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<dl class="meta">
<dt>Revision</dt> <dd><a href="http://trac.webkit.org/projects/webkit/changeset/168191">168191</a></dd>
<dt>Author</dt> <dd>matthew_hanson@apple.com</dd>
<dt>Date</dt> <dd>2014-05-02 14:28:55 -0700 (Fri, 02 May 2014)</dd>
</dl>
<h3>Log Message</h3>
<pre>Merge <a href="http://trac.webkit.org/projects/webkit/changeset/167336">r167336</a>.</pre>
<h3>Modified Paths</h3>
<ul>
<li><a href="#branchessafari53776branchSourceJavaScriptCoreChangeLog">branches/safari-537.76-branch/Source/JavaScriptCore/ChangeLog</a></li>
<li><a href="#branchessafari53776branchSourceJavaScriptCoredfgDFGOperationscpp">branches/safari-537.76-branch/Source/JavaScriptCore/dfg/DFGOperations.cpp</a></li>
<li><a href="#branchessafari53776branchSourceJavaScriptCoredfgDFGSpeculativeJITcpp">branches/safari-537.76-branch/Source/JavaScriptCore/dfg/DFGSpeculativeJIT.cpp</a></li>
<li><a href="#branchessafari53776branchSourceJavaScriptCoreruntimeJSStringcpp">branches/safari-537.76-branch/Source/JavaScriptCore/runtime/JSString.cpp</a></li>
<li><a href="#branchessafari53776branchSourceJavaScriptCoreruntimeJSStringh">branches/safari-537.76-branch/Source/JavaScriptCore/runtime/JSString.h</a></li>
<li><a href="#branchessafari53776branchSourceJavaScriptCoreruntimeOperationsh">branches/safari-537.76-branch/Source/JavaScriptCore/runtime/Operations.h</a></li>
<li><a href="#branchessafari53776branchSourceJavaScriptCoreruntimeStringPrototypecpp">branches/safari-537.76-branch/Source/JavaScriptCore/runtime/StringPrototype.cpp</a></li>
</ul>
</div>
<div id="patch">
<h3>Diff</h3>
<a id="branchessafari53776branchSourceJavaScriptCoreChangeLog"></a>
<div class="modfile"><h4>Modified: branches/safari-537.76-branch/Source/JavaScriptCore/ChangeLog (168190 => 168191)</h4>
<pre class="diff"><span>
<span class="info">--- branches/safari-537.76-branch/Source/JavaScriptCore/ChangeLog 2014-05-02 21:24:54 UTC (rev 168190)
+++ branches/safari-537.76-branch/Source/JavaScriptCore/ChangeLog 2014-05-02 21:28:55 UTC (rev 168191)
</span><span class="lines">@@ -1,3 +1,50 @@
</span><ins>+2014-05-02 Matthew Hanson <matthew_hanson@apple.com>
+
+ Merge r167336.
+
+ 2014-04-15 Filip Pizlo <fpizlo@apple.com>
+
+ compileMakeRope does not emit necessary bounds checks
+ https://bugs.webkit.org/show_bug.cgi?id=130684
+ <rdar://problem/16398388>
+
+ Reviewed by Oliver Hunt.
+
+ Add string length bounds checks in a bunch of places. We should never allow a string
+ to have a length greater than 2^31-1 because it's not clear that the language has
+ semantics for it and because there is code that assumes that this cannot happen.
+
+ Also add a bunch of tests to that effect to cover the various ways in which this was
+ previously allowed to happen.
+
+ * dfg/DFGOperations.cpp:
+ * dfg/DFGSpeculativeJIT.cpp:
+ (JSC::DFG::SpeculativeJIT::compileMakeRope):
+ * ftl/FTLLowerDFGToLLVM.cpp:
+ (JSC::FTL::LowerDFGToLLVM::compileMakeRope):
+ * runtime/JSString.cpp:
+ (JSC::JSRopeString::RopeBuilder::expand):
+ * runtime/JSString.h:
+ (JSC::JSString::create):
+ (JSC::JSRopeString::RopeBuilder::append):
+ (JSC::JSRopeString::RopeBuilder::release):
+ (JSC::JSRopeString::append):
+ * runtime/Operations.h:
+ (JSC::jsString):
+ (JSC::jsStringFromRegisterArray):
+ (JSC::jsStringFromArguments):
+ * runtime/StringPrototype.cpp:
+ (JSC::stringProtoFuncIndexOf):
+ (JSC::stringProtoFuncSlice):
+ (JSC::stringProtoFuncSubstring):
+ (JSC::stringProtoFuncToLowerCase):
+ * tests/stress/make-large-string-jit-strcat.js: Added.
+ (foo):
+ * tests/stress/make-large-string-jit.js: Added.
+ (foo):
+ * tests/stress/make-large-string-strcat.js: Added.
+ * tests/stress/make-large-string.js: Added.
+
</ins><span class="cx"> 2014-03-19 Matthew Hanson <matthew_hanson@apple.com>
</span><span class="cx">
</span><span class="cx"> Merge r165902.
</span></span></pre></div>
<a id="branchessafari53776branchSourceJavaScriptCoredfgDFGOperationscpp"></a>
<div class="modfile"><h4>Modified: branches/safari-537.76-branch/Source/JavaScriptCore/dfg/DFGOperations.cpp (168190 => 168191)</h4>
<pre class="diff"><span>
<span class="info">--- branches/safari-537.76-branch/Source/JavaScriptCore/dfg/DFGOperations.cpp 2014-05-02 21:24:54 UTC (rev 168190)
+++ branches/safari-537.76-branch/Source/JavaScriptCore/dfg/DFGOperations.cpp 2014-05-02 21:28:55 UTC (rev 168191)
</span><span class="lines">@@ -1596,6 +1596,11 @@
</span><span class="cx"> {
</span><span class="cx"> VM& vm = exec->vm();
</span><span class="cx"> NativeCallFrameTracer tracer(&vm, exec);
</span><ins>+
+ if (static_cast<int32_t>(left->length() + right->length()) < 0) {
+ throwOutOfMemoryError(exec);
+ return 0;
+ }
</ins><span class="cx">
</span><span class="cx"> return JSRopeString::create(vm, left, right);
</span><span class="cx"> }
</span><span class="lines">@@ -1605,6 +1610,14 @@
</span><span class="cx"> VM& vm = exec->vm();
</span><span class="cx"> NativeCallFrameTracer tracer(&vm, exec);
</span><span class="cx">
</span><ins>+ Checked<int32_t, RecordOverflow> length = a->length();
+ length += b->length();
+ length += c->length();
+ if (length.hasOverflowed()) {
+ throwOutOfMemoryError(exec);
+ return 0;
+ }
+
</ins><span class="cx"> return JSRopeString::create(vm, a, b, c);
</span><span class="cx"> }
</span><span class="cx">
</span></span></pre></div>
<a id="branchessafari53776branchSourceJavaScriptCoredfgDFGSpeculativeJITcpp"></a>
<div class="modfile"><h4>Modified: branches/safari-537.76-branch/Source/JavaScriptCore/dfg/DFGSpeculativeJIT.cpp (168190 => 168191)</h4>
<pre class="diff"><span>
<span class="info">--- branches/safari-537.76-branch/Source/JavaScriptCore/dfg/DFGSpeculativeJIT.cpp 2014-05-02 21:24:54 UTC (rev 168190)
+++ branches/safari-537.76-branch/Source/JavaScriptCore/dfg/DFGSpeculativeJIT.cpp 2014-05-02 21:28:55 UTC (rev 168191)
</span><span class="lines">@@ -3198,12 +3198,28 @@
</span><span class="cx"> m_jit.storePtr(TrustedImmPtr(0), JITCompiler::Address(resultGPR, JSRopeString::offsetOfFibers() + sizeof(WriteBarrier<JSString>) * i));
</span><span class="cx"> m_jit.load32(JITCompiler::Address(opGPRs[0], JSString::offsetOfFlags()), scratchGPR);
</span><span class="cx"> m_jit.load32(JITCompiler::Address(opGPRs[0], JSString::offsetOfLength()), allocatorGPR);
</span><ins>+ if (!ASSERT_DISABLED) {
+ JITCompiler::Jump ok = m_jit.branch32(
+ JITCompiler::GreaterThanOrEqual, allocatorGPR, TrustedImm32(0));
+ m_jit.breakpoint();
+ ok.link(&m_jit);
+ }
</ins><span class="cx"> for (unsigned i = 1; i < numOpGPRs; ++i) {
</span><span class="cx"> m_jit.and32(JITCompiler::Address(opGPRs[i], JSString::offsetOfFlags()), scratchGPR);
</span><del>- m_jit.add32(JITCompiler::Address(opGPRs[i], JSString::offsetOfLength()), allocatorGPR);
</del><ins>+ speculationCheck(
+ Uncountable, JSValueSource(), nullptr,
+ m_jit.branchAdd32(
+ JITCompiler::Overflow,
+ JITCompiler::Address(opGPRs[i], JSString::offsetOfLength()), allocatorGPR));
</ins><span class="cx"> }
</span><span class="cx"> m_jit.and32(JITCompiler::TrustedImm32(JSString::Is8Bit), scratchGPR);
</span><span class="cx"> m_jit.store32(scratchGPR, JITCompiler::Address(resultGPR, JSString::offsetOfFlags()));
</span><ins>+ if (!ASSERT_DISABLED) {
+ JITCompiler::Jump ok = m_jit.branch32(
+ JITCompiler::GreaterThanOrEqual, allocatorGPR, TrustedImm32(0));
+ m_jit.breakpoint();
+ ok.link(&m_jit);
+ }
</ins><span class="cx"> m_jit.store32(allocatorGPR, JITCompiler::Address(resultGPR, JSString::offsetOfLength()));
</span><span class="cx">
</span><span class="cx"> switch (numOpGPRs) {
</span></span></pre></div>
<a id="branchessafari53776branchSourceJavaScriptCoreruntimeJSStringcpp"></a>
<div class="modfile"><h4>Modified: branches/safari-537.76-branch/Source/JavaScriptCore/runtime/JSString.cpp (168190 => 168191)</h4>
<pre class="diff"><span>
<span class="info">--- branches/safari-537.76-branch/Source/JavaScriptCore/runtime/JSString.cpp 2014-05-02 21:24:54 UTC (rev 168190)
+++ branches/safari-537.76-branch/Source/JavaScriptCore/runtime/JSString.cpp 2014-05-02 21:28:55 UTC (rev 168191)
</span><span class="lines">@@ -40,6 +40,7 @@
</span><span class="cx"> {
</span><span class="cx"> ASSERT(m_index == JSRopeString::s_maxInternalRopeLength);
</span><span class="cx"> JSString* jsString = m_jsString;
</span><ins>+ RELEASE_ASSERT(jsString);
</ins><span class="cx"> m_jsString = jsStringBuilder(&m_vm);
</span><span class="cx"> m_index = 0;
</span><span class="cx"> append(jsString);
</span></span></pre></div>
<a id="branchessafari53776branchSourceJavaScriptCoreruntimeJSStringh"></a>
<div class="modfile"><h4>Modified: branches/safari-537.76-branch/Source/JavaScriptCore/runtime/JSString.h (168190 => 168191)</h4>
<pre class="diff"><span>
<span class="info">--- branches/safari-537.76-branch/Source/JavaScriptCore/runtime/JSString.h 2014-05-02 21:24:54 UTC (rev 168190)
+++ branches/safari-537.76-branch/Source/JavaScriptCore/runtime/JSString.h 2014-05-02 21:28:55 UTC (rev 168191)
</span><span class="lines">@@ -1,7 +1,7 @@
</span><span class="cx"> /*
</span><span class="cx"> * Copyright (C) 1999-2001 Harri Porten (porten@kde.org)
</span><span class="cx"> * Copyright (C) 2001 Peter Kelly (pmk@post.com)
</span><del>- * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008 Apple Inc. All rights reserved.
</del><ins>+ * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2014 Apple Inc. All rights reserved.
</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">@@ -121,7 +121,8 @@
</span><span class="cx"> static JSString* create(VM& vm, PassRefPtr<StringImpl> value)
</span><span class="cx"> {
</span><span class="cx"> ASSERT(value);
</span><del>- size_t length = value->length();
</del><ins>+ int32_t length = value->length();
+ RELEASE_ASSERT(length >= 0);
</ins><span class="cx"> size_t cost = value->cost();
</span><span class="cx"> JSString* newString = new (NotNull, allocateCell<JSString>(vm.heap)) JSString(vm, value);
</span><span class="cx"> newString->finishCreation(vm, length, cost);
</span><span class="lines">@@ -226,15 +227,21 @@
</span><span class="cx"> {
</span><span class="cx"> }
</span><span class="cx">
</span><del>- void append(JSString* jsString)
</del><ins>+ bool append(JSString* jsString)
</ins><span class="cx"> {
</span><span class="cx"> if (m_index == JSRopeString::s_maxInternalRopeLength)
</span><span class="cx"> expand();
</span><ins>+ if (static_cast<int32_t>(m_jsString->length() + jsString->length()) < 0) {
+ m_jsString = 0;
+ return false;
+ }
</ins><span class="cx"> m_jsString->append(m_vm, m_index++, jsString);
</span><ins>+ return true;
</ins><span class="cx"> }
</span><span class="cx">
</span><span class="cx"> JSRopeString* release()
</span><span class="cx"> {
</span><ins>+ RELEASE_ASSERT(m_jsString);
</ins><span class="cx"> JSRopeString* tmp = m_jsString;
</span><span class="cx"> m_jsString = 0;
</span><span class="cx"> return tmp;
</span><span class="lines">@@ -284,6 +291,7 @@
</span><span class="cx"> {
</span><span class="cx"> m_fibers[index].set(vm, this, jsString);
</span><span class="cx"> m_length += jsString->m_length;
</span><ins>+ RELEASE_ASSERT(static_cast<int32_t>(m_length) >= 0);
</ins><span class="cx"> setIs8Bit(is8Bit() && jsString->is8Bit());
</span><span class="cx"> }
</span><span class="cx">
</span></span></pre></div>
<a id="branchessafari53776branchSourceJavaScriptCoreruntimeOperationsh"></a>
<div class="modfile"><h4>Modified: branches/safari-537.76-branch/Source/JavaScriptCore/runtime/Operations.h (168190 => 168191)</h4>
<pre class="diff"><span>
<span class="info">--- branches/safari-537.76-branch/Source/JavaScriptCore/runtime/Operations.h 2014-05-02 21:24:54 UTC (rev 168190)
+++ branches/safari-537.76-branch/Source/JavaScriptCore/runtime/Operations.h 2014-05-02 21:28:55 UTC (rev 168191)
</span><span class="lines">@@ -41,13 +41,13 @@
</span><span class="cx"> {
</span><span class="cx"> VM& vm = exec->vm();
</span><span class="cx">
</span><del>- unsigned length1 = s1->length();
</del><ins>+ int32_t length1 = s1->length();
</ins><span class="cx"> if (!length1)
</span><span class="cx"> return s2;
</span><del>- unsigned length2 = s2->length();
</del><ins>+ int32_t length2 = s2->length();
</ins><span class="cx"> if (!length2)
</span><span class="cx"> return s1;
</span><del>- if ((length1 + length2) < length1)
</del><ins>+ if ((length1 + length2) < 0)
</ins><span class="cx"> return throwOutOfMemoryError(exec);
</span><span class="cx">
</span><span class="cx"> return JSRopeString::create(vm, s1, s2);
</span><span class="lines">@@ -57,9 +57,13 @@
</span><span class="cx"> {
</span><span class="cx"> VM* vm = &exec->vm();
</span><span class="cx">
</span><del>- unsigned length1 = u1.length();
- unsigned length2 = u2.length();
- unsigned length3 = u3.length();
</del><ins>+ int32_t length1 = u1.length();
+ int32_t length2 = u2.length();
+ int32_t length3 = u3.length();
+
+ if (length1 < 0 || length2 < 0 || length3 < 0)
+ return throwOutOfMemoryError(exec);
+
</ins><span class="cx"> if (!length1)
</span><span class="cx"> return jsString(exec, jsString(vm, u2), jsString(vm, u3));
</span><span class="cx"> if (!length2)
</span><span class="lines">@@ -67,9 +71,9 @@
</span><span class="cx"> if (!length3)
</span><span class="cx"> return jsString(exec, jsString(vm, u1), jsString(vm, u2));
</span><span class="cx">
</span><del>- if ((length1 + length2) < length1)
</del><ins>+ if ((length1 + length2) < 0)
</ins><span class="cx"> return throwOutOfMemoryError(exec);
</span><del>- if ((length1 + length2 + length3) < length3)
</del><ins>+ if ((length1 + length2 + length3) < 0)
</ins><span class="cx"> return throwOutOfMemoryError(exec);
</span><span class="cx">
</span><span class="cx"> return JSRopeString::create(exec->vm(), jsString(vm, u1), jsString(vm, u2), jsString(vm, u3));
</span><span class="lines">@@ -80,15 +84,10 @@
</span><span class="cx"> VM* vm = &exec->vm();
</span><span class="cx"> JSRopeString::RopeBuilder ropeBuilder(*vm);
</span><span class="cx">
</span><del>- unsigned oldLength = 0;
-
</del><span class="cx"> for (unsigned i = 0; i < count; ++i) {
</span><span class="cx"> JSValue v = strings[i].jsValue();
</span><del>- ropeBuilder.append(v.toString(exec));
-
- if (ropeBuilder.length() < oldLength) // True for overflow
</del><ins>+ if (!ropeBuilder.append(v.toString(exec)))
</ins><span class="cx"> return throwOutOfMemoryError(exec);
</span><del>- oldLength = ropeBuilder.length();
</del><span class="cx"> }
</span><span class="cx">
</span><span class="cx"> return ropeBuilder.release();
</span><span class="lines">@@ -100,15 +99,10 @@
</span><span class="cx"> JSRopeString::RopeBuilder ropeBuilder(*vm);
</span><span class="cx"> ropeBuilder.append(thisValue.toString(exec));
</span><span class="cx">
</span><del>- unsigned oldLength = 0;
-
</del><span class="cx"> for (unsigned i = 0; i < exec->argumentCount(); ++i) {
</span><span class="cx"> JSValue v = exec->argument(i);
</span><del>- ropeBuilder.append(v.toString(exec));
-
- if (ropeBuilder.length() < oldLength) // True for overflow
</del><ins>+ if (!ropeBuilder.append(v.toString(exec)))
</ins><span class="cx"> return throwOutOfMemoryError(exec);
</span><del>- oldLength = ropeBuilder.length();
</del><span class="cx"> }
</span><span class="cx">
</span><span class="cx"> return ropeBuilder.release();
</span></span></pre></div>
<a id="branchessafari53776branchSourceJavaScriptCoreruntimeStringPrototypecpp"></a>
<div class="modfile"><h4>Modified: branches/safari-537.76-branch/Source/JavaScriptCore/runtime/StringPrototype.cpp (168190 => 168191)</h4>
<pre class="diff"><span>
<span class="info">--- branches/safari-537.76-branch/Source/JavaScriptCore/runtime/StringPrototype.cpp 2014-05-02 21:24:54 UTC (rev 168190)
+++ branches/safari-537.76-branch/Source/JavaScriptCore/runtime/StringPrototype.cpp 2014-05-02 21:28:55 UTC (rev 168191)
</span><span class="lines">@@ -761,6 +761,7 @@
</span><span class="cx"> else {
</span><span class="cx"> unsigned pos;
</span><span class="cx"> int len = s.length();
</span><ins>+ RELEASE_ASSERT(len >= 0);
</ins><span class="cx"> if (a1.isUInt32())
</span><span class="cx"> pos = std::min<uint32_t>(a1.asUInt32(), len);
</span><span class="cx"> else {
</span><span class="lines">@@ -904,6 +905,7 @@
</span><span class="cx"> return throwVMTypeError(exec);
</span><span class="cx"> String s = thisValue.toString(exec)->value(exec);
</span><span class="cx"> int len = s.length();
</span><ins>+ RELEASE_ASSERT(len >= 0);
</ins><span class="cx">
</span><span class="cx"> JSValue a0 = exec->argument(0);
</span><span class="cx"> JSValue a1 = exec->argument(1);
</span><span class="lines">@@ -1216,6 +1218,7 @@
</span><span class="cx"> JSValue a0 = exec->argument(0);
</span><span class="cx"> JSValue a1 = exec->argument(1);
</span><span class="cx"> int len = jsString->length();
</span><ins>+ RELEASE_ASSERT(len >= 0);
</ins><span class="cx">
</span><span class="cx"> double start = a0.toNumber(exec);
</span><span class="cx"> double end;
</span><span class="lines">@@ -1253,6 +1256,7 @@
</span><span class="cx"> int sSize = s.length();
</span><span class="cx"> if (!sSize)
</span><span class="cx"> return JSValue::encode(sVal);
</span><ins>+ RELEASE_ASSERT(sSize >= 0);
</ins><span class="cx">
</span><span class="cx"> StringImpl* ourImpl = s.impl();
</span><span class="cx"> RefPtr<StringImpl> lower = ourImpl->lower();
</span></span></pre>
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