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bpf: track immediate values written to stack by BPF_ST instruction

Browse source 
For aligned stack writes using BPF_ST instruction track stored values
in a same way BPF_STX is handled, e.g. make sure that the following
commands produce similar verifier knowledge:

  fp[-8] = 42;             r1 = 42;
                       fp[-8] = r1;

This covers two cases:
 - non-null values written to stack are stored as spill of fake
   registers;
 - null values written to stack are stored as STACK_ZERO marks.

Previously both cases above used STACK_MISC marks instead.

Some verifier test cases relied on the old logic to obtain STACK_MISC
marks for some stack values. These test cases are updated in the same
commit to avoid failures during bisect.

Signed-off-by: Eduard Zingerman <eddyz87@gmail.com>
Link: https://lore.kernel.org/r/20230214232030.1502829-2-eddyz87@gmail.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Eduard Zingerman 2023-02-15 01:20:27 +02:00 committed by Alexei Starovoitov
parent 62d101d5f4
commit ecdf985d76
2 changed files with 80 additions and 48 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

18
kernel/bpf/verifier.c
View file

@ -3473,6 +3473,11 @@ static void save_register_state(struct bpf_func_state *state,
scrub_spilled_slot(&state->stack[spi].slot_type[i - 1]);
}
static bool is_bpf_st_mem(struct bpf_insn *insn)
{
return BPF_CLASS(insn->code) == BPF_ST && BPF_MODE(insn->code) == BPF_MEM;
}
/* check_stack_{read,write}_fixed_off functions track spill/fill of registers,
* stack boundary and alignment are checked in check_mem_access()
*/
@ -3484,8 +3489,9 @@ static int check_stack_write_fixed_off(struct bpf_verifier_env *env,
{
struct bpf_func_state *cur; /* state of the current function */
int i, slot = -off - 1, spi = slot / BPF_REG_SIZE, err;
u32 dst_reg = env->prog->insnsi[insn_idx].dst_reg;
struct bpf_insn *insn = &env->prog->insnsi[insn_idx];
struct bpf_reg_state *reg = NULL;
u32 dst_reg = insn->dst_reg;
err = grow_stack_state(state, round_up(slot + 1, BPF_REG_SIZE));
if (err)
@ -3538,6 +3544,13 @@ static int check_stack_write_fixed_off(struct bpf_verifier_env *env,
return err;
}
save_register_state(state, spi, reg, size);
} else if (!reg && !(off % BPF_REG_SIZE) && is_bpf_st_mem(insn) &&
insn->imm != 0 && env->bpf_capable) {
struct bpf_reg_state fake_reg = {};
__mark_reg_known(&fake_reg, (u32)insn->imm);
fake_reg.type = SCALAR_VALUE;
save_register_state(state, spi, &fake_reg, size);
} else if (reg && is_spillable_regtype(reg->type)) {
/* register containing pointer is being spilled into stack */
if (size != BPF_REG_SIZE) {
@ -3572,7 +3585,8 @@ static int check_stack_write_fixed_off(struct bpf_verifier_env *env,
state->stack[spi].spilled_ptr.live |= REG_LIVE_WRITTEN;
/* when we zero initialize stack slots mark them as such */
if (reg && register_is_null(reg)) {
if ((reg && register_is_null(reg)) ||
(!reg && is_bpf_st_mem(insn) && insn->imm == 0)) {
/* backtracking doesn't work for STACK_ZERO yet. */
err = mark_chain_precision(env, value_regno);
if (err)

110
tools/testing/selftests/bpf/verifier/bounds_mix_sign_unsign.c
View file

@ -1,13 +1,14 @@
{
"bounds checks mixing signed and unsigned, positive bounds",
.insns = {
BPF_EMIT_CALL(BPF_FUNC_ktime_get_ns),
BPF_STX_MEM(BPF_DW, BPF_REG_10, BPF_REG_0, -16),
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, 7),
BPF_ST_MEM(BPF_DW, BPF_REG_10, -16, -8),
BPF_JMP_IMM(BPF_JEQ, BPF_REG_0, 0, 6),
BPF_LDX_MEM(BPF_DW, BPF_REG_1, BPF_REG_10, -16),
BPF_MOV64_IMM(BPF_REG_2, 2),
BPF_JMP_REG(BPF_JGE, BPF_REG_2, BPF_REG_1, 3),
@ -17,20 +18,21 @@
BPF_MOV64_IMM(BPF_REG_0, 0),
BPF_EXIT_INSN(),
},
.fixup_map_hash_8b = { 3 },
.fixup_map_hash_8b = { 5 },
.errstr = "unbounded min value",
.result = REJECT,
},
{
"bounds checks mixing signed and unsigned",
.insns = {
BPF_EMIT_CALL(BPF_FUNC_ktime_get_ns),
BPF_STX_MEM(BPF_DW, BPF_REG_10, BPF_REG_0, -16),
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, 7),
BPF_ST_MEM(BPF_DW, BPF_REG_10, -16, -8),
BPF_JMP_IMM(BPF_JEQ, BPF_REG_0, 0, 6),
BPF_LDX_MEM(BPF_DW, BPF_REG_1, BPF_REG_10, -16),
BPF_MOV64_IMM(BPF_REG_2, -1),
BPF_JMP_REG(BPF_JGT, BPF_REG_1, BPF_REG_2, 3),
@ -40,20 +42,21 @@
BPF_MOV64_IMM(BPF_REG_0, 0),
BPF_EXIT_INSN(),
},
.fixup_map_hash_8b = { 3 },
.fixup_map_hash_8b = { 5 },
.errstr = "unbounded min value",
.result = REJECT,
},
{
"bounds checks mixing signed and unsigned, variant 2",
.insns = {
BPF_EMIT_CALL(BPF_FUNC_ktime_get_ns),
BPF_STX_MEM(BPF_DW, BPF_REG_10, BPF_REG_0, -16),
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_ST_MEM(BPF_DW, BPF_REG_10, -16, -8),
BPF_JMP_IMM(BPF_JEQ, BPF_REG_0, 0, 8),
BPF_LDX_MEM(BPF_DW, BPF_REG_1, BPF_REG_10, -16),
BPF_MOV64_IMM(BPF_REG_2, -1),
BPF_JMP_REG(BPF_JGT, BPF_REG_1, BPF_REG_2, 5),
@ -65,20 +68,21 @@
BPF_MOV64_IMM(BPF_REG_0, 0),
BPF_EXIT_INSN(),
},
.fixup_map_hash_8b = { 3 },
.fixup_map_hash_8b = { 5 },
.errstr = "unbounded min value",
.result = REJECT,
},
{
"bounds checks mixing signed and unsigned, variant 3",
.insns = {
BPF_EMIT_CALL(BPF_FUNC_ktime_get_ns),
BPF_STX_MEM(BPF_DW, BPF_REG_10, BPF_REG_0, -16),
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_ST_MEM(BPF_DW, BPF_REG_10, -16, -8),
BPF_JMP_IMM(BPF_JEQ, BPF_REG_0, 0, 7),
BPF_LDX_MEM(BPF_DW, BPF_REG_1, BPF_REG_10, -16),
BPF_MOV64_IMM(BPF_REG_2, -1),
BPF_JMP_REG(BPF_JGT, BPF_REG_1, BPF_REG_2, 4),
@ -89,20 +93,21 @@
BPF_MOV64_IMM(BPF_REG_0, 0),
BPF_EXIT_INSN(),
},
.fixup_map_hash_8b = { 3 },
.fixup_map_hash_8b = { 5 },
.errstr = "unbounded min value",
.result = REJECT,
},
{
"bounds checks mixing signed and unsigned, variant 4",
.insns = {
BPF_EMIT_CALL(BPF_FUNC_ktime_get_ns),
BPF_STX_MEM(BPF_DW, BPF_REG_10, BPF_REG_0, -16),
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, 7),
BPF_ST_MEM(BPF_DW, BPF_REG_10, -16, -8),
BPF_JMP_IMM(BPF_JEQ, BPF_REG_0, 0, 6),
BPF_LDX_MEM(BPF_DW, BPF_REG_1, BPF_REG_10, -16),
BPF_MOV64_IMM(BPF_REG_2, 1),
BPF_ALU64_REG(BPF_AND, BPF_REG_1, BPF_REG_2),
@ -112,19 +117,20 @@
BPF_MOV64_IMM(BPF_REG_0, 0),
BPF_EXIT_INSN(),
},
.fixup_map_hash_8b = { 3 },
.fixup_map_hash_8b = { 5 },
.result = ACCEPT,
},
{
"bounds checks mixing signed and unsigned, variant 5",
.insns = {
BPF_EMIT_CALL(BPF_FUNC_ktime_get_ns),
BPF_STX_MEM(BPF_DW, BPF_REG_10, BPF_REG_0, -16),
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_ST_MEM(BPF_DW, BPF_REG_10, -16, -8),
BPF_JMP_IMM(BPF_JEQ, BPF_REG_0, 0, 8),
BPF_LDX_MEM(BPF_DW, BPF_REG_1, BPF_REG_10, -16),
BPF_MOV64_IMM(BPF_REG_2, -1),
BPF_JMP_REG(BPF_JGT, BPF_REG_1, BPF_REG_2, 5),
@ -135,17 +141,20 @@
BPF_MOV64_IMM(BPF_REG_0, 0),
BPF_EXIT_INSN(),
},
.fixup_map_hash_8b = { 3 },
.fixup_map_hash_8b = { 5 },
.errstr = "unbounded min value",
.result = REJECT,
},
{
"bounds checks mixing signed and unsigned, variant 6",
.insns = {
BPF_MOV64_REG(BPF_REG_9, BPF_REG_1),
BPF_EMIT_CALL(BPF_FUNC_ktime_get_ns),
BPF_STX_MEM(BPF_DW, BPF_REG_10, BPF_REG_0, -16),
BPF_MOV64_REG(BPF_REG_1, BPF_REG_9),
BPF_MOV64_IMM(BPF_REG_2, 0),
BPF_MOV64_REG(BPF_REG_3, BPF_REG_10),
BPF_ALU64_IMM(BPF_ADD, BPF_REG_3, -512),
BPF_ST_MEM(BPF_DW, BPF_REG_10, -16, -8),
BPF_LDX_MEM(BPF_DW, BPF_REG_4, BPF_REG_10, -16),
BPF_MOV64_IMM(BPF_REG_6, -1),
BPF_JMP_REG(BPF_JGT, BPF_REG_4, BPF_REG_6, 5),
@ -163,13 +172,14 @@
{
"bounds checks mixing signed and unsigned, variant 7",
.insns = {
BPF_EMIT_CALL(BPF_FUNC_ktime_get_ns),
BPF_STX_MEM(BPF_DW, BPF_REG_10, BPF_REG_0, -16),
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, 7),
BPF_ST_MEM(BPF_DW, BPF_REG_10, -16, -8),
BPF_JMP_IMM(BPF_JEQ, BPF_REG_0, 0, 6),
BPF_LDX_MEM(BPF_DW, BPF_REG_1, BPF_REG_10, -16),
BPF_MOV64_IMM(BPF_REG_2, 1024 * 1024 * 1024),
BPF_JMP_REG(BPF_JGT, BPF_REG_1, BPF_REG_2, 3),
@ -179,19 +189,20 @@
BPF_MOV64_IMM(BPF_REG_0, 0),
BPF_EXIT_INSN(),
},
.fixup_map_hash_8b = { 3 },
.fixup_map_hash_8b = { 5 },
.result = ACCEPT,
},
{
"bounds checks mixing signed and unsigned, variant 8",
.insns = {
BPF_EMIT_CALL(BPF_FUNC_ktime_get_ns),
BPF_STX_MEM(BPF_DW, BPF_REG_10, BPF_REG_0, -16),
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_ST_MEM(BPF_DW, BPF_REG_10, -16, -8),
BPF_JMP_IMM(BPF_JEQ, BPF_REG_0, 0, 8),
BPF_LDX_MEM(BPF_DW, BPF_REG_1, BPF_REG_10, -16),
BPF_MOV64_IMM(BPF_REG_2, -1),
BPF_JMP_REG(BPF_JGT, BPF_REG_2, BPF_REG_1, 2),
@ -203,20 +214,21 @@
BPF_MOV64_IMM(BPF_REG_0, 0),
BPF_EXIT_INSN(),
},
.fixup_map_hash_8b = { 3 },
.fixup_map_hash_8b = { 5 },
.errstr = "unbounded min value",
.result = REJECT,
},
{
"bounds checks mixing signed and unsigned, variant 9",
.insns = {
BPF_EMIT_CALL(BPF_FUNC_ktime_get_ns),
BPF_STX_MEM(BPF_DW, BPF_REG_10, BPF_REG_0, -16),
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, 10),
BPF_ST_MEM(BPF_DW, BPF_REG_10, -16, -8),
BPF_JMP_IMM(BPF_JEQ, BPF_REG_0, 0, 9),
BPF_LDX_MEM(BPF_DW, BPF_REG_1, BPF_REG_10, -16),
BPF_LD_IMM64(BPF_REG_2, -9223372036854775808ULL),
BPF_JMP_REG(BPF_JGT, BPF_REG_2, BPF_REG_1, 2),
@ -228,19 +240,20 @@
BPF_MOV64_IMM(BPF_REG_0, 0),
BPF_EXIT_INSN(),
},
.fixup_map_hash_8b = { 3 },
.fixup_map_hash_8b = { 5 },
.result = ACCEPT,
},
{
"bounds checks mixing signed and unsigned, variant 10",
.insns = {
BPF_EMIT_CALL(BPF_FUNC_ktime_get_ns),
BPF_STX_MEM(BPF_DW, BPF_REG_10, BPF_REG_0, -16),
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_ST_MEM(BPF_DW, BPF_REG_10, -16, -8),
BPF_JMP_IMM(BPF_JEQ, BPF_REG_0, 0, 8),
BPF_LDX_MEM(BPF_DW, BPF_REG_1, BPF_REG_10, -16),
BPF_MOV64_IMM(BPF_REG_2, 0),
BPF_JMP_REG(BPF_JGT, BPF_REG_2, BPF_REG_1, 2),
@ -252,20 +265,21 @@
BPF_MOV64_IMM(BPF_REG_0, 0),
BPF_EXIT_INSN(),
},
.fixup_map_hash_8b = { 3 },
.fixup_map_hash_8b = { 5 },
.errstr = "unbounded min value",
.result = REJECT,
},
{
"bounds checks mixing signed and unsigned, variant 11",
.insns = {
BPF_EMIT_CALL(BPF_FUNC_ktime_get_ns),
BPF_STX_MEM(BPF_DW, BPF_REG_10, BPF_REG_0, -16),
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_ST_MEM(BPF_DW, BPF_REG_10, -16, -8),
BPF_JMP_IMM(BPF_JEQ, BPF_REG_0, 0, 8),
BPF_LDX_MEM(BPF_DW, BPF_REG_1, BPF_REG_10, -16),
BPF_MOV64_IMM(BPF_REG_2, -1),
BPF_JMP_REG(BPF_JGE, BPF_REG_2, BPF_REG_1, 2),
@ -278,20 +292,21 @@
BPF_MOV64_IMM(BPF_REG_0, 0),
BPF_EXIT_INSN(),
},
.fixup_map_hash_8b = { 3 },
.fixup_map_hash_8b = { 5 },
.errstr = "unbounded min value",
.result = REJECT,
},
{
"bounds checks mixing signed and unsigned, variant 12",
.insns = {
BPF_EMIT_CALL(BPF_FUNC_ktime_get_ns),
BPF_STX_MEM(BPF_DW, BPF_REG_10, BPF_REG_0, -16),
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_ST_MEM(BPF_DW, BPF_REG_10, -16, -8),
BPF_JMP_IMM(BPF_JEQ, BPF_REG_0, 0, 8),
BPF_LDX_MEM(BPF_DW, BPF_REG_1, BPF_REG_10, -16),
BPF_MOV64_IMM(BPF_REG_2, -6),
BPF_JMP_REG(BPF_JGE, BPF_REG_2, BPF_REG_1, 2),
@ -303,20 +318,21 @@
BPF_MOV64_IMM(BPF_REG_0, 0),
BPF_EXIT_INSN(),
},
.fixup_map_hash_8b = { 3 },
.fixup_map_hash_8b = { 5 },
.errstr = "unbounded min value",
.result = REJECT,
},
{
"bounds checks mixing signed and unsigned, variant 13",
.insns = {
BPF_EMIT_CALL(BPF_FUNC_ktime_get_ns),
BPF_STX_MEM(BPF_DW, BPF_REG_10, BPF_REG_0, -16),
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_ST_MEM(BPF_DW, BPF_REG_10, -16, -8),
BPF_JMP_IMM(BPF_JEQ, BPF_REG_0, 0, 5),
BPF_LDX_MEM(BPF_DW, BPF_REG_1, BPF_REG_10, -16),
BPF_MOV64_IMM(BPF_REG_2, 2),
BPF_JMP_REG(BPF_JGE, BPF_REG_2, BPF_REG_1, 2),
@ -331,7 +347,7 @@
BPF_MOV64_IMM(BPF_REG_0, 0),
BPF_EXIT_INSN(),
},
.fixup_map_hash_8b = { 3 },
.fixup_map_hash_8b = { 5 },
.errstr = "unbounded min value",
.result = REJECT,
},
@ -340,13 +356,14 @@
.insns = {
BPF_LDX_MEM(BPF_W, BPF_REG_9, BPF_REG_1,
offsetof(struct __sk_buff, mark)),
BPF_EMIT_CALL(BPF_FUNC_ktime_get_ns),
BPF_STX_MEM(BPF_DW, BPF_REG_10, BPF_REG_0, -16),
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_ST_MEM(BPF_DW, BPF_REG_10, -16, -8),
BPF_JMP_IMM(BPF_JEQ, BPF_REG_0, 0, 7),
BPF_LDX_MEM(BPF_DW, BPF_REG_1, BPF_REG_10, -16),
BPF_MOV64_IMM(BPF_REG_2, -1),
BPF_MOV64_IMM(BPF_REG_8, 2),
@ -360,20 +377,21 @@
BPF_JMP_REG(BPF_JGT, BPF_REG_1, BPF_REG_2, -3),
BPF_JMP_IMM(BPF_JA, 0, 0, -7),
},
.fixup_map_hash_8b = { 4 },
.fixup_map_hash_8b = { 6 },
.errstr = "unbounded min value",
.result = REJECT,
},
{
"bounds checks mixing signed and unsigned, variant 15",
.insns = {
BPF_EMIT_CALL(BPF_FUNC_ktime_get_ns),
BPF_STX_MEM(BPF_DW, BPF_REG_10, BPF_REG_0, -16),
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_ST_MEM(BPF_DW, BPF_REG_10, -16, -8),
BPF_JMP_IMM(BPF_JEQ, BPF_REG_0, 0, 3),
BPF_LDX_MEM(BPF_DW, BPF_REG_1, BPF_REG_10, -16),
BPF_MOV64_IMM(BPF_REG_2, -6),
BPF_JMP_REG(BPF_JGE, BPF_REG_2, BPF_REG_1, 2),
@ -387,7 +405,7 @@
BPF_MOV64_IMM(BPF_REG_0, 0),
BPF_EXIT_INSN(),
},
.fixup_map_hash_8b = { 3 },
.fixup_map_hash_8b = { 5 },
.errstr = "unbounded min value",
.result = REJECT,
},