Bug 124886 – Crash in JSC::ASTBuilder::Expression JSC::Parser<JSC::Lexer<unsigned char> >::parseUnaryExpression<JSC::ASTBuilder>(JSC::ASTBuilder&)

• Component: JavaScriptCore
• Status: RESOLVED FIXED

[Renata Hodovan]

Created attachment 217872 [details]
Test case

The following short expression makes release WebKit crash and causes an assertion failure in the debug version:

1 % +;

====================================

Release backtrace:

1   0x684a5d
2   0x6875f4
3   0x689030
4   0x68b036
5   0x68f43f
6   0x6e7655
7   0x6eaaf0
8   0x452a37
9   0x43ed98
10  0x5bddc0
11  0x43609e
12  0x40c599 jscmain(int, char**)
13  0x40651b main
14  0x7ffff5aef76d __libc_start_main
15  0x406591

Program received signal SIGSEGV, Segmentation fault.
0x0000000000821e49 in WTFCrash ()
(gdb) bt
#0  0x0000000000821e49 in WTFCrash ()
#1  0x0000000000684a5d in JSC::ASTBuilder::Expression JSC::Parser<JSC::Lexer<unsigned char> >::parseAssignmentExpression<JSC::ASTBuilder>(JSC::ASTBuilder&)
    ()
#2  0x00000000006875f4 in JSC::ASTBuilder::Expression JSC::Parser<JSC::Lexer<unsigned char> >::parseExpression<JSC::ASTBuilder>(JSC::ASTBuilder&) ()
#3  0x0000000000689030 in JSC::ASTBuilder::Statement JSC::Parser<JSC::Lexer<unsigned char> >::parseExpressionStatement<JSC::ASTBuilder>(JSC::ASTBuilder&) ()
#4  0x000000000068b036 in JSC::ASTBuilder::Statement JSC::Parser<JSC::Lexer<unsigned char> >::parseStatement<JSC::ASTBuilder>(JSC::ASTBuilder&, JSC::Identifier const*&, unsigned int*) ()
#5  0x000000000068f43f in JSC::Parser<JSC::Lexer<unsigned char> >::parseInner() ()
#6  0x00000000006e7655 in WTF::PassRefPtr<JSC::ProgramNode> JSC::parse<JSC::ProgramNode>(JSC::VM*, JSC::SourceCode const&, JSC::FunctionParameters*, JSC::Identifier const&, JSC::JSParserStrictness, JSC::JSParserMode, JSC::ParserError&, JSC::JSTextPosition*) [clone .constprop.127] ()
#7  0x00000000006eaaf0 in JSC::UnlinkedProgramCodeBlock* JSC::CodeCache::getGlobalCodeBlock<JSC::UnlinkedProgramCodeBlock, JSC::ProgramExecutable>(JSC::VM&, JSC::ProgramExecutable*, JSC::SourceCode const&, JSC::JSParserStrictness, JSC::DebuggerMode, JSC::ProfilerMode, JSC::ParserError&) ()
#8  0x0000000000452a37 in JSC::JSGlobalObject::createProgramCodeBlock(JSC::ExecState*, JSC::ProgramExecutable*, JSC::JSObject**) ()
#9  0x000000000043ed98 in JSC::ProgramExecutable::initializeGlobalProperties(JSC::VM&, JSC::ExecState*, JSC::JSScope*) ()
#10 0x00000000005bddc0 in JSC::Interpreter::execute(JSC::ProgramExecutable*, JSC::ExecState*, JSC::JSObject*) ()
#11 0x000000000043609e in JSC::evaluate(JSC::ExecState*, JSC::SourceCode const&, JSC::JSValue, JSC::JSValue*) ()
#12 0x000000000040c599 in jscmain(int, char**) ()
#13 0x000000000040651b in main ()


====================================

Debug backtrace:

SHOULD NEVER BE REACHED
/home/reni/Data/REPOS/webkit_sec/Source/JavaScriptCore/parser/Parser.cpp(2163) : const char* JSC::operatorString(bool, unsigned int)
1   0x7ffff7508504 WTFCrash
2   0x7ffff73088a3
3   0x7ffff734f45d JSC::ASTBuilder::Expression JSC::Parser<JSC::Lexer<unsigned char> >::parseUnaryExpression<JSC::ASTBuilder>(JSC::ASTBuilder&)
4   0x7ffff734b96b JSC::ASTBuilder::Expression JSC::Parser<JSC::Lexer<unsigned char> >::parseBinaryExpression<JSC::ASTBuilder>(JSC::ASTBuilder&)
5   0x7ffff734399d JSC::ASTBuilder::Expression JSC::Parser<JSC::Lexer<unsigned char> >::parseConditionalExpression<JSC::ASTBuilder>(JSC::ASTBuilder&)
6   0x7ffff7339887 JSC::ASTBuilder::Expression JSC::Parser<JSC::Lexer<unsigned char> >::parseAssignmentExpression<JSC::ASTBuilder>(JSC::ASTBuilder&)
7   0x7ffff732e679 JSC::ASTBuilder::Expression JSC::Parser<JSC::Lexer<unsigned char> >::parseExpression<JSC::ASTBuilder>(JSC::ASTBuilder&)
8   0x7ffff73259fd JSC::ASTBuilder::Statement JSC::Parser<JSC::Lexer<unsigned char> >::parseExpressionStatement<JSC::ASTBuilder>(JSC::ASTBuilder&)
9   0x7ffff731dfb9 JSC::ASTBuilder::Statement JSC::Parser<JSC::Lexer<unsigned char> >::parseStatement<JSC::ASTBuilder>(JSC::ASTBuilder&, JSC::Identifier const*&, unsigned int*)
10  0x7ffff731b450 JSC::ASTBuilder::SourceElements JSC::Parser<JSC::Lexer<unsigned char> >::parseSourceElements<(JSC::SourceElementsMode)0, JSC::ASTBuilder>(JSC::ASTBuilder&)
11  0x7ffff7315019 JSC::Parser<JSC::Lexer<unsigned char> >::parseInner()
12  0x7ffff702d35f WTF::PassRefPtr<JSC::ProgramNode> JSC::Parser<JSC::Lexer<unsigned char> >::parse<JSC::ProgramNode>(JSC::ParserError&)
13  0x7ffff702cf69 WTF::PassRefPtr<JSC::ProgramNode> JSC::parse<JSC::ProgramNode>(JSC::VM*, JSC::SourceCode const&, JSC::FunctionParameters*, JSC::Identifier const&, JSC::JSParserStrictness, JSC::JSParserMode, JSC::ParserError&, JSC::JSTextPosition*)
14  0x7ffff73bc20a JSC::UnlinkedProgramCodeBlock* JSC::CodeCache::getGlobalCodeBlock<JSC::UnlinkedProgramCodeBlock, JSC::ProgramExecutable>(JSC::VM&, JSC::ProgramExecutable*, JSC::SourceCode const&, JSC::JSParserStrictness, JSC::DebuggerMode, JSC::ProfilerMode, JSC::ParserError&)
15  0x7ffff73ba873 JSC::CodeCache::getProgramCodeBlock(JSC::VM&, JSC::ProgramExecutable*, JSC::SourceCode const&, JSC::JSParserStrictness, JSC::DebuggerMode, JSC::ProfilerMode, JSC::ParserError&)
16  0x7ffff7401ebd JSC::JSGlobalObject::createProgramCodeBlock(JSC::ExecState*, JSC::ProgramExecutable*, JSC::JSObject**)
17  0x7ffff73d4065 JSC::ProgramExecutable::initializeGlobalProperties(JSC::VM&, JSC::ExecState*, JSC::JSScope*)
18  0x7ffff72a0386 JSC::Interpreter::execute(JSC::ProgramExecutable*, JSC::ExecState*, JSC::JSObject*)
19  0x7ffff73c7324 JSC::evaluate(JSC::ExecState*, JSC::SourceCode const&, JSC::JSValue, JSC::JSValue*)
20  0x4163a0
21  0x41716f jscmain(int, char**)
22  0x41618c main
23  0x7ffff5b8d76d __libc_start_main
24  0x414c99

Program received signal SIGSEGV, Segmentation fault.
0x00007ffff7508509 in WTFCrash () at /home/reni/Data/REPOS/webkit_sec/Source/WTF/wtf/Assertions.cpp:341
341	    *(int *)(uintptr_t)0xbbadbeef = 0;
(gdb) bt
#0  0x00007ffff7508509 in WTFCrash () at /home/reni/Data/REPOS/webkit_sec/Source/WTF/wtf/Assertions.cpp:341
#1  0x00007ffff73088a3 in JSC::operatorString (prefix=true, tok=39250) at /home/reni/Data/REPOS/webkit_sec/Source/JavaScriptCore/parser/Parser.cpp:2163
#2  0x00007ffff734f45d in JSC::Parser<JSC::Lexer<unsigned char> >::parseUnaryExpression<JSC::ASTBuilder> (this=0x7fffffffadc0, context=...)
    at /home/reni/Data/REPOS/webkit_sec/Source/JavaScriptCore/parser/Parser.cpp:2208
#3  0x00007ffff734b96b in JSC::Parser<JSC::Lexer<unsigned char> >::parseBinaryExpression<JSC::ASTBuilder> (this=0x7fffffffadc0, context=...)
    at /home/reni/Data/REPOS/webkit_sec/Source/JavaScriptCore/parser/Parser.cpp:1639
#4  0x00007ffff734399d in JSC::Parser<JSC::Lexer<unsigned char> >::parseConditionalExpression<JSC::ASTBuilder> (this=0x7fffffffadc0, context=...)
    at /home/reni/Data/REPOS/webkit_sec/Source/JavaScriptCore/parser/Parser.cpp:1599
#5  0x00007ffff7339887 in JSC::Parser<JSC::Lexer<unsigned char> >::parseAssignmentExpression<JSC::ASTBuilder> (this=0x7fffffffadc0, context=...)
    at /home/reni/Data/REPOS/webkit_sec/Source/JavaScriptCore/parser/Parser.cpp:1533
#6  0x00007ffff732e679 in JSC::Parser<JSC::Lexer<unsigned char> >::parseExpression<JSC::ASTBuilder> (this=0x7fffffffadc0, context=...)
    at /home/reni/Data/REPOS/webkit_sec/Source/JavaScriptCore/parser/Parser.cpp:1496
#7  0x00007ffff73259fd in JSC::Parser<JSC::Lexer<unsigned char> >::parseExpressionStatement<JSC::ASTBuilder> (this=0x7fffffffadc0, context=...)
    at /home/reni/Data/REPOS/webkit_sec/Source/JavaScriptCore/parser/Parser.cpp:1401
#8  0x00007ffff731dfb9 in JSC::Parser<JSC::Lexer<unsigned char> >::parseStatement<JSC::ASTBuilder> (this=0x7fffffffadc0, context=..., 
    directive=@0x7fffffffa498: 0x0, directiveLiteralLength=0x7fffffffa4b4) at /home/reni/Data/REPOS/webkit_sec/Source/JavaScriptCore/parser/Parser.cpp:1135
#9  0x00007ffff731b450 in JSC::Parser<JSC::Lexer<unsigned char> >::parseSourceElements<(JSC::SourceElementsMode)0, JSC::ASTBuilder> (this=0x7fffffffadc0, 
    context=...) at /home/reni/Data/REPOS/webkit_sec/Source/JavaScriptCore/parser/Parser.cpp:300
#10 0x00007ffff7315019 in JSC::Parser<JSC::Lexer<unsigned char> >::parseInner (this=0x7fffffffadc0)
    at /home/reni/Data/REPOS/webkit_sec/Source/JavaScriptCore/parser/Parser.cpp:247
#11 0x00007ffff702d35f in JSC::Parser<JSC::Lexer<unsigned char> >::parse<JSC::ProgramNode> (this=0x7fffffffadc0, error=...)
    at /home/reni/Data/REPOS/webkit_sec/Source/JavaScriptCore/parser/Parser.h:887
#12 0x00007ffff702cf69 in JSC::parse<JSC::ProgramNode> (vm=0x6464e0, source=..., parameters=0x0, name=..., strictness=JSC::JSParseNormal, 
    parserMode=JSC::JSParseProgramCode, error=..., positionBeforeLastNewline=0x0)
    at /home/reni/Data/REPOS/webkit_sec/Source/JavaScriptCore/parser/Parser.h:957
#13 0x00007ffff73bc20a in JSC::CodeCache::getGlobalCodeBlock<JSC::UnlinkedProgramCodeBlock, JSC::ProgramExecutable> (this=0x657340, vm=..., 
    executable=0x7fffa992fef0, source=..., strictness=JSC::JSParseNormal, debuggerMode=JSC::DebuggerOff, profilerMode=JSC::ProfilerOff, error=...)
    at /home/reni/Data/REPOS/webkit_sec/Source/JavaScriptCore/runtime/CodeCache.cpp:95
#14 0x00007ffff73ba873 in JSC::CodeCache::getProgramCodeBlock (this=0x657340, vm=..., executable=0x7fffa992fef0, source=..., strictness=JSC::JSParseNormal, 
    debuggerMode=JSC::DebuggerOff, profilerMode=JSC::ProfilerOff, error=...)
    at /home/reni/Data/REPOS/webkit_sec/Source/JavaScriptCore/runtime/CodeCache.cpp:129
#15 0x00007ffff7401ebd in JSC::JSGlobalObject::createProgramCodeBlock (this=0x7fffa99ff970, callFrame=0x7fffa99ff9b0, executable=0x7fffa992fef0, 
    exception=0x7fffffffc660) at /home/reni/Data/REPOS/webkit_sec/Source/JavaScriptCore/runtime/JSGlobalObject.cpp:731
#16 0x00007ffff73d4065 in JSC::ProgramExecutable::initializeGlobalProperties (this=0x7fffa992fef0, vm=..., callFrame=0x7fffa99ff9b0, scope=0x7fffa99ff970)
    at /home/reni/Data/REPOS/webkit_sec/Source/JavaScriptCore/runtime/Executable.cpp:463
#17 0x00007ffff72a0386 in JSC::Interpreter::execute (this=0x6573d0, program=0x7fffa992fef0, callFrame=0x7fffa99ff9b0, thisObj=0x7fffa98cfeb0)
    at /home/reni/Data/REPOS/webkit_sec/Source/JavaScriptCore/interpreter/Interpreter.cpp:850
#18 0x00007ffff73c7324 in JSC::evaluate (exec=0x7fffa99ff9b0, source=..., thisValue=..., returnedException=0x7fffffffdbb0)
    at /home/reni/Data/REPOS/webkit_sec/Source/JavaScriptCore/runtime/Completion.cpp:83
#19 0x00000000004163a0 in runWithScripts (globalObject=0x7fffa99ff970, scripts=..., dump=false)
    at /home/reni/Data/REPOS/webkit_sec/Source/JavaScriptCore/jsc.cpp:646
#20 0x000000000041716f in jscmain (argc=2, argv=0x7fffffffde58) at /home/reni/Data/REPOS/webkit_sec/Source/JavaScriptCore/jsc.cpp:863
#21 0x000000000041618c in main (argc=2, argv=0x7fffffffde58) at /home/reni/Data/REPOS/webkit_sec/Source/JavaScriptCore/jsc.cpp:604

[Oliver Hunt]

Looking at this.  I've probably created a bogus fall through when adding error messages

[Oliver Hunt]

Created attachment 217894 [details]
Patch

[Sam Weinig]

Comment on attachment 217894 [details]
Patch

View in context: https://bugs.webkit.org/attachment.cgi?id=217894&action=review

> Source/JavaScriptCore/parser/Parser.cpp:42
> +    propagateError();\

We usually put a space before the \.

[Oliver Hunt]

Committed r159790: <http://trac.webkit.org/changeset/159790>