1/* $NetBSD: t_random.c,v 1.3 2012/03/29 08:56:06 jruoho Exp $ */
2
3/*-
4 * Copyright (c) 2012 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by Jukka Ruohonen.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 *    notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 *    notice, this list of conditions and the following disclaimer in the
17 *    documentation and/or other materials provided with the distribution.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29 * POSSIBILITY OF SUCH DAMAGE.
30 */
31#include <sys/cdefs.h>
32__RCSID("$NetBSD: t_random.c,v 1.3 2012/03/29 08:56:06 jruoho Exp $");
33
34#include <atf-c.h>
35#include <stdio.h>
36#include <stdlib.h>
37
38/*
39 * TODO: Add some general RNG tests (cf. the famous "diehard" tests?).
40 */
41
42ATF_TC(random_same);
43ATF_TC_HEAD(random_same, tc)
44{
45	atf_tc_set_md_var(tc, "descr",
46	    "Test that random(3) does not always return the same "
47	    "value when the seed is initialized to zero");
48}
49
50#define MAX_ITER 10
51
52ATF_TC_BODY(random_same, tc)
53{
54	long buf[MAX_ITER];
55	size_t i, j;
56
57	/*
58	 * See CVE-2012-1577.
59	 */
60	srandom(0);
61
62	for (i = 0; i < __arraycount(buf); i++) {
63
64		buf[i] = random();
65
66		for (j = 0; j < i; j++) {
67
68			(void)fprintf(stderr, "i = %zu, j = %zu: "
69			    "%ld vs. %ld\n", i, j, buf[i], buf[j]);
70
71			ATF_CHECK(buf[i] != buf[j]);
72		}
73	}
74}
75
76ATF_TP_ADD_TCS(tp)
77{
78
79	ATF_TP_ADD_TC(tp, random_same);
80
81	return atf_no_error();
82}
83