Branch: refs/heads/main
Home: https://github.com/WebKit/WebKit
Commit: 4a35ca3f1e129f50ea7eca5ca070432c7d29347a
https://github.com/WebKit/WebKit/commit/4a35ca3f1e129f50ea7eca5ca070432c7d29347a
Author: Yusuke Suzuki <[email protected]>
Date: 2022-12-20 (Tue, 20 Dec 2022)
Changed paths:
A JSTests/stress/resizable-array-buffer-last-index-of.js
M Source/JavaScriptCore/runtime/JSGenericTypedArrayViewPrototypeFunctions.h
Log Message:
-----------
[JSC] Fix ResizableArrayBuffer + lastIndexOf
https://bugs.webkit.org/show_bug.cgi?id=249676
rdar://103531814
Reviewed by Justin Michaud.
When evaluating the valueOf of the input, resizable arraybuffer can get 0
length, thus,
we need to assume that length can become zero. This patch fixes this crash
issue.
This is actually not a security issue because of how resizable arraybuffer is
designed:
it reserves maximum size VM region and use mprotect to allow access based on
the current
size. So, only possible outcome here is crash.
* JSTests/stress/resizable-array-buffer-last-index-of.js: Added.
(evil.valueOf):
* Source/JavaScriptCore/runtime/JSGenericTypedArrayViewPrototypeFunctions.h:
(JSC::genericTypedArrayViewProtoFuncLastIndexOf):
Canonical link: https://commits.webkit.org/258164@main
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