Description (CNA)
In the Linux kernel, the following vulnerability has been resolved: md/raid5: round bitmap stripes with sector division raid5_bitmap_sector_map() aligns the array range to full RAID5 stripe widths before converting it to component sectors. That width is chunk_sectors multiplied by the number of data disks, and it is not always a power of two. Reproduce with a 4-disk RAID5, 1024-sector chunks, and three data disks. The full-stripe width is 3072 sectors. For a one-sector write at array sector 3072, correct rounding gives array range [3072, 6144), which maps to component range [1024, 2048). The old round_down()/round_up() logic instead gives [1024, 4096), which maps to [0, 1024). Use sector_div() based arithmetic so the rounded range is aligned to the actual RAID5 stripe width. The deterministic mapper test now reports the fixed component range as [1024, 2048), while the old mask-based range was [0, 1024).
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected b29e6400be51c214a0ad30dce937348b57abe33a before 9d7490007707f90691911385365bd1d691d99225; affected aa8e15d69f5c0044d5bff61844e163aacc4ac172 before cab7d949b18b2f1cd625689dc16c5f81236bac93; affected 9c89f604476cf15c31fbbdb043cff7fbf1dbe0cb before 02c10581866d08822c6348e299881485fc546185; affected 9c89f604476cf15c31fbbdb043cff7fbf1dbe0cb before ccbdc483eb041eef809e9ff223d1ad63518a2c52; affected 9c89f604476cf15c31fbbdb043cff7fbf1dbe0cb before 17ea021ae74987d6064c8195c4922fa025753892; affected a41a0df5d7638acf15e723ad985980b4f7ff9383; affected 6.6.79 before 6.6.157; affected 6.12.13 before 6.12.110; affected 6.13.2 before 6.14 |
| Linux / Linux | affected 6.14; unaffected 0 before 6.14; unaffected 6.6.157 through 6.6.*; unaffected 6.12.110 through 6.12.*; unaffected 6.18.52 through 6.18.*; unaffected 7.2.6 through 7.2.*; unaffected 7.3 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/9d7490007707f90691911385365bd1d691d99225
- https://git.kernel.org/stable/c/cab7d949b18b2f1cd625689dc16c5f81236bac93
- https://git.kernel.org/stable/c/02c10581866d08822c6348e299881485fc546185
- https://git.kernel.org/stable/c/ccbdc483eb041eef809e9ff223d1ad63518a2c52
- https://git.kernel.org/stable/c/17ea021ae74987d6064c8195c4922fa025753892