UBUNTU-CVE-2024-41932

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UBUNTU-CVE-2024-41932

Summary:

Details: 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

References: https://ubuntu.com/security/CVE-2024-41932, https://www.cve.org/CVERecord?id=CVE-2024-41932, https://git.kernel.org/linus/70ee7947a29029736a1a06c73a48ff37674a851b, https://git.kernel.org/stable/c/5c3fb75f538cfcb886f6dfeb497d99fc2f263ee6, https://git.kernel.org/stable/c/70ee7947a29029736a1a06c73a48ff37674a851b, https://ubuntu.com/security/notices/USN-7379-1, https://ubuntu.com/security/notices/USN-7380-1, https://ubuntu.com/security/notices/USN-7381-1, https://ubuntu.com/security/notices/USN-7382-1, https://ubuntu.com/security/notices/USN-7379-2, https://ubuntu.com/security/notices/USN-7449-1, https://ubuntu.com/security/notices/USN-7450-1, https://ubuntu.com/security/notices/USN-7451-1, https://ubuntu.com/security/notices/USN-7452-1, https://ubuntu.com/security/notices/USN-7453-1, https://ubuntu.com/security/notices/USN-7449-2, https://ubuntu.com/security/notices/USN-7468-1, https://ubuntu.com/security/notices/USN-7523-1, https://ubuntu.com/security/notices/USN-7524-1