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Subject[PATCH 3.2 17/27] drm: fix DRM_IOCTL_MODE_GETFB handle-leak
3.2.66-rc1 review patch.  If anyone has any objections, please let me know.


From: David Herrmann <>

commit 101b96f32956ee99bf1468afaf572b88cda9f88b upstream.

DRM_IOCTL_MODE_GETFB is used to retrieve information about a given
framebuffer ID. It is a read-only helper and was thus declassified for
unprivileged access in:

commit a14b1b42477c5ef089fcda88cbaae50d979eb8f9
Author: Mandeep Singh Baines <>
Date: Fri Jan 20 12:11:16 2012 -0800

drm: remove master fd restriction on mode setting getters

However, alongside width, height and stride information,
DRM_IOCTL_MODE_GETFB also passes back a handle to the underlying buffer of
the framebuffer. This handle allows users to mmap() it and read or write
into it. Obviously, this should be restricted to DRM-Master.

With the current setup, *any* process with access to /dev/dri/card0 (which
means any process with access to hardware-accelerated rendering) can
access the current screen framebuffer and modify it ad libitum.

For backwards-compatibility reasons we want to keep the
DRM_IOCTL_MODE_GETFB call unprivileged. Besides, it provides quite useful
information regarding screen setup. So we simply test whether the caller
is the current DRM-Master and if not, we return 0 as handle, which is
always invalid. A following DRM_IOCTL_GEM_CLOSE on this handle will fail
with EINVAL, but we accept this. Users shouldn't test for errors during
GEM_CLOSE, anyway. And it is still better as a failing MODE_GETFB call.

v2: add capable(CAP_SYS_ADMIN) check for compatibility with i-g-t

Signed-off-by: David Herrmann <>
Reviewed-by: Chris Wilson <>
Signed-off-by: Dave Airlie <>
[bwh: Backported to 3.2:
- drm_framebuffer_funcs::create_handle must be non-null
- Adjust context, indentation]
Signed-off-by: Ben Hutchings <>
--- a/drivers/gpu/drm/drm_crtc.c
+++ b/drivers/gpu/drm/drm_crtc.c
@@ -1815,7 +1815,17 @@ int drm_mode_getfb(struct drm_device *de
r->depth = fb->depth;
r->bpp = fb->bits_per_pixel;
r->pitch = fb->pitch;
- fb->funcs->create_handle(fb, file_priv, &r->handle);
+ if (file_priv->is_master || capable(CAP_SYS_ADMIN)) {
+ ret = fb->funcs->create_handle(fb, file_priv, &r->handle);
+ } else {
+ /* GET_FB() is an unprivileged ioctl so we must not
+ * return a buffer-handle to non-master processes! For
+ * backwards-compatibility reasons, we cannot make
+ * GET_FB() privileged, so just return an invalid handle
+ * for non-masters. */
+ r->handle = 0;
+ ret = 0;
+ }


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