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| author | David S. Miller <davem@davemloft.net> | 2017-09-28 10:23:19 -0700 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2017-09-28 10:23:19 -0700 |
| commit | 93771b01600506d3c22d0802f9d0500325b13a69 (patch) | |
| tree | b728e14e460b2a53546bdb27e39507714b7701fa | |
| parent | 4d8806fd14e1492cd4fb2021f709b163ea3364ad (diff) | |
| parent | 73c864b38383f4abc9b559025cd663f4a81afa89 (diff) | |
| download | linux-93771b01600506d3c22d0802f9d0500325b13a69.tar.gz linux-93771b01600506d3c22d0802f9d0500325b13a69.tar.bz2 linux-93771b01600506d3c22d0802f9d0500325b13a69.zip | |
Merge branch 'bpf-verifier-disassembly-improvements'
Edward Cree says:
====================
bpf/verifier: disassembly improvements
Fix the output of print_bpf_insn() for ALU ops that don't look like
compound assignment (i.e. BPF_END and BPF_NEG).
Sample output for a short test program:
0: (b4) (u32) r0 = (u32) 0
1: (dc) r0 = be32 r0
2: (84) r0 = (u32) -r0
3: (95) exit
processed 4 insns, stack depth 0
====================
Signed-off-by: David S. Miller <davem@davemloft.net>
| -rw-r--r-- | kernel/bpf/verifier.c | 23 |
1 files changed, 21 insertions, 2 deletions
diff --git a/kernel/bpf/verifier.c b/kernel/bpf/verifier.c index f849eca36052..4cf9b72c59a0 100644 --- a/kernel/bpf/verifier.c +++ b/kernel/bpf/verifier.c @@ -332,26 +332,45 @@ static const char *const bpf_jmp_string[16] = { [BPF_EXIT >> 4] = "exit", }; +static void print_bpf_end_insn(const struct bpf_verifier_env *env, + const struct bpf_insn *insn) +{ + verbose("(%02x) r%d = %s%d r%d\n", insn->code, insn->dst_reg, + BPF_SRC(insn->code) == BPF_TO_BE ? "be" : "le", + insn->imm, insn->dst_reg); +} + static void print_bpf_insn(const struct bpf_verifier_env *env, const struct bpf_insn *insn) { u8 class = BPF_CLASS(insn->code); if (class == BPF_ALU || class == BPF_ALU64) { - if (BPF_SRC(insn->code) == BPF_X) + if (BPF_OP(insn->code) == BPF_END) { + if (class == BPF_ALU64) + verbose("BUG_alu64_%02x\n", insn->code); + else + print_bpf_end_insn(env, insn); + } else if (BPF_OP(insn->code) == BPF_NEG) { + verbose("(%02x) r%d = %s-r%d\n", + insn->code, insn->dst_reg, + class == BPF_ALU ? "(u32) " : "", + insn->dst_reg); + } else if (BPF_SRC(insn->code) == BPF_X) { verbose("(%02x) %sr%d %s %sr%d\n", insn->code, class == BPF_ALU ? "(u32) " : "", insn->dst_reg, bpf_alu_string[BPF_OP(insn->code) >> 4], class == BPF_ALU ? "(u32) " : "", insn->src_reg); - else + } else { verbose("(%02x) %sr%d %s %s%d\n", insn->code, class == BPF_ALU ? "(u32) " : "", insn->dst_reg, bpf_alu_string[BPF_OP(insn->code) >> 4], class == BPF_ALU ? "(u32) " : "", insn->imm); + } } else if (class == BPF_STX) { if (BPF_MODE(insn->code) == BPF_MEM) verbose("(%02x) *(%s *)(r%d %+d) = r%d\n", |