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 <mandeep.baines@xxxxxxxxx>
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
Cc: <stable@xxxxxxxxxxxxxxx>
Signed-off-by: David Herrmann <dh.herrmann@xxxxxxxxx>
---
drivers/gpu/drm/drm_crtc.c | 18 +++++++++++++++---
1 file changed, 15 insertions(+), 3 deletions(-)
diff --git a/drivers/gpu/drm/drm_crtc.c b/drivers/gpu/drm/drm_crtc.c
index 54b4169..a05e878 100644
--- a/drivers/gpu/drm/drm_crtc.c
+++ b/drivers/gpu/drm/drm_crtc.c
@@ -2598,10 +2598,22 @@ int drm_mode_getfb(struct drm_device *dev,
r->depth = fb->depth;
r->bpp = fb->bits_per_pixel;
r->pitch = fb->pitches[0];
- if (fb->funcs->create_handle)
- ret = fb->funcs->create_handle(fb, file_priv, &r->handle);
- else
+ if (fb->funcs->create_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;
+ }
+ } else {
ret = -ENODEV;
+ }
drm_framebuffer_unreference(fb);
--
1.8.4
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