linux-cve-announce - CVE-2022-49133: drm/amdkfd: svm range restore work deadlock when process exit

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Message-ID: <2025022606-CVE-2022-49133-d5c9@gregkh>
Date: Wed, 26 Feb 2025 02:55:38 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: 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

The Linux kernel CVE team has assigned CVE-2022-49133 to this issue.


Affected and fixed versions
===========================

	Fixed in 5.16.20 with commit a6be83086e91891081e0589e4b4645bf4643e897
	Fixed in 5.17.3 with commit 858822905f4bf44100d63c5e22e263109976f7cb
	Fixed in 5.18 with commit 6225bb3a88d22594aacea2485dc28ca12d596721

Please see https://www.kernel.org for a full list of currently supported
kernel versions by the kernel community.

Unaffected versions might change over time as fixes are backported to
older supported kernel versions.  The official CVE entry at
	https://cve.org/CVERecord/?id=CVE-2022-49133
will be updated if fixes are backported, please check that for the most
up to date information about this issue.


Affected files
==============

The file(s) affected by this issue are:
	drivers/gpu/drm/amd/amdkfd/kfd_process.c
	drivers/gpu/drm/amd/amdkfd/kfd_svm.c


Mitigation
==========

The Linux kernel CVE team recommends that you update to the latest
stable kernel version for this, and many other bugfixes.  Individual
changes are never tested alone, but rather are part of a larger kernel
release.  Cherry-picking individual commits is not recommended or
supported by the Linux kernel community at all.  If however, updating to
the latest release is impossible, the individual changes to resolve this
issue can be found at these commits:
	https://git.kernel.org/stable/c/a6be83086e91891081e0589e4b4645bf4643e897
	https://git.kernel.org/stable/c/858822905f4bf44100d63c5e22e263109976f7cb
	https://git.kernel.org/stable/c/6225bb3a88d22594aacea2485dc28ca12d596721