Description
In the Linux kernel, the following vulnerability has been resolved: NFSD: Limit the number of concurrent async COPY operations Nothing appears to limit the number of concurrent async COPY operations that clients can start. In addition, AFAICT each async COPY can copy an unlimited number of 4MB chunks, so can run for a long time. Thus IMO async COPY can become a DoS vector. Add a restriction mechanism that bounds the number of concurrent background COPY operations. Start simple and try to be fair -- this patch implements a per-namespace limit. An async COPY request that occurs while this limit is exceeded gets NFS4ERR_DELAY. The requesting client can choose to send the request again after a delay or fall back to a traditional read/write style copy. If there is need to make the mechanism more sophisticated, we can visit that in future patches.
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
e0639dc5805a9d4faaa2c07ad98fa853b9529dd3 to < 9e52ff544e0bfa09ee339fd7b0937ee3c080c24eaffectede0639dc5805a9d4faaa2c07ad98fa853b9529dd3 to < 43e46ee5efc03990b223f7aa8b77aa9c3d3acfdfaffectede0639dc5805a9d4faaa2c07ad98fa853b9529dd3 to < 7ea9260874b779637aff6d24c344b8ef4ac862a0affectede0639dc5805a9d4faaa2c07ad98fa853b9529dd3 to < ae267989b7b7933dfedcd26468d0a88fc3a9da9eaffectede0639dc5805a9d4faaa2c07ad98fa853b9529dd3 to < b4e21431a0db4854b5023cd5af001be557e6c3dbaffectede0639dc5805a9d4faaa2c07ad98fa853b9529dd3 to < 6a488ad7745b8f64625c6d3a24ce7e448e83f11baffectede0639dc5805a9d4faaa2c07ad98fa853b9529dd3 to < aadc3bbea163b6caaaebfdd2b6c4667fbc726752affected
Linux Linux
Default version status: affected
4.20affected0 to < 4.20unaffected5.10.231 to ≤ 5.10.*unaffected5.15.174 to ≤ 5.15.*unaffected6.1.119 to ≤ 6.1.*unaffected6.6.63 to ≤ 6.6.*unaffected6.10.14 to ≤ 6.10.*unaffected6.11.3 to ≤ 6.11.*unaffected6.12 to ≤ *unaffected
References
- https://git.kernel.org/stable/c/9e52ff544e0bfa09ee339fd7b0937ee3c080c24e ↗
- https://git.kernel.org/stable/c/43e46ee5efc03990b223f7aa8b77aa9c3d3acfdf ↗
- https://git.kernel.org/stable/c/7ea9260874b779637aff6d24c344b8ef4ac862a0 ↗
- https://git.kernel.org/stable/c/ae267989b7b7933dfedcd26468d0a88fc3a9da9e ↗
- https://git.kernel.org/stable/c/b4e21431a0db4854b5023cd5af001be557e6c3db ↗
- https://git.kernel.org/stable/c/6a488ad7745b8f64625c6d3a24ce7e448e83f11b ↗
- https://git.kernel.org/stable/c/aadc3bbea163b6caaaebfdd2b6c4667fbc726752 ↗
- https://lists.debian.org/debian-lts-announce/2025/03/msg00002.html ↗
- https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html ↗