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bpf: fix BTF verification of enums

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vmlinux BTF has enums that are 8 byte and 1 byte in size.
2 byte enum is a valid construct as well.
Fix BTF enum verification to accept those sizes.

Fixes: 69b693f0ae ("bpf: btf: Introduce BPF Type Format (BTF)")
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Martin KaFai Lau <kafai@fb.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
This commit is contained in:
Alexei Starovoitov 2019-09-17 10:45:37 -07:00 committed by Daniel Borkmann
parent e0973a421c
commit 9eea984979
1 changed files with 2 additions and 3 deletions
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kernel/bpf/btf.c
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@ -2377,9 +2377,8 @@ static s32 btf_enum_check_meta(struct btf_verifier_env *env,
return -EINVAL;
}
if (t->size != sizeof(int)) {
btf_verifier_log_type(env, t, "Expected size:%zu",
sizeof(int));
if (t->size > 8 || !is_power_of_2(t->size)) {
btf_verifier_log_type(env, t, "Unexpected size");
return -EINVAL;
}