CVE-2024-41932

Summary

In the Linux kernel, the following vulnerability has been resolved:

sched: fix warning in sched_setaffinity

Commit 8f9ea86fdf99b added some logic to sched_setaffinity that included a WARN when a per-task affinity assignment races with a cpuset update.

Specifically, we can have a race where a cpuset update results in the task affinity no longer being a subset of the cpuset. That's fine; we have a fallback to instead use the cpuset mask. However, we have a WARN set up that will trigger if the cpuset mask has no overlap at all with the requested task affinity. This shouldn't be a warning condition; its trivial to create this condition.

Reproduced the warning by the following setup:

• $PID inside a cpuset cgroup
• another thread repeatedly switching the cpuset cpus from 1-2 to just 1
• another thread repeatedly setting the $PID affinity (via taskset) to 2

Affected Software

Weaknesses

References

• https://git.kernel.org/stable/c/5c3fb75f538cfcb886f6dfeb497d99fc2f263ee6
• https://git.kernel.org/stable/c/70ee7947a29029736a1a06c73a48ff37674a851b

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