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Code Issues Releases Wiki Activity
linux-stable/tools/testing/selftests/bpf/verifier/bounds.c
Daniel Borkmann 973377ffe8 bpf, selftests: Adjust few selftest outcomes wrt unreachable code 
In almost all cases from test_verifier that have been changed in here, we've
had an unreachable path with a load from a register which has an invalid
address on purpose. This was basically to make sure that we never walk this
path and to have the verifier complain if it would otherwise. Change it to
match on the right error for unprivileged given we now test these paths
under speculative execution.

There's one case where we match on exact # of insns_processed. Due to the
extra path, this will of course mismatch on unprivileged. Thus, restrict the
test->insn_processed check to privileged-only.

In one other case, we result in a 'pointer comparison prohibited' error. This
is similarly due to verifying an 'invalid' branch where we end up with a value
pointer on one side of the comparison.

Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Reviewed-by: John Fastabend <john.fastabend@gmail.com>
Acked-by: Alexei Starovoitov <ast@kernel.org>
2021-06-14 23:06:38 +02:00

755 lines
24 KiB
C
Raw Blame History

{
"subtraction bounds (map value) variant 1",
.insns = {
BPF_ST_MEM(BPF_DW, BPF_REG_10, -8, 0),
BPF_MOV64_REG(BPF_REG_2, BPF_REG_10),
BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, -8),
BPF_LD_MAP_FD(BPF_REG_1, 0),
BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_map_lookup_elem),
BPF_JMP_IMM(BPF_JEQ, BPF_REG_0, 0, 9),
BPF_LDX_MEM(BPF_B, BPF_REG_1, BPF_REG_0, 0),
BPF_JMP_IMM(BPF_JGT, BPF_REG_1, 0xff, 7),
BPF_LDX_MEM(BPF_B, BPF_REG_3, BPF_REG_0, 1),
BPF_JMP_IMM(BPF_JGT, BPF_REG_3, 0xff, 5),
BPF_ALU64_REG(BPF_SUB, BPF_REG_1, BPF_REG_3),
BPF_ALU64_IMM(BPF_RSH, BPF_REG_1, 56),
BPF_ALU64_REG(BPF_ADD, BPF_REG_0, BPF_REG_1),
BPF_LDX_MEM(BPF_B, BPF_REG_0, BPF_REG_0, 0),
BPF_EXIT_INSN(),
BPF_MOV64_IMM(BPF_REG_0, 0),
BPF_EXIT_INSN(),
},
.fixup_map_hash_8b = { 3 },
.errstr = "R0 max value is outside of the allowed memory range",
.result = REJECT,
},
{
"subtraction bounds (map value) variant 2",
.insns = {
BPF_ST_MEM(BPF_DW, BPF_REG_10, -8, 0),
BPF_MOV64_REG(BPF_REG_2, BPF_REG_10),
BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, -8),
BPF_LD_MAP_FD(BPF_REG_1, 0),
BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_map_lookup_elem),
BPF_JMP_IMM(BPF_JEQ, BPF_REG_0, 0, 8),
BPF_LDX_MEM(BPF_B, BPF_REG_1, BPF_REG_0, 0),
BPF_JMP_IMM(BPF_JGT, BPF_REG_1, 0xff, 6),
BPF_LDX_MEM(BPF_B, BPF_REG_3, BPF_REG_0, 1),
BPF_JMP_IMM(BPF_JGT, BPF_REG_3, 0xff, 4),
BPF_ALU64_REG(BPF_SUB, BPF_REG_1, BPF_REG_3),
BPF_ALU64_REG(BPF_ADD, BPF_REG_0, BPF_REG_1),
BPF_LDX_MEM(BPF_B, BPF_REG_0, BPF_REG_0, 0),
BPF_EXIT_INSN(),
BPF_MOV64_IMM(BPF_REG_0, 0),
BPF_EXIT_INSN(),
},
.fixup_map_hash_8b = { 3 },
.errstr = "R0 min value is negative, either use unsigned index or do a if (index >=0) check.",
.errstr_unpriv = "R1 has unknown scalar with mixed signed bounds",
.result = REJECT,
},
{
"check subtraction on pointers for unpriv",
.insns = {
BPF_MOV64_IMM(BPF_REG_0, 0),
BPF_LD_MAP_FD(BPF_REG_ARG1, 0),
BPF_MOV64_REG(BPF_REG_ARG2, BPF_REG_FP),
BPF_ALU64_IMM(BPF_ADD, BPF_REG_ARG2, -8),
BPF_ST_MEM(BPF_DW, BPF_REG_ARG2, 0, 9),
BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_map_lookup_elem),
BPF_MOV64_REG(BPF_REG_9, BPF_REG_FP),
BPF_ALU64_REG(BPF_SUB, BPF_REG_9, BPF_REG_0),
BPF_LD_MAP_FD(BPF_REG_ARG1, 0),
BPF_MOV64_REG(BPF_REG_ARG2, BPF_REG_FP),
BPF_ALU64_IMM(BPF_ADD, BPF_REG_ARG2, -8),
BPF_ST_MEM(BPF_DW, BPF_REG_ARG2, 0, 0),
BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_map_lookup_elem),
BPF_JMP_IMM(BPF_JNE, BPF_REG_0, 0, 1),
BPF_EXIT_INSN(),
BPF_STX_MEM(BPF_DW, BPF_REG_0, BPF_REG_9, 0),
BPF_MOV64_IMM(BPF_REG_0, 0),
BPF_EXIT_INSN(),
},
.fixup_map_hash_8b = { 1, 9 },
.result = ACCEPT,
.result_unpriv = REJECT,
.errstr_unpriv = "R9 pointer -= pointer prohibited",
},
{
"bounds check based on zero-extended MOV",
.insns = {
BPF_ST_MEM(BPF_DW, BPF_REG_10, -8, 0),
BPF_MOV64_REG(BPF_REG_2, BPF_REG_10),
BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, -8),
BPF_LD_MAP_FD(BPF_REG_1, 0),
BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_map_lookup_elem),
BPF_JMP_IMM(BPF_JEQ, BPF_REG_0, 0, 4),
/* r2 = 0x0000'0000'ffff'ffff */
BPF_MOV32_IMM(BPF_REG_2, 0xffffffff),
/* r2 = 0 */
BPF_ALU64_IMM(BPF_RSH, BPF_REG_2, 32),
/* no-op */
BPF_ALU64_REG(BPF_ADD, BPF_REG_0, BPF_REG_2),
/* access at offset 0 */
BPF_LDX_MEM(BPF_B, BPF_REG_0, BPF_REG_0, 0),
/* exit */
BPF_MOV64_IMM(BPF_REG_0, 0),
BPF_EXIT_INSN(),
},
.fixup_map_hash_8b = { 3 },
.result = ACCEPT
},
{
"bounds check based on sign-extended MOV. test1",
.insns = {
BPF_ST_MEM(BPF_DW, BPF_REG_10, -8, 0),
BPF_MOV64_REG(BPF_REG_2, BPF_REG_10),
BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, -8),
BPF_LD_MAP_FD(BPF_REG_1, 0),
BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_map_lookup_elem),
BPF_JMP_IMM(BPF_JEQ, BPF_REG_0, 0, 4),
/* r2 = 0xffff'ffff'ffff'ffff */
BPF_MOV64_IMM(BPF_REG_2, 0xffffffff),
/* r2 = 0xffff'ffff */
BPF_ALU64_IMM(BPF_RSH, BPF_REG_2, 32),
/* r0 = <oob pointer> */
BPF_ALU64_REG(BPF_ADD, BPF_REG_0, BPF_REG_2),
/* access to OOB pointer */
BPF_LDX_MEM(BPF_B, BPF_REG_0, BPF_REG_0, 0),
/* exit */
BPF_MOV64_IMM(BPF_REG_0, 0),
BPF_EXIT_INSN(),
},
.fixup_map_hash_8b = { 3 },
.errstr = "map_value pointer and 4294967295",
.result = REJECT
},
{
"bounds check based on sign-extended MOV. test2",
.insns = {
BPF_ST_MEM(BPF_DW, BPF_REG_10, -8, 0),
BPF_MOV64_REG(BPF_REG_2, BPF_REG_10),
BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, -8),
BPF_LD_MAP_FD(BPF_REG_1, 0),
BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_map_lookup_elem),
BPF_JMP_IMM(BPF_JEQ, BPF_REG_0, 0, 4),
/* r2 = 0xffff'ffff'ffff'ffff */
BPF_MOV64_IMM(BPF_REG_2, 0xffffffff),
/* r2 = 0xfff'ffff */
BPF_ALU64_IMM(BPF_RSH, BPF_REG_2, 36),
/* r0 = <oob pointer> */
BPF_ALU64_REG(BPF_ADD, BPF_REG_0, BPF_REG_2),
/* access to OOB pointer */
BPF_LDX_MEM(BPF_B, BPF_REG_0, BPF_REG_0, 0),
/* exit */
BPF_MOV64_IMM(BPF_REG_0, 0),
BPF_EXIT_INSN(),
},
.fixup_map_hash_8b = { 3 },
.errstr = "R0 min value is outside of the allowed memory range",
.result = REJECT
},
{
"bounds check based on reg_off + var_off + insn_off. test1",
.insns = {
BPF_LDX_MEM(BPF_W, BPF_REG_6, BPF_REG_1,
offsetof(struct __sk_buff, mark)),
BPF_ST_MEM(BPF_DW, BPF_REG_10, -8, 0),
BPF_MOV64_REG(BPF_REG_2, BPF_REG_10),
BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, -8),
BPF_LD_MAP_FD(BPF_REG_1, 0),
BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_map_lookup_elem),
BPF_JMP_IMM(BPF_JEQ, BPF_REG_0, 0, 4),
BPF_ALU64_IMM(BPF_AND, BPF_REG_6, 1),
BPF_ALU64_IMM(BPF_ADD, BPF_REG_6, (1 << 29) - 1),
BPF_ALU64_REG(BPF_ADD, BPF_REG_0, BPF_REG_6),
BPF_ALU64_IMM(BPF_ADD, BPF_REG_0, (1 << 29) - 1),
BPF_LDX_MEM(BPF_B, BPF_REG_0, BPF_REG_0, 3),
BPF_MOV64_IMM(BPF_REG_0, 0),
BPF_EXIT_INSN(),
},
.fixup_map_hash_8b = { 4 },
.errstr = "value_size=8 off=1073741825",
.result = REJECT,
.prog_type = BPF_PROG_TYPE_SCHED_CLS,
},
{
"bounds check based on reg_off + var_off + insn_off. test2",
.insns = {
BPF_LDX_MEM(BPF_W, BPF_REG_6, BPF_REG_1,
offsetof(struct __sk_buff, mark)),
BPF_ST_MEM(BPF_DW, BPF_REG_10, -8, 0),
BPF_MOV64_REG(BPF_REG_2, BPF_REG_10),
BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, -8),
BPF_LD_MAP_FD(BPF_REG_1, 0),
BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_map_lookup_elem),
BPF_JMP_IMM(BPF_JEQ, BPF_REG_0, 0, 4),
BPF_ALU64_IMM(BPF_AND, BPF_REG_6, 1),
BPF_ALU64_IMM(BPF_ADD, BPF_REG_6, (1 << 30) - 1),
BPF_ALU64_REG(BPF_ADD, BPF_REG_0, BPF_REG_6),
BPF_ALU64_IMM(BPF_ADD, BPF_REG_0, (1 << 29) - 1),
BPF_LDX_MEM(BPF_B, BPF_REG_0, BPF_REG_0, 3),
BPF_MOV64_IMM(BPF_REG_0, 0),
BPF_EXIT_INSN(),
},
.fixup_map_hash_8b = { 4 },
.errstr = "value 1073741823",
.result = REJECT,
.prog_type = BPF_PROG_TYPE_SCHED_CLS,
},
{
"bounds check after truncation of non-boundary-crossing range",
.insns = {
BPF_ST_MEM(BPF_DW, BPF_REG_10, -8, 0),
BPF_MOV64_REG(BPF_REG_2, BPF_REG_10),
BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, -8),
BPF_LD_MAP_FD(BPF_REG_1, 0),
BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_map_lookup_elem),
BPF_JMP_IMM(BPF_JEQ, BPF_REG_0, 0, 9),
/* r1 = [0x00, 0xff] */
BPF_LDX_MEM(BPF_B, BPF_REG_1, BPF_REG_0, 0),
BPF_MOV64_IMM(BPF_REG_2, 1),
/* r2 = 0x10'0000'0000 */
BPF_ALU64_IMM(BPF_LSH, BPF_REG_2, 36),
/* r1 = [0x10'0000'0000, 0x10'0000'00ff] */
BPF_ALU64_REG(BPF_ADD, BPF_REG_1, BPF_REG_2),
/* r1 = [0x10'7fff'ffff, 0x10'8000'00fe] */
BPF_ALU64_IMM(BPF_ADD, BPF_REG_1, 0x7fffffff),
/* r1 = [0x00, 0xff] */
BPF_ALU32_IMM(BPF_SUB, BPF_REG_1, 0x7fffffff),
/* r1 = 0 */
BPF_ALU64_IMM(BPF_RSH, BPF_REG_1, 8),
/* no-op */
BPF_ALU64_REG(BPF_ADD, BPF_REG_0, BPF_REG_1),
/* access at offset 0 */
BPF_LDX_MEM(BPF_B, BPF_REG_0, BPF_REG_0, 0),
/* exit */
BPF_MOV64_IMM(BPF_REG_0, 0),
BPF_EXIT_INSN(),
},
.fixup_map_hash_8b = { 3 },
.result = ACCEPT
},
{
"bounds check after truncation of boundary-crossing range (1)",
.insns = {
BPF_ST_MEM(BPF_DW, BPF_REG_10, -8, 0),
BPF_MOV64_REG(BPF_REG_2, BPF_REG_10),
BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, -8),
BPF_LD_MAP_FD(BPF_REG_1, 0),
BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_map_lookup_elem),
BPF_JMP_IMM(BPF_JEQ, BPF_REG_0, 0, 8),
/* r1 = [0x00, 0xff] */
BPF_LDX_MEM(BPF_B, BPF_REG_1, BPF_REG_0, 0),
BPF_ALU64_IMM(BPF_ADD, BPF_REG_1, 0xffffff80 >> 1),
/* r1 = [0xffff'ff80, 0x1'0000'007f] */
BPF_ALU64_IMM(BPF_ADD, BPF_REG_1, 0xffffff80 >> 1),
/* r1 = [0xffff'ff80, 0xffff'ffff] or
* [0x0000'0000, 0x0000'007f]
*/
BPF_ALU32_IMM(BPF_ADD, BPF_REG_1, 0),
BPF_ALU64_IMM(BPF_SUB, BPF_REG_1, 0xffffff80 >> 1),
/* r1 = [0x00, 0xff] or
* [0xffff'ffff'0000'0080, 0xffff'ffff'ffff'ffff]
*/
BPF_ALU64_IMM(BPF_SUB, BPF_REG_1, 0xffffff80 >> 1),
/* error on OOB pointer computation */
BPF_ALU64_REG(BPF_ADD, BPF_REG_0, BPF_REG_1),
/* exit */
BPF_MOV64_IMM(BPF_REG_0, 0),
BPF_EXIT_INSN(),
},
.fixup_map_hash_8b = { 3 },
/* not actually fully unbounded, but the bound is very high */
.errstr = "value -4294967168 makes map_value pointer be out of bounds",
.result = REJECT,
},
{
"bounds check after truncation of boundary-crossing range (2)",
.insns = {
BPF_ST_MEM(BPF_DW, BPF_REG_10, -8, 0),
BPF_MOV64_REG(BPF_REG_2, BPF_REG_10),
BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, -8),
BPF_LD_MAP_FD(BPF_REG_1, 0),
BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_map_lookup_elem),
BPF_JMP_IMM(BPF_JEQ, BPF_REG_0, 0, 8),
/* r1 = [0x00, 0xff] */
BPF_LDX_MEM(BPF_B, BPF_REG_1, BPF_REG_0, 0),
BPF_ALU64_IMM(BPF_ADD, BPF_REG_1, 0xffffff80 >> 1),
/* r1 = [0xffff'ff80, 0x1'0000'007f] */
BPF_ALU64_IMM(BPF_ADD, BPF_REG_1, 0xffffff80 >> 1),
/* r1 = [0xffff'ff80, 0xffff'ffff] or
* [0x0000'0000, 0x0000'007f]
* difference to previous test: truncation via MOV32
* instead of ALU32.
*/
BPF_MOV32_REG(BPF_REG_1, BPF_REG_1),
BPF_ALU64_IMM(BPF_SUB, BPF_REG_1, 0xffffff80 >> 1),
/* r1 = [0x00, 0xff] or
* [0xffff'ffff'0000'0080, 0xffff'ffff'ffff'ffff]
*/
BPF_ALU64_IMM(BPF_SUB, BPF_REG_1, 0xffffff80 >> 1),
/* error on OOB pointer computation */
BPF_ALU64_REG(BPF_ADD, BPF_REG_0, BPF_REG_1),
/* exit */
BPF_MOV64_IMM(BPF_REG_0, 0),
BPF_EXIT_INSN(),
},
.fixup_map_hash_8b = { 3 },
.errstr = "value -4294967168 makes map_value pointer be out of bounds",
.result = REJECT,
},
{
"bounds check after wrapping 32-bit addition",
.insns = {
BPF_ST_MEM(BPF_DW, BPF_REG_10, -8, 0),
BPF_MOV64_REG(BPF_REG_2, BPF_REG_10),
BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, -8),
BPF_LD_MAP_FD(BPF_REG_1, 0),
BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_map_lookup_elem),
BPF_JMP_IMM(BPF_JEQ, BPF_REG_0, 0, 5),
/* r1 = 0x7fff'ffff */
BPF_MOV64_IMM(BPF_REG_1, 0x7fffffff),
/* r1 = 0xffff'fffe */
BPF_ALU64_IMM(BPF_ADD, BPF_REG_1, 0x7fffffff),
/* r1 = 0 */
BPF_ALU32_IMM(BPF_ADD, BPF_REG_1, 2),
/* no-op */
BPF_ALU64_REG(BPF_ADD, BPF_REG_0, BPF_REG_1),
/* access at offset 0 */
BPF_LDX_MEM(BPF_B, BPF_REG_0, BPF_REG_0, 0),
/* exit */
BPF_MOV64_IMM(BPF_REG_0, 0),
BPF_EXIT_INSN(),
},
.fixup_map_hash_8b = { 3 },
.result = ACCEPT
},
{
"bounds check after shift with oversized count operand",
.insns = {
BPF_ST_MEM(BPF_DW, BPF_REG_10, -8, 0),
BPF_MOV64_REG(BPF_REG_2, BPF_REG_10),
BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, -8),
BPF_LD_MAP_FD(BPF_REG_1, 0),
BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_map_lookup_elem),
BPF_JMP_IMM(BPF_JEQ, BPF_REG_0, 0, 6),
BPF_MOV64_IMM(BPF_REG_2, 32),
BPF_MOV64_IMM(BPF_REG_1, 1),
/* r1 = (u32)1 << (u32)32 = ? */
BPF_ALU32_REG(BPF_LSH, BPF_REG_1, BPF_REG_2),
/* r1 = [0x0000, 0xffff] */
BPF_ALU64_IMM(BPF_AND, BPF_REG_1, 0xffff),
/* computes unknown pointer, potentially OOB */
BPF_ALU64_REG(BPF_ADD, BPF_REG_0, BPF_REG_1),
/* potentially OOB access */
BPF_LDX_MEM(BPF_B, BPF_REG_0, BPF_REG_0, 0),
/* exit */
BPF_MOV64_IMM(BPF_REG_0, 0),
BPF_EXIT_INSN(),
},
.fixup_map_hash_8b = { 3 },
.errstr = "R0 max value is outside of the allowed memory range",
.result = REJECT
},
{
"bounds check after right shift of maybe-negative number",
.insns = {
BPF_ST_MEM(BPF_DW, BPF_REG_10, -8, 0),
BPF_MOV64_REG(BPF_REG_2, BPF_REG_10),
BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, -8),
BPF_LD_MAP_FD(BPF_REG_1, 0),
BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_map_lookup_elem),
BPF_JMP_IMM(BPF_JEQ, BPF_REG_0, 0, 6),
/* r1 = [0x00, 0xff] */
BPF_LDX_MEM(BPF_B, BPF_REG_1, BPF_REG_0, 0),
/* r1 = [-0x01, 0xfe] */
BPF_ALU64_IMM(BPF_SUB, BPF_REG_1, 1),
/* r1 = 0 or 0xff'ffff'ffff'ffff */
BPF_ALU64_IMM(BPF_RSH, BPF_REG_1, 8),
/* r1 = 0 or 0xffff'ffff'ffff */
BPF_ALU64_IMM(BPF_RSH, BPF_REG_1, 8),
/* computes unknown pointer, potentially OOB */
BPF_ALU64_REG(BPF_ADD, BPF_REG_0, BPF_REG_1),
/* potentially OOB access */
BPF_LDX_MEM(BPF_B, BPF_REG_0, BPF_REG_0, 0),
/* exit */
BPF_MOV64_IMM(BPF_REG_0, 0),
BPF_EXIT_INSN(),
},
.fixup_map_hash_8b = { 3 },
.errstr = "R0 unbounded memory access",
.result = REJECT
},
{
"bounds check after 32-bit right shift with 64-bit input",
.insns = {
BPF_ST_MEM(BPF_DW, BPF_REG_10, -8, 0),
BPF_MOV64_REG(BPF_REG_2, BPF_REG_10),
BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, -8),
BPF_LD_MAP_FD(BPF_REG_1, 0),
BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_map_lookup_elem),
BPF_JMP_IMM(BPF_JEQ, BPF_REG_0, 0, 6),
/* r1 = 2 */
BPF_MOV64_IMM(BPF_REG_1, 2),
/* r1 = 1<<32 */
BPF_ALU64_IMM(BPF_LSH, BPF_REG_1, 31),
/* r1 = 0 (NOT 2!) */
BPF_ALU32_IMM(BPF_RSH, BPF_REG_1, 31),
/* r1 = 0xffff'fffe (NOT 0!) */
BPF_ALU32_IMM(BPF_SUB, BPF_REG_1, 2),
/* error on computing OOB pointer */
BPF_ALU64_REG(BPF_ADD, BPF_REG_0, BPF_REG_1),
/* exit */
BPF_MOV64_IMM(BPF_REG_0, 0),
BPF_EXIT_INSN(),
},
.fixup_map_hash_8b = { 3 },
.errstr = "math between map_value pointer and 4294967294 is not allowed",
.result = REJECT,
},
{
"bounds check map access with off+size signed 32bit overflow. test1",
.insns = {
BPF_ST_MEM(BPF_DW, BPF_REG_10, -8, 0),
BPF_MOV64_REG(BPF_REG_2, BPF_REG_10),
BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, -8),
BPF_LD_MAP_FD(BPF_REG_1, 0),
BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_map_lookup_elem),
BPF_JMP_IMM(BPF_JNE, BPF_REG_0, 0, 1),
BPF_EXIT_INSN(),
BPF_ALU64_IMM(BPF_ADD, BPF_REG_0, 0x7ffffffe),
BPF_LDX_MEM(BPF_DW, BPF_REG_0, BPF_REG_0, 0),
BPF_JMP_A(0),
BPF_EXIT_INSN(),
},
.fixup_map_hash_8b = { 3 },
.errstr = "map_value pointer and 2147483646",
.result = REJECT
},
{
"bounds check map access with off+size signed 32bit overflow. test2",
.insns = {
BPF_ST_MEM(BPF_DW, BPF_REG_10, -8, 0),
BPF_MOV64_REG(BPF_REG_2, BPF_REG_10),
BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, -8),
BPF_LD_MAP_FD(BPF_REG_1, 0),
BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_map_lookup_elem),
BPF_JMP_IMM(BPF_JNE, BPF_REG_0, 0, 1),
BPF_EXIT_INSN(),
BPF_ALU64_IMM(BPF_ADD, BPF_REG_0, 0x1fffffff),
BPF_ALU64_IMM(BPF_ADD, BPF_REG_0, 0x1fffffff),
BPF_ALU64_IMM(BPF_ADD, BPF_REG_0, 0x1fffffff),
BPF_LDX_MEM(BPF_DW, BPF_REG_0, BPF_REG_0, 0),
BPF_JMP_A(0),
BPF_EXIT_INSN(),
},
.fixup_map_hash_8b = { 3 },
.errstr = "pointer offset 1073741822",
.errstr_unpriv = "R0 pointer arithmetic of map value goes out of range",
.result = REJECT
},
{
"bounds check map access with off+size signed 32bit overflow. test3",
.insns = {
BPF_ST_MEM(BPF_DW, BPF_REG_10, -8, 0),
BPF_MOV64_REG(BPF_REG_2, BPF_REG_10),
BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, -8),
BPF_LD_MAP_FD(BPF_REG_1, 0),
BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_map_lookup_elem),
BPF_JMP_IMM(BPF_JNE, BPF_REG_0, 0, 1),
BPF_EXIT_INSN(),
BPF_ALU64_IMM(BPF_SUB, BPF_REG_0, 0x1fffffff),
BPF_ALU64_IMM(BPF_SUB, BPF_REG_0, 0x1fffffff),
BPF_LDX_MEM(BPF_DW, BPF_REG_0, BPF_REG_0, 2),
BPF_JMP_A(0),
BPF_EXIT_INSN(),
},
.fixup_map_hash_8b = { 3 },
.errstr = "pointer offset -1073741822",
.errstr_unpriv = "R0 pointer arithmetic of map value goes out of range",
.result = REJECT
},
{
"bounds check map access with off+size signed 32bit overflow. test4",
.insns = {
BPF_ST_MEM(BPF_DW, BPF_REG_10, -8, 0),
BPF_MOV64_REG(BPF_REG_2, BPF_REG_10),
BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, -8),
BPF_LD_MAP_FD(BPF_REG_1, 0),
BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_map_lookup_elem),
BPF_JMP_IMM(BPF_JNE, BPF_REG_0, 0, 1),
BPF_EXIT_INSN(),
BPF_MOV64_IMM(BPF_REG_1, 1000000),
BPF_ALU64_IMM(BPF_MUL, BPF_REG_1, 1000000),
BPF_ALU64_REG(BPF_ADD, BPF_REG_0, BPF_REG_1),
BPF_LDX_MEM(BPF_DW, BPF_REG_0, BPF_REG_0, 2),
BPF_JMP_A(0),
BPF_EXIT_INSN(),
},
.fixup_map_hash_8b = { 3 },
.errstr = "map_value pointer and 1000000000000",
.result = REJECT
},
{
"bounds check mixed 32bit and 64bit arithmetic. test1",
.insns = {
BPF_MOV64_IMM(BPF_REG_0, 0),
BPF_MOV64_IMM(BPF_REG_1, -1),
BPF_ALU64_IMM(BPF_LSH, BPF_REG_1, 32),
BPF_ALU64_IMM(BPF_ADD, BPF_REG_1, 1),
/* r1 = 0xffffFFFF00000001 */
BPF_JMP32_IMM(BPF_JGT, BPF_REG_1, 1, 3),
/* check ALU64 op keeps 32bit bounds */
BPF_ALU64_IMM(BPF_ADD, BPF_REG_1, 1),
BPF_JMP32_IMM(BPF_JGT, BPF_REG_1, 2, 1),
BPF_JMP_A(1),
/* invalid ldx if bounds are lost above */
BPF_LDX_MEM(BPF_DW, BPF_REG_0, BPF_REG_0, -1),
BPF_EXIT_INSN(),
},
.errstr_unpriv = "R0 invalid mem access 'inv'",
.result_unpriv = REJECT,
.result = ACCEPT
},
{
"bounds check mixed 32bit and 64bit arithmetic. test2",
.insns = {
BPF_MOV64_IMM(BPF_REG_0, 0),
BPF_MOV64_IMM(BPF_REG_1, -1),
BPF_ALU64_IMM(BPF_LSH, BPF_REG_1, 32),
BPF_ALU64_IMM(BPF_ADD, BPF_REG_1, 1),
/* r1 = 0xffffFFFF00000001 */
BPF_MOV64_IMM(BPF_REG_2, 3),
/* r1 = 0x2 */
BPF_ALU32_IMM(BPF_ADD, BPF_REG_1, 1),
/* check ALU32 op zero extends 64bit bounds */
BPF_JMP_REG(BPF_JGT, BPF_REG_1, BPF_REG_2, 1),
BPF_JMP_A(1),
/* invalid ldx if bounds are lost above */
BPF_LDX_MEM(BPF_DW, BPF_REG_0, BPF_REG_0, -1),
BPF_EXIT_INSN(),
},
.errstr_unpriv = "R0 invalid mem access 'inv'",
.result_unpriv = REJECT,
.result = ACCEPT
},
{
"assigning 32bit bounds to 64bit for wA = 0, wB = wA",
.insns = {
BPF_LDX_MEM(BPF_W, BPF_REG_8, BPF_REG_1,
offsetof(struct __sk_buff, data_end)),
BPF_LDX_MEM(BPF_W, BPF_REG_7, BPF_REG_1,
offsetof(struct __sk_buff, data)),
BPF_MOV32_IMM(BPF_REG_9, 0),
BPF_MOV32_REG(BPF_REG_2, BPF_REG_9),
BPF_MOV64_REG(BPF_REG_6, BPF_REG_7),
BPF_ALU64_REG(BPF_ADD, BPF_REG_6, BPF_REG_2),
BPF_MOV64_REG(BPF_REG_3, BPF_REG_6),
BPF_ALU64_IMM(BPF_ADD, BPF_REG_3, 8),
BPF_JMP_REG(BPF_JGT, BPF_REG_3, BPF_REG_8, 1),
BPF_LDX_MEM(BPF_W, BPF_REG_5, BPF_REG_6, 0),
BPF_MOV64_IMM(BPF_REG_0, 0),
BPF_EXIT_INSN(),
},
.prog_type = BPF_PROG_TYPE_SCHED_CLS,
.result = ACCEPT,
.flags = F_NEEDS_EFFICIENT_UNALIGNED_ACCESS,
},
{
"bounds check for reg = 0, reg xor 1",
.insns = {
BPF_ST_MEM(BPF_DW, BPF_REG_10, -8, 0),
BPF_MOV64_REG(BPF_REG_2, BPF_REG_10),
BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, -8),
BPF_LD_MAP_FD(BPF_REG_1, 0),
BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_map_lookup_elem),
BPF_JMP_IMM(BPF_JNE, BPF_REG_0, 0, 1),
BPF_EXIT_INSN(),
BPF_MOV64_IMM(BPF_REG_1, 0),
BPF_ALU64_IMM(BPF_XOR, BPF_REG_1, 1),
BPF_JMP_IMM(BPF_JNE, BPF_REG_1, 0, 1),
BPF_LDX_MEM(BPF_DW, BPF_REG_0, BPF_REG_0, 8),
BPF_MOV64_IMM(BPF_REG_0, 0),
BPF_EXIT_INSN(),
},
.errstr_unpriv = "R0 min value is outside of the allowed memory range",
.result_unpriv = REJECT,
.fixup_map_hash_8b = { 3 },
.result = ACCEPT,
},
{
"bounds check for reg32 = 0, reg32 xor 1",
.insns = {
BPF_ST_MEM(BPF_DW, BPF_REG_10, -8, 0),
BPF_MOV64_REG(BPF_REG_2, BPF_REG_10),
BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, -8),
BPF_LD_MAP_FD(BPF_REG_1, 0),
BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_map_lookup_elem),
BPF_JMP_IMM(BPF_JNE, BPF_REG_0, 0, 1),
BPF_EXIT_INSN(),
BPF_MOV32_IMM(BPF_REG_1, 0),
BPF_ALU32_IMM(BPF_XOR, BPF_REG_1, 1),
BPF_JMP32_IMM(BPF_JNE, BPF_REG_1, 0, 1),
BPF_LDX_MEM(BPF_DW, BPF_REG_0, BPF_REG_0, 8),
BPF_MOV64_IMM(BPF_REG_0, 0),
BPF_EXIT_INSN(),
},
.errstr_unpriv = "R0 min value is outside of the allowed memory range",
.result_unpriv = REJECT,
.fixup_map_hash_8b = { 3 },
.result = ACCEPT,
},
{
"bounds check for reg = 2, reg xor 3",
.insns = {
BPF_ST_MEM(BPF_DW, BPF_REG_10, -8, 0),
BPF_MOV64_REG(BPF_REG_2, BPF_REG_10),
BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, -8),
BPF_LD_MAP_FD(BPF_REG_1, 0),
BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_map_lookup_elem),
BPF_JMP_IMM(BPF_JNE, BPF_REG_0, 0, 1),
BPF_EXIT_INSN(),
BPF_MOV64_IMM(BPF_REG_1, 2),
BPF_ALU64_IMM(BPF_XOR, BPF_REG_1, 3),
BPF_JMP_IMM(BPF_JGT, BPF_REG_1, 0, 1),
BPF_LDX_MEM(BPF_DW, BPF_REG_0, BPF_REG_0, 8),
BPF_MOV64_IMM(BPF_REG_0, 0),
BPF_EXIT_INSN(),
},
.errstr_unpriv = "R0 min value is outside of the allowed memory range",
.result_unpriv = REJECT,
.fixup_map_hash_8b = { 3 },
.result = ACCEPT,
},
{
"bounds check for reg = any, reg xor 3",
.insns = {
BPF_ST_MEM(BPF_DW, BPF_REG_10, -8, 0),
BPF_MOV64_REG(BPF_REG_2, BPF_REG_10),
BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, -8),
BPF_LD_MAP_FD(BPF_REG_1, 0),
BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_map_lookup_elem),
BPF_JMP_IMM(BPF_JNE, BPF_REG_0, 0, 1),
BPF_EXIT_INSN(),
BPF_LDX_MEM(BPF_DW, BPF_REG_1, BPF_REG_0, 0),
BPF_ALU64_IMM(BPF_XOR, BPF_REG_1, 3),
BPF_JMP_IMM(BPF_JNE, BPF_REG_1, 0, 1),
BPF_LDX_MEM(BPF_DW, BPF_REG_0, BPF_REG_0, 8),
BPF_MOV64_IMM(BPF_REG_0, 0),
BPF_EXIT_INSN(),
},
.fixup_map_hash_8b = { 3 },
.result = REJECT,
.errstr = "invalid access to map value",
.errstr_unpriv = "invalid access to map value",
},
{
"bounds check for reg32 = any, reg32 xor 3",
.insns = {
BPF_ST_MEM(BPF_DW, BPF_REG_10, -8, 0),
BPF_MOV64_REG(BPF_REG_2, BPF_REG_10),
BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, -8),
BPF_LD_MAP_FD(BPF_REG_1, 0),
BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_map_lookup_elem),
BPF_JMP_IMM(BPF_JNE, BPF_REG_0, 0, 1),
BPF_EXIT_INSN(),
BPF_LDX_MEM(BPF_DW, BPF_REG_1, BPF_REG_0, 0),
BPF_ALU32_IMM(BPF_XOR, BPF_REG_1, 3),
BPF_JMP32_IMM(BPF_JNE, BPF_REG_1, 0, 1),
BPF_LDX_MEM(BPF_DW, BPF_REG_0, BPF_REG_0, 8),
BPF_MOV64_IMM(BPF_REG_0, 0),
BPF_EXIT_INSN(),
},
.fixup_map_hash_8b = { 3 },
.result = REJECT,
.errstr = "invalid access to map value",
.errstr_unpriv = "invalid access to map value",
},
{
"bounds check for reg > 0, reg xor 3",
.insns = {
BPF_ST_MEM(BPF_DW, BPF_REG_10, -8, 0),
BPF_MOV64_REG(BPF_REG_2, BPF_REG_10),
BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, -8),
BPF_LD_MAP_FD(BPF_REG_1, 0),
BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_map_lookup_elem),
BPF_JMP_IMM(BPF_JNE, BPF_REG_0, 0, 1),
BPF_EXIT_INSN(),
BPF_LDX_MEM(BPF_DW, BPF_REG_1, BPF_REG_0, 0),
BPF_JMP_IMM(BPF_JLE, BPF_REG_1, 0, 3),
BPF_ALU64_IMM(BPF_XOR, BPF_REG_1, 3),
BPF_JMP_IMM(BPF_JGE, BPF_REG_1, 0, 1),
BPF_LDX_MEM(BPF_DW, BPF_REG_0, BPF_REG_0, 8),
BPF_MOV64_IMM(BPF_REG_0, 0),
BPF_EXIT_INSN(),
},
.errstr_unpriv = "R0 min value is outside of the allowed memory range",
.result_unpriv = REJECT,
.fixup_map_hash_8b = { 3 },
.result = ACCEPT,
},
{
"bounds check for reg32 > 0, reg32 xor 3",
.insns = {
BPF_ST_MEM(BPF_DW, BPF_REG_10, -8, 0),
BPF_MOV64_REG(BPF_REG_2, BPF_REG_10),
BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, -8),
BPF_LD_MAP_FD(BPF_REG_1, 0),
BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_map_lookup_elem),
BPF_JMP_IMM(BPF_JNE, BPF_REG_0, 0, 1),
BPF_EXIT_INSN(),
BPF_LDX_MEM(BPF_DW, BPF_REG_1, BPF_REG_0, 0),
BPF_JMP32_IMM(BPF_JLE, BPF_REG_1, 0, 3),
BPF_ALU32_IMM(BPF_XOR, BPF_REG_1, 3),
BPF_JMP32_IMM(BPF_JGE, BPF_REG_1, 0, 1),
BPF_LDX_MEM(BPF_DW, BPF_REG_0, BPF_REG_0, 8),
BPF_MOV64_IMM(BPF_REG_0, 0),
BPF_EXIT_INSN(),
},
.errstr_unpriv = "R0 min value is outside of the allowed memory range",
.result_unpriv = REJECT,
.fixup_map_hash_8b = { 3 },
.result = ACCEPT,
},
{
"bounds checks after 32-bit truncation. test 1",
.insns = {
BPF_ST_MEM(BPF_DW, BPF_REG_10, -8, 0),
BPF_MOV64_REG(BPF_REG_2, BPF_REG_10),
BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, -8),
BPF_LD_MAP_FD(BPF_REG_1, 0),
BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_map_lookup_elem),
BPF_JMP_IMM(BPF_JEQ, BPF_REG_0, 0, 4),
BPF_LDX_MEM(BPF_W, BPF_REG_1, BPF_REG_0, 0),
/* This used to reduce the max bound to 0x7fffffff */
BPF_JMP_IMM(BPF_JEQ, BPF_REG_1, 0, 1),
BPF_JMP_IMM(BPF_JGT, BPF_REG_1, 0x7fffffff, 1),
BPF_MOV64_IMM(BPF_REG_0, 0),
BPF_EXIT_INSN(),
},
.fixup_map_hash_8b = { 3 },
.errstr_unpriv = "R0 leaks addr",
.result_unpriv = REJECT,
.result = ACCEPT,
},
{
"bounds checks after 32-bit truncation. test 2",
.insns = {
BPF_ST_MEM(BPF_DW, BPF_REG_10, -8, 0),
BPF_MOV64_REG(BPF_REG_2, BPF_REG_10),
BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, -8),
BPF_LD_MAP_FD(BPF_REG_1, 0),
BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_map_lookup_elem),
BPF_JMP_IMM(BPF_JEQ, BPF_REG_0, 0, 4),
BPF_LDX_MEM(BPF_W, BPF_REG_1, BPF_REG_0, 0),
BPF_JMP_IMM(BPF_JSLT, BPF_REG_1, 1, 1),
BPF_JMP32_IMM(BPF_JSLT, BPF_REG_1, 0, 1),
BPF_MOV64_IMM(BPF_REG_0, 0),
BPF_EXIT_INSN(),
},
.fixup_map_hash_8b = { 3 },
.errstr_unpriv = "R0 leaks addr",
.result_unpriv = REJECT,
.result = ACCEPT,
},
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