Description
In the Linux kernel, the following vulnerability has been resolved: nfsd: fix stale s2s_cp_stateids IDR entry for async COPY For an async COPY, nfsd4_copy() called nfs4_init_copy_state() before dup_copy_fields(), so the s2s_cp_stateids IDR was pointed at &u->copy->cp_stateid -- memory in the per-rqstp COMPOUND buffer that is reused by the next request. dup_copy_fields() copies only the value into async_copy, so the IDR slot dangled at the transient buffer for the whole background copy. Any IDR walker then dereferences reused request memory: the laundromat reads cs_type from it and, if the bytes look like an expired NFS4_COPYNOTIFY_STID, follows into refcount_dec()/idr_remove()/kfree() on garbage; manage_cpntf_state() has the same exposure via idr_find(). Duplicate the fields first, then register the stateid on the stable async_copy. result->cb_stateid is unchanged.
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 < 745b2edfdd96b8738a94dee450adff4c7d026d5baffectede0639dc5805a9d4faaa2c07ad98fa853b9529dd3 to < bdce362f49410b9def65d76c21f6259cd89696d8affectede0639dc5805a9d4faaa2c07ad98fa853b9529dd3 to < 7aa34ea78f74e6ef60c8112635a87fc43d57f6c9affectede0639dc5805a9d4faaa2c07ad98fa853b9529dd3 to < 9b4e5e9ba5ae13808b8a6d229d87c54611ba0e7aaffectede0639dc5805a9d4faaa2c07ad98fa853b9529dd3 to < 14b978e8d05ce018d0afbeb6611833ef91713a02affectede0639dc5805a9d4faaa2c07ad98fa853b9529dd3 to < d0beaee498e11880e72826026db0e9c9890fc114affected
Linux Linux
Default version status: affected
4.20affected0 to < 4.20unaffected6.1.191 to ≤ 6.1.*unaffected6.6.160 to ≤ 6.6.*unaffected6.12.111 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/745b2edfdd96b8738a94dee450adff4c7d026d5b ↗
- https://git.kernel.org/stable/c/bdce362f49410b9def65d76c21f6259cd89696d8 ↗
- https://git.kernel.org/stable/c/7aa34ea78f74e6ef60c8112635a87fc43d57f6c9 ↗
- https://git.kernel.org/stable/c/9b4e5e9ba5ae13808b8a6d229d87c54611ba0e7a ↗
- https://git.kernel.org/stable/c/14b978e8d05ce018d0afbeb6611833ef91713a02 ↗
- https://git.kernel.org/stable/c/d0beaee498e11880e72826026db0e9c9890fc114 ↗