[Webkit-unassigned] [Bug 109836] New: [JIT] Memory overwrite by Math object functions
bugzilla-daemon at webkit.org
bugzilla-daemon at webkit.org
Thu Feb 14 08:13:19 PST 2013
https://bugs.webkit.org/show_bug.cgi?id=109836
Summary: [JIT] Memory overwrite by Math object functions
Product: WebKit
Version: 528+ (Nightly build)
Platform: Unspecified
OS/Version: Unspecified
Status: UNCONFIRMED
Severity: Normal
Priority: P2
Component: JavaScriptCore
AssignedTo: webkit-unassigned at lists.webkit.org
ReportedBy: w.bielawski at samsung.com
Created an attachment (id=188355)
--> (https://bugs.webkit.org/attachment.cgi?id=188355&action=review)
Callstack of memory overwrite issue
Below functions of Math object causes memory overwrite for big numbers (greater than 2^31) on 32bit platforms (i386, arm)
abs()
ceil()
exp()
floor()
log()
round()
sqrt()
Valgrind reports:
==32656== Thread 1:
==32656== Invalid write of size 8
==32656== at 0x804142B: ???
==32656== by 0x56E30E9: JSC::Interpreter::execute(JSC::ProgramExecutable*, JSC::ExecState*, JSC::JSObject*) (in /home/wojtek/Projekty/webkit/webkit.org/WebKit/WebKitBuild/Release/lib/libewebkit2.so.0.1.0)
==32656== by 0x570F58D: JSC::evaluate(JSC::ExecState*, JSC::SourceCode const&, JSC::JSValue, JSC::JSValue*) (in /home/wojtek/Projekty/webkit/webkit.org/WebKit/WebKitBuild/Release/lib/libewebkit2.so.0.1.0)
==32656== by 0x4C0F210: WebCore::ScriptController::evaluateInWorld(WebCore::ScriptSourceCode const&, WebCore::DOMWrapperWorld*) (in /home/wojtek/Projekty/webkit/webkit.org/WebKit/WebKitBuild/Release/lib/libewebkit2.so.0.1.0)
==32656== by 0xA4A44B7: ???
==32656== Address 0xbeb95b44 is just below the stack ptr. To suppress, use: --workaround-gcc296-bugs=yes
Full gdb backtrace attached.
The issue is not reproducible when JIT is disabled.
Example JavaScript code that causes memory overwrite:
<script>
var x = Math.floor(100000000000000000000000000000000000000000);
</script>
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