linux-cve-announce - CVE-2024-50216: xfs: fix finding a last resort AG in xfs_filestream_pick

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [day] [month] [year] [list]

Message-ID: <2024110924-CVE-2024-50216-a031@gregkh>
Date: Sat,  9 Nov 2024 11:15:24 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: CVE-2024-50216: xfs: fix finding a last resort AG in xfs_filestream_pick_ag

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

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

xfs: fix finding a last resort AG in xfs_filestream_pick_ag

When the main loop in xfs_filestream_pick_ag fails to find a suitable
AG it tries to just pick the online AG.  But the loop for that uses
args->pag as loop iterator while the later code expects pag to be
set.  Fix this by reusing the max_pag case for this last resort, and
also add a check for impossible case of no AG just to make sure that
the uninitialized pag doesn't even escape in theory.

The Linux kernel CVE team has assigned CVE-2024-50216 to this issue.


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

	Issue introduced in 6.3 with commit f8f1ed1ab3ba and fixed in 6.6.60 with commit 77ddc732416b
	Issue introduced in 6.3 with commit f8f1ed1ab3ba and fixed in 6.11.7 with commit a023408925ac
	Issue introduced in 6.3 with commit f8f1ed1ab3ba and fixed in 6.12-rc6 with commit dc60992ce76f

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-2024-50216
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:
	fs/xfs/xfs_filestream.c
	fs/xfs/xfs_trace.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/77ddc732416b017180893cbb2356e9f0a414c575
	https://git.kernel.org/stable/c/a023408925acd64db5c8980373fcb3e28ec6fd29
	https://git.kernel.org/stable/c/dc60992ce76fbc2f71c2674f435ff6bde2108028