1 /* $NetBSD: t_dup.c,v 1.9 2017/01/13 20:31:53 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 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_dup.c,v 1.9 2017/01/13 20:31:53 christos Exp $");
33
34 #include <sys/resource.h>
35 #include <sys/stat.h>
36 #include <sys/wait.h>
37
38 #include <atf-c.h>
39 #include <errno.h>
40 #include <fcntl.h>
41 #include <limits.h>
42 #include <stdbool.h>
43 #include <stdio.h>
44 #include <stdlib.h>
45 #include <string.h>
46 #include <unistd.h>
47 #include <sysexits.h>
48
49 static char path[] = "dup";
50 static void check_mode(bool, bool, bool);
51
52 static void
check_mode(bool _dup,bool _dup2,bool _dup3)53 check_mode(bool _dup, bool _dup2, bool _dup3)
54 {
55 int mode[3] = { O_RDONLY, O_WRONLY, O_RDWR };
56 int perm[5] = { 0700, 0400, 0600, 0444, 0666 };
57 struct stat st, st1;
58 int fd, fd1, fd2;
59 size_t i, j;
60
61 /*
62 * Check that a duplicated descriptor
63 * retains the mode of the original file.
64 */
65 for (i = 0; i < __arraycount(mode); i++) {
66
67 for (j = 0; j < __arraycount(perm); j++) {
68
69 fd1 = open(path, mode[i] | O_CREAT, perm[j]);
70 fd2 = open("/etc/passwd", O_RDONLY);
71
72 ATF_REQUIRE(fd1 >= 0);
73 ATF_REQUIRE(fd2 >= 0);
74
75 if (_dup != false)
76 fd = dup(fd1);
77 else if (_dup2 != false)
78 fd = dup2(fd1, fd2);
79 else if (_dup3 != false)
80 fd = dup3(fd1, fd2, O_CLOEXEC);
81 else {
82 fd = -1;
83 }
84
85 ATF_REQUIRE(fd >= 0);
86
87 (void)memset(&st, 0, sizeof(struct stat));
88 (void)memset(&st1, 0, sizeof(struct stat));
89
90 ATF_REQUIRE(fstat(fd, &st) == 0);
91 ATF_REQUIRE(fstat(fd1, &st1) == 0);
92
93 if (st.st_mode != st1.st_mode)
94 atf_tc_fail("invalid mode");
95
96 (void)close(fd);
97 (void)close(fd1);
98 (void)close(fd2);
99 (void)unlink(path);
100 }
101 }
102 }
103
104 ATF_TC(dup2_basic);
ATF_TC_HEAD(dup2_basic,tc)105 ATF_TC_HEAD(dup2_basic, tc)
106 {
107 atf_tc_set_md_var(tc, "descr", "A basic test of dup2(2)");
108 }
109
ATF_TC_BODY(dup2_basic,tc)110 ATF_TC_BODY(dup2_basic, tc)
111 {
112 int fd, fd1, fd2;
113
114 fd1 = open("/etc/passwd", O_RDONLY);
115 fd2 = open("/etc/passwd", O_RDONLY);
116
117 ATF_REQUIRE(fd1 >= 0);
118 ATF_REQUIRE(fd2 >= 0);
119
120 fd = dup2(fd1, fd2);
121 ATF_REQUIRE(fd >= 0);
122
123 if (fd != fd2)
124 atf_tc_fail("invalid descriptor");
125
126 (void)close(fd);
127 (void)close(fd1);
128
129 ATF_REQUIRE(close(fd2) != 0);
130 }
131
132 ATF_TC(dup2_err);
ATF_TC_HEAD(dup2_err,tc)133 ATF_TC_HEAD(dup2_err, tc)
134 {
135 atf_tc_set_md_var(tc, "descr", "Test error conditions of dup2(2)");
136 }
137
ATF_TC_BODY(dup2_err,tc)138 ATF_TC_BODY(dup2_err, tc)
139 {
140 int fd;
141
142 fd = open("/etc/passwd", O_RDONLY);
143 ATF_REQUIRE(fd >= 0);
144
145 errno = 0;
146 ATF_REQUIRE_ERRNO(EBADF, dup2(-1, -1) == -1);
147
148 errno = 0;
149 ATF_REQUIRE_ERRNO(EBADF, dup2(fd, -1) == -1);
150
151 errno = 0;
152 ATF_REQUIRE_ERRNO(EBADF, dup2(-1, fd) == -1);
153
154 /*
155 * Note that this should not fail with EINVAL.
156 */
157 ATF_REQUIRE(dup2(fd, fd) != -1);
158
159 (void)close(fd);
160 }
161
162 ATF_TC(dup2_max);
ATF_TC_HEAD(dup2_max,tc)163 ATF_TC_HEAD(dup2_max, tc)
164 {
165 atf_tc_set_md_var(tc, "descr", "Test dup2(2) against limits");
166 }
167
ATF_TC_BODY(dup2_max,tc)168 ATF_TC_BODY(dup2_max, tc)
169 {
170 struct rlimit res;
171
172 (void)memset(&res, 0, sizeof(struct rlimit));
173 (void)getrlimit(RLIMIT_NOFILE, &res);
174
175 errno = 0;
176 ATF_REQUIRE_ERRNO(EBADF, dup2(STDERR_FILENO, res.rlim_cur + 1) == -1);
177 }
178
179 ATF_TC_WITH_CLEANUP(dup2_mode);
ATF_TC_HEAD(dup2_mode,tc)180 ATF_TC_HEAD(dup2_mode, tc)
181 {
182 atf_tc_set_md_var(tc, "descr", "A basic test of dup2(2)");
183 }
184
ATF_TC_BODY(dup2_mode,tc)185 ATF_TC_BODY(dup2_mode, tc)
186 {
187 check_mode(false, true, false);
188 }
189
ATF_TC_CLEANUP(dup2_mode,tc)190 ATF_TC_CLEANUP(dup2_mode, tc)
191 {
192 (void)unlink(path);
193 }
194
195
196 ATF_TC(dup3_err);
ATF_TC_HEAD(dup3_err,tc)197 ATF_TC_HEAD(dup3_err, tc)
198 {
199 atf_tc_set_md_var(tc, "descr",
200 "Test error conditions of dup3(2) (PR lib/45148)");
201 }
202
ATF_TC_BODY(dup3_err,tc)203 ATF_TC_BODY(dup3_err, tc)
204 {
205 int fd;
206
207 fd = open("/etc/passwd", O_RDONLY);
208 ATF_REQUIRE(fd >= 0);
209
210 errno = 0;
211 ATF_REQUIRE(dup3(fd, fd, O_CLOEXEC) != -1);
212
213 errno = 0;
214 ATF_REQUIRE_ERRNO(EBADF, dup3(-1, -1, O_CLOEXEC) == -1);
215
216 errno = 0;
217 ATF_REQUIRE_ERRNO(EBADF, dup3(fd, -1, O_CLOEXEC) == -1);
218
219 errno = 0;
220 ATF_REQUIRE_ERRNO(EBADF, dup3(-1, fd, O_CLOEXEC) == -1);
221
222 errno = 0;
223 ATF_REQUIRE_ERRNO(EINVAL, dup3(fd, 1, O_NOFOLLOW) == -1);
224
225 (void)close(fd);
226 }
227
228 ATF_TC(dup3_max);
ATF_TC_HEAD(dup3_max,tc)229 ATF_TC_HEAD(dup3_max, tc)
230 {
231 atf_tc_set_md_var(tc, "descr", "Test dup3(2) against limits");
232 }
233
ATF_TC_BODY(dup3_max,tc)234 ATF_TC_BODY(dup3_max, tc)
235 {
236 struct rlimit res;
237
238 (void)memset(&res, 0, sizeof(struct rlimit));
239 (void)getrlimit(RLIMIT_NOFILE, &res);
240
241 errno = 0;
242 ATF_REQUIRE_ERRNO(EBADF, dup3(STDERR_FILENO,
243 res.rlim_cur + 1, O_CLOEXEC) == -1);
244 }
245
246 ATF_TC_WITH_CLEANUP(dup3_mode);
ATF_TC_HEAD(dup3_mode,tc)247 ATF_TC_HEAD(dup3_mode, tc)
248 {
249 atf_tc_set_md_var(tc, "descr", "A basic test of dup3(2)");
250 }
251
ATF_TC_BODY(dup3_mode,tc)252 ATF_TC_BODY(dup3_mode, tc)
253 {
254 check_mode(false, false, true);
255 }
256
ATF_TC_CLEANUP(dup3_mode,tc)257 ATF_TC_CLEANUP(dup3_mode, tc)
258 {
259 (void)unlink(path);
260 }
261
262 ATF_TC(dup_err);
ATF_TC_HEAD(dup_err,tc)263 ATF_TC_HEAD(dup_err, tc)
264 {
265 atf_tc_set_md_var(tc, "descr", "Test error conditions of dup(2)");
266 }
267
ATF_TC_BODY(dup_err,tc)268 ATF_TC_BODY(dup_err, tc)
269 {
270
271 errno = 0;
272 ATF_REQUIRE_ERRNO(EBADF, dup(-1) == -1);
273 }
274
275 ATF_TC_WITH_CLEANUP(dup_max);
ATF_TC_HEAD(dup_max,tc)276 ATF_TC_HEAD(dup_max, tc)
277 {
278 atf_tc_set_md_var(tc, "descr", "Test dup(2) against limits");
279 }
280
ATF_TC_BODY(dup_max,tc)281 ATF_TC_BODY(dup_max, tc)
282 {
283 struct rlimit res;
284 int *buf, fd, sta;
285 size_t i, n;
286 pid_t pid;
287
288 pid = fork();
289 ATF_REQUIRE(pid >= 0);
290
291 if (pid == 0) {
292
293 /*
294 * Open a temporary file until the
295 * maximum number of open files is
296 * reached. Ater that dup(2) family
297 * should fail with EMFILE.
298 */
299 (void)closefrom(0);
300 (void)memset(&res, 0, sizeof(struct rlimit));
301
302 n = 10;
303 res.rlim_cur = res.rlim_max = n;
304 if (setrlimit(RLIMIT_NOFILE, &res) != 0)
305 _exit(EX_OSERR);
306
307 buf = calloc(n, sizeof(int));
308
309 if (buf == NULL)
310 _exit(EX_OSERR);
311
312 buf[0] = mkstemp(path);
313
314 if (buf[0] < 0)
315 _exit(EX_OSERR);
316
317 for (i = 1; i < n; i++) {
318
319 buf[i] = open(path, O_RDONLY);
320
321 if (buf[i] < 0)
322 _exit(EX_OSERR);
323 }
324
325 errno = 0;
326 fd = dup(buf[0]);
327
328 if (fd != -1 || errno != EMFILE)
329 _exit(EX_DATAERR);
330
331 _exit(EXIT_SUCCESS);
332 }
333
334 (void)wait(&sta);
335
336 if (WIFEXITED(sta) == 0 || WEXITSTATUS(sta) != EXIT_SUCCESS) {
337
338 if (WEXITSTATUS(sta) == EX_OSERR)
339 atf_tc_fail("system call error");
340
341 if (WEXITSTATUS(sta) == EX_DATAERR)
342 atf_tc_fail("dup(2) dupped more than RLIMIT_NOFILE");
343
344 atf_tc_fail("unknown error");
345 }
346
347 (void)unlink(path);
348 }
349
ATF_TC_CLEANUP(dup_max,tc)350 ATF_TC_CLEANUP(dup_max, tc)
351 {
352 (void)unlink(path);
353 }
354
355 ATF_TC_WITH_CLEANUP(dup_mode);
ATF_TC_HEAD(dup_mode,tc)356 ATF_TC_HEAD(dup_mode, tc)
357 {
358 atf_tc_set_md_var(tc, "descr", "A basic test of dup(2)");
359 }
360
ATF_TC_BODY(dup_mode,tc)361 ATF_TC_BODY(dup_mode, tc)
362 {
363 check_mode(true, false, false);
364 }
365
ATF_TC_CLEANUP(dup_mode,tc)366 ATF_TC_CLEANUP(dup_mode, tc)
367 {
368 (void)unlink(path);
369 }
370
ATF_TP_ADD_TCS(tp)371 ATF_TP_ADD_TCS(tp)
372 {
373
374 ATF_TP_ADD_TC(tp, dup2_basic);
375 ATF_TP_ADD_TC(tp, dup2_err);
376 ATF_TP_ADD_TC(tp, dup2_max);
377 ATF_TP_ADD_TC(tp, dup2_mode);
378 ATF_TP_ADD_TC(tp, dup3_err);
379 ATF_TP_ADD_TC(tp, dup3_max);
380 ATF_TP_ADD_TC(tp, dup3_mode);
381 ATF_TP_ADD_TC(tp, dup_err);
382 ATF_TP_ADD_TC(tp, dup_max);
383 ATF_TP_ADD_TC(tp, dup_mode);
384
385 return atf_no_error();
386 }
387