CVE-2023-54180

published 2025-12-30

CVE-2023-54180: In the Linux kernel, the following vulnerability has been resolved: btrfs: handle case when repair happens with dev-replace [BUG] There is a bug report that a…

Priority P4 22

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

btrfs: handle case when repair happens with dev-replace

[BUG]
There is a bug report that a BUG_ON() in btrfs_repair_io_failure()
(originally repair_io_failure() in v6.0 kernel) got triggered when
replacing a unreliable disk:

BTRFS warning (device sda1): csum failed root 257 ino 2397453 off 39624704 csum 0xb0d18c75 expected csum 0x4dae9c5e mirror 3
kernel BUG at fs/btrfs/extent_io.c:2380!
invalid opcode: 0000 [#1] PREEMPT SMP NOPTI
CPU: 9 PID: 3614331 Comm: kworker/u257:2 Tainted: G OE 6.0.0-5-amd64 #1 Debian 6.0.10-2
Hardware name: Micro-Star International Co., Ltd. MS-7C60/TRX40 PRO WIFI (MS-7C60), BIOS 2.70 07/01/2021
Workqueue: btrfs-endio btrfs_end_bio_work [btrfs]
RIP: 0010:repair_io_failure+0x24a/0x260 [btrfs]
Call Trace:

clean_io_failure+0x14d/0x180 [btrfs]
end_bio_extent_readpage+0x412/0x6e0 [btrfs]
? __switch_to+0x106/0x420
process_one_work+0x1c7/0x380
worker_thread+0x4d/0x380
? rescuer_thread+0x3a0/0x3a0
kthread+0xe9/0x110
? kthread_complete_and_exit+0x20/0x20
ret_from_fork+0x22/0x30

[CAUSE]

Before the BUG_ON(), we got some read errors from the replace target
first, note the mirror number (3, which is beyond RAID1 duplication,
thus it's read from the replace target device).

Then at the BUG_ON() location, we are trying to writeback the repaired
sectors back the failed device.

The check looks like this:

ret = btrfs_map_block(fs_info, BTRFS_MAP_WRITE, logical,
&map_length, &bioc, mirror_num);
if (ret)
goto out_counter_dec;
BUG_ON(mirror_num != bioc->mirror_num);

But inside btrfs_map_block(), we can modify bioc->mirror_num especially
for dev-replace:

if (dev_replace_is_ongoing && mirror_num == map->num_stripes + 1 &&
!need_full_stripe(op) && dev_replace->tgtdev != NULL) {
ret = get_extra_mirror_from_replace(fs_info, logical, *length,
dev_replace->srcdev->devid,
&mirror_num,
&physical_to_patch_in_first_stripe);
patch_the_first_stripe_for_dev_replace = 1;
}

Thus if we're repairing th

Affected

10 ranges

Vendor	Product	Version range	Fixed in
debian	linux	< linux 6.1.7-1 (bookworm)	linux 6.1.7-1 (bookworm)
linux	linux	—	—
linux	linux	>= ad6d620e2a5704f6bf3a39c92a75aad962c51cb3 < a7018b40b49c37fb55736499f790ec0d2b381ae4	a7018b40b49c37fb55736499f790ec0d2b381ae4
linux	linux	>= ad6d620e2a5704f6bf3a39c92a75aad962c51cb3 < 53e9d6851b56626885476a2966194ba994f8bb4b	53e9d6851b56626885476a2966194ba994f8bb4b
linux	linux	>= ad6d620e2a5704f6bf3a39c92a75aad962c51cb3 < d73a27b86fc722c28a26ec64002e3a7dc86d1c07	d73a27b86fc722c28a26ec64002e3a7dc86d1c07
linux	linux_kernel	>= 0 < 6.1.7-1	6.1.7-1
linux	linux_kernel	>= 0 < 6.1.7-1	6.1.7-1
linux	linux_kernel	>= 0 < 6.1.7-1	6.1.7-1
linux	linux_kernel	>= 3.8.0 < 6.0.19	6.0.19
linux	linux_kernel	>= 6.1.0 < 6.1.5	6.1.5

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