From c5a2d43e998a821701029f23e25b62f9188e93ff Mon Sep 17 00:00:00 2001 From: Alexei Starovoitov Date: Wed, 1 Dec 2021 10:10:29 -0800 Subject: [PATCH] bpf: Adjust BTF log size limit. Make BTF log size limit to be the same as the verifier log size limit. Otherwise tools that progressively increase log size and use the same log for BTF loading and program loading will be hitting hard to debug EINVAL. Signed-off-by: Alexei Starovoitov Signed-off-by: Andrii Nakryiko Link: https://lore.kernel.org/bpf/20211201181040.23337-7-alexei.starovoitov@gmail.com --- kernel/bpf/btf.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/kernel/bpf/btf.c b/kernel/bpf/btf.c index 0d07046..dbf1f38 100644 --- a/kernel/bpf/btf.c +++ b/kernel/bpf/btf.c @@ -4472,7 +4472,7 @@ static struct btf *btf_parse(bpfptr_t btf_data, u32 btf_data_size, log->len_total = log_size; /* log attributes have to be sane */ - if (log->len_total < 128 || log->len_total > UINT_MAX >> 8 || + if (log->len_total < 128 || log->len_total > UINT_MAX >> 2 || !log->level || !log->ubuf) { err = -EINVAL; goto errout; -- 2.7.4