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Diffstat (limited to 'kernel/bpf/verifier.c')
-rw-r--r--kernel/bpf/verifier.c38
1 files changed, 20 insertions, 18 deletions
diff --git a/kernel/bpf/verifier.c b/kernel/bpf/verifier.c
index 785d25392ead..1cffd4e84725 100644
--- a/kernel/bpf/verifier.c
+++ b/kernel/bpf/verifier.c
@@ -6918,7 +6918,7 @@ static int is_branch32_taken(struct bpf_reg_state *reg, u32 val, u8 opcode)
case BPF_JSGT:
if (reg->s32_min_value > sval)
return 1;
- else if (reg->s32_max_value < sval)
+ else if (reg->s32_max_value <= sval)
return 0;
break;
case BPF_JLT:
@@ -6991,7 +6991,7 @@ static int is_branch64_taken(struct bpf_reg_state *reg, u64 val, u8 opcode)
case BPF_JSGT:
if (reg->smin_value > sval)
return 1;
- else if (reg->smax_value < sval)
+ else if (reg->smax_value <= sval)
return 0;
break;
case BPF_JLT:
@@ -8631,7 +8631,11 @@ static bool range_within(struct bpf_reg_state *old,
return old->umin_value <= cur->umin_value &&
old->umax_value >= cur->umax_value &&
old->smin_value <= cur->smin_value &&
- old->smax_value >= cur->smax_value;
+ old->smax_value >= cur->smax_value &&
+ old->u32_min_value <= cur->u32_min_value &&
+ old->u32_max_value >= cur->u32_max_value &&
+ old->s32_min_value <= cur->s32_min_value &&
+ old->s32_max_value >= cur->s32_max_value;
}
/* Maximum number of register states that can exist at once */
@@ -11117,30 +11121,28 @@ static int fixup_bpf_calls(struct bpf_verifier_env *env)
insn->code == (BPF_ALU | BPF_MOD | BPF_X) ||
insn->code == (BPF_ALU | BPF_DIV | BPF_X)) {
bool is64 = BPF_CLASS(insn->code) == BPF_ALU64;
- struct bpf_insn mask_and_div[] = {
- BPF_MOV32_REG(insn->src_reg, insn->src_reg),
+ bool isdiv = BPF_OP(insn->code) == BPF_DIV;
+ struct bpf_insn *patchlet;
+ struct bpf_insn chk_and_div[] = {
/* Rx div 0 -> 0 */
- BPF_JMP_IMM(BPF_JNE, insn->src_reg, 0, 2),
+ BPF_RAW_INSN((is64 ? BPF_JMP : BPF_JMP32) |
+ BPF_JNE | BPF_K, insn->src_reg,
+ 0, 2, 0),
BPF_ALU32_REG(BPF_XOR, insn->dst_reg, insn->dst_reg),
BPF_JMP_IMM(BPF_JA, 0, 0, 1),
*insn,
};
- struct bpf_insn mask_and_mod[] = {
- BPF_MOV32_REG(insn->src_reg, insn->src_reg),
+ struct bpf_insn chk_and_mod[] = {
/* Rx mod 0 -> Rx */
- BPF_JMP_IMM(BPF_JEQ, insn->src_reg, 0, 1),
+ BPF_RAW_INSN((is64 ? BPF_JMP : BPF_JMP32) |
+ BPF_JEQ | BPF_K, insn->src_reg,
+ 0, 1, 0),
*insn,
};
- struct bpf_insn *patchlet;
- if (insn->code == (BPF_ALU64 | BPF_DIV | BPF_X) ||
- insn->code == (BPF_ALU | BPF_DIV | BPF_X)) {
- patchlet = mask_and_div + (is64 ? 1 : 0);
- cnt = ARRAY_SIZE(mask_and_div) - (is64 ? 1 : 0);
- } else {
- patchlet = mask_and_mod + (is64 ? 1 : 0);
- cnt = ARRAY_SIZE(mask_and_mod) - (is64 ? 1 : 0);
- }
+ patchlet = isdiv ? chk_and_div : chk_and_mod;
+ cnt = isdiv ? ARRAY_SIZE(chk_and_div) :
+ ARRAY_SIZE(chk_and_mod);
new_prog = bpf_patch_insn_data(env, i + delta, patchlet, cnt);
if (!new_prog)