linux-cve-announce - CVE-2024-57809: PCI: imx6: Fix suspend/resume support on i.MX6QDL

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Message-ID: <2025011103-CVE-2024-57809-a6be@gregkh>
Date: Sat, 11 Jan 2025 15:09:04 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: CVE-2024-57809: PCI: imx6: Fix suspend/resume support on i.MX6QDL

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

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

PCI: imx6: Fix suspend/resume support on i.MX6QDL

The suspend/resume functionality is currently broken on the i.MX6QDL
platform, as documented in the NXP errata (ERR005723):

  https://www.nxp.com/docs/en/errata/IMX6DQCE.pdf

This patch addresses the issue by sharing most of the suspend/resume
sequences used by other i.MX devices, while avoiding modifications to
critical registers that disrupt the PCIe functionality. It targets the
same problem as the following downstream commit:

  https://github.com/nxp-imx/linux-imx/commit/4e92355e1f79d225ea842511fcfd42b343b32995

Unlike the downstream commit, this patch also resets the connected PCIe
device if possible. Without this reset, certain drivers, such as ath10k
or iwlwifi, will crash on resume. The device reset is also done by the
driver on other i.MX platforms, making this patch consistent with
existing practices.

Upon resuming, the kernel will hang and display an error. Here's an
example of the error encountered with the ath10k driver:

  ath10k_pci 0000:01:00.0: Unable to change power state from D3hot to D0, device inaccessible
  Unhandled fault: imprecise external abort (0x1406) at 0x0106f944

Without this patch, suspend/resume will fail on i.MX6QDL devices if a
PCIe device is connected.

[kwilczynski: commit log, added tag for stable releases]

The Linux kernel CVE team has assigned CVE-2024-57809 to this issue.

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

	Fixed in 6.12.4 with commit ac43ea3d27a8f9beadf3af66c9ea4a566ebfff1f
	Fixed in 6.13-rc1 with commit 0a726f542d7c8cc0f9c5ed7df5a4bd4b59ac21b3

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-2024-57809
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/pci/controller/dwc/pci-imx6.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/ac43ea3d27a8f9beadf3af66c9ea4a566ebfff1f
	https://git.kernel.org/stable/c/0a726f542d7c8cc0f9c5ed7df5a4bd4b59ac21b3