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Change History

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

dm: fix a race condition in retrieve_deps

There's a race condition in the multipath target when retrieve_deps
races with multipath_message calling dm_get_device and dm_put_device.
retrieve_deps walks the list of open devices without holding any lock
but multipath may add or remove devices to the list while it is
running. The end result may be memory corruption or use-after-free
memory access.

See this description of a UAF with multipath_message():
https://listman.redhat.com/archives/dm-devel/2022-October/052373.html

Fix this bug by introducing a new rw semaphore "devices_lock". We grab
devices_lock for read in retrieve_deps and we grab it for write in
dm_get_device and dm_put_device.

https://git.kernel.org/stable/c/38f6e5ae5d9ff4a4050ea6f7b543d5d5a4e087cf

https://git.kernel.org/stable/c/dbf1a719850577bb51fc7512a3972994b797a17b

https://git.kernel.org/stable/c/f6007dce0cd35d634d9be91ef3515a6385dcee16