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https://bugs.freedesktop.org/show_bug.cgi?id=943
------- Additional Comments From [EMAIL PROTECTED] 2005-05-17 03:25 -------
> A comment w.r.t. generating hashed handles: there are some cases where the
> radeon family of client-side DRI drivers do arithmetic to generate handles. I
> *think* this is only for AGP memory. I have a suspicion that the X server may
> also generate handles for the registers and/or the framebuffer by reading the
> device's PCI bus address registers, but I would need to verify that.
This is totally broken behavior. It is very poor design. I have encountered such
cases (but I don't think the Radeon driver contained any of them - however the
MGA driver did.) I fixed all of them. Fortunately there were not too many.
There are better ways to obtain the information that is needed than to rely on
the handle to contain a certain piece of information.
> Anyway, the point is that the handles can't be completely arbitrary for all
> types of mappings, at least not without checking a lot of code...
Well, for some mappings we may be able to pass on the old values (if they fit
into 32 bit) This is what my latest code does. It still produces ambiguities
which need to be resolved.
I'm going to attach a patch to my latest version of the code that addresses some
security problems.
The code can be compied to use either the old or new ioctl32 sceme.
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