Bug 2312087 (CVE-2024-46699)

Summary: CVE-2024-46699 kernel: drm/v3d: Disable preemption while updating GPU stats
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
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Priority: high    
Version: unspecifiedCC: dfreiber, drow, jburrell, vkumar
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Hardware: All   
OS: Linux   
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Bug Depends On: 2312142    
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Description OSIDB Bzimport 2024-09-13 06:30:39 UTC 
In the Linux kernel, the following vulnerability has been resolved:

drm/v3d: Disable preemption while updating GPU stats

We forgot to disable preemption around the write_seqcount_begin/end() pair
while updating GPU stats:

  [ ] WARNING: CPU: 2 PID: 12 at include/linux/seqlock.h:221 __seqprop_assert.isra.0+0x128/0x150 [v3d]
  [ ] Workqueue: v3d_bin drm_sched_run_job_work [gpu_sched]
 <...snip...>
  [ ] Call trace:
  [ ]  __seqprop_assert.isra.0+0x128/0x150 [v3d]
  [ ]  v3d_job_start_stats.isra.0+0x90/0x218 [v3d]
  [ ]  v3d_bin_job_run+0x23c/0x388 [v3d]
  [ ]  drm_sched_run_job_work+0x520/0x6d0 [gpu_sched]
  [ ]  process_one_work+0x62c/0xb48
  [ ]  worker_thread+0x468/0x5b0
  [ ]  kthread+0x1c4/0x1e0
  [ ]  ret_from_fork+0x10/0x20

Fix it.
Comment 1 Michal Findra 2024-09-13 10:03:13 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2024091341-CVE-2024-46699-b1cf@gregkh/T