RUSTSEC-2022-0041

Unsoundness of AtomicCell<*64> arithmetics on 32-bit targets that support Atomic*64

## Impact Affected versions 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](https://gist.github.com/taiki-e/3c7891e8c5f5e0cbcb44d7396aabfe10)) ## Patches This has been fixed in crossbeam-utils 0.8.7. Affected 0.8.x releases have been yanked. Thanks to [@taiki-e](https://github.com/taiki-e).