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 #ifdef __NetBSD__
51 static void check_mode(bool, bool, bool);
52 #endif
53
54 static void
check_mode(bool _dup,bool _dup2,bool _dup3)55 check_mode(bool _dup, bool _dup2, bool _dup3)
56 {
57 int mode[3] = { O_RDONLY, O_WRONLY, O_RDWR };
58 int perm[5] = { 0700, 0400, 0600, 0444, 0666 };
59 struct stat st, st1;
60 int fd, fd1, fd2;
61 size_t i, j;
62
63 /*
64 * Check that a duplicated descriptor
65 * retains the mode of the original file.
66 */
67 for (i = 0; i < __arraycount(mode); i++) {
68
69 for (j = 0; j < __arraycount(perm); j++) {
70
71 fd1 = open(path, mode[i] | O_CREAT, perm[j]);
72 fd2 = open("/etc/passwd", O_RDONLY);
73
74 ATF_REQUIRE(fd1 >= 0);
75 ATF_REQUIRE(fd2 >= 0);
76
77 if (_dup != false)
78 fd = dup(fd1);
79 else if (_dup2 != false)
80 fd = dup2(fd1, fd2);
81 else if (_dup3 != false)
82 fd = dup3(fd1, fd2, O_CLOEXEC);
83 else {
84 fd = -1;
85 }
86
87 ATF_REQUIRE(fd >= 0);
88
89 (void)memset(&st, 0, sizeof(struct stat));
90 (void)memset(&st1, 0, sizeof(struct stat));
91
92 ATF_REQUIRE(fstat(fd, &st) == 0);
93 ATF_REQUIRE(fstat(fd1, &st1) == 0);
94
95 if (st.st_mode != st1.st_mode)
96 atf_tc_fail("invalid mode");
97
98 (void)close(fd);
99 (void)close(fd1);
100 (void)close(fd2);
101 (void)unlink(path);
102 }
103 }
104 }
105
106 ATF_TC(dup2_basic);
ATF_TC_HEAD(dup2_basic,tc)107 ATF_TC_HEAD(dup2_basic, tc)
108 {
109 atf_tc_set_md_var(tc, "descr", "A basic test of dup2(2)");
110 }
111
ATF_TC_BODY(dup2_basic,tc)112 ATF_TC_BODY(dup2_basic, tc)
113 {
114 int fd, fd1, fd2;
115
116 fd1 = open("/etc/passwd", O_RDONLY);
117 fd2 = open("/etc/passwd", O_RDONLY);
118
119 ATF_REQUIRE(fd1 >= 0);
120 ATF_REQUIRE(fd2 >= 0);
121
122 fd = dup2(fd1, fd2);
123 ATF_REQUIRE(fd >= 0);
124
125 if (fd != fd2)
126 atf_tc_fail("invalid descriptor");
127
128 (void)close(fd);
129 (void)close(fd1);
130
131 ATF_REQUIRE(close(fd2) != 0);
132 }
133
134 ATF_TC(dup2_err);
ATF_TC_HEAD(dup2_err,tc)135 ATF_TC_HEAD(dup2_err, tc)
136 {
137 atf_tc_set_md_var(tc, "descr", "Test error conditions of dup2(2)");
138 }
139
ATF_TC_BODY(dup2_err,tc)140 ATF_TC_BODY(dup2_err, tc)
141 {
142 int fd;
143
144 fd = open("/etc/passwd", O_RDONLY);
145 ATF_REQUIRE(fd >= 0);
146
147 errno = 0;
148 ATF_REQUIRE_ERRNO(EBADF, dup2(-1, -1) == -1);
149
150 errno = 0;
151 ATF_REQUIRE_ERRNO(EBADF, dup2(fd, -1) == -1);
152
153 errno = 0;
154 ATF_REQUIRE_ERRNO(EBADF, dup2(-1, fd) == -1);
155
156 /*
157 * Note that this should not fail with EINVAL.
158 */
159 ATF_REQUIRE(dup2(fd, fd) != -1);
160
161 (void)close(fd);
162 }
163
164 ATF_TC(dup2_max);
ATF_TC_HEAD(dup2_max,tc)165 ATF_TC_HEAD(dup2_max, tc)
166 {
167 atf_tc_set_md_var(tc, "descr", "Test dup2(2) against limits");
168 }
169
ATF_TC_BODY(dup2_max,tc)170 ATF_TC_BODY(dup2_max, tc)
171 {
172 struct rlimit res;
173
174 (void)memset(&res, 0, sizeof(struct rlimit));
175 (void)getrlimit(RLIMIT_NOFILE, &res);
176
177 errno = 0;
178 ATF_REQUIRE_ERRNO(EBADF, dup2(STDERR_FILENO, res.rlim_cur + 1) == -1);
179 }
180
181 ATF_TC_WITH_CLEANUP(dup2_mode);
ATF_TC_HEAD(dup2_mode,tc)182 ATF_TC_HEAD(dup2_mode, tc)
183 {
184 atf_tc_set_md_var(tc, "descr", "A basic test of dup2(2)");
185 }
186
ATF_TC_BODY(dup2_mode,tc)187 ATF_TC_BODY(dup2_mode, tc)
188 {
189 check_mode(false, true, false);
190 }
191
ATF_TC_CLEANUP(dup2_mode,tc)192 ATF_TC_CLEANUP(dup2_mode, tc)
193 {
194 (void)unlink(path);
195 }
196
197
198 ATF_TC(dup3_err);
ATF_TC_HEAD(dup3_err,tc)199 ATF_TC_HEAD(dup3_err, tc)
200 {
201 atf_tc_set_md_var(tc, "descr",
202 "Test error conditions of dup3(2) (PR lib/45148)");
203 }
204
ATF_TC_BODY(dup3_err,tc)205 ATF_TC_BODY(dup3_err, tc)
206 {
207 int fd;
208
209 fd = open("/etc/passwd", O_RDONLY);
210 ATF_REQUIRE(fd >= 0);
211
212 errno = 0;
213 #if defined(__FreeBSD__) || defined(__linux__)
214 /*
215 * FreeBSD and linux return EINVAL, because...
216 *
217 * [EINVAL] The oldd argument is equal to the newd argument.
218 */
219 ATF_REQUIRE(dup3(fd, fd, O_CLOEXEC) == -1);
220 #else
221 ATF_REQUIRE(dup3(fd, fd, O_CLOEXEC) != -1);
222 #endif
223
224 errno = 0;
225 #if defined(__FreeBSD__) || defined(__linux__)
226 ATF_REQUIRE_ERRNO(EINVAL, dup3(-1, -1, O_CLOEXEC) == -1);
227 ATF_REQUIRE_ERRNO(EBADF, dup3(fd, -1, O_CLOEXEC) == -1);
228 #else
229 ATF_REQUIRE_ERRNO(EBADF, dup3(-1, -1, O_CLOEXEC) == -1);
230 #endif
231
232 errno = 0;
233 ATF_REQUIRE_ERRNO(EBADF, dup3(fd, -1, O_CLOEXEC) == -1);
234
235 errno = 0;
236 ATF_REQUIRE_ERRNO(EBADF, dup3(-1, fd, O_CLOEXEC) == -1);
237
238 errno = 0;
239 ATF_REQUIRE_ERRNO(EINVAL, dup3(fd, 1, O_NOFOLLOW) == -1);
240
241 (void)close(fd);
242 }
243
244 ATF_TC(dup3_max);
ATF_TC_HEAD(dup3_max,tc)245 ATF_TC_HEAD(dup3_max, tc)
246 {
247 atf_tc_set_md_var(tc, "descr", "Test dup3(2) against limits");
248 }
249
ATF_TC_BODY(dup3_max,tc)250 ATF_TC_BODY(dup3_max, tc)
251 {
252 struct rlimit res;
253
254 (void)memset(&res, 0, sizeof(struct rlimit));
255 (void)getrlimit(RLIMIT_NOFILE, &res);
256
257 errno = 0;
258 ATF_REQUIRE_ERRNO(EBADF, dup3(STDERR_FILENO,
259 res.rlim_cur + 1, O_CLOEXEC) == -1);
260 }
261
262 ATF_TC_WITH_CLEANUP(dup3_mode);
ATF_TC_HEAD(dup3_mode,tc)263 ATF_TC_HEAD(dup3_mode, tc)
264 {
265 atf_tc_set_md_var(tc, "descr", "A basic test of dup3(2)");
266 }
267
ATF_TC_BODY(dup3_mode,tc)268 ATF_TC_BODY(dup3_mode, tc)
269 {
270 check_mode(false, false, true);
271 }
272
ATF_TC_CLEANUP(dup3_mode,tc)273 ATF_TC_CLEANUP(dup3_mode, tc)
274 {
275 (void)unlink(path);
276 }
277
278 ATF_TC(dup_err);
ATF_TC_HEAD(dup_err,tc)279 ATF_TC_HEAD(dup_err, tc)
280 {
281 atf_tc_set_md_var(tc, "descr", "Test error conditions of dup(2)");
282 }
283
ATF_TC_BODY(dup_err,tc)284 ATF_TC_BODY(dup_err, tc)
285 {
286
287 errno = 0;
288 ATF_REQUIRE_ERRNO(EBADF, dup(-1) == -1);
289 }
290
291 ATF_TC_WITH_CLEANUP(dup_max);
ATF_TC_HEAD(dup_max,tc)292 ATF_TC_HEAD(dup_max, tc)
293 {
294 atf_tc_set_md_var(tc, "descr", "Test dup(2) against limits");
295 }
296
ATF_TC_BODY(dup_max,tc)297 ATF_TC_BODY(dup_max, tc)
298 {
299 struct rlimit res;
300 int *buf, fd, sta;
301 size_t i, n;
302 pid_t pid;
303
304 pid = fork();
305 ATF_REQUIRE(pid >= 0);
306
307 if (pid == 0) {
308
309 /*
310 * Open a temporary file until the
311 * maximum number of open files is
312 * reached. Ater that dup(2) family
313 * should fail with EMFILE.
314 */
315 (void)closefrom(0);
316 (void)memset(&res, 0, sizeof(struct rlimit));
317
318 n = 10;
319 res.rlim_cur = res.rlim_max = n;
320 if (setrlimit(RLIMIT_NOFILE, &res) != 0)
321 _exit(EX_OSERR);
322
323 buf = calloc(n, sizeof(int));
324
325 if (buf == NULL)
326 _exit(EX_OSERR);
327
328 buf[0] = mkstemp(path);
329
330 if (buf[0] < 0)
331 _exit(EX_OSERR);
332
333 for (i = 1; i < n; i++) {
334
335 buf[i] = open(path, O_RDONLY);
336
337 if (buf[i] < 0)
338 _exit(EX_OSERR);
339 }
340
341 errno = 0;
342 fd = dup(buf[0]);
343
344 if (fd != -1 || errno != EMFILE)
345 _exit(EX_DATAERR);
346
347 _exit(EXIT_SUCCESS);
348 }
349
350 (void)wait(&sta);
351
352 if (WIFEXITED(sta) == 0 || WEXITSTATUS(sta) != EXIT_SUCCESS) {
353
354 if (WEXITSTATUS(sta) == EX_OSERR)
355 atf_tc_fail("system call error");
356
357 if (WEXITSTATUS(sta) == EX_DATAERR)
358 atf_tc_fail("dup(2) dupped more than RLIMIT_NOFILE");
359
360 atf_tc_fail("unknown error");
361 }
362
363 (void)unlink(path);
364 }
365
ATF_TC_CLEANUP(dup_max,tc)366 ATF_TC_CLEANUP(dup_max, tc)
367 {
368 (void)unlink(path);
369 }
370
371 ATF_TC_WITH_CLEANUP(dup_mode);
ATF_TC_HEAD(dup_mode,tc)372 ATF_TC_HEAD(dup_mode, tc)
373 {
374 atf_tc_set_md_var(tc, "descr", "A basic test of dup(2)");
375 }
376
ATF_TC_BODY(dup_mode,tc)377 ATF_TC_BODY(dup_mode, tc)
378 {
379 check_mode(true, false, false);
380 }
381
ATF_TC_CLEANUP(dup_mode,tc)382 ATF_TC_CLEANUP(dup_mode, tc)
383 {
384 (void)unlink(path);
385 }
386
ATF_TP_ADD_TCS(tp)387 ATF_TP_ADD_TCS(tp)
388 {
389
390 ATF_TP_ADD_TC(tp, dup2_basic);
391 ATF_TP_ADD_TC(tp, dup2_err);
392 ATF_TP_ADD_TC(tp, dup2_max);
393 ATF_TP_ADD_TC(tp, dup2_mode);
394 ATF_TP_ADD_TC(tp, dup3_err);
395 ATF_TP_ADD_TC(tp, dup3_max);
396 ATF_TP_ADD_TC(tp, dup3_mode);
397 ATF_TP_ADD_TC(tp, dup_err);
398 ATF_TP_ADD_TC(tp, dup_max);
399 ATF_TP_ADD_TC(tp, dup_mode);
400
401 return atf_no_error();
402 }
403