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

dm cache: fix dirty mapping checking in passthrough mode switching

As mentioned in commit 9b1cc9f251af ("dm cache: share cache-metadata
object across inactive and active DM tables"), dm-cache assumed table
reload occurs after suspension, while LVM's table preload breaks this
assumption. The dirty mapping check for passthrough mode was designed
around this assumption and is performed during table creation, causing
the check to fail with preload while metadata updates are ongoing. This
risks loading dirty mappings into passthrough mode, resulting in data
loss.

Reproduce steps:

1. Create a writeback cache with zero migration_threshold to produce
   dirty mappings

dmsetup create cmeta --table "0 8192 linear /dev/sdc 0"
dmsetup create cdata --table "0 131072 linear /dev/sdc 8192"
dmsetup create corig --table "0 262144 linear /dev/sdc 262144"
dd if=/dev/zero of=/dev/mapper/cmeta bs=4k count=1 oflag=direct
dmsetup create cache --table "0 262144 cache /dev/mapper/cmeta \
/dev/mapper/cdata /dev/mapper/corig 128 2 metadata2 writeback smq \
2 migration_threshold 0"

2. Preload a table in passthrough mode

dmsetup reload cache --table "0 262144 cache /dev/mapper/cmeta \
/dev/mapper/cdata /dev/mapper/corig 128 2 metadata2 passthrough smq 0"

3. Write to the first cache block to make it dirty

fio --filename=/dev/mapper/cache --name=populate --rw=write --bs=4k \
--direct=1 --size=64k

4. Resume the inactive table. Now it's possible to load the dirty block
   into passthrough mode.

dmsetup resume cache

Fix by moving the checks to the preresume phase to support table
preloading. Also remove the unused function dm_cache_metadata_all_clean.

https://git.kernel.org/stable/c/01b22656d8a68dbeae59f8b80866e7b11936b20a

https://git.kernel.org/stable/c/12105c7f18375d7615dad7605d89eadae7eb12a6

https://git.kernel.org/stable/c/1443c32f24d6d8bcdf4beceef2afc09290b98717

https://git.kernel.org/stable/c/21c503d60a257e54ca3ac58e2721bd24501d5bde

https://git.kernel.org/stable/c/322586745bd1a0e5f3559fd1635fdeb4dbd1d6b8

https://git.kernel.org/stable/c/5c98a3f1d7a554c9e920aa31daf92af6b5bbb8cc

https://git.kernel.org/stable/c/bd5a2c1018938e6b32670728bdb32a3f0efff00f

https://git.kernel.org/stable/c/c2e86f647561fcf5e1c6eba7d75e9e0c4299c94d

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