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bpf: add upper complexity limit to verifier log

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Given the limit could potentially get further adjustments in the
future, add it to the log so it becomes obvious what the current
limit is w/o having to check the source first. This may also be
helpful for debugging complexity related issues on kernels that
backport from upstream.

Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Daniel Borkmann 2018-01-20 01:24:36 +01:00 committed by Alexei Starovoitov
parent de0a444dda
commit 4bd95f4b99
1 changed files with 2 additions and 1 deletions
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3
kernel/bpf/verifier.c
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@ -4810,7 +4810,8 @@ process_bpf_exit:
insn_idx++;
}
verbose(env, "processed %d insns, stack depth ", insn_processed);
verbose(env, "processed %d insns (limit %d), stack depth ",
insn_processed, BPF_COMPLEXITY_LIMIT_INSNS);
for (i = 0; i < env->subprog_cnt + 1; i++) {
u32 depth = env->subprog_stack_depth[i];