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>
diff --git a/drivers/char/drm/radeon_state.c b/drivers/char/drm/radeon_state.c
index feac5f0..6e04fdd 100644
--- a/drivers/char/drm/radeon_state.c
+++ b/drivers/char/drm/radeon_state.c
@@ -275,6 +275,8 @@
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 @@
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 @@
}
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;