Vulnerability CVE-2023-52437
Published: 2024-02-20

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

Revert "md/raid5: Wait for MD_SB_CHANGE_PENDING in raid5d"

This reverts commit 5e2cf333b7bd5d3e62595a44d598a254c697cd74.

That commit introduced the following race and can cause system hung.

md_write_start: raid5d:
// mddev->in_sync == 1
set "MD_SB_CHANGE_PENDING"
// running before md_write_start wakeup it
waiting "MD_SB_CHANGE_PENDING" cleared
>>>>>>>>> hung
wakeup mddev->thread
...
waiting "MD_SB_CHANGE_PENDING" cleared
>>>> hung, raid5d should clear this flag
but get hung by same flag.

The issue reverted commit fixing is fixed by last patch in a new way.

 References:
https://git.kernel.org/stable/c/84c39986fe6dd77aa15f08712339f5d4eb7dbe27
https://git.kernel.org/stable/c/bed0acf330b2c50c688f6d9cfbcac2aa57a8e613
https://git.kernel.org/stable/c/cfa46838285814c3a27faacf7357f0a65bb5d152
https://git.kernel.org/stable/c/e16a0bbdb7e590a6607b0d82915add738c03c069
https://git.kernel.org/stable/c/aab69ef769707ad987ff905d79e0bd6591812580
https://git.kernel.org/stable/c/0de40f76d567133b871cd6ad46bb87afbce46983
https://git.kernel.org/stable/c/87165c64fe1a98bbab7280c58df3c83be2c98478
https://git.kernel.org/stable/c/bed9e27baf52a09b7ba2a3714f1e24e17ced386d
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