CVEvulnerability
CVE-2023-54268
- Status
- Deferred
- Published
- 2025-12-30
- Last modified
- 2026-06-17
- Assigner
- 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Description
In the Linux kernel, the following vulnerability has been resolved:
debugobjects: Don't wake up kswapd from fill_pool()
syzbot is reporting a lockdep warning in fill_pool() because the allocation
from debugobjects is using GFP_ATOMIC, which is (__GFP_HIGH | __GFP_KSWAPD_RECLAIM)
and therefore tries to wake up kswapd, which acquires kswapd_wait::lock.
Since fill_pool() might be called with arbitrary locks held, fill_pool()
should not assume that acquiring kswapd_wait::lock is safe.
Use __GFP_HIGH instead and remove __GFP_NORETRY as it is pointless for
!__GFP_DIRECT_RECLAIM allocation.
References
- https://git.kernel.org/stable/c/4c088d30a72d9b8f9c6ae9362222942e4075cb00 git.kernel.org
- https://git.kernel.org/stable/c/aee97eec77029270866c704f66cdf2881cbd2fe1 git.kernel.org
- https://git.kernel.org/stable/c/be646802b3dc408c4dc72a3ac32c3f4a0282414d git.kernel.org
- https://git.kernel.org/stable/c/d7fff52c99d52f180d8bef95d8ed8fec6343889c git.kernel.org
- https://git.kernel.org/stable/c/eb799279fb1f9c63c520fe8c1c41cb9154252db6 git.kernel.org
- https://git.kernel.org/stable/c/fd673079749bac97bb30f1461df079e6c8e86511 git.kernel.org