static int check_btf_info(struct bpf_verifier_env *env,
			  const union bpf_attr *attr,
			  bpfptr_t uattr)
{
	struct btf *btf;
	int err;

	if (!attr->func_info_cnt && !attr->line_info_cnt) {
		if (check_abnormal_return(env))
			return -EINVAL;
		return 0;
	}

	btf = btf_get_by_fd(attr->prog_btf_fd);
	if (IS_ERR(btf))
		return PTR_ERR(btf);
	if (btf_is_kernel(btf)) {
		btf_put(btf);
		return -EACCES;
	}
	env->prog->aux->btf = btf;

	err = check_btf_func(env, attr, uattr);
	if (err)
		return err;

	err = check_btf_line(env, attr, uattr);
	if (err)
		return err;

	return 0;
}
Unknown