drm/lima: mask irqs in timeout path before hard reset
Published Jul 12, 2024
5.5
MEDIUMCVSS 3.1
EPSS 0.22%
Description
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 StatusaffectedConstraints
- Version StatusaffectedConstraints
- Version StatusaffectedConstraints
- Version StatusaffectedConstraints
- Version StatusaffectedConstraints
- Version StatusaffectedConstraints
- Version
-
- Version 5.2StatusaffectedConstraints-
- Version 0StatusunaffectedConstraints<5.2
- Version 5.10.221StatusunaffectedConstraints<=5.10.*
- Version 5.15.162StatusunaffectedConstraints<=5.15.*
- Version 6.1.96StatusunaffectedConstraints<=6.1.*
- Version 6.10StatusunaffectedConstraints<=*
- Version 6.6.36StatusunaffectedConstraints<=6.6.*
- Version 6.9.7StatusunaffectedConstraints<=6.9.*
- Version
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
| Vendor | Product | Default status | Versions | |||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Linux | Linux | unaffected |
| |||||||||||||||||||||||||||
| Linux | Linux | affected |
|
- ≥ 5.2 · < 5.10.221
- ≥ 5.11 · < 5.15.162
- ≥ 5.16 · < 6.1.96
- ≥ 6.2 · < 6.6.36
- ≥ 6.7 · < 6.9.7
No data.
Red Hat Enterprise Linux 6
kernel
Not affected
Red Hat Enterprise Linux 7
kernel
Not affected
Red Hat Enterprise Linux 7
kernel-rt
Not affected
Red Hat Enterprise Linux 8
kernel
Not affected
Red Hat Enterprise Linux 8
kernel-rt
Not affected
Red Hat Enterprise Linux 9
kernel
Not affected
Red Hat Enterprise Linux 9
kernel-rt
Not affected
| Product | Package | State | Advisory |
|---|---|---|---|
| Red Hat Enterprise Linux 6 | kernel | Not affected | n/a |
| Red Hat Enterprise Linux 7 | kernel | Not affected | n/a |
| Red Hat Enterprise Linux 7 | kernel-rt | Not affected | n/a |
| Red Hat Enterprise Linux 8 | kernel | Not affected | n/a |
| Red Hat Enterprise Linux 8 | kernel-rt | Not affected | n/a |
| Red Hat Enterprise Linux 9 | kernel | Not affected | n/a |
| Red Hat Enterprise Linux 9 | kernel-rt | Not affected | n/a |
No package ranges for this CVE.
Remediation
Red Hat statement
Red Hat Enterprise Linux is not vulnerable to this CVE, as it does not affect the versions or configurations of the Linux kernel used in its distributions.
Red Hat mitigation
Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.
References (12)
- https://access.redhat.com/security/cve/CVE-2024-40976 Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=2297560 Issue Tracking
- https://git.kernel.org/stable/c/03e7b2f7ae4c0ae5fb8e4e2454ba4008877f196a Patch
- https://git.kernel.org/stable/c/58bfd311c93d66d8282bf21ebbf35cc3bb8ad9db Patch
- https://git.kernel.org/stable/c/70aa1f2dec46b6fdb5f6b9f37b6bfa4a4dee0d3a Patch
- https://git.kernel.org/stable/c/9fd8ddd23793a50dbcd11c6ba51f437f1ea7d344 Patch
- https://git.kernel.org/stable/c/a421cc7a6a001b70415aa4f66024fa6178885a14 Patch
- https://git.kernel.org/stable/c/bdbc4ca77f5eaac15de7230814253cddfed273b1 Patch
- https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html
- https://lore.kernel.org/linux-cve-announce/2024071230-CVE-2024-40976-5e52@gregkh/T
- https://nvd.nist.gov/vuln/detail/CVE-2024-40976
- https://www.cve.org/CVERecord?id=CVE-2024-40976
Change history (0)
No recorded changes yet.