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drm/uapi: Validate the mode flags/type

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Currently userspace is allowed to feed in any king of garbage in the
high bits of the mode flags/type, as are drivers when probing modes.
Reject any mode with bogus flags/type.

Hopefully this won't break any current userspace...

v2: Split the type and flags checks to separates ifs (Chris)

Cc: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Jose Abreu <Jose.Abreu@synopsys.com>
Cc: Adam Jackson <ajax@redhat.com>
Cc: Keith Packard <keithp@keithp.com>
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: Adam Jackson <ajax@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20171115154913.23827-1-ville.syrjala@linux.intel.com
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Ville Syrjälä 2017-11-15 17:49:13 +02:00
parent 064a3e6e8e
commit c6ed6dad5c
2 changed files with 30 additions and 0 deletions
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6
drivers/gpu/drm/drm_modes.c
View File

@ -1036,6 +1036,12 @@ EXPORT_SYMBOL(drm_mode_equal_no_clocks_no_stereo);
enum drm_mode_status
drm_mode_validate_basic(const struct drm_display_mode *mode)
{
if (mode->type & ~DRM_MODE_TYPE_ALL)
return MODE_BAD;
if (mode->flags & ~DRM_MODE_FLAG_ALL)
return MODE_BAD;
if ((mode->flags & DRM_MODE_FLAG_3D_MASK) > DRM_MODE_FLAG_3D_MAX)
return MODE_BAD;

24
include/uapi/drm/drm_mode.h
View File

@ -46,6 +46,14 @@ extern "C" {
#define DRM_MODE_TYPE_USERDEF (1<<5)
#define DRM_MODE_TYPE_DRIVER (1<<6)
#define DRM_MODE_TYPE_ALL (DRM_MODE_TYPE_BUILTIN | \
DRM_MODE_TYPE_CLOCK_C | \
DRM_MODE_TYPE_CRTC_C | \
DRM_MODE_TYPE_PREFERRED | \
DRM_MODE_TYPE_DEFAULT | \
DRM_MODE_TYPE_USERDEF | \
DRM_MODE_TYPE_DRIVER)
/* Video mode flags */
/* bit compatible with the xrandr RR_ definitions (bits 0-13)
*
@ -99,6 +107,22 @@ extern "C" {
#define DRM_MODE_FLAG_PIC_AR_16_9 \
(DRM_MODE_PICTURE_ASPECT_16_9<<19)
#define DRM_MODE_FLAG_ALL (DRM_MODE_FLAG_PHSYNC | \
DRM_MODE_FLAG_NHSYNC | \
DRM_MODE_FLAG_PVSYNC | \
DRM_MODE_FLAG_NVSYNC | \
DRM_MODE_FLAG_INTERLACE | \
DRM_MODE_FLAG_DBLSCAN | \
DRM_MODE_FLAG_CSYNC | \
DRM_MODE_FLAG_PCSYNC | \
DRM_MODE_FLAG_NCSYNC | \
DRM_MODE_FLAG_HSKEW | \
DRM_MODE_FLAG_BCAST | \
DRM_MODE_FLAG_PIXMUX | \
DRM_MODE_FLAG_DBLCLK | \
DRM_MODE_FLAG_CLKDIV2 | \
DRM_MODE_FLAG_3D_MASK)
/* DPMS flags */
/* bit compatible with the xorg definitions. */
#define DRM_MODE_DPMS_ON 0