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CVE-2024-26757
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Description
In the Linux kernel, the following vulnerability has been resolved:
md: Don’t ignore read-only array in md_check_recovery()
Usually if the array is not read-write, md_check_recovery() won’t
register new sync_thread in the first place. And if the array is
read-write and sync_thread is registered, md_set_readonly() will
unregister sync_thread before setting the array read-only. md/raid
follow this behavior hence there is no problem.
After commit f52f5c71f3d4 (“md: fix stopping sync thread”), following
hang can be triggered by test shell/integrity-caching.sh:
array is read-only. dm-raid update super block:
rs_update_sbs
ro = mddev->ro
mddev->ro = 0
–> set array read-write
md_update_sbregister new sync thread concurrently.
dm-raid set array back to read-only:
rs_update_sbs
mddev->ro = rostop the array:
raid_dtr
md_stop
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))sync thread done:
md_do_sync
set_bit(MD_RECOVERY_DONE, &mddev->recovery);
md_wakeup_thread(mddev->thread);daemon thread can’t unregister sync thread:
md_check_recovery
if (!md_is_rdwr(mddev) &&
!test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))
return;
–> –> MD_RECOVERY_RUNNING can’t be cleared, hence step 4 hang;
The root cause is that dm-raid manipulate ‘mddev->ro’ by itself,
however, dm-raid really should stop sync thread before setting the
array read-only. Unfortunately, I need to read more code before I
can refacter the handler of ‘mddev->ro’ in dm-raid, hence let’s fix
the problem the easy way for now to prevent dm-raid regression.
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