1 /* $NetBSD: t_exhaust.c,v 1.9 2019/03/16 21:57:15 christos Exp $ */
2
3 /*-
4 * Copyright (c) 2011 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by Christos Zoulas.
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 * 3. All advertising materials mentioning features or use of this software
19 * must display the following acknowledgement:
20 * This product includes software developed by the NetBSD
21 * Foundation, Inc. and its contributors.
22 * 4. Neither the name of The NetBSD Foundation nor the names of its
23 * contributors may be used to endorse or promote products derived
24 * from this software without specific prior written permission.
25 *
26 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
27 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
28 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
29 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
30 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
31 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
32 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
33 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
34 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
35 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
36 * POSSIBILITY OF SUCH DAMAGE.
37 */
38
39 #include <sys/cdefs.h>
40 __RCSID("$NetBSD: t_exhaust.c,v 1.9 2019/03/16 21:57:15 christos Exp $");
41
42 #include <sys/resource.h>
43 #include <atf-c.h>
44 #include <err.h>
45 #include <regex.h>
46 #include <stdio.h>
47 #include <stdlib.h>
48 #include <string.h>
49
50 #ifndef REGEX_MAXSIZE
51 #define REGEX_MAXSIZE 9999
52 #endif
53
54 static char *
mkstr(const char * str,size_t len)55 mkstr(const char *str, size_t len)
56 {
57 size_t slen = strlen(str);
58 char *p = malloc(slen * len + 1);
59 ATF_REQUIRE_MSG(p != NULL, "slen=%zu, len=%zu", slen, len);
60 for (size_t i = 0; i < len; i++)
61 strcpy(&p[i * slen], str);
62 return p;
63 }
64
65 static char *
concat(const char * d,const char * s)66 concat(const char *d, const char *s)
67 {
68 size_t dlen = strlen(d);
69 size_t slen = strlen(s);
70 char *p = malloc(dlen + slen + 1);
71
72 ATF_REQUIRE(p != NULL);
73 strcpy(p, d);
74 strcpy(p + dlen, s);
75 return p;
76 }
77
78 static char *
p0(size_t len)79 p0(size_t len)
80 {
81 char *d, *s1, *s2;
82 s1 = mkstr("\\(", len);
83 s2 = concat(s1, ")");
84 free(s1);
85 d = concat("(", s2);
86 free(s2);
87 return d;
88 }
89
90 static char *
p1(size_t len)91 p1(size_t len)
92 {
93 char *d, *s1, *s2, *s3;
94 s1 = mkstr("\\(", 60);
95 s2 = mkstr("(.*)", len);
96 s3 = concat(s1, s2);
97 free(s2);
98 free(s1);
99 s1 = concat(s3, ")");
100 free(s3);
101 d = concat("(", s1);
102 free(s1);
103 return d;
104 }
105
106 static char *
ps(const char * m,const char * s,size_t len)107 ps(const char *m, const char *s, size_t len)
108 {
109 char *d, *s1, *s2, *s3;
110 s1 = mkstr(m, len);
111 s2 = mkstr(s, len);
112 s3 = concat(s1, s2);
113 free(s2);
114 free(s1);
115 d = concat("(.?)", s3);
116 free(s3);
117 return d;
118 }
119
120 static char *
p2(size_t len)121 p2(size_t len)
122 {
123 return ps("((.*){0,255}", ")", len);
124 }
125
126 static char *
p3(size_t len)127 p3(size_t len)
128 {
129 return ps("(.\\{0,}", ")", len);
130 }
131
132 static char *
p4(size_t len)133 p4(size_t len)
134 {
135 return ps("((.*){1,255}", ")", len);
136 }
137
138 static char *
p5(size_t len)139 p5(size_t len)
140 {
141 return ps("(", "){1,100}", len);
142 }
143
144 static char *
p6(size_t len)145 p6(size_t len)
146 {
147 char *d, *s1, *s2;
148 s1 = mkstr("(?:(.*)|", len);
149 s2 = concat(s1, "(.*)");
150 free(s1);
151 s1 = mkstr(")", len);
152 d = concat(s2, s1);
153 free(s1);
154 free(s2);
155 return d;
156 }
157
158 static const struct {
159 char *(*pattern)(size_t);
160 int type;
161 } tests[] = {
162 { p0, REG_EXTENDED },
163 { p1, REG_EXTENDED },
164 { p2, REG_EXTENDED },
165 { p3, REG_EXTENDED },
166 { p4, REG_EXTENDED },
167 { p5, REG_EXTENDED },
168 { p6, REG_BASIC },
169 };
170
171 ATF_TC(regcomp_too_big);
172
ATF_TC_HEAD(regcomp_too_big,tc)173 ATF_TC_HEAD(regcomp_too_big, tc)
174 {
175
176 atf_tc_set_md_var(tc, "descr", "Check that large patterns don't"
177 " crash, but return a proper error code");
178 // libtre needs it.
179 atf_tc_set_md_var(tc, "timeout", "600");
180 atf_tc_set_md_var(tc, "require.memory", "64M");
181 }
182
ATF_TC_BODY(regcomp_too_big,tc)183 ATF_TC_BODY(regcomp_too_big, tc)
184 {
185 regex_t re;
186 int e;
187 struct rlimit limit;
188
189 #if defined(__i386__)
190 if (atf_tc_get_config_var_as_bool_wd(tc, "ci", false))
191 atf_tc_skip("https://bugs.freebsd.org/237450");
192 #endif
193
194 limit.rlim_cur = limit.rlim_max = 256 * 1024 * 1024;
195 ATF_REQUIRE(setrlimit(RLIMIT_VMEM, &limit) != -1);
196
197 for (size_t i = 0; i < __arraycount(tests); i++) {
198 char *d = (*tests[i].pattern)(REGEX_MAXSIZE);
199 e = regcomp(&re, d, tests[i].type);
200 if (e) {
201 char ebuf[1024];
202 (void)regerror(e, &re, ebuf, sizeof(ebuf));
203 ATF_REQUIRE_MSG(e == REG_ESPACE,
204 "regcomp returned %d (%s) for pattern %zu [%s]", e, ebuf,
205 i, d);
206 free(d);
207 continue;
208 }
209 free(d);
210 (void)regexec(&re, "aaaaaaaaaaa", 0, NULL, 0);
211 regfree(&re);
212 }
213 }
214
ATF_TP_ADD_TCS(tp)215 ATF_TP_ADD_TCS(tp)
216 {
217
218 ATF_TP_ADD_TC(tp, regcomp_too_big);
219 return atf_no_error();
220 }
221