Description
In the Linux kernel, the following vulnerability has been resolved: nvdimm/btt: reject an arena whose nfree is below the lane count The BTT info block's nfree field, the number of reserve free blocks, is read from the medium without validation. btt_freelist_init() and btt_rtt_init() size the per-lane freelist[] and rtt[] arrays by nfree, but the I/O path indexes them by the lane from nd_region_acquire_lane(), which is bounded by nd_region->num_lanes (ND_MAX_LANES), not by nfree. A crafted or foreign arena whose nfree is below the lane count makes freelist[lane]/rtt[lane] run past the allocation: an out-of-bounds write. btt.rst documents the nlanes = min(nfree, num_cpus) invariant, which the code does not currently honor: num_lanes is ND_MAX_LANES regardless of nfree. Reject an arena whose nfree is below num_lanes at discovery, before the per-lane arrays are allocated, enforcing that invariant.
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
5212e11fde4d40fa627668b4f2222d20db488f71 to < eb491343d2d1784121ad9af91c25b338c28913c3affected5212e11fde4d40fa627668b4f2222d20db488f71 to < 59d5cd1f42b4bab3609512c3cb3d3540d3d21da7affected5212e11fde4d40fa627668b4f2222d20db488f71 to < f6c5313aae794ecca8f762c1a3493de5c266f120affected5212e11fde4d40fa627668b4f2222d20db488f71 to < f9bf05c63b77d000e9c01f3e47af36973887d350affected5212e11fde4d40fa627668b4f2222d20db488f71 to < 6f79d1a5f2611a3d36e9312be5425cd9cb397c51affected5212e11fde4d40fa627668b4f2222d20db488f71 to < 6b1faf1f099f7060b5f1f2f0d024132581f1726eaffected5212e11fde4d40fa627668b4f2222d20db488f71 to < 9dfa11cef4750b67591307f2c62e47a23d60e4b7affected5212e11fde4d40fa627668b4f2222d20db488f71 to < 6a1f2e5ed9267ca19187038ac635393c165213acaffected
Linux Linux
Default version status: affected
4.2affected0 to < 4.2unaffected5.10.270 to ≤ 5.10.*unaffected5.15.221 to ≤ 5.15.*unaffected6.1.188 to ≤ 6.1.*unaffected6.6.157 to ≤ 6.6.*unaffected6.12.110 to ≤ 6.12.*unaffected6.18.51 to ≤ 6.18.*unaffected7.2.5 to ≤ 7.2.*unaffected7.3 to ≤ *unaffected
References
- https://git.kernel.org/stable/c/eb491343d2d1784121ad9af91c25b338c28913c3 ↗
- https://git.kernel.org/stable/c/59d5cd1f42b4bab3609512c3cb3d3540d3d21da7 ↗
- https://git.kernel.org/stable/c/f6c5313aae794ecca8f762c1a3493de5c266f120 ↗
- https://git.kernel.org/stable/c/f9bf05c63b77d000e9c01f3e47af36973887d350 ↗
- https://git.kernel.org/stable/c/6f79d1a5f2611a3d36e9312be5425cd9cb397c51 ↗
- https://git.kernel.org/stable/c/6b1faf1f099f7060b5f1f2f0d024132581f1726e ↗
- https://git.kernel.org/stable/c/9dfa11cef4750b67591307f2c62e47a23d60e4b7 ↗
- https://git.kernel.org/stable/c/6a1f2e5ed9267ca19187038ac635393c165213ac ↗