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crossbeam-rs/crossbeam · Security

crossbeam-utils Unsoundness of AtomicCell<{i,u}64> arithmetics on 32-bit targets that support Atomic{I,U}64

GHSA ID
GHSA-qc84-gqf4-9926
CVE ID
CVE-2022-23639
Severity
high
Published
Updated
CVSS
8.1 · CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS v3
8.1 · CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Description

Impact

The 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)

Patches

This has been fixed in crossbeam-utils 0.8.7.

Affected 0.8.x releases have been yanked.

References

https://github.com/crossbeam-rs/crossbeam/pull/781

License

This advisory is in the public domain.

CWEs

  • CWE-362 · Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')

References

Open GitHub