diff options
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/bpf/core.c | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/kernel/bpf/core.c b/kernel/bpf/core.c index 8191a7db2777..66088a9e9b9e 100644 --- a/kernel/bpf/core.c +++ b/kernel/bpf/core.c @@ -890,7 +890,8 @@ int bpf_jit_get_func_addr(const struct bpf_prog *prog, static int bpf_jit_blind_insn(const struct bpf_insn *from, const struct bpf_insn *aux, - struct bpf_insn *to_buff) + struct bpf_insn *to_buff, + bool emit_zext) { struct bpf_insn *to = to_buff; u32 imm_rnd = get_random_int(); @@ -1005,6 +1006,8 @@ static int bpf_jit_blind_insn(const struct bpf_insn *from, case 0: /* Part 2 of BPF_LD | BPF_IMM | BPF_DW. */ *to++ = BPF_ALU32_IMM(BPF_MOV, BPF_REG_AX, imm_rnd ^ aux[0].imm); *to++ = BPF_ALU32_IMM(BPF_XOR, BPF_REG_AX, imm_rnd); + if (emit_zext) + *to++ = BPF_ZEXT_REG(BPF_REG_AX); *to++ = BPF_ALU64_REG(BPF_OR, aux[0].dst_reg, BPF_REG_AX); break; @@ -1088,7 +1091,8 @@ struct bpf_prog *bpf_jit_blind_constants(struct bpf_prog *prog) insn[1].code == 0) memcpy(aux, insn, sizeof(aux)); - rewritten = bpf_jit_blind_insn(insn, aux, insn_buff); + rewritten = bpf_jit_blind_insn(insn, aux, insn_buff, + clone->aux->verifier_zext); if (!rewritten) continue; |