Description
In the Linux kernel, the following vulnerability has been resolved: libceph: reject buckets with mismatched CRUSH ids crush_decode() stores bucket data by array slot, and the mapper later derives the per-bucket workspace index from the decoded bucket id. A malformed map can therefore make one bucket reuse another bucket's workspace by encoding an id different from -1 - slot. For uniform buckets, the second replica selection expands the source bucket's permutation into that aliased workspace buffer. If the source bucket is larger than the aliased bucket, the write runs past the smaller permutation array and can escape the kvmalloc'd CRUSH workspace. KASAN reports a slab OOB write of 4 bytes in bucket_perm_choose(). Reject buckets whose encoded id does not match their array slot. Valid CRUSH maps already use the canonical negative id corresponding to the bucket slot, so this restores the invariant expected by work->work[-1 - in->id] without changing valid map behavior.
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
Linux Linux
Default version status: unaffected
66a0e2d579dbec5c676cfe446234ffebb267c564 to < ee59040d6ed1a5f8d10d27174b8f32c90ca8e89aaffected66a0e2d579dbec5c676cfe446234ffebb267c564 to < baad5875fdd2f5e248250fc3519bb045d64f1716affected66a0e2d579dbec5c676cfe446234ffebb267c564 to < 4aeb93daadf388e72073abc204312dd364eeb30aaffected66a0e2d579dbec5c676cfe446234ffebb267c564 to < 6e5c6ce252b1eccfd41670a5cf95ab44f7ba7022affected66a0e2d579dbec5c676cfe446234ffebb267c564 to < 3516a4131c4e45d62ee4e42e82c36930e8c1fbbdaffected66a0e2d579dbec5c676cfe446234ffebb267c564 to < 00562ccd4e88d092b9b851df50fad20442bfeb24affected66a0e2d579dbec5c676cfe446234ffebb267c564 to < 79900d978158b2d80eef952fc41b9e4dc58d7b83affected66a0e2d579dbec5c676cfe446234ffebb267c564 to < 3cde4a8302301679937474a5f7a851394cc1bd11affected
Linux Linux
Default version status: affected
4.11affected0 to < 4.11unaffected5.10.270 to ≤ 5.10.*unaffected5.15.221 to ≤ 5.15.*unaffected6.1.188 to ≤ 6.1.*unaffected6.6.157 to ≤ 6.6.*unaffected6.12.109 to ≤ 6.12.*unaffected6.18.50 to ≤ 6.18.*unaffected7.2.4 to ≤ 7.2.*unaffected7.3 to ≤ *unaffected
References
- https://git.kernel.org/stable/c/ee59040d6ed1a5f8d10d27174b8f32c90ca8e89a ↗
- https://git.kernel.org/stable/c/baad5875fdd2f5e248250fc3519bb045d64f1716 ↗
- https://git.kernel.org/stable/c/4aeb93daadf388e72073abc204312dd364eeb30a ↗
- https://git.kernel.org/stable/c/6e5c6ce252b1eccfd41670a5cf95ab44f7ba7022 ↗
- https://git.kernel.org/stable/c/3516a4131c4e45d62ee4e42e82c36930e8c1fbbd ↗
- https://git.kernel.org/stable/c/00562ccd4e88d092b9b851df50fad20442bfeb24 ↗
- https://git.kernel.org/stable/c/79900d978158b2d80eef952fc41b9e4dc58d7b83 ↗
- https://git.kernel.org/stable/c/3cde4a8302301679937474a5f7a851394cc1bd11 ↗