Description (CNA)
In the Linux kernel, the following vulnerability has been resolved: Squashfs: check return result of sb_min_blocksize Syzkaller reports an "UBSAN: shift-out-of-bounds in squashfs_bio_read" bug. Syzkaller forks multiple processes which after mounting the Squashfs filesystem, issues an ioctl("/dev/loop0", LOOP_SET_BLOCK_SIZE, 0x8000). Now if this ioctl occurs at the same time another process is in the process of mounting a Squashfs filesystem on /dev/loop0, the failure occurs. When this happens the following code in squashfs_fill_super() fails. ---- msblk->devblksize = sb_min_blocksize(sb, SQUASHFS_DEVBLK_SIZE); msblk->devblksize_log2 = ffz(~msblk->devblksize); ---- sb_min_blocksize() returns 0, which means msblk->devblksize is set to 0. As a result, ffz(~msblk->devblksize) returns 64, and msblk->devblksize_log2 is set to 64. This subsequently causes the UBSAN: shift-out-of-bounds in fs/squashfs/block.c:195:36 shift exponent 64 is too large for 64-bit type 'u64' (aka 'unsigned long long') This commit adds a check for a 0 return by sb_min_blocksize().
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 0aa666190509ffab81c202c5095a166be23961ac before db7096ea160e40d78c67fce52e7cc51bde049497; affected 0aa666190509ffab81c202c5095a166be23961ac before 549f9e3d7b60d53808c98b9fde49b4f46d0524a5; affected 0aa666190509ffab81c202c5095a166be23961ac before 5c51aa862cbeed2f3887f0382a2708956710bd68; affected 0aa666190509ffab81c202c5095a166be23961ac before 6abf6b78c6fb112eee495f5636ffcc350dd2ce25; affected 0aa666190509ffab81c202c5095a166be23961ac before 4f99357dadbf9c979ad737156ad4c37fadf7c56b; affected 0aa666190509ffab81c202c5095a166be23961ac before 0aff95d9bc7fb5400ca8af507429c4b067bdb425; affected 0aa666190509ffab81c202c5095a166be23961ac before 295ab18c2dbce8d0ac6ecf7c5187e16e1ac8b282; affected 0aa666190509ffab81c202c5095a166be23961ac before 734aa85390ea693bb7eaf2240623d41b03705c84 |
| Linux / Linux | affected 2.6.29; unaffected 0 before 2.6.29; unaffected 5.4.295 through 5.4.*; unaffected 5.10.239 through 5.10.*; unaffected 5.15.186 through 5.15.*; unaffected 6.1.142 through 6.1.*; unaffected 6.6.94 through 6.6.*; unaffected 6.12.34 through 6.12.*; unaffected 6.15.3 through 6.15.*; unaffected 6.16 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/db7096ea160e40d78c67fce52e7cc51bde049497
- https://git.kernel.org/stable/c/549f9e3d7b60d53808c98b9fde49b4f46d0524a5
- https://git.kernel.org/stable/c/5c51aa862cbeed2f3887f0382a2708956710bd68
- https://git.kernel.org/stable/c/6abf6b78c6fb112eee495f5636ffcc350dd2ce25
- https://git.kernel.org/stable/c/4f99357dadbf9c979ad737156ad4c37fadf7c56b
- https://git.kernel.org/stable/c/0aff95d9bc7fb5400ca8af507429c4b067bdb425
- https://git.kernel.org/stable/c/295ab18c2dbce8d0ac6ecf7c5187e16e1ac8b282
- https://git.kernel.org/stable/c/734aa85390ea693bb7eaf2240623d41b03705c84
ADP enrichment
No English description supplied.
No English description supplied.
No references supplied.