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PUBLISHED

CVE-2024-26758

md: Don't ignore suspended array in md_check_recovery()

Reserved:2024-02-19
Published:2024-04-03
Updated:2024-04-04

Description

In the Linux kernel, the following vulnerability has been resolved: md: Don't ignore suspended array in md_check_recovery() mddev_suspend() never stop sync_thread, hence it doesn't make sense to ignore suspended array in md_check_recovery(), which might cause sync_thread can't be unregistered. After commit f52f5c71f3d4 ("md: fix stopping sync thread"), following hang can be triggered by test shell/integrity-caching.sh: 1) suspend the array: raid_postsuspend mddev_suspend 2) stop the array: raid_dtr md_stop __md_stop_writes stop_sync_thread set_bit(MD_RECOVERY_INTR, &mddev->recovery); md_wakeup_thread_directly(mddev->sync_thread); wait_event(..., !test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) 3) sync thread done: md_do_sync set_bit(MD_RECOVERY_DONE, &mddev->recovery); md_wakeup_thread(mddev->thread); 4) daemon thread can't unregister sync thread: md_check_recovery if (mddev->suspended) return; -> return directly md_read_sync_thread clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery); -> MD_RECOVERY_RUNNING can't be cleared, hence step 2 hang; This problem is not just related to dm-raid, fix it by ignoring suspended array in md_check_recovery(). And follow up patches will improve dm-raid better to frozen sync thread during suspend.

Product status

Default status
unaffected

68866e425be2 before a55f0d6179a1
affected

68866e425be2 before 1baae052cccd
affected

Default status
affected

3.0
affected

Any version before 3.0
unaffected

6.7.7
unaffected

6.8
unaffected

References

https://git.kernel.org/stable/c/a55f0d6179a19c6b982e2dc344d58c98647a3be0

https://git.kernel.org/stable/c/1baae052cccd08daf9a9d64c3f959d8cdb689757

cve.org CVE-2024-26758

nvd.nist.gov CVE-2024-26758

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