[Mesa-dev] [Bug 91889] Planetary Anihilation: Titans display content of other processes buffers

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=91889

--- Comment #5 from Albert Freeman <albertwdfreeman at gmail.com> ---
The GPU has its own physical ram that is managed with a completely different
system than system ram.

There are actually two issues here. One is the bug in the game causing strange
behavior. The other is the security issue that just so happens to (sometimes)
arise due to that bug.

This is probably not going to work, but try:
export MESA_EXTENSION_OVERRIDE=GL_ARB_gpu_shader5
then run the game in the same console window.

That seems to get rid of a rather critical warning when I replay the trace.

Strange thing is, when I replay this on mesa and catalyst, the same visual
corruption occurs (in the areas I can remember, exactly the same). Though
catalyst shows no warnings/errors but mesa does. This shouldn't happen as
apitrace simply records GL commands/data before they reach the driver. When
replayed they get sent to my driver for display.

Someone on irc commented that apitrace does not always capture all data needed
to display the replay flawlessly. However the corruption seems to be in areas
which shouldn't (in normal circumstances) be affected by missing data (as far
as I know) (e.g. empty sky OR big things crosscutting many different bits of
geometry/UI, like rectangles).

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