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1/* tzset tests with crafted time zone data.
2 Copyright (C) 2015-2019 Free Software Foundation, Inc.
3
4 The GNU C Library is free software; you can redistribute it and/or
5 modify it under the terms of the GNU Lesser General Public
6 License as published by the Free Software Foundation; either
7 version 2.1 of the License, or (at your option) any later version.
8
9 The GNU C Library is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 Lesser General Public License for more details.
13
14 You should have received a copy of the GNU Lesser General Public
15 License along with the GNU C Library; if not, see
16 <http://www.gnu.org/licenses/>. */
17
18#define _GNU_SOURCE 1
19
20#include <errno.h>
21#include <stdio.h>
22#include <stdlib.h>
23#include <string.h>
24#include <sys/resource.h>
25#include <time.h>
26#include <unistd.h>
27#include <support/check.h>
28
29static int do_test (void);
30#define TEST_FUNCTION do_test ()
31#include "../test-skeleton.c"
32
33/* Returns the name of a large TZ file. */
34static char *
35create_tz_file (off64_t size)
36{
37 char *path;
38 int fd = create_temp_file ("tst-tzset-", &path);
39 if (fd < 0)
40 exit (1);
41 if (!support_descriptor_supports_holes (fd))
42 FAIL_UNSUPPORTED ("File %s does not support holes", path);
43
44 // Reopen for large-file support.
45 close (fd);
46 fd = open64 (path, O_WRONLY);
47 if (fd < 0)
48 {
49 printf ("open64 (%s) failed: %m\n", path);
50 exit (1);
51 }
52
53 static const char data[] = {
54 0x54, 0x5a, 0x69, 0x66, 0x32, 0x00, 0x00, 0x00,
55 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
56 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01,
57 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0x00,
58 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01,
59 0x00, 0x00, 0x00, 0x04, 0x00, 0x00, 0x00, 0x00,
60 0x00, 0x00, 0x58, 0x54, 0x47, 0x00, 0x00, 0x00,
61 0x54, 0x5a, 0x69, 0x66, 0x32, 0x00, 0x00, 0x00,
62 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
63 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01,
64 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0x00,
65 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0x01,
66 0x00, 0x00, 0x00, 0x04, 0xf8, 0x00, 0x00, 0x00,
67 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
68 0x00, 0x00, 0x00, 0x58, 0x54, 0x47, 0x00, 0x00,
69 0x00, 0x0a, 0x58, 0x54, 0x47, 0x30, 0x0a
70 };
71 ssize_t ret = write (fd, data, sizeof (data));
72 if (ret < 0)
73 {
74 printf ("write failed: %m\n");
75 exit (1);
76 }
77 if ((size_t) ret != sizeof (data))
78 {
79 printf ("Short write\n");
80 exit (1);
81 }
82 if (lseek64 (fd, size, SEEK_CUR) < 0)
83 {
84 printf ("lseek failed: %m\n");
85 close (fd);
86 return NULL;
87 }
88 if (write (fd, "", 1) != 1)
89 {
90 printf ("Single-byte write failed\n");
91 close (fd);
92 return NULL;
93 }
94 if (close (fd) != 0)
95 {
96 printf ("close failed: %m\n");
97 exit (1);
98 }
99 return path;
100}
101
102static void
103test_tz_file (off64_t size)
104{
105 char *path = create_tz_file (size);
106 if (setenv ("TZ", path, 1) < 0)
107 {
108 printf ("setenv failed: %m\n");
109 exit (1);
110 }
111 tzset ();
112 free (path);
113}
114
115static int
116do_test (void)
117{
118 /* Limit the size of the process. Otherwise, some of the tests will
119 consume a lot of resources. */
120 {
121 struct rlimit limit;
122 if (getrlimit (RLIMIT_AS, &limit) != 0)
123 {
124 printf ("getrlimit (RLIMIT_AS) failed: %m\n");
125 return 1;
126 }
127 long target = 512 * 1024 * 1024;
128 if (limit.rlim_cur == RLIM_INFINITY || limit.rlim_cur > target)
129 {
130 limit.rlim_cur = 512 * 1024 * 1024;
131 if (setrlimit (RLIMIT_AS, &limit) != 0)
132 {
133 printf ("setrlimit (RLIMIT_AS) failed: %m\n");
134 return 1;
135 }
136 }
137 }
138
139 int errors = 0;
140 for (int i = 1; i <= 4; ++i)
141 {
142 char tz[16];
143 snprintf (tz, sizeof (tz), "XT%d", i);
144 if (setenv ("TZ", tz, 1) < 0)
145 {
146 printf ("setenv failed: %m\n");
147 return 1;
148 }
149 tzset ();
150 if (strcmp (tzname[0], tz) == 0)
151 {
152 printf ("Unexpected success for %s\n", tz);
153 ++errors;
154 }
155 }
156
157 /* Large TZ files. */
158
159 /* This will succeed on 64-bit architectures, and fail on 32-bit
160 architectures. It used to crash on 32-bit. */
161 test_tz_file (64 * 1024 * 1024);
162
163 /* This will fail on 64-bit and 32-bit architectures. It used to
164 cause a test timeout on 64-bit and crash on 32-bit if the TZ file
165 open succeeded for some reason (it does not use O_LARGEFILE in
166 regular builds). */
167 test_tz_file (4LL * 1024 * 1024 * 1024 - 6);
168
169 /* Large TZ variables. */
170 {
171 size_t length = 64 * 1024 * 1024;
172 char *value = malloc (length + 1);
173 if (value == NULL)
174 {
175 puts ("malloc failed: %m");
176 return 1;
177 }
178 value[length] = '\0';
179
180 memset (value, ' ', length);
181 value[0] = 'U';
182 value[1] = 'T';
183 value[2] = 'C';
184 if (setenv ("TZ", value, 1) < 0)
185 {
186 printf ("setenv failed: %m\n");
187 return 1;
188 }
189 tzset ();
190
191 memset (value, '0', length);
192 value[0] = '<';
193 value[length - 1] = '>';
194 if (setenv ("TZ", value, 1) < 0)
195 {
196 printf ("setenv failed: %m\n");
197 return 1;
198 }
199 tzset ();
200 }
201
202 return errors > 0;
203}
204

Warning: That file was not part of the compilation database. It may have many parsing errors.