Description (CNA)
In the Linux kernel, the following vulnerability has been resolved: fs/jfs: Prevent integer overflow in AG size calculation The JFS filesystem calculates allocation group (AG) size using 1 << l2agsize in dbExtendFS(). When l2agsize exceeds 31 (possible with >2TB aggregates on 32-bit systems), this 32-bit shift operation causes undefined behavior and improper AG sizing. On 32-bit architectures: - Left-shifting 1 by 32+ bits results in 0 due to integer overflow - This creates invalid AG sizes (0 or garbage values) in sbi->bmap->db_agsize - Subsequent block allocations would reference invalid AG structures - Could lead to: - Filesystem corruption during extend operations - Kernel crashes due to invalid memory accesses - Security vulnerabilities via malformed on-disk structures Fix by casting to s64 before shifting: bmp->db_agsize = (s64)1 << l2agsize; This ensures 64-bit arithmetic even on 32-bit architectures. The cast matches the data type of db_agsize (s64) and follows similar patterns in JFS block calculation code. Found by Linux Verification Center (linuxtesting.org) with SVACE.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before dd07a985e2ded47b6c7d69fc93c1fe02977c8454; affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before 8bb29629a5e4090e1ef7199cb42db04a52802239; affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before 3d8a45f87010a802aa214bf39702ca9d99cbf3ba; affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before 55edbf5dbf60a8195c21e92124c4028939ae16b2; affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before 7ccf3b35274512b60ecb614e0637e76bd6f2d829; affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before c802a6a4009f585111f903e810b3be9c6d0da329; affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before 211ed8f5e39e61f9e4d18edd64ce8005a67a1b2a; affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before ec34cdf4f917cc6abd306cf091f8b8361fedac88; affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before 7fcbf789629cdb9fbf4e2172ce31136cfed11e5e |
| Linux / Linux | affected 2.6.12; unaffected 0 before 2.6.12; unaffected 5.4.293 through 5.4.*; unaffected 5.10.237 through 5.10.*; unaffected 5.15.181 through 5.15.*; unaffected 6.1.135 through 6.1.*; unaffected 6.6.88 through 6.6.*; unaffected 6.12.24 through 6.12.*; unaffected 6.13.12 through 6.13.*; unaffected 6.14.3 through 6.14.*; unaffected 6.15 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/dd07a985e2ded47b6c7d69fc93c1fe02977c8454
- https://git.kernel.org/stable/c/8bb29629a5e4090e1ef7199cb42db04a52802239
- https://git.kernel.org/stable/c/3d8a45f87010a802aa214bf39702ca9d99cbf3ba
- https://git.kernel.org/stable/c/55edbf5dbf60a8195c21e92124c4028939ae16b2
- https://git.kernel.org/stable/c/7ccf3b35274512b60ecb614e0637e76bd6f2d829
- https://git.kernel.org/stable/c/c802a6a4009f585111f903e810b3be9c6d0da329
- https://git.kernel.org/stable/c/211ed8f5e39e61f9e4d18edd64ce8005a67a1b2a
- https://git.kernel.org/stable/c/ec34cdf4f917cc6abd306cf091f8b8361fedac88
- https://git.kernel.org/stable/c/7fcbf789629cdb9fbf4e2172ce31136cfed11e5e
ADP enrichment
No English description supplied.