--- Stephane Marchesin <[EMAIL PROTECTED]> wrote:
> Michel D�nzer wrote:
>
> >
> >>+ // allocate the surface
> >>+ for(i=0;i<8;i++)
> >>+ if (!(dev_priv->surfaces&(1<<i)))
> >>+ break;
> >>+
> >>+ if (i>=8)
> >>+ return DRM_ERR(ENOMEM);
> >>+ else
> >>+ dev_priv->surfaces&=(1<<i);
> >>+
> >>+ if ( DRM_COPY_TO_USER( &alloc.surface, &i,
> >>+ sizeof(int) ) ) {
> >>+ DRM_ERROR( "copy_to_user\n" );
> >>+ return DRM_ERR(EFAULT);
> >>
> >
> >IMHO it should also manage the ranges (prevent overlapping, ...) and
> >parameters of the surfaces.
> >
> Ok, that was one of my doubts.
> So if we go that route, it would manage the ranges, prevent overlapping,
>
> and also try to "spare" the surfaces by merging adjacent ones with
> similar properties.
>
> >
> >
> >>+ DRM_COPY_FROM_USER_IOCTL( memfree, (drm_radeon_mem_free_t __user
> *)data,
> >>+ sizeof(memfree) );
> >>+
> >>+ dev_priv->surfaces&= (~(1<<memfree.surface));
> >>
> >
> >It should definitely ensure that only the owner can free a surface
> >though. It would also need to free a client's surfaces if it dies, etc.
> >
> How do you "know" the owner ? I'm not sure the pid would be enough.
>
I'm sure there is a better way, also keep inmind GLX-remote direct
rendering.
For now using the PID to get the UID and EUID would allow any process by
that user to dealloc the reasource(for threaded programs).
> Stephane
>
>
>
>
>
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