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bpf: add upper complexity limit to verifier log 

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];