CVE-2024-35793 Information

Description

In the Linux kernel the following vulnerability has been resolved:

debugfs: fix wait/cancellation handling during remove

Ben Greear further reports deadlocks during concurrent debugfs remove while files are being accessed even though the code in question now uses debugfs cancellations. Turns out that despite all the review on the locking we missed completely that the logic is wrong: if the refcount hits zero we can finish (and need not wait for the completion) but if it doesn’t we have to trigger all the cancellations. As written we can never get into the loop triggering the cancellations. Fix this and explain it better while at it.

Reference

https://git.kernel.org/stable/c/e88b5ae01901c4a655a53158397746334778a57b https://git.kernel.org/stable/c/3d08cca5fd0aabb62b7015067ab40913b33da906 https://git.kernel.org/stable/c/952c3fce297f12c7ff59380adb66b564e2bc9b64