CVE-2022-49133

drm/amdkfd: svm range restore work deadlock when process exit

Description

In the Linux kernel, the following vulnerability has been resolved: drm/amdkfd: svm range restore work deadlock when process exit kfd_process_notifier_release flush svm_range_restore_work which calls svm_range_list_lock_and_flush_work to flush deferred_list work, but if deferred_list work mmput release the last user, it will call exit_mmap -> notifier_release, it is deadlock with below backtrace. Move flush svm_range_restore_work to kfd_process_wq_release to avoid deadlock. Then svm_range_restore_work take task->mm ref to avoid mm is gone while validating and mapping ranges to GPU. Workqueue: events svm_range_deferred_list_work [amdgpu] Call Trace: wait_for_completion+0x94/0x100 __flush_work+0x12a/0x1e0 __cancel_work_timer+0x10e/0x190 cancel_delayed_work_sync+0x13/0x20 kfd_process_notifier_release+0x98/0x2a0 [amdgpu] __mmu_notifier_release+0x74/0x1f0 exit_mmap+0x170/0x200 mmput+0x5d/0x130 svm_range_deferred_list_work+0x104/0x230 [amdgpu] process_one_work+0x220/0x3c0

N/A

CVSS

Severity:

EPSS 0.03%

Affected: Linux Linux

References

Link	Tags
https://git.kernel.org/stable/c/a6be83086e91891081e0589e4b4645bf4643e897
https://git.kernel.org/stable/c/858822905f4bf44100d63c5e22e263109976f7cb
https://git.kernel.org/stable/c/6225bb3a88d22594aacea2485dc28ca12d596721

Frequently Asked Questions

What is the severity of CVE-2022-49133?: CVE-2022-49133 has not yet been assigned a CVSS score.
How to fix CVE-2022-49133?: To fix CVE-2022-49133, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2022-49133 being actively exploited in the wild?: As for now, there are no information to confirm that CVE-2022-49133 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2022-49133?: CVE-2022-49133 affects Linux Linux, Linux Linux.

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