[RFC] drm: add unref_fb ioctl

[Daniel Vetter]

On Tue, May 9, 2017 at 5:36 PM, Rob Clark <robdclark at gmail.com> wrote:
> Disadvantages:
>   * depending on userspace architecture, layers left on screen could
>     be considered an information leak, ie. new incoming master process
>     has access to buffers that are still being scanned out.

I'm not sure this is much of a problem really, or at least I suspect
we have bigger issues: the GETFB ioctl allows you to get at the gem bo
behind any framebuffer, as long as you're the current master. There's
no need for that framebuffer to be active on the screen. Not sure
that's a good idea really, we might want to fix up that ioctl to only
hand out the backing storage objects for currently active objects. But
kinda separate issue.

Other
-Daniel
-- 
Daniel Vetter
Software Engineer, Intel Corporation
+41 (0) 79 365 57 48 - http://blog.ffwll.ch