On 08/22/2018 10:54 AM, Daniel Vetter wrote: > DRM drivers really, really, really don't want random userspace to > share buffer behind it's back, bypassing the dma-buf buffer sharing > machanism. For that reason we've ruthlessly rejected any IOCTL > exposing the physical address of any graphics buffer. > > Unfortunately fbdev comes with that built-in. We could just set > smem_start to 0, but that means we'd have to hand-roll our own fb_mmap > implementation. For good reasons many drivers do that, but > smem_start/length is still super convenient. > > Hence instead just stop the leak in the ioctl, to keep fb mmap working > as-is. A second patch will set this flag for all drm drivers. > > Cc: Bartlomiej Zolnierkiewicz <b.zolnierkie@xxxxxxxxxxx> > Cc: Kees Cook <keescook@xxxxxxxxxxxx> > Cc: Daniel Vetter <daniel.vetter@xxxxxxxx> > Cc: linux-fbdev@xxxxxxxxxxxxxxx > Signed-off-by: Daniel Vetter <daniel.vetter@xxxxxxxxx> Acked-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@xxxxxxxxxxx> Best regards, -- Bartlomiej Zolnierkiewicz Samsung R&D Institute Poland Samsung Electronics _______________________________________________ dri-devel mailing list dri-devel@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/dri-devel
