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bpf: Do per-instruction state dumping in verifier when log_level > 1.

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If log_level > 1, do a state dump every instruction and emit it in
a more compact way (without a leading newline).

This will facilitate more sophisticated test cases which inspect the
verifier log for register state.

Signed-off-by: David S. Miller <davem@davemloft.net>
Acked-by: Daniel Borkmann <daniel@iogearbox.net>
This commit is contained in:
David S. Miller 2017-05-10 11:25:17 -07:00
parent d117441674
commit c5fc9692d1
1 changed files with 6 additions and 2 deletions
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8
kernel/bpf/verifier.c
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@ -2926,8 +2926,12 @@ static int do_check(struct bpf_verifier_env *env)
goto process_bpf_exit;
}
if (log_level && do_print_state) {
verbose("\nfrom %d to %d:", prev_insn_idx, insn_idx);
if (log_level > 1 || (log_level && do_print_state)) {
if (log_level > 1)
verbose("%d:", insn_idx);
else
verbose("\nfrom %d to %d:",
prev_insn_idx, insn_idx);
print_verifier_state(&env->cur_state);
do_print_state = false;
}