linux-cve-announce - CVE-2024-57923: btrfs: zlib: fix avail_in bytes for s390 zlib HW compression path

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Message-ID: <2025011943-CVE-2024-57923-3c99@gregkh>
Date: Sun, 19 Jan 2025 12:52:54 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: CVE-2024-57923: btrfs: zlib: fix avail_in bytes for s390 zlib HW compression path

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

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

btrfs: zlib: fix avail_in bytes for s390 zlib HW compression path

Since the input data length passed to zlib_compress_folios() can be
arbitrary, always setting strm.avail_in to a multiple of PAGE_SIZE may
cause read-in bytes to exceed the input range. Currently this triggers
an assert in btrfs_compress_folios() on the debug kernel (see below).
Fix strm.avail_in calculation for S390 hardware acceleration path.

  assertion failed: *total_in <= orig_len, in fs/btrfs/compression.c:1041
  ------------[ cut here ]------------
  kernel BUG at fs/btrfs/compression.c:1041!
  monitor event: 0040 ilc:2 [#1] PREEMPT SMP
  CPU: 16 UID: 0 PID: 325 Comm: kworker/u273:3 Not tainted 6.13.0-20241204.rc1.git6.fae3b21430ca.300.fc41.s390x+debug #1
  Hardware name: IBM 3931 A01 703 (z/VM 7.4.0)
  Workqueue: btrfs-delalloc btrfs_work_helper
  Krnl PSW : 0704d00180000000 0000021761df6538 (btrfs_compress_folios+0x198/0x1a0)
             R:0 T:1 IO:1 EX:1 Key:0 M:1 W:0 P:0 AS:3 CC:1 PM:0 RI:0 EA:3
  Krnl GPRS: 0000000080000000 0000000000000001 0000000000000047 0000000000000000
             0000000000000006 ffffff01757bb000 000001976232fcc0 000000000000130c
             000001976232fcd0 000001976232fcc8 00000118ff4a0e30 0000000000000001
             00000111821ab400 0000011100000000 0000021761df6534 000001976232fb58
  Krnl Code: 0000021761df6528: c020006f5ef4        larl    %r2,0000021762be2310
             0000021761df652e: c0e5ffbd09d5        brasl   %r14,00000217615978d8
            #0000021761df6534: af000000            mc      0,0
            >0000021761df6538: 0707                bcr     0,%r7
             0000021761df653a: 0707                bcr     0,%r7
             0000021761df653c: 0707                bcr     0,%r7
             0000021761df653e: 0707                bcr     0,%r7
             0000021761df6540: c004004bb7ec        brcl    0,000002176276d518
  Call Trace:
   [<0000021761df6538>] btrfs_compress_folios+0x198/0x1a0
  ([<0000021761df6534>] btrfs_compress_folios+0x194/0x1a0)
   [<0000021761d97788>] compress_file_range+0x3b8/0x6d0
   [<0000021761dcee7c>] btrfs_work_helper+0x10c/0x160
   [<0000021761645760>] process_one_work+0x2b0/0x5d0
   [<000002176164637e>] worker_thread+0x20e/0x3e0
   [<000002176165221a>] kthread+0x15a/0x170
   [<00000217615b859c>] __ret_from_fork+0x3c/0x60
   [<00000217626e72d2>] ret_from_fork+0xa/0x38
  INFO: lockdep is turned off.
  Last Breaking-Event-Address:
   [<0000021761597924>] _printk+0x4c/0x58
  Kernel panic - not syncing: Fatal exception: panic_on_oops

The Linux kernel CVE team has assigned CVE-2024-57923 to this issue.


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

	Issue introduced in 6.12 with commit fd1e75d0105d2289e24b6d63cee49e6f7952c8bf and fixed in 6.12.10 with commit 25adbb08aeadcff883ab801df99fd20fefbb6ca4
	Issue introduced in 6.12 with commit fd1e75d0105d2289e24b6d63cee49e6f7952c8bf and fixed in 6.13-rc7 with commit 0ee4736c003daded513de0ff112d4a1e9c85bbab

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-2024-57923
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/btrfs/zlib.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/25adbb08aeadcff883ab801df99fd20fefbb6ca4
	https://git.kernel.org/stable/c/0ee4736c003daded513de0ff112d4a1e9c85bbab