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bpf: btf: Ensure t->type == 0 for BTF_KIND_FWD

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The t->type in BTF_KIND_FWD is not used.  It must be 0.
This patch ensures that and also adds a test case in test_btf.c

Signed-off-by: Martin KaFai Lau <kafai@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: Cyber Knight <cyberknight755@gmail.com>
This commit is contained in:
Martin KaFai Lau 2018-06-02 09:06:51 -07:00 committed by Richard Raya
parent 7c91077981
commit c77bbc8ea6
1 changed files with 20 additions and 1 deletions
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21
kernel/bpf/btf.c
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@ -1240,8 +1240,27 @@ static struct btf_kind_operations ptr_ops = {
.seq_show = btf_ptr_seq_show,
};
static s32 btf_fwd_check_meta(struct btf_verifier_env *env,
const struct btf_type *t,
u32 meta_left)
{
if (btf_type_vlen(t)) {
btf_verifier_log_type(env, t, "vlen != 0");
return -EINVAL;
}
if (t->type) {
btf_verifier_log_type(env, t, "type != 0");
return -EINVAL;
}
btf_verifier_log_type(env, t, NULL);
return 0;
}
static struct btf_kind_operations fwd_ops = {
.check_meta = btf_ref_type_check_meta,
.check_meta = btf_fwd_check_meta,
.resolve = btf_df_resolve,
.check_member = btf_df_check_member,
.log_details = btf_ref_type_log,