Re: [R300] securing r300 drm

[Vladimir D. <vo...@mi...>]

On Tue, 21 Jun 2005, Eric Anholt wrote:

> On Tue, 2005-06-21 at 14:57 -0400, Vladimir Dergachev wrote:
>>  		/* Texture offset is dangerous and needs more checking */
>>  	ADD_RANGE(R300_TX_OFFSET_0, 16);
>>
>>          I don't think texture offsets are ever written to, however if they
>>          point in the wrong place they can be used to read memory directly.
>>
>>          ideally we would check these to be either with MC_FB_LOCATION
>>          or MC_AGP_LOCATION ranges. Problem is what do we do on PCI cards ?
>>          use AIC controller settings ?
>
> Just verify that the location is within expected areas of the card's
> virtual address space, like you do for color/depth offsets, right?

Yes, the question is what these are for PCI cards. I guess AIC should have 
a register similar to MC_AGP_LOCATION.

                 best

                     Vladimir Dergachev

>
> -- 
> Eric Anholt                                     et...@lc...
> http://people.freebsd.org/~anholt/              anholt@FreeBSD.org
>