ghsa-r78q-c787-rf79
Vulnerability from github
Published
2025-01-11 15:30
Modified
2025-01-11 15:30
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
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{
  "affected": [],
  "aliases": [
    "CVE-2024-41932"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-01-11T13:15:20Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nsched: fix warning in sched_setaffinity\n\nCommit 8f9ea86fdf99b added some logic to sched_setaffinity that included\na WARN when a per-task affinity assignment races with a cpuset update.\n\nSpecifically, we can have a race where a cpuset update results in the\ntask affinity no longer being a subset of the cpuset. That\u0027s fine; we\nhave a fallback to instead use the cpuset mask. However, we have a WARN\nset up that will trigger if the cpuset mask has no overlap at all with\nthe requested task affinity. This shouldn\u0027t be a warning condition; its\ntrivial to create this condition.\n\nReproduced the warning by the following setup:\n\n- $PID inside a cpuset cgroup\n- another thread repeatedly switching the cpuset cpus from 1-2 to just 1\n- another thread repeatedly setting the $PID affinity (via taskset) to 2",
  "id": "GHSA-r78q-c787-rf79",
  "modified": "2025-01-11T15:30:27Z",
  "published": "2025-01-11T15:30:27Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2024-41932"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/5c3fb75f538cfcb886f6dfeb497d99fc2f263ee6"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/70ee7947a29029736a1a06c73a48ff37674a851b"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}


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