crossbeam-utils Race Condition vulnerability with manual fix

[philipjonsen]

crossbeam-utils Race Condition vulnerability ###

Impact The affected version of this crate incorrectly assumed that the alignment of {i,u}64 was always the same as Atomic{I,U}64. However, the alignment of {i,u}64 on a 32-bit target can be smaller than Atomic{I,U}64. This can cause the following problems: - Unaligned memory accesses - Data race Crates using fetch_* methods with AtomicCell<{i,u}64> are affected by this issue. 32-bit targets without Atomic{I,U}64 and 64-bit targets are not affected by this issue. 32-bit targets with Atomic{I,U}64 and {i,u}64 have the same alignment are also not affected by this issue. The following is a complete list of the builtin targets that may be affected.

(last update: nightly-2022-02-11) - armv7-apple-ios (tier 3) - armv7s-apple-ios (tier 3) - i386-apple-ios (tier 3) - i586-unknown-linux-gnu - i586-unknown-linux-musl - i686-apple-darwin (tier 3) - i686-linux-android - i686-unknown-freebsd - i686-unknown-haiku (tier 3) - i686-unknown-linux-gnu - i686-unknown-linux-musl - i686-unknown-netbsd (tier 3) - i686-unknown-openbsd (tier 3) - i686-wrs-vxworks (tier 3)

(script to get list) ### Patches This has been fixed in crossbeam-utils 0.8.7. Affected 0.8.x releases have been yanked. ### References crossbeam-rs/crossbeam#781 ### License This advisory is in the public domain.

Impact :

The affected version of this crate incorrectly assumed that the alignment of {i,u}64 was always the same as Atomic{I,U}64.

However, the alignment of {i,u}64 on a 32-bit target can be smaller than Atomic{I,U}64.

This can cause the following problems:

Unaligned memory accesses
Data race
Crates using fetch_* methods with AtomicCell<{i,u}64> are affected by this issue.

32-bit targets without Atomic{I,U}64 and 64-bit targets are not affected by this issue.
32-bit targets with Atomic{I,U}64 and {i,u}64 have the same alignment are also not affected by this issue.

The following is a complete list of the builtin targets that may be affected. (last update: nightly-2022-02-11)

armv7-apple-ios (tier 3)
armv7s-apple-ios (tier 3)
i386-apple-ios (tier 3)
i586-unknown-linux-gnu
i586-unknown-linux-musl
i686-apple-darwin (tier 3)
i686-linux-android
i686-unknown-freebsd
i686-unknown-haiku (tier 3)
i686-unknown-linux-gnu
i686-unknown-linux-musl
i686-unknown-netbsd (tier 3)
i686-unknown-openbsd (tier 3)
i686-wrs-vxworks (tier 3)
(script to get list)

Patches
This has been fixed in crossbeam-utils 0.8.7.

Affected 0.8.x releases have been yanked.

References
crossbeam-rs/crossbeam#781

License
This advisory is in the public domain.

References
GHSA-qc84-gqf4-9926
https://nvd.nist.gov/vuln/detail/CVE-2022-23639
crossbeam-rs/crossbeam#781
https://github.com/crossbeam-rs/crossbeam/releases/tag/crossbeam-utils-0.8.7
https://rustsec.org/advisories/RUSTSEC-2022-0041.html

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