linux-cve-announce - CVE-2024-50178: cpufreq: loongson3: Use raw_smp_processor_id() in do_service

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Message-ID: <2024110807-CVE-2024-50178-f72f@gregkh>
Date: Fri,  8 Nov 2024 06:24:09 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: CVE-2024-50178: cpufreq: loongson3: Use raw_smp_processor_id() in do_service_request()

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

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

cpufreq: loongson3: Use raw_smp_processor_id() in do_service_request()

Use raw_smp_processor_id() instead of plain smp_processor_id() in
do_service_request(), otherwise we may get some errors with the driver
enabled:

 BUG: using smp_processor_id() in preemptible [00000000] code: (udev-worker)/208
 caller is loongson3_cpufreq_probe+0x5c/0x250 [loongson3_cpufreq]

The Linux kernel CVE team has assigned CVE-2024-50178 to this issue.


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

	Fixed in 6.11.3 with commit 2f78e4a6d270
	Fixed in 6.12-rc1 with commit 2b7ec33e534f

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-2024-50178
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/cpufreq/loongson3_cpufreq.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/2f78e4a6d2702ac03c2bf2ed3a0e344e1fa9f967
	https://git.kernel.org/stable/c/2b7ec33e534f7a10033a5cf07794acf48b182bbe