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t_msgsnd.c revision 1.2 
      1 /* $NetBSD: t_msgsnd.c,v 1.2 2011/11/05 08:47:54 jruoho 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_msgsnd.c,v 1.2 2011/11/05 08:47:54 jruoho Exp $");
     33 
     34 #include <sys/msg.h>
     35 #include <sys/stat.h>
     36 #include <sys/sysctl.h>
     37 #include <sys/wait.h>
     38 
     39 #include <atf-c.h>
     40 #include <errno.h>
     41 #include <pwd.h>
     42 #include <signal.h>
     43 #include <stdio.h>
     44 #include <stdlib.h>
     45 #include <string.h>
     46 #include <sysexits.h>
     47 #include <time.h>
     48 #include <unistd.h>
     49 
     50 #define MSG_KEY		1234
     51 #define MSG_MTYPE_1	0x41
     52 #define	MSG_MTYPE_2	0x42
     53 #define MSG_MTYPE_3	0x43
     54 
     55 struct msg {
     56 	long		 mtype;
     57 	char		 buf[3];
     58 };
     59 
     60 static void		clean(void);
     61 
     62 static void
     63 clean(void)
     64 {
     65 	int id;
     66 
     67 	if ((id = msgget(MSG_KEY, 0)) != -1)
     68 		(void)msgctl(id, IPC_RMID, 0);
     69 }
     70 
     71 ATF_TC_WITH_CLEANUP(msgsnd_block);
     72 ATF_TC_HEAD(msgsnd_block, tc)
     73 {
     74 	atf_tc_set_md_var(tc, "descr", "Test that msgsnd(2) blocks");
     75 	atf_tc_set_md_var(tc, "timeout", "10");
     76 }
     77 
     78 ATF_TC_BODY(msgsnd_block, tc)
     79 {
     80 	struct msg msg = { MSG_MTYPE_1, { 'a', 'b', 'c' } };
     81 	int id, sta;
     82 	pid_t pid;
     83 
     84 	id = msgget(MSG_KEY, IPC_CREAT | 0600);
     85 	ATF_REQUIRE(id != -1);
     86 
     87 	pid = fork();
     88 	ATF_REQUIRE(pid >= 0);
     89 
     90 	if (pid == 0) {
     91 
     92 		/*
     93 		 * Enqueue messages until some limit (e.g. the maximum
     94 		 * number of messages in the queue or the maximum number
     95 		 * of bytes in the queue) is reached. After this the call
     96 		 * should block when the IPC_NOWAIT is not set.
     97 		 */
     98 		for (;;) {
     99 
    100 			if (msgsnd(id, &msg, sizeof(struct msg), 0) < 0)
    101 				_exit(EXIT_FAILURE);
    102 		}
    103 	}
    104 
    105 	(void)sleep(2);
    106 	(void)kill(pid, SIGKILL);
    107 	(void)wait(&sta);
    108 
    109 	if (WIFEXITED(sta) != 0 || WIFSIGNALED(sta) == 0)
    110 		atf_tc_fail("msgsnd(2) did not block");
    111 
    112 	ATF_REQUIRE(msgctl(id, IPC_RMID, 0) == 0);
    113 }
    114 
    115 ATF_TC_CLEANUP(msgsnd_block, tc)
    116 {
    117 	clean();
    118 }
    119 
    120 ATF_TC_WITH_CLEANUP(msgsnd_count);
    121 ATF_TC_HEAD(msgsnd_count, tc)
    122 {
    123 	atf_tc_set_md_var(tc, "descr",
    124 	    "Test that msgsnd(2) increments the amount of "
    125 	    "message in the queue, as given by msgctl(2)");
    126 	atf_tc_set_md_var(tc, "timeout", "10");
    127 }
    128 
    129 ATF_TC_BODY(msgsnd_count, tc)
    130 {
    131 	struct msg msg = { MSG_MTYPE_1, { 'a', 'b', 'c' } };
    132 	struct msqid_ds ds;
    133 	size_t i = 0;
    134 	int id, rv;
    135 
    136 	id = msgget(MSG_KEY, IPC_CREAT | 0600);
    137 	ATF_REQUIRE(id != -1);
    138 
    139 	for (;;) {
    140 
    141 		errno = 0;
    142 		rv = msgsnd(id, &msg, sizeof(struct msg), IPC_NOWAIT);
    143 
    144 		if (rv == 0) {
    145 			i++;
    146 			continue;
    147 		}
    148 
    149 		if (rv == -1 && errno == EAGAIN)
    150 			break;
    151 
    152 		atf_tc_fail("failed to enqueue a message");
    153 	}
    154 
    155 	(void)memset(&ds, 0, sizeof(struct msqid_ds));
    156 	(void)msgctl(id, IPC_STAT, &ds);
    157 
    158 	if (ds.msg_qnum != i)
    159 		atf_tc_fail("incorrect message count");
    160 
    161 	ATF_REQUIRE(msgctl(id, IPC_RMID, 0) == 0);
    162 }
    163 
    164 ATF_TC_CLEANUP(msgsnd_count, tc)
    165 {
    166 	clean();
    167 }
    168 
    169 ATF_TC_WITH_CLEANUP(msgsnd_err);
    170 ATF_TC_HEAD(msgsnd_err, tc)
    171 {
    172 	atf_tc_set_md_var(tc, "descr", "Test errors from msgsnd(2)");
    173 }
    174 
    175 ATF_TC_BODY(msgsnd_err, tc)
    176 {
    177 	struct msg msg = { MSG_MTYPE_1, { 'a', 'b', 'c' } };
    178 	int id;
    179 
    180 	id = msgget(MSG_KEY, IPC_CREAT | 0600);
    181 	ATF_REQUIRE(id != -1);
    182 
    183 	errno = 0;
    184 
    185 	ATF_REQUIRE_ERRNO(EFAULT, msgsnd(id, (void *)-1,
    186 		sizeof(struct msg), IPC_NOWAIT) == -1);
    187 
    188 	errno = 0;
    189 
    190 	ATF_REQUIRE_ERRNO(EINVAL, msgsnd(-1, &msg,
    191 		sizeof(struct msg), IPC_NOWAIT) == -1);
    192 
    193 	errno = 0;
    194 
    195 	ATF_REQUIRE_ERRNO(EINVAL, msgsnd(-1, &msg,
    196 		SSIZE_MAX, IPC_NOWAIT) == -1);
    197 
    198 	errno = 0;
    199 	msg.mtype = 0;
    200 
    201 	ATF_REQUIRE_ERRNO(EINVAL, msgsnd(id, &msg,
    202 		sizeof(struct msg), IPC_NOWAIT) == -1);
    203 
    204 	ATF_REQUIRE(msgctl(id, IPC_RMID, 0) == 0);
    205 }
    206 
    207 ATF_TC_CLEANUP(msgsnd_err, tc)
    208 {
    209 	clean();
    210 }
    211 
    212 ATF_TC_WITH_CLEANUP(msgsnd_nonblock);
    213 ATF_TC_HEAD(msgsnd_nonblock, tc)
    214 {
    215 	atf_tc_set_md_var(tc, "descr", "Test msgsnd(2) with IPC_NOWAIT");
    216 	atf_tc_set_md_var(tc, "timeout", "10");
    217 }
    218 
    219 ATF_TC_BODY(msgsnd_nonblock, tc)
    220 {
    221 	struct msg msg = { MSG_MTYPE_1, { 'a', 'b', 'c' } };
    222 	int id, rv, sta;
    223 	pid_t pid;
    224 
    225 	id = msgget(MSG_KEY, IPC_CREAT | 0600);
    226 	ATF_REQUIRE(id != -1);
    227 
    228 	pid = fork();
    229 	ATF_REQUIRE(pid >= 0);
    230 
    231 	if (pid == 0) {
    232 
    233 		for (;;) {
    234 
    235 			errno = 0;
    236 			rv = msgsnd(id, &msg, sizeof(struct msg), IPC_NOWAIT);
    237 
    238 			if (rv == -1 && errno == EAGAIN)
    239 				_exit(EXIT_SUCCESS);
    240 		}
    241 	}
    242 
    243 	(void)sleep(2);
    244 	(void)kill(pid, SIGKILL);
    245 	(void)wait(&sta);
    246 
    247 	if (WIFEXITED(sta) == 0 || WIFSIGNALED(sta) != 0)
    248 		atf_tc_fail("msgsnd(2) blocked with IPC_NOWAIT");
    249 
    250 	ATF_REQUIRE(msgctl(id, IPC_RMID, 0) == 0);
    251 }
    252 
    253 ATF_TC_CLEANUP(msgsnd_nonblock, tc)
    254 {
    255 	clean();
    256 }
    257 
    258 ATF_TC_WITH_CLEANUP(msgsnd_perm);
    259 ATF_TC_HEAD(msgsnd_perm, tc)
    260 {
    261 	atf_tc_set_md_var(tc, "descr", "Test permissions with msgsnd(2)");
    262 	atf_tc_set_md_var(tc, "require.user", "root");
    263 }
    264 
    265 ATF_TC_BODY(msgsnd_perm, tc)
    266 {
    267 	struct msg msg = { MSG_MTYPE_1, { 'a', 'b', 'c' } };
    268 	struct passwd *pw;
    269 	int id, sta;
    270 	pid_t pid;
    271 	uid_t uid;
    272 
    273 	pw = getpwnam("nobody");
    274 	id = msgget(MSG_KEY, IPC_CREAT | 0600);
    275 
    276 	ATF_REQUIRE(id != -1);
    277 	ATF_REQUIRE(pw != NULL);
    278 
    279 	uid = pw->pw_uid;
    280 	ATF_REQUIRE(uid != 0);
    281 
    282 	pid = fork();
    283 	ATF_REQUIRE(pid >= 0);
    284 
    285 	if (pid == 0) {
    286 
    287 		/*
    288 		 * Try to enqueue a message to the queue
    289 		 * created by root as RW for owner only.
    290 		 */
    291 		if (setuid(uid) != 0)
    292 			_exit(EX_OSERR);
    293 
    294 		id = msgget(MSG_KEY, 0);
    295 
    296 		if (id == -1)
    297 			_exit(EX_OSERR);
    298 
    299 		errno = 0;
    300 
    301 		if (msgsnd(id, &msg, sizeof(struct msg), IPC_NOWAIT) == 0)
    302 			_exit(EXIT_FAILURE);
    303 
    304 		if (errno != EACCES)
    305 			_exit(EXIT_FAILURE);
    306 
    307 		_exit(EXIT_SUCCESS);
    308 	}
    309 
    310 	(void)wait(&sta);
    311 
    312 	if (WIFEXITED(sta) == 0 || WEXITSTATUS(sta) != EXIT_SUCCESS) {
    313 
    314 		if (errno == EX_OSERR)
    315 			atf_tc_fail("system call failed");
    316 
    317 		atf_tc_fail("UID %u enqueued message to root's queue", uid);
    318 	}
    319 
    320 	ATF_REQUIRE(msgctl(id, IPC_RMID, 0) == 0);
    321 }
    322 
    323 ATF_TC_CLEANUP(msgsnd_perm, tc)
    324 {
    325 	clean();
    326 }
    327 
    328 ATF_TP_ADD_TCS(tp)
    329 {
    330 
    331 	ATF_TP_ADD_TC(tp, msgsnd_block);
    332 	ATF_TP_ADD_TC(tp, msgsnd_count);
    333 	ATF_TP_ADD_TC(tp, msgsnd_err);
    334 	ATF_TP_ADD_TC(tp, msgsnd_nonblock);
    335 	ATF_TP_ADD_TC(tp, msgsnd_perm);
    336 
    337 	return atf_no_error();
    338 }
    339