static bool caller_may_see_dir(pid_t pid, const char *contrl, const char *cg)
{
	bool answer = false;
	char *c2, *task_cg;
	size_t target_len, task_len;

	if (strcmp(cg, "/") == 0)
		return true;

	c2 = get_pid_cgroup(pid, contrl);

	if (!c2)
		return false;

	task_cg = c2 + 1;
	target_len = strlen(cg);
	task_len = strlen(task_cg);
	if (strcmp(cg, task_cg) == 0) {
		answer = true;
		goto out;
	}
	if (target_len < task_len) {
		/* looking up a parent dir */
		if (strncmp(task_cg, cg, target_len) == 0 && task_cg[target_len] == '/')
			answer = true;
		goto out;
	}
	if (target_len > task_len) {
		/* looking up a child dir */
		if (strncmp(task_cg, cg, task_len) == 0 && cg[task_len] == '/')
			answer = true;
		goto out;
	}

out:
	free(c2);
	return answer;
}

This category addresses vulnerabilities caused by flawed access control mechanisms, where incorrect permission settings allow unauthorized users to access restricted resources.