linux-cve-announce - CVE-2022-49843: drm/amdkfd: Migrate in CPU page fault use current mm

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Message-ID: <2025050141-CVE-2022-49843-f36d@gregkh>
Date: Thu,  1 May 2025 16:10:33 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2022-49843: drm/amdkfd: Migrate in CPU page fault use current mm

From: Greg Kroah-Hartman <gregkh@...nel.org>

Description
===========

In the Linux kernel, the following vulnerability has been resolved:

drm/amdkfd: Migrate in CPU page fault use current mm

migrate_vma_setup shows below warning because we don't hold another
process mm mmap_lock. We should use current vmf->vma->vm_mm instead, the
caller already hold current mmap lock inside CPU page fault handler.

 WARNING: CPU: 10 PID: 3054 at include/linux/mmap_lock.h:155 find_vma
 Call Trace:
  walk_page_range+0x76/0x150
  migrate_vma_setup+0x18a/0x640
  svm_migrate_vram_to_ram+0x245/0xa10 [amdgpu]
  svm_migrate_to_ram+0x36f/0x470 [amdgpu]
  do_swap_page+0xcfe/0xec0
  __handle_mm_fault+0x96b/0x15e0
  handle_mm_fault+0x13f/0x3e0
  do_user_addr_fault+0x1e7/0x690

The Linux kernel CVE team has assigned CVE-2022-49843 to this issue.


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

	Issue fixed in mainline with commit 3a87606

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-2022-49843
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_migrate.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/1dea25e25acd990d7657940ffcab8354c28fa292
	https://git.kernel.org/stable/c/128e284c6cccf5875261569fa3bb07558870c17f
	https://git.kernel.org/stable/c/3a876060892ba52dd67d197c78b955e62657d906