linux-cve-announce - CVE-2025-23162: drm/xe/vf: Don't try to trigger a full GT reset if VF

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Message-ID: <2025050132-CVE-2025-23162-fe44@gregkh>
Date: Thu,  1 May 2025 14:56:42 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2025-23162: drm/xe/vf: Don't try to trigger a full GT reset if VF

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

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

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

drm/xe/vf: Don't try to trigger a full GT reset if VF

VFs don't have access to the GDRST(0x941c) register that driver
uses to reset a GT. Attempt to trigger a reset using debugfs:

 $ cat /sys/kernel/debug/dri/0000:00:02.1/gt0/force_reset

or due to a hang condition detected by the driver leads to:

 [ ] xe 0000:00:02.1: [drm] GT0: trying reset from force_reset [xe]
 [ ] xe 0000:00:02.1: [drm] GT0: reset queued
 [ ] xe 0000:00:02.1: [drm] GT0: reset started
 [ ] ------------[ cut here ]------------
 [ ] xe 0000:00:02.1: [drm] GT0: VF is trying to write 0x1 to an inaccessible register 0x941c+0x0
 [ ] WARNING: CPU: 3 PID: 3069 at drivers/gpu/drm/xe/xe_gt_sriov_vf.c:996 xe_gt_sriov_vf_write32+0xc6/0x580 [xe]
 [ ] RIP: 0010:xe_gt_sriov_vf_write32+0xc6/0x580 [xe]
 [ ] Call Trace:
 [ ]  <TASK>
 [ ]  ? show_regs+0x6c/0x80
 [ ]  ? __warn+0x93/0x1c0
 [ ]  ? xe_gt_sriov_vf_write32+0xc6/0x580 [xe]
 [ ]  ? report_bug+0x182/0x1b0
 [ ]  ? handle_bug+0x6e/0xb0
 [ ]  ? exc_invalid_op+0x18/0x80
 [ ]  ? asm_exc_invalid_op+0x1b/0x20
 [ ]  ? xe_gt_sriov_vf_write32+0xc6/0x580 [xe]
 [ ]  ? xe_gt_sriov_vf_write32+0xc6/0x580 [xe]
 [ ]  ? xe_gt_tlb_invalidation_reset+0xef/0x110 [xe]
 [ ]  ? __mutex_unlock_slowpath+0x41/0x2e0
 [ ]  xe_mmio_write32+0x64/0x150 [xe]
 [ ]  do_gt_reset+0x2f/0xa0 [xe]
 [ ]  gt_reset_worker+0x14e/0x1e0 [xe]
 [ ]  process_one_work+0x21c/0x740
 [ ]  worker_thread+0x1db/0x3c0

Fix that by sending H2G VF_RESET(0x5507) action instead.

The Linux kernel CVE team has assigned CVE-2025-23162 to this issue.


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

	Fixed in 6.12.24 with commit 2eec2fa8666dcecebae33a565a818c9de9af8b50
	Fixed in 6.13.12 with commit 90b16edb3213e4ae4a3138bb20703ae367e88a01
	Fixed in 6.14.3 with commit a9bc61a61372897886f58fdaa5582e3f7bf9a50b
	Fixed in 6.15-rc1 with commit 459777724d306315070d24608fcd89aea85516d6

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-2025-23162
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_gt.c
	drivers/gpu/drm/xe/xe_gt_sriov_vf.c
	drivers/gpu/drm/xe/xe_gt_sriov_vf.h


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/2eec2fa8666dcecebae33a565a818c9de9af8b50
	https://git.kernel.org/stable/c/90b16edb3213e4ae4a3138bb20703ae367e88a01
	https://git.kernel.org/stable/c/a9bc61a61372897886f58fdaa5582e3f7bf9a50b
	https://git.kernel.org/stable/c/459777724d306315070d24608fcd89aea85516d6