CVE-2024-26758

Description

In the Linux kernel, the following vulnerability has been resolved:md: Dont ignore suspended array in md_check_recovery()mddev_suspend() never stop sync_thread, hence it doesnt make sense toignore suspended array in md_check_recovery(), which might causesync_thread cant be unregistered.After commit f52f5c71f3d4 (md: fix stopping sync thread), followinghang can be triggered by test shell/integrity-caching.sh:1) suspend the array:raid_postsuspend mddev_suspend2) 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 cant 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 cant be cleared, hence step 2 hang;This problem is not just related to dm-raid, fix it by ignoringsuspended array in md_check_recovery(). And follow up patches willimprove dm-raid better to frozen sync thread during suspend.

Risk Information

Associated Vulnerability

Patch Details

References

https://nvd.nist.gov/vuln/detail/CVE-2023-1234
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-1234