linux-cve-announce - CVE-2024-46866: drm/xe/client: add missing bo locking in show

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Message-ID: <2024092746-CVE-2024-46866-c414@gregkh>
Date: Fri, 27 Sep 2024 14:43:59 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: CVE-2024-46866: drm/xe/client: add missing bo locking in show_meminfo()

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

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

drm/xe/client: add missing bo locking in show_meminfo()

bo_meminfo() wants to inspect bo state like tt and the ttm resource,
however this state can change at any point leading to stuff like NPD and
UAF, if the bo lock is not held. Grab the bo lock when calling
bo_meminfo(), ensuring we drop any spinlocks first. In the case of
object_idr we now also need to hold a ref.

v2 (MattB)
  - Also add xe_bo_assert_held()

(cherry picked from commit 4f63d712fa104c3ebefcb289d1e733e86d8698c7)

The Linux kernel CVE team has assigned CVE-2024-46866 to this issue.


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

	Issue introduced in 6.8 with commit 0845233388f8 and fixed in 6.10.11 with commit abc8feacacf8
	Issue introduced in 6.8 with commit 0845233388f8 and fixed in 6.11 with commit 94c4aa266111

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-2024-46866
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/xe/xe_drm_client.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/abc8feacacf8fae10eecf6fea7865e8c1fee419c
	https://git.kernel.org/stable/c/94c4aa266111262c96c98f822d1bccc494786fee