linux-cve-announce - CVE-2024-46859: platform/x86: panasonic-laptop: Fix SINF array out of bounds accesses

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Message-ID: <2024092744-CVE-2024-46859-e785@gregkh>
Date: Fri, 27 Sep 2024 14:43:52 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: CVE-2024-46859: platform/x86: panasonic-laptop: Fix SINF array out of bounds accesses

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

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

platform/x86: panasonic-laptop: Fix SINF array out of bounds accesses

The panasonic laptop code in various places uses the SINF array with index
values of 0 - SINF_CUR_BRIGHT(0x0d) without checking that the SINF array
is big enough.

Not all panasonic laptops have this many SINF array entries, for example
the Toughbook CF-18 model only has 10 SINF array entries. So it only
supports the AC+DC brightness entries and mute.

Check that the SINF array has a minimum size which covers all AC+DC
brightness entries and refuse to load if the SINF array is smaller.

For higher SINF indexes hide the sysfs attributes when the SINF array
does not contain an entry for that attribute, avoiding show()/store()
accessing the array out of bounds and add bounds checking to the probe()
and resume() code accessing these.

The Linux kernel CVE team has assigned CVE-2024-46859 to this issue.

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

	Issue introduced in 3.3 with commit e424fb8cc4e6 and fixed in 6.1.111 with commit 9291fadbd272
	Issue introduced in 3.3 with commit e424fb8cc4e6 and fixed in 6.6.52 with commit 6821a82616f6
	Issue introduced in 3.3 with commit e424fb8cc4e6 and fixed in 6.10.11 with commit b38c19783286
	Issue introduced in 3.3 with commit e424fb8cc4e6 and fixed in 6.11 with commit f52e98d16e9b

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-2024-46859
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/platform/x86/panasonic-laptop.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/9291fadbd2720a869b1d2fcf82305648e2e62a16
	https://git.kernel.org/stable/c/6821a82616f60aa72c5909b3e252ad97fb9f7e2a
	https://git.kernel.org/stable/c/b38c19783286a71693c2194ed1b36665168c09c4
	https://git.kernel.org/stable/c/f52e98d16e9bd7dd2b3aef8e38db5cbc9899d6a4