Vulnerability CVE-2023-52774
Published: 2024-05-21

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

s390/dasd: protect device queue against concurrent access

In dasd_profile_start() the amount of requests on the device queue are
counted. The access to the device queue is unprotected against
concurrent access. With a lot of parallel I/O, especially with alias
devices enabled, the device queue can change while dasd_profile_start()
is accessing the queue. In the worst case this leads to a kernel panic
due to incorrect pointer accesses.

Fix this by taking the device lock before accessing the queue and
counting the requests. Additionally the check for a valid profile data
pointer can be done earlier to avoid unnecessary locking in a hot path.

 References:
https://git.kernel.org/stable/c/ebdc569a07a3e8dbe66b4184922ad6f88ac0b96f
https://git.kernel.org/stable/c/f75617cc8df4155374132f0b500b0b3ebb967458
https://git.kernel.org/stable/c/f1ac7789406e2ca9ac51c41ad2daa597f47bdd4d
https://git.kernel.org/stable/c/c841de6247e94e07566d57163d3c0d8b29278f7a
https://git.kernel.org/stable/c/6062c527d0403cef27c54b91ac8390c3a497b250
https://git.kernel.org/stable/c/dc96fde8fcb2b896fd6c64802a7f4ece2e69b0be
https://git.kernel.org/stable/c/9372aab5d0ff621ea203c8c603e7e5f75e888240
https://git.kernel.org/stable/c/db46cd1e0426f52999d50fa72cfa97fa39952885
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