CVE-2022-48887

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

drm/vmwgfx: Remove rcu locks from user resources

User resource lookups used rcu to avoid two extra atomics. Unfortunately

the rcu paths were buggy and it was easy to make the driver crash by

submitting command buffers from two different threads. Because the

lookups never show up in performance profiles replace them with a

regular spin lock which fixes the races in accesses to those shared

resources.

Fixes kernel oops'es in IGT's vmwgfx execution_buffer stress test and

seen crashes with apps using shared resources.