Description
In the Linux kernel, the following vulnerability has been resolved: partitions: aix: bound the pp_count scan to the ppe array aix_partition() reads the physical volume descriptor into a fixed-size struct pvd and then scans its physical-partition-extent array: int numpps = be16_to_cpu(pvd->pp_count); ... for (i = 0; i < numpps; i += 1) { struct ppe *p = pvd->ppe + i; ... lp_ix = be16_to_cpu(p->lp_ix); pvd points at a single kmalloc()'d struct pvd whose ppe[] member holds a fixed ARRAY_SIZE(pvd->ppe) (1016) entries, but the loop runs up to the on-disk pp_count. pp_count is an unvalidated __be16 read straight from the descriptor, so a crafted AIX image with pp_count larger than 1016 drives the loop to read pvd->ppe[i] past the end of the allocation (up to 65535 entries, ~2 MB out of bounds). The partition scan runs without mounting anything, when a block device with a crafted AIX/IBM partition table appears (an attacker-supplied image attached with losetup -P, or a device auto-scanned by udev), via msdos_partition() -> aix_partition(). Clamp the scan to the number of entries the ppe[] array can hold.
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
6ceea22bbbc84fcf6bf0913bb3db8a657e9002f6 to < 09861651617ba0fec089e8b9477439e68398c110affected6ceea22bbbc84fcf6bf0913bb3db8a657e9002f6 to < 5eacdb1967378f5e5591cd27a2d8cdee2df1a599affected6ceea22bbbc84fcf6bf0913bb3db8a657e9002f6 to < b5e9c09309e18fd9839ad007c238120353ca0cc4affected6ceea22bbbc84fcf6bf0913bb3db8a657e9002f6 to < fd94a779020f2ecc8b2607f4c20b34acb1763b9aaffected6ceea22bbbc84fcf6bf0913bb3db8a657e9002f6 to < 4671bb74bba05fdd4acf670a35758c29e8c97b83affected6ceea22bbbc84fcf6bf0913bb3db8a657e9002f6 to < ce93228e2193a17d2c58b656e439bb39fe5c3af8affected6ceea22bbbc84fcf6bf0913bb3db8a657e9002f6 to < 44f37ee92fdcd377c41bdf6a31cdd8cc7d4c410eaffected6ceea22bbbc84fcf6bf0913bb3db8a657e9002f6 to < 2dc0bfd2fe355fb930de63c2f2eb8ced8570c579affected
Linux Linux
Default version status: affected
3.11affected0 to < 3.11unaffected5.10.261 to ≤ 5.10.*unaffected5.15.212 to ≤ 5.15.*unaffected6.1.178 to ≤ 6.1.*unaffected6.6.145 to ≤ 6.6.*unaffected6.12.96 to ≤ 6.12.*unaffected6.18.39 to ≤ 6.18.*unaffected7.1.4 to ≤ 7.1.*unaffected7.2 to ≤ *unaffected
References
- https://git.kernel.org/stable/c/09861651617ba0fec089e8b9477439e68398c110 ↗
- https://git.kernel.org/stable/c/5eacdb1967378f5e5591cd27a2d8cdee2df1a599 ↗
- https://git.kernel.org/stable/c/b5e9c09309e18fd9839ad007c238120353ca0cc4 ↗
- https://git.kernel.org/stable/c/fd94a779020f2ecc8b2607f4c20b34acb1763b9a ↗
- https://git.kernel.org/stable/c/4671bb74bba05fdd4acf670a35758c29e8c97b83 ↗
- https://git.kernel.org/stable/c/ce93228e2193a17d2c58b656e439bb39fe5c3af8 ↗
- https://git.kernel.org/stable/c/44f37ee92fdcd377c41bdf6a31cdd8cc7d4c410e ↗
- https://git.kernel.org/stable/c/2dc0bfd2fe355fb930de63c2f2eb8ced8570c579 ↗