[vdr] Re: KVDR with DXR3?

[Guido Fiala <gfiala@s.netic.de>]

On Saturday, 14. June 2003 08:49, Clemens Kirchgatterer wrote:
> Guido Fiala <gfiala@s.netic.de> wrote:
> > That is exactly what i suggest - the dvb-driver could theretically
> > emulate the missing parts of an budget card all in itself to make it
> > look like a full featured one to vdr.
> >
> > the other devices the driver normally has, will appear exactly the
> > same but instead of using the card to decompress it will call libmpeg2
> > and instead of the hardware for the OSD it will use software to render
> > an image and add it too the frame "written" to /dev/videoX.
>
> that would mean libmpeg2 and osd render code running in kernel space. i
> doubt you will find many people calling this a good idea. IIRC, there
> has allready been discussions on this topic, probably on the linux-dvb
> ML

That's a point ;-) 
Although running a overlay-decoder card is a security risk as well - just let 
it overwrite part of main-memory by accident. How? v4l-conf set's the 
base-adress and it's a user-space program. Earlier versions of the dvb-driver 
did'nt even protect running v4l-conf as user, bttv always required it to run 
as root.

Maybe Linux should adapt some of the Idea's of the next Windoze?
One can imagine a more fine grained security control within kernel space...

Another idea?


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