Deadlock Affecting kernel-tools-libs package, versions *

Note: Versions mentioned in the description apply only to the upstream kernel-tools-libs package and not the kernel-tools-libs package as distributed by Centos. See How to fix? for Centos:7 relevant fixed versions and status.

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.

• https://access.redhat.com/security/cve/CVE-2024-35793
• https://git.kernel.org/stable/c/3d08cca5fd0aabb62b7015067ab40913b33da906
• https://git.kernel.org/stable/c/952c3fce297f12c7ff59380adb66b564e2bc9b64
• https://git.kernel.org/stable/c/e88b5ae01901c4a655a53158397746334778a57b