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bpf: Allow empty module BTFs 

Some modules don't declare any new types and end up with an empty BTF,
containing only valid BTF header and no types or strings sections. This
currently causes BTF validation error. There is nothing wrong with such BTF,
so fix the issue by allowing module BTFs with no types or strings.

Fixes: 36e68442d1 ("bpf: Load and verify kernel module BTFs")
Reported-by: Christopher William Snowhill <chris@kode54.net>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Yonghong Song <yhs@fb.com>
Link: https://lore.kernel.org/bpf/20210110070341.1380086-1-andrii@kernel.org
master
Andrii Nakryiko 2021-01-09 23:03:40 -08:00 committed by Daniel Borkmann
parent 4be34f3d07
commit bcc5e6162d
1 changed files with 1 additions and 1 deletions
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2
kernel/bpf/btf.c
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@ -4172,7 +4172,7 @@ static int btf_parse_hdr(struct btf_verifier_env *env)
return -ENOTSUPP;
}
if (btf_data_size == hdr->hdr_len) {
if (!btf->base_btf && btf_data_size == hdr->hdr_len) {
btf_verifier_log(env, "No data");
return -EINVAL;
}