Branch: refs/heads/webkitglib/2.42
Home: https://github.com/WebKit/WebKit
Commit: 00352dd86bfa102b6e4b792120e3ef3498a27d1e
https://github.com/WebKit/WebKit/commit/00352dd86bfa102b6e4b792120e3ef3498a27d1e
Author: Russell Epstein <[email protected]>
Date: 2023-12-01 (Fri, 01 Dec 2023)
Changed paths:
M Source/JavaScriptCore/runtime/Structure.cpp
Log Message:
-----------
Cherry-pick b0a755e34426. https://bugs.webkit.org/show_bug.cgi?id=265067
Race condition between JSObject::getDirectConcurrently users and
Structure::flattenDictionaryStructure
https://bugs.webkit.org/show_bug.cgi?id=265067
rdar://118548733
Reviewed by Justin Michaud and Mark Lam.
Like Array shift/unshift, flattenDictionaryStructure is the other code
which can shrink butterfly for named properties (no other code does it).
Compiler threads rely on the fact that normally named property storage
never shrunk. And we should catch this exceptional case by taking a cellLock
in the compiler thread. But flattenDictionaryStructure is not taking
cellLock correctly.
This patch computes afterOutOfLineCapacity first to detect that whether
this flattening will shrink the butterfly.
And if it is, then we take a cellLock. We do not need to take it if we do
not shrink the butterfly.
* Source/JavaScriptCore/runtime/Structure.cpp:
(JSC::Structure::flattenDictionaryStructure):
Canonical link: https://commits.webkit.org/267815.577@safari-7617-branch
Canonical link:
https://commits.webkit.org/[email protected]
Commit: 64c92ce9b94f1e6f8a132b41ea4dff3aa5c31ad1
https://github.com/WebKit/WebKit/commit/64c92ce9b94f1e6f8a132b41ea4dff3aa5c31ad1
Author: Russell Epstein <[email protected]>
Date: 2023-12-01 (Fri, 01 Dec 2023)
Changed paths:
M Source/JavaScriptCore/b3/B3LowerToAir.cpp
M Source/JavaScriptCore/b3/air/AirValidate.cpp
Log Message:
-----------
Cherry-pick 49ba637c4abb. <bug>
Extr can overflow when imm=64, allowing a random register to be read
rdar://118515062
Reviewed by Yusuke Suzuki.
Extr can overflow when imm=64, allowing a random register to be read.
* Source/JavaScriptCore/b3/B3LowerToAir.cpp:
* Source/JavaScriptCore/b3/air/AirValidate.cpp:
Canonical link: https://commits.webkit.org/267815.574@safari-7617-branch
Canonical link:
https://commits.webkit.org/[email protected]
Compare: https://github.com/WebKit/WebKit/compare/44aeb48d175d...64c92ce9b94f
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