Description
In the Linux kernel, the following vulnerability has been resolved: mm/damon/core: disallow non-power of two min_region_sz on damon_start() Commit d8f867fa0825 ("mm/damon: add damon_ctx->min_sz_region") introduced a bug that allows unaligned DAMON region address ranges. Commit c80f46ac228b ("mm/damon/core: disallow non-power of two min_region_sz") fixed it, but only for damon_commit_ctx() use case. Still, DAMON sysfs interface can emit non-power of two min_region_sz via damon_start(). Fix the path by adding the is_power_of_2() check on damon_start(). The issue was discovered by sashiko [1].
Affected products
- Linux / Linuxd8f867fa0825fb3e358457566d7326d8aab2406a – 1de2db19a6028abe7d905875922faef5b873de67
- Linux / Linuxd8f867fa0825fb3e358457566d7326d8aab2406a – 89b6226b6c2a4add3939f361653a47c212d6ab75
- Linux / Linuxd8f867fa0825fb3e358457566d7326d8aab2406a – 95093e5cb4c5b50a5b1a4b79f2942b62744bd66a
- Linux / Linux6.18 – 6.18
- Linux / Linux0 – 6.18
- Linux / Linux6.18.30 – 6.18.*
- Linux / Linux7.0.4 – 7.0.*
- Linux / Linux7.1 – *