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<dt>Revision</dt> <dd><a href="http://trac.webkit.org/projects/webkit/changeset/242445">242445</a></dd>
<dt>Author</dt> <dd>carlosgc@webkit.org</dd>
<dt>Date</dt> <dd>2019-03-05 04:40:50 -0800 (Tue, 05 Mar 2019)</dd>
</dl>
<h3>Log Message</h3>
<pre>Merge <a href="http://trac.webkit.org/projects/webkit/changeset/241991">r241991</a> - Add an exception check and some assertions in StringPrototype.cpp.
https://bugs.webkit.org/show_bug.cgi?id=194962
<rdar://problem/48013416>
Reviewed by Yusuke Suzuki and Saam Barati.
Source/JavaScriptCore:
* runtime/StringPrototype.cpp:
(JSC::jsSpliceSubstrings):
(JSC::jsSpliceSubstringsWithSeparators):
(JSC::operationStringProtoFuncReplaceRegExpEmptyStr):
Source/WTF:
Add an AssertNoOverflow overflow handler which allows us to do CheckedArithmetic
for assertion purpose only on debug builds but sacrifices no performance on
release builds.
* wtf/CheckedArithmetic.h:
(WTF::AssertNoOverflow::overflowed):
(WTF::AssertNoOverflow::clearOverflow):
(WTF::AssertNoOverflow::crash):
(WTF::AssertNoOverflow::hasOverflowed const):
(WTF::observesOverflow):
(WTF::observesOverflow<AssertNoOverflow>):
(WTF::safeAdd):
(WTF::safeSub):
(WTF::safeMultiply):
(WTF::Checked::operator+=):
(WTF::Checked::operator-=):
(WTF::Checked::operator*=):
(WTF::operator+):
(WTF::operator-):
(WTF::operator*):</pre>
<h3>Modified Paths</h3>
<ul>
<li><a href="#releasesWebKitGTKwebkit224SourceJavaScriptCoreChangeLog">releases/WebKitGTK/webkit-2.24/Source/JavaScriptCore/ChangeLog</a></li>
<li><a href="#releasesWebKitGTKwebkit224SourceJavaScriptCoreruntimeStringPrototypecpp">releases/WebKitGTK/webkit-2.24/Source/JavaScriptCore/runtime/StringPrototype.cpp</a></li>
<li><a href="#releasesWebKitGTKwebkit224SourceWTFChangeLog">releases/WebKitGTK/webkit-2.24/Source/WTF/ChangeLog</a></li>
<li><a href="#releasesWebKitGTKwebkit224SourceWTFwtfCheckedArithmetich">releases/WebKitGTK/webkit-2.24/Source/WTF/wtf/CheckedArithmetic.h</a></li>
</ul>
</div>
<div id="patch">
<h3>Diff</h3>
<a id="releasesWebKitGTKwebkit224SourceJavaScriptCoreChangeLog"></a>
<div class="modfile"><h4>Modified: releases/WebKitGTK/webkit-2.24/Source/JavaScriptCore/ChangeLog (242444 => 242445)</h4>
<pre class="diff"><span>
<span class="info">--- releases/WebKitGTK/webkit-2.24/Source/JavaScriptCore/ChangeLog 2019-03-05 12:40:47 UTC (rev 242444)
+++ releases/WebKitGTK/webkit-2.24/Source/JavaScriptCore/ChangeLog 2019-03-05 12:40:50 UTC (rev 242445)
</span><span class="lines">@@ -1,3 +1,16 @@
</span><ins>+2019-02-23 Mark Lam <mark.lam@apple.com>
+
+ Add an exception check and some assertions in StringPrototype.cpp.
+ https://bugs.webkit.org/show_bug.cgi?id=194962
+ <rdar://problem/48013416>
+
+ Reviewed by Yusuke Suzuki and Saam Barati.
+
+ * runtime/StringPrototype.cpp:
+ (JSC::jsSpliceSubstrings):
+ (JSC::jsSpliceSubstringsWithSeparators):
+ (JSC::operationStringProtoFuncReplaceRegExpEmptyStr):
+
</ins><span class="cx"> 2019-02-22 Robin Morisset <rmorisset@apple.com>
</span><span class="cx">
</span><span class="cx"> DFGBytecodeParser should not declare that a node won't clobberExit if DFGFixupPhase can later declare it does clobberExit
</span></span></pre></div>
<a id="releasesWebKitGTKwebkit224SourceJavaScriptCoreruntimeStringPrototypecpp"></a>
<div class="modfile"><h4>Modified: releases/WebKitGTK/webkit-2.24/Source/JavaScriptCore/runtime/StringPrototype.cpp (242444 => 242445)</h4>
<pre class="diff"><span>
<span class="info">--- releases/WebKitGTK/webkit-2.24/Source/JavaScriptCore/runtime/StringPrototype.cpp 2019-03-05 12:40:47 UTC (rev 242444)
+++ releases/WebKitGTK/webkit-2.24/Source/JavaScriptCore/runtime/StringPrototype.cpp 2019-03-05 12:40:50 UTC (rev 242445)
</span><span class="lines">@@ -1,6 +1,6 @@
</span><span class="cx"> /*
</span><span class="cx"> * Copyright (C) 1999-2001 Harri Porten (porten@kde.org)
</span><del>- * Copyright (C) 2004-2017 Apple Inc. All rights reserved.
</del><ins>+ * Copyright (C) 2004-2019 Apple Inc. All rights reserved.
</ins><span class="cx"> * Copyright (C) 2009 Torch Mobile, Inc.
</span><span class="cx"> * Copyright (C) 2015 Jordan Harband (ljharb@gmail.com)
</span><span class="cx"> *
</span><span class="lines">@@ -324,9 +324,14 @@
</span><span class="cx"> RELEASE_AND_RETURN(scope, jsString(exec, StringImpl::createSubstringSharingImpl(*source.impl(), std::max(0, position), std::min(sourceSize, length))));
</span><span class="cx"> }
</span><span class="cx">
</span><del>- int totalLength = 0;
</del><ins>+ // We know that the sum of substringRanges lengths cannot exceed length of
+ // source because the substringRanges were computed from the source string
+ // in removeUsingRegExpSearch(). Hence, totalLength cannot exceed
+ // String::MaxLength, and therefore, cannot overflow.
+ Checked<int, AssertNoOverflow> totalLength = 0;
</ins><span class="cx"> for (int i = 0; i < rangeCount; i++)
</span><span class="cx"> totalLength += substringRanges[i].length;
</span><ins>+ ASSERT(totalLength <= String::MaxLength);
</ins><span class="cx">
</span><span class="cx"> if (!totalLength)
</span><span class="cx"> return jsEmptyString(exec);
</span><span class="lines">@@ -334,16 +339,16 @@
</span><span class="cx"> if (source.is8Bit()) {
</span><span class="cx"> LChar* buffer;
</span><span class="cx"> const LChar* sourceData = source.characters8();
</span><del>- auto impl = StringImpl::tryCreateUninitialized(totalLength, buffer);
</del><ins>+ auto impl = StringImpl::tryCreateUninitialized(totalLength.unsafeGet(), buffer);
</ins><span class="cx"> if (!impl) {
</span><span class="cx"> throwOutOfMemoryError(exec, scope);
</span><span class="cx"> return nullptr;
</span><span class="cx"> }
</span><span class="cx">
</span><del>- int bufferPos = 0;
</del><ins>+ Checked<int, AssertNoOverflow> bufferPos = 0;
</ins><span class="cx"> for (int i = 0; i < rangeCount; i++) {
</span><span class="cx"> if (int srcLen = substringRanges[i].length) {
</span><del>- StringImpl::copyCharacters(buffer + bufferPos, sourceData + substringRanges[i].position, srcLen);
</del><ins>+ StringImpl::copyCharacters(buffer + bufferPos.unsafeGet(), sourceData + substringRanges[i].position, srcLen);
</ins><span class="cx"> bufferPos += srcLen;
</span><span class="cx"> }
</span><span class="cx"> }
</span><span class="lines">@@ -354,16 +359,16 @@
</span><span class="cx"> UChar* buffer;
</span><span class="cx"> const UChar* sourceData = source.characters16();
</span><span class="cx">
</span><del>- auto impl = StringImpl::tryCreateUninitialized(totalLength, buffer);
</del><ins>+ auto impl = StringImpl::tryCreateUninitialized(totalLength.unsafeGet(), buffer);
</ins><span class="cx"> if (!impl) {
</span><span class="cx"> throwOutOfMemoryError(exec, scope);
</span><span class="cx"> return nullptr;
</span><span class="cx"> }
</span><span class="cx">
</span><del>- int bufferPos = 0;
</del><ins>+ Checked<int, AssertNoOverflow> bufferPos = 0;
</ins><span class="cx"> for (int i = 0; i < rangeCount; i++) {
</span><span class="cx"> if (int srcLen = substringRanges[i].length) {
</span><del>- StringImpl::copyCharacters(buffer + bufferPos, sourceData + substringRanges[i].position, srcLen);
</del><ins>+ StringImpl::copyCharacters(buffer + bufferPos.unsafeGet(), sourceData + substringRanges[i].position, srcLen);
</ins><span class="cx"> bufferPos += srcLen;
</span><span class="cx"> }
</span><span class="cx"> }
</span><span class="lines">@@ -414,17 +419,17 @@
</span><span class="cx"> }
</span><span class="cx">
</span><span class="cx"> int maxCount = std::max(rangeCount, separatorCount);
</span><del>- int bufferPos = 0;
</del><ins>+ Checked<int, AssertNoOverflow> bufferPos = 0;
</ins><span class="cx"> for (int i = 0; i < maxCount; i++) {
</span><span class="cx"> if (i < rangeCount) {
</span><span class="cx"> if (int srcLen = substringRanges[i].length) {
</span><del>- StringImpl::copyCharacters(buffer + bufferPos, sourceData + substringRanges[i].position, srcLen);
</del><ins>+ StringImpl::copyCharacters(buffer + bufferPos.unsafeGet(), sourceData + substringRanges[i].position, srcLen);
</ins><span class="cx"> bufferPos += srcLen;
</span><span class="cx"> }
</span><span class="cx"> }
</span><span class="cx"> if (i < separatorCount) {
</span><span class="cx"> if (int sepLen = separators[i].length()) {
</span><del>- StringImpl::copyCharacters(buffer + bufferPos, separators[i].characters8(), sepLen);
</del><ins>+ StringImpl::copyCharacters(buffer + bufferPos.unsafeGet(), separators[i].characters8(), sepLen);
</ins><span class="cx"> bufferPos += sepLen;
</span><span class="cx"> }
</span><span class="cx"> }
</span><span class="lines">@@ -441,14 +446,14 @@
</span><span class="cx"> }
</span><span class="cx">
</span><span class="cx"> int maxCount = std::max(rangeCount, separatorCount);
</span><del>- int bufferPos = 0;
</del><ins>+ Checked<int, AssertNoOverflow> bufferPos = 0;
</ins><span class="cx"> for (int i = 0; i < maxCount; i++) {
</span><span class="cx"> if (i < rangeCount) {
</span><span class="cx"> if (int srcLen = substringRanges[i].length) {
</span><span class="cx"> if (source.is8Bit())
</span><del>- StringImpl::copyCharacters(buffer + bufferPos, source.characters8() + substringRanges[i].position, srcLen);
</del><ins>+ StringImpl::copyCharacters(buffer + bufferPos.unsafeGet(), source.characters8() + substringRanges[i].position, srcLen);
</ins><span class="cx"> else
</span><del>- StringImpl::copyCharacters(buffer + bufferPos, source.characters16() + substringRanges[i].position, srcLen);
</del><ins>+ StringImpl::copyCharacters(buffer + bufferPos.unsafeGet(), source.characters16() + substringRanges[i].position, srcLen);
</ins><span class="cx"> bufferPos += srcLen;
</span><span class="cx"> }
</span><span class="cx"> }
</span><span class="lines">@@ -455,9 +460,9 @@
</span><span class="cx"> if (i < separatorCount) {
</span><span class="cx"> if (int sepLen = separators[i].length()) {
</span><span class="cx"> if (separators[i].is8Bit())
</span><del>- StringImpl::copyCharacters(buffer + bufferPos, separators[i].characters8(), sepLen);
</del><ins>+ StringImpl::copyCharacters(buffer + bufferPos.unsafeGet(), separators[i].characters8(), sepLen);
</ins><span class="cx"> else
</span><del>- StringImpl::copyCharacters(buffer + bufferPos, separators[i].characters16(), sepLen);
</del><ins>+ StringImpl::copyCharacters(buffer + bufferPos.unsafeGet(), separators[i].characters16(), sepLen);
</ins><span class="cx"> bufferPos += sepLen;
</span><span class="cx"> }
</span><span class="cx"> }
</span><span class="lines">@@ -729,7 +734,9 @@
</span><span class="cx"> // ES5.1 15.5.4.10 step 8.a.
</span><span class="cx"> searchValue->setLastIndex(exec, 0);
</span><span class="cx"> RETURN_IF_EXCEPTION(scope, nullptr);
</span><del>- RELEASE_AND_RETURN(scope, removeUsingRegExpSearch(vm, exec, thisValue, thisValue->value(exec), regExp));
</del><ins>+ const String& source = thisValue->value(exec);
+ RETURN_IF_EXCEPTION(scope, nullptr);
+ RELEASE_AND_RETURN(scope, removeUsingRegExpSearch(vm, exec, thisValue, source, regExp));
</ins><span class="cx"> }
</span><span class="cx">
</span><span class="cx"> CallData callData;
</span></span></pre></div>
<a id="releasesWebKitGTKwebkit224SourceWTFChangeLog"></a>
<div class="modfile"><h4>Modified: releases/WebKitGTK/webkit-2.24/Source/WTF/ChangeLog (242444 => 242445)</h4>
<pre class="diff"><span>
<span class="info">--- releases/WebKitGTK/webkit-2.24/Source/WTF/ChangeLog 2019-03-05 12:40:47 UTC (rev 242444)
+++ releases/WebKitGTK/webkit-2.24/Source/WTF/ChangeLog 2019-03-05 12:40:50 UTC (rev 242445)
</span><span class="lines">@@ -1,3 +1,32 @@
</span><ins>+2019-02-23 Mark Lam <mark.lam@apple.com>
+
+ Add an exception check and some assertions in StringPrototype.cpp.
+ https://bugs.webkit.org/show_bug.cgi?id=194962
+ <rdar://problem/48013416>
+
+ Reviewed by Yusuke Suzuki and Saam Barati.
+
+ Add an AssertNoOverflow overflow handler which allows us to do CheckedArithmetic
+ for assertion purpose only on debug builds but sacrifices no performance on
+ release builds.
+
+ * wtf/CheckedArithmetic.h:
+ (WTF::AssertNoOverflow::overflowed):
+ (WTF::AssertNoOverflow::clearOverflow):
+ (WTF::AssertNoOverflow::crash):
+ (WTF::AssertNoOverflow::hasOverflowed const):
+ (WTF::observesOverflow):
+ (WTF::observesOverflow<AssertNoOverflow>):
+ (WTF::safeAdd):
+ (WTF::safeSub):
+ (WTF::safeMultiply):
+ (WTF::Checked::operator+=):
+ (WTF::Checked::operator-=):
+ (WTF::Checked::operator*=):
+ (WTF::operator+):
+ (WTF::operator-):
+ (WTF::operator*):
+
</ins><span class="cx"> 2019-02-20 Alex Christensen <achristensen@webkit.org>
</span><span class="cx">
</span><span class="cx"> URL percent-encode operations should use checked arithmetic for buffer allocation length
</span></span></pre></div>
<a id="releasesWebKitGTKwebkit224SourceWTFwtfCheckedArithmetich"></a>
<div class="modfile"><h4>Modified: releases/WebKitGTK/webkit-2.24/Source/WTF/wtf/CheckedArithmetic.h (242444 => 242445)</h4>
<pre class="diff"><span>
<span class="info">--- releases/WebKitGTK/webkit-2.24/Source/WTF/wtf/CheckedArithmetic.h 2019-03-05 12:40:47 UTC (rev 242444)
+++ releases/WebKitGTK/webkit-2.24/Source/WTF/wtf/CheckedArithmetic.h 2019-03-05 12:40:50 UTC (rev 242445)
</span><span class="lines">@@ -1,5 +1,5 @@
</span><span class="cx"> /*
</span><del>- * Copyright (C) 2011-2018 Apple Inc. All rights reserved.
</del><ins>+ * Copyright (C) 2011-2019 Apple Inc. All rights reserved.
</ins><span class="cx"> *
</span><span class="cx"> * Redistribution and use in source and binary forms, with or without
</span><span class="cx"> * modification, are permitted provided that the following conditions
</span><span class="lines">@@ -70,6 +70,24 @@
</span><span class="cx"> DidNotOverflow
</span><span class="cx"> };
</span><span class="cx">
</span><ins>+class AssertNoOverflow {
+public:
+ static NO_RETURN_DUE_TO_ASSERT void overflowed()
+ {
+ ASSERT_NOT_REACHED();
+ }
+
+ void clearOverflow() { }
+
+ static NO_RETURN_DUE_TO_CRASH void crash()
+ {
+ CRASH();
+ }
+
+public:
+ constexpr bool hasOverflowed() const { return false; }
+};
+
</ins><span class="cx"> class ConditionalCrashOnOverflow {
</span><span class="cx"> public:
</span><span class="cx"> void overflowed()
</span><span class="lines">@@ -523,21 +541,55 @@
</span><span class="cx"> }
</span><span class="cx"> };
</span><span class="cx">
</span><ins>+template <class OverflowHandler, typename = std::enable_if_t<!std::is_scalar<OverflowHandler>::value>>
+inline constexpr bool observesOverflow() { return true; }
+
+template <>
+inline constexpr bool observesOverflow<AssertNoOverflow>() { return !ASSERT_DISABLED; }
+
</ins><span class="cx"> template <typename U, typename V, typename R> static inline bool safeAdd(U lhs, V rhs, R& result)
</span><span class="cx"> {
</span><span class="cx"> return ArithmeticOperations<U, V, R>::add(lhs, rhs, result);
</span><ins>+ return true;
</ins><span class="cx"> }
</span><span class="cx">
</span><ins>+template <class OverflowHandler, typename U, typename V, typename R, typename = std::enable_if_t<!std::is_scalar<OverflowHandler>::value>>
+static inline bool safeAdd(U lhs, V rhs, R& result)
+{
+ if (observesOverflow<OverflowHandler>())
+ return safeAdd(lhs, rhs, result);
+ result = lhs + rhs;
+ return true;
+}
+
</ins><span class="cx"> template <typename U, typename V, typename R> static inline bool safeSub(U lhs, V rhs, R& result)
</span><span class="cx"> {
</span><span class="cx"> return ArithmeticOperations<U, V, R>::sub(lhs, rhs, result);
</span><span class="cx"> }
</span><span class="cx">
</span><ins>+template <class OverflowHandler, typename U, typename V, typename R, typename = std::enable_if_t<!std::is_scalar<OverflowHandler>::value>>
+static inline bool safeSub(U lhs, V rhs, R& result)
+{
+ if (observesOverflow<OverflowHandler>())
+ return safeSub(lhs, rhs, result);
+ result = lhs - rhs;
+ return true;
+}
+
</ins><span class="cx"> template <typename U, typename V, typename R> static inline bool safeMultiply(U lhs, V rhs, R& result)
</span><span class="cx"> {
</span><span class="cx"> return ArithmeticOperations<U, V, R>::multiply(lhs, rhs, result);
</span><span class="cx"> }
</span><span class="cx">
</span><ins>+template <class OverflowHandler, typename U, typename V, typename R, typename = std::enable_if_t<!std::is_scalar<OverflowHandler>::value>>
+static inline bool safeMultiply(U lhs, V rhs, R& result)
+{
+ if (observesOverflow<OverflowHandler>())
+ return safeMultiply(lhs, rhs, result);
+ result = lhs * rhs;
+ return true;
+}
+
</ins><span class="cx"> template <typename U, typename V> static inline bool safeEquals(U lhs, V rhs)
</span><span class="cx"> {
</span><span class="cx"> return ArithmeticOperations<U, V>::equals(lhs, rhs);
</span><span class="lines">@@ -676,7 +728,7 @@
</span><span class="cx"> // Mutating assignment
</span><span class="cx"> template <typename U> const Checked operator+=(U rhs)
</span><span class="cx"> {
</span><del>- if (!safeAdd(m_value, rhs, m_value))
</del><ins>+ if (!safeAdd<OverflowHandler>(m_value, rhs, m_value))
</ins><span class="cx"> this->overflowed();
</span><span class="cx"> return *this;
</span><span class="cx"> }
</span><span class="lines">@@ -683,7 +735,7 @@
</span><span class="cx">
</span><span class="cx"> template <typename U> const Checked operator-=(U rhs)
</span><span class="cx"> {
</span><del>- if (!safeSub(m_value, rhs, m_value))
</del><ins>+ if (!safeSub<OverflowHandler>(m_value, rhs, m_value))
</ins><span class="cx"> this->overflowed();
</span><span class="cx"> return *this;
</span><span class="cx"> }
</span><span class="lines">@@ -690,7 +742,7 @@
</span><span class="cx">
</span><span class="cx"> template <typename U> const Checked operator*=(U rhs)
</span><span class="cx"> {
</span><del>- if (!safeMultiply(m_value, rhs, m_value))
</del><ins>+ if (!safeMultiply<OverflowHandler>(m_value, rhs, m_value))
</ins><span class="cx"> this->overflowed();
</span><span class="cx"> return *this;
</span><span class="cx"> }
</span><span class="lines">@@ -814,7 +866,7 @@
</span><span class="cx"> V y = 0;
</span><span class="cx"> bool overflowed = lhs.safeGet(x) == CheckedState::DidOverflow || rhs.safeGet(y) == CheckedState::DidOverflow;
</span><span class="cx"> typename Result<U, V>::ResultType result = 0;
</span><del>- overflowed |= !safeAdd(x, y, result);
</del><ins>+ overflowed |= !safeAdd<OverflowHandler>(x, y, result);
</ins><span class="cx"> if (overflowed)
</span><span class="cx"> return ResultOverflowed;
</span><span class="cx"> return result;
</span><span class="lines">@@ -826,7 +878,7 @@
</span><span class="cx"> V y = 0;
</span><span class="cx"> bool overflowed = lhs.safeGet(x) == CheckedState::DidOverflow || rhs.safeGet(y) == CheckedState::DidOverflow;
</span><span class="cx"> typename Result<U, V>::ResultType result = 0;
</span><del>- overflowed |= !safeSub(x, y, result);
</del><ins>+ overflowed |= !safeSub<OverflowHandler>(x, y, result);
</ins><span class="cx"> if (overflowed)
</span><span class="cx"> return ResultOverflowed;
</span><span class="cx"> return result;
</span><span class="lines">@@ -838,7 +890,7 @@
</span><span class="cx"> V y = 0;
</span><span class="cx"> bool overflowed = lhs.safeGet(x) == CheckedState::DidOverflow || rhs.safeGet(y) == CheckedState::DidOverflow;
</span><span class="cx"> typename Result<U, V>::ResultType result = 0;
</span><del>- overflowed |= !safeMultiply(x, y, result);
</del><ins>+ overflowed |= !safeMultiply<OverflowHandler>(x, y, result);
</ins><span class="cx"> if (overflowed)
</span><span class="cx"> return ResultOverflowed;
</span><span class="cx"> return result;
</span><span class="lines">@@ -930,6 +982,7 @@
</span><span class="cx">
</span><span class="cx"> }
</span><span class="cx">
</span><ins>+using WTF::AssertNoOverflow;
</ins><span class="cx"> using WTF::Checked;
</span><span class="cx"> using WTF::CheckedState;
</span><span class="cx"> using WTF::CheckedInt8;
</span></span></pre>
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