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 42 ATF_TC(random_same); 43 ATF_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 52 ATF_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 76 ATF_TP_ADD_TCS(tp) 77 { 78 79 ATF_TP_ADD_TC(tp, random_same); 80 81 return atf_no_error(); 82 } 83