CVE-2024-35794

/// Technical description

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

dm-raid: really frozen sync_thread during suspend

1) commit f52f5c71f3d4 ("md: fix stopping sync thread") remove

MD_RECOVERY_FROZEN from __md_stop_writes() and doesn't realize that

dm-raid relies on __md_stop_writes() to frozen sync_thread

indirectly. Fix this problem by adding MD_RECOVERY_FROZEN in

md_stop_writes(), and since stop_sync_thread() is only used for

dm-raid in this case, also move stop_sync_thread() to

md_stop_writes().

2) The flag MD_RECOVERY_FROZEN doesn't mean that sync thread is frozen,

it only prevent new sync_thread to start, and it can't stop the

running sync thread; In order to frozen sync_thread, after seting the

flag, stop_sync_thread() should be used.

3) The flag MD_RECOVERY_FROZEN doesn't mean that writes are stopped, use

it as condition for md_stop_writes() in raid_postsuspend() doesn't

look correct. Consider that reentrant stop_sync_thread() do nothing,

a

/// Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

/// References