[Intel-gfx] [RFC 10/22] drm/i915: Reject unsafe commands

[bradley.d.volkin at intel.com]

From: Brad Volkin <bradley.d.volkin at intel.com>

These commands allow userspace to affect global state.

OTC-Tracker: AXIA-4631
Change-Id: I80a22c9cd83181790d2a9064e70ea09326691b66
Signed-off-by: Brad Volkin <bradley.d.volkin at intel.com>
---
 drivers/gpu/drm/i915/i915_cmd_parser.c | 15 +++++++++------
 1 file changed, 9 insertions(+), 6 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_cmd_parser.c b/drivers/gpu/drm/i915/i915_cmd_parser.c
index 99d15f3..8ee4cda 100644
--- a/drivers/gpu/drm/i915/i915_cmd_parser.c
+++ b/drivers/gpu/drm/i915/i915_cmd_parser.c
@@ -47,6 +47,7 @@
 #define SMFX STD_MFX_OPCODE_MASK
 #define F CMD_DESC_FIXED
 #define S CMD_DESC_SKIP
+#define R CMD_DESC_REJECT
 
 /*            Command                          Mask   Fixed Len   Action
 	      ---------------------------------------------------------- */
@@ -57,10 +58,11 @@ static const struct drm_i915_cmd_descriptor common_cmds[] = {
 	CMD(  MI_ARB_CHECK,                     SMI,    F,  1,      S  ),
 	CMD(  MI_REPORT_HEAD,                   SMI,    F,  1,      S  ),
 	CMD(  MI_SUSPEND_FLUSH,                 SMI,    F,  1,      S  ),
-	CMD(  MI_SEMAPHORE_MBOX,                SMI,   !F,  0xFF,   S  ),
+	CMD(  MI_SEMAPHORE_MBOX,                SMI,   !F,  0xFF,   R  ),
 	CMD(  MI_STORE_DWORD_IMM,               SMI,   !F,  0x3FF,  S  ),
-	CMD(  MI_STORE_DWORD_INDEX,             SMI,   !F,  0xFF,   S  ),
+	CMD(  MI_STORE_DWORD_INDEX,             SMI,   !F,  0xFF,   R  ),
 	CMD(  MI_LOAD_REGISTER_IMM(1),          SMI,   !F,  0xFF,   S  ),
+	CMD(  MI_UPDATE_GTT,                    SMI,   !F,  0xFF,   R  ),
 	CMD(  MI_STORE_REGISTER_MEM(1),         SMI,   !F,  0xFF,   S  ),
 	CMD(  MI_LOAD_REGISTER_MEM,             SMI,   !F,  0xFF,   S  ),
 	CMD(  MI_BATCH_BUFFER_START,            SMI,   !F,  0xFF,   S  ),
@@ -68,8 +70,8 @@ static const struct drm_i915_cmd_descriptor common_cmds[] = {
 
 static const struct drm_i915_cmd_descriptor render_cmds[] = {
 	CMD(  MI_FLUSH,                         SMI,    F,  1,      S  ),
-	CMD(  MI_ARB_ON_OFF,                    SMI,    F,  1,      S  ),
-	CMD(  MI_DISPLAY_FLIP,                  SMI,   !F,  0xFF,   S  ),
+	CMD(  MI_ARB_ON_OFF,                    SMI,    F,  1,      R  ),
+	CMD(  MI_DISPLAY_FLIP,                  SMI,   !F,  0xFF,   R  ),
 	CMD(  MI_PREDICATE,                     SMI,    F,  1,      S  ),
 	CMD(  MI_TOPOLOGY_FILTER,               SMI,    F,  1,      S  ),
 	CMD(  MI_CLFLUSH,                       SMI,   !F,  0x3FF,  S  ),
@@ -94,12 +96,12 @@ static const struct drm_i915_cmd_descriptor hsw_render_cmds[] = {
 };
 
 static const struct drm_i915_cmd_descriptor video_cmds[] = {
-	CMD(  MI_ARB_ON_OFF,                    SMI,    F,  1,      S  ),
+	CMD(  MI_ARB_ON_OFF,                    SMI,    F,  1,      R  ),
 	CMD(  MFX_WAIT,                         SMFX,  !F,  0x3F,   S  ),
 };
 
 static const struct drm_i915_cmd_descriptor blt_cmds[] = {
-	CMD(  MI_DISPLAY_FLIP,                  SMI,   !F,  0xFF,   S  ),
+	CMD(  MI_DISPLAY_FLIP,                  SMI,   !F,  0xFF,   R  ),
 	CMD(  COLOR_BLT,                        S2D,   !F,  0x3F,   S  ),
 	CMD(  SRC_COPY_BLT,                     S2D,   !F,  0x3F,   S  ),
 };
@@ -111,6 +113,7 @@ static const struct drm_i915_cmd_descriptor blt_cmds[] = {
 #undef SMFX
 #undef F
 #undef S
+#undef R
 
 static const struct drm_i915_cmd_table gen7_render_cmds[] = {
 	{ common_cmds, ARRAY_SIZE(common_cmds) },
-- 
1.8.4.4