On Sat, 2004-03-13 at 17:35, Jon Smirl wrote: > --- Michel Dnzer <[EMAIL PROTECTED]> wrote: > > On Sat, 2004-03-13 at 04:54, Jon Smirl wrote: > > > > > > A fourth call will be a driver specific call for setting the video mode. I > > am > > > implementing this by completely computing the register values needed to set > > the > > > mode in user space. I then pass these as a struct to the IOCTL and the > > driver > > > sets the mode. Doing it this way moves about 100K of code (in the radeon > > case vs > > > framebuffer) out of the kernel and into user space. > > > > Is the verification of the input data really that much smaller? > > Yes. Big chunks of Benh's driver and the mode parts of fb can easily be moved to > user space. It only took a couple of days. Mode setting code is seldom used as > compared to an interrupt handler, this gives the space back for more important > things and eliminates the need to security audit the code.
The security audit still needs to happen somewhere. Does the DRM code validate the user data? > It's also much easier to debug. That I can imagine. > It's a path to providing more controlled access to the graphics hardware. Right > now we have a free for all when every app and device driver can just do what it > wants to the hardware. I don't see what prevents that in your scheme. > Although I haven't written the code yet, I intend to add a output-only console > driver entry point to DRM. Since mode setting is now tracked through the DRM > driver it will be possible to display a kernel oops that occurs while running > xserver. This is something framebuffer can't currently do. Actually it can, or at least it did at some point, been a while since I've experienced a panic. :) -- Earthling Michel DÃnzer | Debian (powerpc), X and DRI developer Libre software enthusiast | http://svcs.affero.net/rm.php?r=daenzer ------------------------------------------------------- This SF.Net email is sponsored by: IBM Linux Tutorials Free Linux tutorial presented by Daniel Robbins, President and CEO of GenToo technologies. Learn everything from fundamentals to system administration.http://ads.osdn.com/?ad_id=1470&alloc_id=3638&op=click -- _______________________________________________ Dri-devel mailing list [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/dri-devel
