Description
In the Linux kernel, the following vulnerability has been resolved: drm/lima: mask irqs in timeout path before hard reset There is a race condition in which a rendering job might take just long enough to trigger the drm sched job timeout handler but also still complete before the hard reset is done by the timeout handler. This runs into race conditions not expected by the timeout handler. In some very specific cases it currently may result in a refcount imbalance on lima_pm_idle, with a stack dump such as: [10136.669170] WARNING: CPU: 0 PID: 0 at drivers/gpu/drm/lima/lima_devfreq.c:205 lima_devfreq_record_idle+0xa0/0xb0 ... [10136.669459] pc : lima_devfreq_record_idle+0xa0/0xb0 ... [10136.669628] Call trace: [10136.669634] lima_devfreq_record_idle+0xa0/0xb0 [10136.669646] lima_sched_pipe_task_done+0x5c/0xb0 [10136.669656] lima_gp_irq_handler+0xa8/0x120 [10136.669666] __handle_irq_event_percpu+0x48/0x160 [10136.669679] handle_irq_event+0x4c/0xc0 We can prevent that race condition entirely by masking the irqs at the beginning of the timeout handler, at which point we give up on waiting for that job entirely. The irqs will be enabled again at the next hard reset which is already done as a recovery by the timeout handler.
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
Linux Linux
Default version status: unaffected
a1d2a6339961efc078208dc3b2f006e9e9a8e119 to < 03e7b2f7ae4c0ae5fb8e4e2454ba4008877f196aaffecteda1d2a6339961efc078208dc3b2f006e9e9a8e119 to < 70aa1f2dec46b6fdb5f6b9f37b6bfa4a4dee0d3aaffecteda1d2a6339961efc078208dc3b2f006e9e9a8e119 to < 9fd8ddd23793a50dbcd11c6ba51f437f1ea7d344affecteda1d2a6339961efc078208dc3b2f006e9e9a8e119 to < bdbc4ca77f5eaac15de7230814253cddfed273b1affecteda1d2a6339961efc078208dc3b2f006e9e9a8e119 to < 58bfd311c93d66d8282bf21ebbf35cc3bb8ad9dbaffecteda1d2a6339961efc078208dc3b2f006e9e9a8e119 to < a421cc7a6a001b70415aa4f66024fa6178885a14affected
Linux Linux
Default version status: affected
5.2affected0 to < 5.2unaffected5.10.221 to ≤ 5.10.*unaffected5.15.162 to ≤ 5.15.*unaffected6.1.96 to ≤ 6.1.*unaffected6.6.36 to ≤ 6.6.*unaffected6.9.7 to ≤ 6.9.*unaffected6.10 to ≤ *unaffected
References
- https://git.kernel.org/stable/c/03e7b2f7ae4c0ae5fb8e4e2454ba4008877f196a ↗
- https://git.kernel.org/stable/c/70aa1f2dec46b6fdb5f6b9f37b6bfa4a4dee0d3a ↗
- https://git.kernel.org/stable/c/9fd8ddd23793a50dbcd11c6ba51f437f1ea7d344 ↗
- https://git.kernel.org/stable/c/bdbc4ca77f5eaac15de7230814253cddfed273b1 ↗
- https://git.kernel.org/stable/c/58bfd311c93d66d8282bf21ebbf35cc3bb8ad9db ↗
- https://git.kernel.org/stable/c/a421cc7a6a001b70415aa4f66024fa6178885a14 ↗
- https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html ↗