t_random.c revision 1.2 
1/* $NetBSD: t_random.c,v 1.2 2012/03/28 10:38:00 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 1.2 2012/03/28 10:38:00 jruoho Exp $");
33
34#include <atf-c.h>
35#include <stdlib.h>
36
37/*
38 * TODO: Add some general RNG tests (cf. the famous "diehard" tests?).
39 */
40
41ATF_TC(random_zero);
42ATF_TC_HEAD(random_zero, tc)
43{
44	atf_tc_set_md_var(tc, "descr",
45	    "Test that random(3) does not always return "
46	    "zero when the seed is initialized to zero");
47}
48
49ATF_TC_BODY(random_zero, tc)
50{
51	const size_t n = 1000000;
52	size_t i, j;
53	long x;
54
55	/*
56	 * See CVE-2012-1577.
57	 */
58	srandom(0);
59
60	for (i = j = 0; i < n; i++) {
61
62		if ((x = random()) == 0)
63			j++;
64	}
65
66	ATF_REQUIRE(j != n);
67}
68
69ATF_TP_ADD_TCS(tp)
70{
71
72	ATF_TP_ADD_TC(tp, random_zero);
73
74	return atf_no_error();
75}
76