Description (CNA)
In the Linux kernel, the following vulnerability has been resolved: jfs: jfs_dmap: Validate db_l2nbperpage while mounting In jfs_dmap.c at line 381, BLKTODMAP is used to get a logical block number inside dbFree(). db_l2nbperpage, which is the log2 number of blocks per page, is passed as an argument to BLKTODMAP which uses it for shifting. Syzbot reported a shift out-of-bounds crash because db_l2nbperpage is too big. This happens because the large value is set without any validation in dbMount() at line 181. Thus, make sure that db_l2nbperpage is correct while mounting. Max number of blocks per page = Page size / Min block size => log2(Max num_block per page) = log2(Page size / Min block size) = log2(Page size) - log2(Min block size) => Max db_l2nbperpage = L2PSIZE - L2MINBLOCKSIZE
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before 8c1efe3f74a7864461b0dff281c5562154b4aa8e; affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before ef5c205b6e6f8d1f18ef0b4a9832b1b5fa85f7f2; affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before a4855aeb13e4ad1f23e16753b68212e180f7d848; affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before 47b7eaae08e8b2f25bdf37bc14d21be090bcb20f; affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before de984faecddb900fa850af4df574a25b32bb93f5; affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before c7feb54b113802d2aba98708769d3c33fb017254; affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before 2a03c4e683d33d17b667418eb717b13dda1fac6b; affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before 11509910c599cbd04585ec35a6d5e1a0053d84c1 |
| Linux / Linux | affected 2.6.12; unaffected 0 before 2.6.12; unaffected 4.14.322 through 4.14.*; unaffected 4.19.291 through 4.19.*; unaffected 5.4.251 through 5.4.*; unaffected 5.10.188 through 5.10.*; unaffected 5.15.121 through 5.15.*; unaffected 6.1.40 through 6.1.*; unaffected 6.4.5 through 6.4.*; unaffected 6.5 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/8c1efe3f74a7864461b0dff281c5562154b4aa8e
- https://git.kernel.org/stable/c/ef5c205b6e6f8d1f18ef0b4a9832b1b5fa85f7f2
- https://git.kernel.org/stable/c/a4855aeb13e4ad1f23e16753b68212e180f7d848
- https://git.kernel.org/stable/c/47b7eaae08e8b2f25bdf37bc14d21be090bcb20f
- https://git.kernel.org/stable/c/de984faecddb900fa850af4df574a25b32bb93f5
- https://git.kernel.org/stable/c/c7feb54b113802d2aba98708769d3c33fb017254
- https://git.kernel.org/stable/c/2a03c4e683d33d17b667418eb717b13dda1fac6b
- https://git.kernel.org/stable/c/11509910c599cbd04585ec35a6d5e1a0053d84c1
ADP enrichment
No English description supplied.
No references supplied.