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<dt>Revision</dt> <dd><a href="http://trac.webkit.org/projects/webkit/changeset/178320">178320</a></dd>
<dt>Author</dt> <dd>carlosgc@webkit.org</dd>
<dt>Date</dt> <dd>2015-01-13 00:05:38 -0800 (Tue, 13 Jan 2015)</dd>
</dl>
<h3>Log Message</h3>
<pre>Merge <a href="http://trac.webkit.org/projects/webkit/changeset/176803">r176803</a> - Serialization of MapData object provides unsafe access to internal types
https://bugs.webkit.org/show_bug.cgi?id=138653
Patch by Oliver Hunt <oliver@apple.com> on 2014-12-04
Reviewed by Geoffrey Garen.
Source/JavaScriptCore:
Converting these ASSERTs into RELEASE_ASSERTs, as it is now obvious
that despite trying hard to be safe in all cases it's simply to easy
to use an iterator in an unsafe state.
* runtime/MapData.h:
(JSC::MapData::const_iterator::key):
(JSC::MapData::const_iterator::value):
Source/WebCore:
We now keep the value portion of the key/value pair in MapData as a
separate stack. This allows us to maintain the spec semantic of
"atomic" serialisation of the key/value pair without retaining the
use of a potentially invalid iterator.
* bindings/js/SerializedScriptValue.cpp:
(WebCore::CloneSerializer::serialize):</pre>
<h3>Modified Paths</h3>
<ul>
<li><a href="#releasesWebKitGTKwebkit26SourceJavaScriptCoreChangeLog">releases/WebKitGTK/webkit-2.6/Source/JavaScriptCore/ChangeLog</a></li>
<li><a href="#releasesWebKitGTKwebkit26SourceJavaScriptCoreruntimeMapDatah">releases/WebKitGTK/webkit-2.6/Source/JavaScriptCore/runtime/MapData.h</a></li>
<li><a href="#releasesWebKitGTKwebkit26SourceWebCoreChangeLog">releases/WebKitGTK/webkit-2.6/Source/WebCore/ChangeLog</a></li>
<li><a href="#releasesWebKitGTKwebkit26SourceWebCorebindingsjsSerializedScriptValuecpp">releases/WebKitGTK/webkit-2.6/Source/WebCore/bindings/js/SerializedScriptValue.cpp</a></li>
</ul>
</div>
<div id="patch">
<h3>Diff</h3>
<a id="releasesWebKitGTKwebkit26SourceJavaScriptCoreChangeLog"></a>
<div class="modfile"><h4>Modified: releases/WebKitGTK/webkit-2.6/Source/JavaScriptCore/ChangeLog (178319 => 178320)</h4>
<pre class="diff"><span>
<span class="info">--- releases/WebKitGTK/webkit-2.6/Source/JavaScriptCore/ChangeLog 2015-01-13 08:00:27 UTC (rev 178319)
+++ releases/WebKitGTK/webkit-2.6/Source/JavaScriptCore/ChangeLog 2015-01-13 08:05:38 UTC (rev 178320)
</span><span class="lines">@@ -1,3 +1,18 @@
</span><ins>+2014-12-04 Oliver Hunt <oliver@apple.com>
+
+ Serialization of MapData object provides unsafe access to internal types
+ https://bugs.webkit.org/show_bug.cgi?id=138653
+
+ Reviewed by Geoffrey Garen.
+
+ Converting these ASSERTs into RELEASE_ASSERTs, as it is now obvious
+ that despite trying hard to be safe in all cases it's simply to easy
+ to use an iterator in an unsafe state.
+
+ * runtime/MapData.h:
+ (JSC::MapData::const_iterator::key):
+ (JSC::MapData::const_iterator::value):
+
</ins><span class="cx"> 2014-12-02 Matthew Mirman <mmirman@apple.com>
</span><span class="cx">
</span><span class="cx"> Fixes inline cache fast path accessing nonexistant getters.
</span></span></pre></div>
<a id="releasesWebKitGTKwebkit26SourceJavaScriptCoreruntimeMapDatah"></a>
<div class="modfile"><h4>Modified: releases/WebKitGTK/webkit-2.6/Source/JavaScriptCore/runtime/MapData.h (178319 => 178320)</h4>
<pre class="diff"><span>
<span class="info">--- releases/WebKitGTK/webkit-2.6/Source/JavaScriptCore/runtime/MapData.h 2015-01-13 08:00:27 UTC (rev 178319)
+++ releases/WebKitGTK/webkit-2.6/Source/JavaScriptCore/runtime/MapData.h 2015-01-13 08:05:38 UTC (rev 178320)
</span><span class="lines">@@ -42,8 +42,8 @@
</span><span class="cx"> const_iterator(const MapData*);
</span><span class="cx"> ~const_iterator();
</span><span class="cx"> const WTF::KeyValuePair<JSValue, JSValue> operator*() const;
</span><del>- JSValue key() const { ASSERT(!atEnd()); return m_mapData->m_entries[m_index].key.get(); }
- JSValue value() const { ASSERT(!atEnd()); return m_mapData->m_entries[m_index].value.get(); }
</del><ins>+ JSValue key() const { RELEASE_ASSERT(!atEnd()); return m_mapData->m_entries[m_index].key.get(); }
+ JSValue value() const { RELEASE_ASSERT(!atEnd()); return m_mapData->m_entries[m_index].value.get(); }
</ins><span class="cx"> void operator++() { ASSERT(!atEnd()); internalIncrement(); }
</span><span class="cx"> static const_iterator end(const MapData*);
</span><span class="cx"> bool operator!=(const const_iterator& other);
</span></span></pre></div>
<a id="releasesWebKitGTKwebkit26SourceWebCoreChangeLog"></a>
<div class="modfile"><h4>Modified: releases/WebKitGTK/webkit-2.6/Source/WebCore/ChangeLog (178319 => 178320)</h4>
<pre class="diff"><span>
<span class="info">--- releases/WebKitGTK/webkit-2.6/Source/WebCore/ChangeLog 2015-01-13 08:00:27 UTC (rev 178319)
+++ releases/WebKitGTK/webkit-2.6/Source/WebCore/ChangeLog 2015-01-13 08:05:38 UTC (rev 178320)
</span><span class="lines">@@ -1,3 +1,18 @@
</span><ins>+2014-12-04 Oliver Hunt <oliver@apple.com>
+
+ Serialization of MapData object provides unsafe access to internal types
+ https://bugs.webkit.org/show_bug.cgi?id=138653
+
+ Reviewed by Geoffrey Garen.
+
+ We now keep the value portion of the key/value pair in MapData as a
+ separate stack. This allows us to maintain the spec semantic of
+ "atomic" serialisation of the key/value pair without retaining the
+ use of a potentially invalid iterator.
+
+ * bindings/js/SerializedScriptValue.cpp:
+ (WebCore::CloneSerializer::serialize):
+
</ins><span class="cx"> 2014-12-03 Myles C. Maxfield <mmaxfield@apple.com>
</span><span class="cx">
</span><span class="cx"> List markers in RTL languages do not draw the first character.
</span></span></pre></div>
<a id="releasesWebKitGTKwebkit26SourceWebCorebindingsjsSerializedScriptValuecpp"></a>
<div class="modfile"><h4>Modified: releases/WebKitGTK/webkit-2.6/Source/WebCore/bindings/js/SerializedScriptValue.cpp (178319 => 178320)</h4>
<pre class="diff"><span>
<span class="info">--- releases/WebKitGTK/webkit-2.6/Source/WebCore/bindings/js/SerializedScriptValue.cpp 2015-01-13 08:00:27 UTC (rev 178319)
+++ releases/WebKitGTK/webkit-2.6/Source/WebCore/bindings/js/SerializedScriptValue.cpp 2015-01-13 08:05:38 UTC (rev 178320)
</span><span class="lines">@@ -1218,6 +1218,7 @@
</span><span class="cx"> Vector<JSObject*, 32> inputObjectStack;
</span><span class="cx"> Vector<MapData*, 4> mapDataStack;
</span><span class="cx"> Vector<MapData::const_iterator, 4> iteratorStack;
</span><ins>+ Vector<JSValue, 4> iteratorValueStack;
</ins><span class="cx"> Vector<WalkerState, 16> stateStack;
</span><span class="cx"> WalkerState state = StateUnknown;
</span><span class="cx"> JSValue inValue = in;
</span><span class="lines">@@ -1386,16 +1387,20 @@
</span><span class="cx"> goto objectStartVisitMember;
</span><span class="cx"> }
</span><span class="cx"> inValue = ptr.key();
</span><ins>+ m_gcBuffer.append(ptr.value());
+ iteratorValueStack.append(ptr.value());
</ins><span class="cx"> stateStack.append(MapDataEndVisitKey);
</span><span class="cx"> goto stateUnknown;
</span><span class="cx"> }
</span><span class="cx"> case MapDataEndVisitKey: {
</span><del>- inValue = iteratorStack.last().value();
</del><ins>+ inValue = iteratorValueStack.last();
+ iteratorValueStack.removeLast();
</ins><span class="cx"> stateStack.append(MapDataEndVisitValue);
</span><span class="cx"> goto stateUnknown;
</span><span class="cx"> }
</span><span class="cx"> case MapDataEndVisitValue: {
</span><del>- ++iteratorStack.last();
</del><ins>+ if (iteratorStack.last() != mapDataStack.last()->end())
+ ++iteratorStack.last();
</ins><span class="cx"> goto mapDataStartVisitEntry;
</span><span class="cx"> }
</span><span class="cx">
</span></span></pre>
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