t_dup.c revision 314817 
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
49static char	path[] = "dup";
50#ifdef __NetBSD__
51static void	check_mode(bool, bool, bool);
52#endif
53
54static void
55check_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
106ATF_TC(dup2_basic);
107ATF_TC_HEAD(dup2_basic, tc)
108{
109	atf_tc_set_md_var(tc, "descr", "A basic test of dup2(2)");
110}
111
112ATF_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
134ATF_TC(dup2_err);
135ATF_TC_HEAD(dup2_err, tc)
136{
137	atf_tc_set_md_var(tc, "descr", "Test error conditions of dup2(2)");
138}
139
140ATF_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
164ATF_TC(dup2_max);
165ATF_TC_HEAD(dup2_max, tc)
166{
167	atf_tc_set_md_var(tc, "descr", "Test dup2(2) against limits");
168}
169
170ATF_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
181ATF_TC_WITH_CLEANUP(dup2_mode);
182ATF_TC_HEAD(dup2_mode, tc)
183{
184	atf_tc_set_md_var(tc, "descr", "A basic test of dup2(2)");
185}
186
187ATF_TC_BODY(dup2_mode, tc)
188{
189	check_mode(false, true, false);
190}
191
192ATF_TC_CLEANUP(dup2_mode, tc)
193{
194	(void)unlink(path);
195}
196
197
198ATF_TC(dup3_err);
199ATF_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
205ATF_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
244ATF_TC(dup3_max);
245ATF_TC_HEAD(dup3_max, tc)
246{
247	atf_tc_set_md_var(tc, "descr", "Test dup3(2) against limits");
248}
249
250ATF_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
262ATF_TC_WITH_CLEANUP(dup3_mode);
263ATF_TC_HEAD(dup3_mode, tc)
264{
265	atf_tc_set_md_var(tc, "descr", "A basic test of dup3(2)");
266}
267
268ATF_TC_BODY(dup3_mode, tc)
269{
270	check_mode(false, false, true);
271}
272
273ATF_TC_CLEANUP(dup3_mode, tc)
274{
275	(void)unlink(path);
276}
277
278ATF_TC(dup_err);
279ATF_TC_HEAD(dup_err, tc)
280{
281	atf_tc_set_md_var(tc, "descr", "Test error conditions of dup(2)");
282}
283
284ATF_TC_BODY(dup_err, tc)
285{
286
287	errno = 0;
288	ATF_REQUIRE_ERRNO(EBADF, dup(-1) == -1);
289}
290
291ATF_TC_WITH_CLEANUP(dup_max);
292ATF_TC_HEAD(dup_max, tc)
293{
294	atf_tc_set_md_var(tc, "descr", "Test dup(2) against limits");
295}
296
297ATF_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
366ATF_TC_CLEANUP(dup_max, tc)
367{
368	(void)unlink(path);
369}
370
371ATF_TC_WITH_CLEANUP(dup_mode);
372ATF_TC_HEAD(dup_mode, tc)
373{
374	atf_tc_set_md_var(tc, "descr", "A basic test of dup(2)");
375}
376
377ATF_TC_BODY(dup_mode, tc)
378{
379	check_mode(true, false, false);
380}
381
382ATF_TC_CLEANUP(dup_mode, tc)
383{
384	(void)unlink(path);
385}
386
387ATF_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