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drm/i915/gvt: Add valid length check for MI variable commands

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Add valid length check for the commands with variable length.

v2: remove the macro definition. (Zhenyu)
v3: refine the LRI command. (Zhenyu)

Reviewed-by: Zhenyu Wang <zhenyuw@linux.intel.com>
Signed-off-by: Gao, Fred <fred.gao@intel.com>
Signed-off-by: Zhenyu Wang <zhenyuw@linux.intel.com>
This commit is contained in:
Gao, Fred 2019-07-18 09:39:18 +08:00 committed by Zhenyu Wang
parent 1e2adc0d03
commit 00a33be406
1 changed files with 52 additions and 0 deletions
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52
drivers/gpu/drm/i915/gvt/cmd_parser.c
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@ -374,6 +374,9 @@ typedef int (*parser_cmd_handler)(struct parser_exec_state *s);
#define ADDR_FIX_4(x1, x2, x3, x4) (ADDR_FIX_1(x1) | ADDR_FIX_3(x2, x3, x4))
#define ADDR_FIX_5(x1, x2, x3, x4, x5) (ADDR_FIX_1(x1) | ADDR_FIX_4(x2, x3, x4, x5))
#define DWORD_FIELD(dword, end, start) \
FIELD_GET(GENMASK(end, start), cmd_val(s, dword))
#define OP_LENGTH_BIAS 2
#define CMD_LEN(value) (value + OP_LENGTH_BIAS)
@ -960,6 +963,18 @@ static int cmd_handler_lri(struct parser_exec_state *s)
int i, ret = 0;
int cmd_len = cmd_length(s);
struct intel_gvt *gvt = s->vgpu->gvt;
u32 valid_len = CMD_LEN(1);
/*
* Official intel docs are somewhat sloppy , check the definition of
* MI_LOAD_REGISTER_IMM.
*/
#define MAX_VALID_LEN 127
if ((cmd_len < valid_len) || (cmd_len > MAX_VALID_LEN)) {
gvt_err("len is not valid: len=%u valid_len=%u\n",
cmd_len, valid_len);
return -EFAULT;
}
for (i = 1; i < cmd_len; i += 2) {
if (IS_BROADWELL(gvt->dev_priv) && s->ring_id != RCS0) {
@ -1391,6 +1406,15 @@ static int cmd_handler_mi_display_flip(struct parser_exec_state *s)
int ret;
int i;
int len = cmd_length(s);
u32 valid_len = CMD_LEN(1);
/* Flip Type == Stereo 3D Flip */
if (DWORD_FIELD(2, 1, 0) == 2)
valid_len++;
ret = gvt_check_valid_cmd_length(cmd_length(s),
valid_len);
if (ret)
return ret;
ret = decode_mi_display_flip(s, &info);
if (ret) {
@ -1510,12 +1534,21 @@ static int cmd_handler_mi_store_data_imm(struct parser_exec_state *s)
int op_size = (cmd_length(s) - 3) * sizeof(u32);
int core_id = (cmd_val(s, 2) & (1 << 0)) ? 1 : 0;
unsigned long gma, gma_low, gma_high;
u32 valid_len = CMD_LEN(2);
int ret = 0;
/* check ppggt */
if (!(cmd_val(s, 0) & (1 << 22)))
return 0;
/* check if QWORD */
if (DWORD_FIELD(0, 21, 21))
valid_len++;
ret = gvt_check_valid_cmd_length(cmd_length(s),
valid_len);
if (ret)
return ret;
gma = cmd_val(s, 2) & GENMASK(31, 2);
if (gmadr_bytes == 8) {
@ -1558,11 +1591,20 @@ static int cmd_handler_mi_op_2f(struct parser_exec_state *s)
int op_size = (1 << ((cmd_val(s, 0) & GENMASK(20, 19)) >> 19)) *
sizeof(u32);
unsigned long gma, gma_high;
u32 valid_len = CMD_LEN(1);
int ret = 0;
if (!(cmd_val(s, 0) & (1 << 22)))
return ret;
/* check if QWORD */
if (DWORD_FIELD(0, 20, 19) == 1)
valid_len += 8;
ret = gvt_check_valid_cmd_length(cmd_length(s),
valid_len);
if (ret)
return ret;
gma = cmd_val(s, 1) & GENMASK(31, 2);
if (gmadr_bytes == 8) {
gma_high = cmd_val(s, 2) & GENMASK(15, 0);
@ -1600,6 +1642,16 @@ static int cmd_handler_mi_flush_dw(struct parser_exec_state *s)
bool index_mode = false;
int ret = 0;
u32 hws_pga, val;
u32 valid_len = CMD_LEN(2);
ret = gvt_check_valid_cmd_length(cmd_length(s),
valid_len);
if (ret) {
/* Check again for Qword */
ret = gvt_check_valid_cmd_length(cmd_length(s),
++valid_len);
return ret;
}
/* Check post-sync and ppgtt bit */
if (((cmd_val(s, 0) >> 14) & 0x3) && (cmd_val(s, 1) & (1 << 2))) {