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Change History

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

drm/msm/a7xx: Call CP_RESET_CONTEXT_STATE

Calling this packet is necessary when we switch contexts because there
are various pieces of state used by userspace to synchronize between BR
and BV that are persistent across submits and we need to make sure that
they are in a "safe" state when switching contexts. Otherwise a
userspace submission in one context could cause another context to
function incorrectly and hang, effectively a denial of service (although
without leaking data). This was missed during initial a7xx bringup.

Patchwork: https://patchwork.freedesktop.org/patch/654924/

https://git.kernel.org/stable/c/2b520c6104f34e3a548525173c38ebca4402cac3

https://git.kernel.org/stable/c/35fe72f3c425bbf1d580bd9066e2456b1dbae4a8

https://git.kernel.org/stable/c/8a1f52651dd8203695d293c6824d8f6c067877d1