drm: radeon: only allow specific type-3 packetss through verifier

only allow specific type-3 packets to pass the verifier instead of all for r100/r200 as others might be unsafe (r300 already does this), and add checking for these we need but aren't safe. Check the RADEON_CP_INDX_BUFFER packet on both r200 and r300 as it isn't safe neither.

Signed-off-by: Dave Airlie <airlied@linux.ie>

1 files changed, 106 insertions, 3 deletions

diff --git a/drivers/char/drm/radeon_state.c b/drivers/char/drm/radeon_state.c
index feac5f005d47..6e04fdd732ac 100644
--- a/drivers/char/drm/radeon_state.c
+++ b/drivers/char/drm/radeon_state.c
@@ -275,6 +275,8 @@ static __inline__ int radeon_check_and_fixup_packet3(drm_radeon_private_t *
                                                      unsigned int *cmdsz)
 {
         u32 *cmd = (u32 *) cmdbuf->buf;
+        u32 offset, narrays;
+        int count, i, k;
 
         *cmdsz = 2 + ((cmd[0] & RADEON_CP_PACKET_COUNT_MASK) >> 16);
 
@@ -288,10 +290,106 @@ static __inline__ int radeon_check_and_fixup_packet3(drm_radeon_private_t *
                 return DRM_ERR(EINVAL);
         }
 
-        /* Check client state and fix it up if necessary */
-        if (cmd[0] & 0x8000) {  /* MSB of opcode: next DWORD GUI_CNTL */
-                u32 offset;
+        switch(cmd[0] & 0xff00) {
+        /* XXX Are there old drivers needing other packets? */
 
+        case RADEON_3D_DRAW_IMMD:
+        case RADEON_3D_DRAW_VBUF:
+        case RADEON_3D_DRAW_INDX:
+        case RADEON_WAIT_FOR_IDLE:
+        case RADEON_CP_NOP:
+        case RADEON_3D_CLEAR_ZMASK:
+/*      case RADEON_CP_NEXT_CHAR:
+        case RADEON_CP_PLY_NEXTSCAN:
+        case RADEON_CP_SET_SCISSORS: */ /* probably safe but will never need them? */
+                /* these packets are safe */
+                break;
+
+        case RADEON_CP_3D_DRAW_IMMD_2:
+        case RADEON_CP_3D_DRAW_VBUF_2:
+        case RADEON_CP_3D_DRAW_INDX_2:
+        case RADEON_3D_CLEAR_HIZ:
+                /* safe but r200 only */
+                if (dev_priv->microcode_version != UCODE_R200) {
+                        DRM_ERROR("Invalid 3d packet for r100-class chip\n");
+                        return DRM_ERR(EINVAL);
+                }
+                break;
+
+        case RADEON_3D_LOAD_VBPNTR:
+                count = (cmd[0] >> 16) & 0x3fff;
+
+                if (count > 18) { /* 12 arrays max */
+                        DRM_ERROR("Too large payload in 3D_LOAD_VBPNTR (count=%d)\n",
+                                  count);
+                        return DRM_ERR(EINVAL);
+                }
+
+                /* carefully check packet contents */
+                narrays = cmd[1] & ~0xc000;
+                k = 0;
+                i = 2;
+                while ((k < narrays) && (i < (count + 2))) {
+                        i++;            /* skip attribute field */
+                        if (radeon_check_and_fixup_offset(dev_priv, filp_priv, &cmd[i])) {
+                                DRM_ERROR
+                                    ("Invalid offset (k=%d i=%d) in 3D_LOAD_VBPNTR packet.\n",
+                                     k, i);
+                                return DRM_ERR(EINVAL);
+                        }
+                        k++;
+                        i++;
+                        if (k == narrays)
+                                break;
+                        /* have one more to process, they come in pairs */
+                        if (radeon_check_and_fixup_offset(dev_priv, filp_priv, &cmd[i])) {
+                                DRM_ERROR
+                                    ("Invalid offset (k=%d i=%d) in 3D_LOAD_VBPNTR packet.\n",
+                                     k, i);
+                                return DRM_ERR(EINVAL);
+                        }
+                        k++;
+                        i++;
+                }
+                /* do the counts match what we expect ? */
+                if ((k != narrays) || (i != (count + 2))) {
+                        DRM_ERROR
+                            ("Malformed 3D_LOAD_VBPNTR packet (k=%d i=%d narrays=%d count+1=%d).\n",
+                              k, i, narrays, count + 1);
+                        return DRM_ERR(EINVAL);
+                }
+                break;
+
+        case RADEON_3D_RNDR_GEN_INDX_PRIM:
+                if (dev_priv->microcode_version != UCODE_R100) {
+                        DRM_ERROR("Invalid 3d packet for r200-class chip\n");
+                        return DRM_ERR(EINVAL);
+                }
+                if (radeon_check_and_fixup_offset(dev_priv, filp_priv, &cmd[1])) {
+                                DRM_ERROR("Invalid rndr_gen_indx offset\n");
+                                return DRM_ERR(EINVAL);
+                }
+                break;
+
+        case RADEON_CP_INDX_BUFFER:
+                if (dev_priv->microcode_version != UCODE_R200) {
+                        DRM_ERROR("Invalid 3d packet for r100-class chip\n");
+                        return DRM_ERR(EINVAL);
+                }
+                if ((cmd[1] & 0x8000ffff) != 0x80000810) {
+                        DRM_ERROR("Invalid indx_buffer reg address %08X\n", cmd[1]);
+                        return DRM_ERR(EINVAL);
+                }
+                if (radeon_check_and_fixup_offset(dev_priv, filp_priv, &cmd[2])) {
+                        DRM_ERROR("Invalid indx_buffer offset is %08X\n", cmd[2]);
+                        return DRM_ERR(EINVAL);
+                }
+                break;
+
+        case RADEON_CNTL_HOSTDATA_BLT:
+        case RADEON_CNTL_PAINT_MULTI:
+        case RADEON_CNTL_BITBLT_MULTI:
+                /* MSB of opcode: next DWORD GUI_CNTL */
                 if (cmd[1] & (RADEON_GMC_SRC_PITCH_OFFSET_CNTL
                               | RADEON_GMC_DST_PITCH_OFFSET_CNTL)) {
                         offset = cmd[2] << 10;
@@ -313,6 +411,11 @@ static __inline__ int radeon_check_and_fixup_packet3(drm_radeon_private_t *
                         }
                         cmd[3] = (cmd[3] & 0xffc00000) | offset >> 10;
                 }
+                break;
+
+        default:
+                DRM_ERROR("Invalid packet type %x\n", cmd[0] & 0xff00);
+                return DRM_ERR(EINVAL);
         }
 
         return 0;