bpf: Add bpf_verifier_vlog() and bpf_verifier_log_needed()
The BTF (BPF Type Format) verifier needs to reuse the current BPF verifier log. Hence, it requires the following changes: (1) Expose log_write() in verifier.c for other users. Its name is renamed to bpf_verifier_vlog(). (2) The BTF verifier also needs to check 'log->level && log->ubuf && !bpf_verifier_log_full(log);' independently outside of the current log_write(). It is because the BTF verifier will do one-check before making multiple calls to btf_verifier_vlog to log the details of a type. Hence, this check is also re-factored to a new function bpf_verifier_log_needed(). Since it is re-factored, we can check it before va_start() in the current bpf_verifier_log_write() and verbose(). Signed-off-by: NMartin KaFai Lau <kafai@fb.com> Acked-by: NAlexei Starovoitov <ast@fb.com> Signed-off-by: NDaniel Borkmann <daniel@iogearbox.net>
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