[Nouveau] [Bug 73473] Potential crash bug in src/gallium/auxiliary/rtasm/rtasm_execmem.c

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=73473

--- Comment #4 from Jaak Ristioja <jaak at ristioja.ee> ---
(In reply to comment #3)
> Created attachment 91834 [details] [review]
> gallium/rtasm: add support for SELinux
> 
> You're absolutely right here. Seems like there aren't many hardened/selinux
> users of the gallium drivers.
> 
> The attached patch should do the job, can you give it a try ?

I tried the patch on Mesa 5.1.9 under Gentoo.

patching file src/gallium/auxiliary/rtasm/rtasm_execmem.c
Hunk #1 succeeded at 60 (offset -1 lines).
Hunk #2 succeeded at 72 (offset -1 lines).
Hunk #3 succeeded at 90 (offset -1 lines).
Hunk #4 succeeded at 103 (offset -1 lines).
Hunk #5 succeeded at 115 (offset -1 lines).

Running headless over SSH I could not verify today that the glxgears were
actually shown in X, but here are the results I got:

$ DISPLAY=:0.0 glxgears
Running synchronized to the vertical refresh.  The framerate should be
approximately the same as the monitor refresh rate.
29168 frames in 5.0 seconds = 5833.411 FPS
29463 frames in 5.0 seconds = 5892.528 FPS
...

This still gives the kernel message of RWX mmap being denied which is normal.

$ DISPLAY=:0.0 LIBGL_ALWAYS_SOFTWARE=1 glxgears
LLVM ERROR: Allocation failed when allocating new memory in the JIT
Can't allocate RWX Memory: Operation not permitted

This also gives the kernel message, but exits immediately after with exit
status 1.

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