Vulnerability CVE-2024-43863
Published: 2024-08-21

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

drm/vmwgfx: Fix a deadlock in dma buf fence polling

Introduce a version of the fence ops that on release doesn't remove
the fence from the pending list, and thus doesn't require a lock to
fix poll->fence wait->fence unref deadlocks.

vmwgfx overwrites the wait callback to iterate over the list of all
fences and update their status, to do that it holds a lock to prevent
the list modifcations from other threads. The fence destroy callback
both deletes the fence and removes it from the list of pending
fences, for which it holds a lock.

dma buf polling cb unrefs a fence after it's been signaled: so the poll
calls the wait, which signals the fences, which are being destroyed.
The destruction tries to acquire the lock on the pending fences list
which it can never get because it's held by the wait from which it
was called.

Old bug, but not a lot of userspace apps were using dma-buf polling
interfaces. Fix those, in particular this fixes KDE stalls/deadlock.

 References:
https://git.kernel.org/stable/c/9e20d028d8d1deb1e7fed18f22ffc01669cf3237
https://git.kernel.org/stable/c/3b933b16c996af8adb6bc1b5748a63dfb41a82bc
https://git.kernel.org/stable/c/a8943969f9ead2fd3044fc826140a21622ef830e
https://git.kernel.org/stable/c/c98ab18b9f315ff977c2c65d7c71298ef98be8e3
https://git.kernel.org/stable/c/e58337100721f3cc0c7424a18730e4f39844934f
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