformgtkTestExpectations"></a>
<div class="modfile"><h4>Modified: trunk/LayoutTests/platform/gtk/TestExpectations (208002 => 208003)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/LayoutTests/platform/gtk/TestExpectations 2016-10-27 20:36:12 UTC (rev 208002)
+++ trunk/LayoutTests/platform/gtk/TestExpectations 2016-10-27 20:56:17 UTC (rev 208003)
</span><span class="lines">@@ -1704,6 +1704,9 @@
</span><span class="cx"> webkit.org/b/152247 fast/forms/input-appearance-spinbutton.html [ Skip ]
</span><span class="cx"> webkit.org/b/152247 fast/forms/listbox-scrollbar-hit-test.html [ Skip ]
</span><span class="cx">
</span><ins>+# Only Mac has implemented DictionaryLookup
+fast/layers/prevent-hit-test-during-layout.html [ Skip ]
+
</ins><span class="cx"> #////////////////////////////////////////////////////////////////////////////////////////
</span><span class="cx"> # End of tests with architecture-specific results
</span><span class="cx"> #////////////////////////////////////////////////////////////////////////////////////////
</span></span></pre></div>
<a id="trunkLayoutTestsplatformiossimulatorTestExpectations"></a>
<div class="modfile"><h4>Modified: trunk/LayoutTests/platform/ios-simulator/TestExpectations (208002 => 208003)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/LayoutTests/platform/ios-simulator/TestExpectations 2016-10-27 20:36:12 UTC (rev 208002)
+++ trunk/LayoutTests/platform/ios-simulator/TestExpectations 2016-10-27 20:56:17 UTC (rev 208003)
</span><span class="lines">@@ -2731,3 +2731,6 @@
</span><span class="cx"> webkit.org/b/163632 fast/text/variations/getComputedStyle.html [ Skip ]
</span><span class="cx">
</span><span class="cx"> webkit.org/b/158836 imported/w3c/web-platform-tests/encrypted-media [ Skip ]
</span><ins>+
+# Only Mac has implemented DictionaryLookup
+fast/layers/prevent-hit-test-during-layout.html [ Skip ]
</ins><span class="cx">\ No newline at end of file
</span></span></pre></div>
<a id="trunkLayoutTestsplatformwinTestExpectations"></a>
<div class="modfile"><h4>Modified: trunk/LayoutTests/platform/win/TestExpectations (208002 => 208003)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/LayoutTests/platform/win/TestExpectations 2016-10-27 20:36:12 UTC (rev 208002)
+++ trunk/LayoutTests/platform/win/TestExpectations 2016-10-27 20:56:17 UTC (rev 208003)
</span><span class="lines">@@ -3622,3 +3622,6 @@
</span><span class="cx">
</span><span class="cx"> # html/syntax web platform tests are failing on Windows.
</span><span class="cx"> webkit.org/b/162415 imported/w3c/web-platform-tests/html/syntax [ Skip ]
</span><ins>+
+# Only Mac has implemented DictionaryLookup
+fast/layers/prevent-hit-test-during-layout.html [ Skip ]
</ins></span></pre></div>
<a id="trunkSourceWebCoreChangeLog"></a>
<div class="modfile"><h4>Modified: trunk/Source/WebCore/ChangeLog (208002 => 208003)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/WebCore/ChangeLog 2016-10-27 20:36:12 UTC (rev 208002)
+++ trunk/Source/WebCore/ChangeLog 2016-10-27 20:56:17 UTC (rev 208003)
</span><span class="lines">@@ -1,3 +1,38 @@
</span><ins>+2016-10-27 Brent Fulgham <bfulgham@apple.com>
+
+ Prevent hit tests from being performed on an invalid render tree
+ https://bugs.webkit.org/show_bug.cgi?id=163877
+ <rdar://problem/28675761>
+
+ Reviewed by Simon Fraser.
+
+ Changeset r200971 added code to ensure that layout is up-to-date before hit testing, but did
+ so only for the main frame. It was still possible to enter cross-frame hit testing with a
+ subframe needing style recalc. In that situation, the subframe's updateLayout() would get
+ called, which could trigger a compositing change that marked the parent frame as needing style
+ recalc. A subsequent layout on the parent frame (for example by hit testing traversing into
+ a second subframe) could then mutate the parent frame's layer tree while hit testing was
+ traversing it.
+
+ This patch modifies the hit test logic to ensure that a recursive layout is performed so that
+ we always perform hit tests on a clean set of frames. It also adds some assertions to warn
+ us if we encounter this invalid state.
+
+ Tested by fast/layers/prevent-hit-test-during-layout.html.
+
+ * dom/Document.cpp:
+ (WebCore::Document::scheduleStyleRecalc): Assert that we are not hit testing
+ during style recalculation.
+ * page/EventHandler.cpp:
+ (WebCore::EventHandler::hitTestResultAtPoint): Ensure that we have a clean render tree
+ when hit testing.
+ * page/FrameView.cpp:
+ (WebCore::FrameView::setNeedsLayout): Assert that we are not in the process of hit testing
+ when we schedule a layout.
+ * rendering/RenderView.cpp:
+ (WebCore::RenderView::hitTest): Mark RenderView as in an active hit test.
+ * rendering/RenderView.h:
+
</ins><span class="cx"> 2016-10-27 Zan Dobersek <zdobersek@igalia.com>
</span><span class="cx">
</span><span class="cx"> BufferSource should behave as an union
</span></span></pre></div>
<a id="trunkSourceWebCoredomDocumentcpp"></a>
<div class="modfile"><h4>Modified: trunk/Source/WebCore/dom/Document.cpp (208002 => 208003)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/WebCore/dom/Document.cpp 2016-10-27 20:36:12 UTC (rev 208002)
+++ trunk/Source/WebCore/dom/Document.cpp 2016-10-27 20:56:17 UTC (rev 208003)
</span><span class="lines">@@ -1755,6 +1755,8 @@
</span><span class="cx">
</span><span class="cx"> void Document::scheduleStyleRecalc()
</span><span class="cx"> {
</span><ins>+ ASSERT(!m_renderView || !m_renderView->inHitTesting());
+
</ins><span class="cx"> if (m_styleRecalcTimer.isActive() || pageCacheState() != NotInPageCache)
</span><span class="cx"> return;
</span><span class="cx">
</span></span></pre></div>
<a id="trunkSourceWebCorepageEventHandlercpp"></a>
<div class="modfile"><h4>Modified: trunk/Source/WebCore/page/EventHandler.cpp (208002 => 208003)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/WebCore/page/EventHandler.cpp 2016-10-27 20:36:12 UTC (rev 208002)
+++ trunk/Source/WebCore/page/EventHandler.cpp 2016-10-27 20:56:17 UTC (rev 208003)
</span><span class="lines">@@ -1145,9 +1145,11 @@
</span><span class="cx">
</span><span class="cx"> unsigned nonNegativePaddingWidth = std::max<LayoutUnit>(0, padding.width()).toUnsigned();
</span><span class="cx"> unsigned nonNegativePaddingHeight = std::max<LayoutUnit>(0, padding.height()).toUnsigned();
</span><ins>+
</ins><span class="cx"> // We should always start hit testing a clean tree.
</span><del>- if (m_frame.document())
- m_frame.document()->updateLayoutIgnorePendingStylesheets();
</del><ins>+ if (auto* frameView = m_frame.view())
+ frameView->updateLayoutAndStyleIfNeededRecursive();
+
</ins><span class="cx"> HitTestResult result(point, nonNegativePaddingHeight, nonNegativePaddingWidth, nonNegativePaddingHeight, nonNegativePaddingWidth);
</span><span class="cx"> RenderView* renderView = m_frame.contentRenderer();
</span><span class="cx"> if (!renderView)
</span></span></pre></div>
<a id="trunkSourceWebCorepageFrameViewcpp"></a>
<div class="modfile"><h4>Modified: trunk/Source/WebCore/page/FrameView.cpp (208002 => 208003)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/WebCore/page/FrameView.cpp 2016-10-27 20:36:12 UTC (rev 208002)
+++ trunk/Source/WebCore/page/FrameView.cpp 2016-10-27 20:56:17 UTC (rev 208003)
</span><span class="lines">@@ -2845,8 +2845,10 @@
</span><span class="cx"> return;
</span><span class="cx"> }
</span><span class="cx">
</span><del>- if (RenderView* renderView = this->renderView())
</del><ins>+ if (auto* renderView = this->renderView()) {
+ ASSERT(!renderView->inHitTesting());
</ins><span class="cx"> renderView->setNeedsLayout();
</span><ins>+ }
</ins><span class="cx"> }
</span><span class="cx">
</span><span class="cx"> void FrameView::unscheduleRelayout()
</span></span></pre></div>
<a id="trunkSourceWebCorerenderingRenderViewcpp"></a>
<div class="modfile"><h4>Modified: trunk/Source/WebCore/rendering/RenderView.cpp (208002 => 208003)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/WebCore/rendering/RenderView.cpp 2016-10-27 20:36:12 UTC (rev 208002)
+++ trunk/Source/WebCore/rendering/RenderView.cpp 2016-10-27 20:56:17 UTC (rev 208003)
</span><span class="lines">@@ -52,6 +52,7 @@
</span><span class="cx"> #include "StyleInheritedData.h"
</span><span class="cx"> #include "TransformState.h"
</span><span class="cx"> #include <wtf/StackStats.h>
</span><ins>+#include <wtf/TemporaryChange.h>
</ins><span class="cx">
</span><span class="cx"> namespace WebCore {
</span><span class="cx">
</span><span class="lines">@@ -183,6 +184,10 @@
</span><span class="cx"> bool RenderView::hitTest(const HitTestRequest& request, const HitTestLocation& location, HitTestResult& result)
</span><span class="cx"> {
</span><span class="cx"> document().updateLayout();
</span><ins>+
+#if !ASSERT_DISABLED
+ TemporaryChange<bool> hitTestRestorer { m_inHitTesting, true };
+#endif
</ins><span class="cx">
</span><span class="cx"> FrameFlatteningLayoutDisallower disallower(frameView());
</span><span class="cx">
</span></span></pre></div>
<a id="trunkSourceWebCorerenderingRenderViewh"></a>
<div class="modfile"><h4>Modified: trunk/Source/WebCore/rendering/RenderView.h (208002 => 208003)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/WebCore/rendering/RenderView.h 2016-10-27 20:36:12 UTC (rev 208002)
+++ trunk/Source/WebCore/rendering/RenderView.h 2016-10-27 20:56:17 UTC (rev 208003)
</span><span class="lines">@@ -1,6 +1,6 @@
</span><span class="cx"> /*
</span><span class="cx"> * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
</span><del>- * Copyright (C) 2006, 2015 Apple Inc.
</del><ins>+ * Copyright (C) 2006, 2015-2016 Apple Inc.
</ins><span class="cx"> *
</span><span class="cx"> * This library is free software; you can redistribute it and/or
</span><span class="cx"> * modify it under the terms of the GNU Library General Public
</span><span class="lines">@@ -250,6 +250,10 @@
</span><span class="cx"> const HashSet<const RenderBox*>& boxesWithScrollSnapCoordinates() { return m_boxesWithScrollSnapCoordinates; }
</span><span class="cx"> #endif
</span><span class="cx">
</span><ins>+#if !ASSERT_DISABLED
+ bool inHitTesting() const { return m_inHitTesting; }
+#endif
+
</ins><span class="cx"> protected:
</span><span class="cx"> void mapLocalToContainer(const RenderLayerModelObject* repaintContainer, TransformState&, MapCoordinatesFlags, bool* wasFixed) const override;
</span><span class="cx"> const RenderObject* pushMappingToContainer(const RenderLayerModelObject* ancestorToStopAt, RenderGeometryMap&) const override;
</span><span class="lines">@@ -360,6 +364,9 @@
</span><span class="cx"> bool m_hasSoftwareFilters { false };
</span><span class="cx"> bool m_usesFirstLineRules { false };
</span><span class="cx"> bool m_usesFirstLetterRules { false };
</span><ins>+#if !ASSERT_DISABLED
+ bool m_inHitTesting { false };
+#endif
</ins><span class="cx">
</span><span class="cx"> HashSet<RenderElement*> m_renderersWithPausedImageAnimation;
</span><span class="cx"> HashSet<RenderElement*> m_visibleInViewportRenderers;
</span></span></pre>
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