[Bug 102322] System crashes after "[drm] IP block:gmc_v8_0 is hung!" / [drm] IP block:sdma_v3_0 is hung!

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=102322

--- Comment #35 from Andrey Grodzovsky <andrey.grodzovsky at amd.com> ---
(In reply to dwagner from comment #30)
> (In reply to Andrey Grodzovsky from comment #29)
> > > (If that is a Mesa issue, no more than user processes / X11 should have
> > > crashed - but not the kernel amdgpu driver... right?)
> > 
> > Not exactly, MESA could create a bad request (faulty GPU address) which
> > would lead to this. It can even be triggered on purpose using a debug flag
> > from MESA.
> 
> My understanding is that all parts of MESA run as user processes, outside of
> the kernel space. If such code is allowed to pass parameters into kernel
> functions that make the kernel crash, that would be a veritable security
> hole which attackers could exploit to stage at least denial-of-service
> attacks, if not worse.

There is no impact on the kernlel, please note that this is a GPU page fault,
not CPU page fault so the kernel keeps working normal, doesn't hang and
workable. You might get black screen out of this and have to reboot the graphic
card or maybe the entire system to recover but I don't see any system security
and stability compromise here.

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