CVE-2024-35808 Information

Description

In the Linux kernel the following vulnerability has been resolved:

md/dm-raid: don’t call md_reap_sync_thread() directly

Currently md_reap_sync_thread() is called from raid_message() directly without holding ‘reconfig_mutex’ this is definitely unsafe because md_reap_sync_thread() can change many fields that is protected by ‘reconfig_mutex’.

However hold ‘reconfig_mutex’ here is still problematic because this will cause deadlock for example commit 130443d60b1b (\md: refactor idle/frozen_sync_thread() to fix deadlock).

Fix this problem by using stop_sync_thread() to unregister sync_thread like md/raid did.

Reference

https://git.kernel.org/stable/c/347dcdc15a1706f61aa545ae498ededdf31aeebc https://git.kernel.org/stable/c/9e59b8d76ff511505eb0dd1478329f09e0f04669 https://git.kernel.org/stable/c/cd32b27a66db8776d8b8e82ec7d7dde97a8693b0