1 /* $NetBSD: t_msgsnd.c,v 1.3 2017/01/13 20:44:45 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_msgsnd.c,v 1.3 2017/01/13 20:44:45 christos 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 <limits.h> 42 #include <pwd.h> 43 #include <signal.h> 44 #include <stdio.h> 45 #include <stdlib.h> 46 #include <string.h> 47 #include <sysexits.h> 48 #include <time.h> 49 #include <unistd.h> 50 51 #ifdef __FreeBSD__ 52 #include <limits.h> 53 #endif 54 55 #define MSG_KEY 1234 56 #define MSG_MTYPE_1 0x41 57 #define MSG_MTYPE_2 0x42 58 #define MSG_MTYPE_3 0x43 59 60 struct msg { 61 long mtype; 62 char buf[3]; 63 }; 64 65 static void clean(void); 66 67 static void 68 clean(void) 69 { 70 int id; 71 72 if ((id = msgget(MSG_KEY, 0)) != -1) 73 (void)msgctl(id, IPC_RMID, 0); 74 } 75 76 ATF_TC_WITH_CLEANUP(msgsnd_block); 77 ATF_TC_HEAD(msgsnd_block, tc) 78 { 79 atf_tc_set_md_var(tc, "descr", "Test that msgsnd(2) blocks"); 80 atf_tc_set_md_var(tc, "timeout", "10"); 81 } 82 83 ATF_TC_BODY(msgsnd_block, tc) 84 { 85 struct msg msg = { MSG_MTYPE_1, { 'a', 'b', 'c' } }; 86 int id, sta; 87 pid_t pid; 88 89 id = msgget(MSG_KEY, IPC_CREAT | 0600); 90 ATF_REQUIRE(id != -1); 91 92 pid = fork(); 93 ATF_REQUIRE(pid >= 0); 94 95 if (pid == 0) { 96 97 /* 98 * Enqueue messages until some limit (e.g. the maximum 99 * number of messages in the queue or the maximum number 100 * of bytes in the queue) is reached. After this the call 101 * should block when the IPC_NOWAIT is not set. 102 */ 103 for (;;) { 104 105 if (msgsnd(id, &msg, sizeof(struct msg), 0) < 0) 106 _exit(EXIT_FAILURE); 107 } 108 } 109 110 (void)sleep(2); 111 (void)kill(pid, SIGKILL); 112 (void)wait(&sta); 113 114 if (WIFEXITED(sta) != 0 || WIFSIGNALED(sta) == 0) 115 atf_tc_fail("msgsnd(2) did not block"); 116 117 ATF_REQUIRE(msgctl(id, IPC_RMID, 0) == 0); 118 } 119 120 ATF_TC_CLEANUP(msgsnd_block, tc) 121 { 122 clean(); 123 } 124 125 ATF_TC_WITH_CLEANUP(msgsnd_count); 126 ATF_TC_HEAD(msgsnd_count, tc) 127 { 128 atf_tc_set_md_var(tc, "descr", 129 "Test that msgsnd(2) increments the amount of " 130 "message in the queue, as given by msgctl(2)"); 131 atf_tc_set_md_var(tc, "timeout", "10"); 132 } 133 134 ATF_TC_BODY(msgsnd_count, tc) 135 { 136 struct msg msg = { MSG_MTYPE_1, { 'a', 'b', 'c' } }; 137 struct msqid_ds ds; 138 size_t i = 0; 139 int id, rv; 140 141 id = msgget(MSG_KEY, IPC_CREAT | 0600); 142 ATF_REQUIRE(id != -1); 143 144 for (;;) { 145 146 errno = 0; 147 rv = msgsnd(id, &msg, sizeof(struct msg), IPC_NOWAIT); 148 149 if (rv == 0) { 150 i++; 151 continue; 152 } 153 154 if (rv == -1 && errno == EAGAIN) 155 break; 156 157 atf_tc_fail("failed to enqueue a message"); 158 } 159 160 (void)memset(&ds, 0, sizeof(struct msqid_ds)); 161 (void)msgctl(id, IPC_STAT, &ds); 162 163 if (ds.msg_qnum != i) 164 atf_tc_fail("incorrect message count"); 165 166 ATF_REQUIRE(msgctl(id, IPC_RMID, 0) == 0); 167 } 168 169 ATF_TC_CLEANUP(msgsnd_count, tc) 170 { 171 clean(); 172 } 173 174 ATF_TC_WITH_CLEANUP(msgsnd_err); 175 ATF_TC_HEAD(msgsnd_err, tc) 176 { 177 atf_tc_set_md_var(tc, "descr", "Test errors from msgsnd(2)"); 178 } 179 180 ATF_TC_BODY(msgsnd_err, tc) 181 { 182 struct msg msg = { MSG_MTYPE_1, { 'a', 'b', 'c' } }; 183 int id; 184 185 id = msgget(MSG_KEY, IPC_CREAT | 0600); 186 ATF_REQUIRE(id != -1); 187 188 errno = 0; 189 190 ATF_REQUIRE_ERRNO(EFAULT, msgsnd(id, (void *)-1, 191 sizeof(struct msg), IPC_NOWAIT) == -1); 192 193 errno = 0; 194 195 ATF_REQUIRE_ERRNO(EINVAL, msgsnd(-1, &msg, 196 sizeof(struct msg), IPC_NOWAIT) == -1); 197 198 errno = 0; 199 200 ATF_REQUIRE_ERRNO(EINVAL, msgsnd(-1, &msg, 201 SSIZE_MAX, IPC_NOWAIT) == -1); 202 203 errno = 0; 204 msg.mtype = 0; 205 206 ATF_REQUIRE_ERRNO(EINVAL, msgsnd(id, &msg, 207 sizeof(struct msg), IPC_NOWAIT) == -1); 208 209 ATF_REQUIRE(msgctl(id, IPC_RMID, 0) == 0); 210 } 211 212 ATF_TC_CLEANUP(msgsnd_err, tc) 213 { 214 clean(); 215 } 216 217 ATF_TC_WITH_CLEANUP(msgsnd_nonblock); 218 ATF_TC_HEAD(msgsnd_nonblock, tc) 219 { 220 atf_tc_set_md_var(tc, "descr", "Test msgsnd(2) with IPC_NOWAIT"); 221 atf_tc_set_md_var(tc, "timeout", "10"); 222 } 223 224 ATF_TC_BODY(msgsnd_nonblock, tc) 225 { 226 struct msg msg = { MSG_MTYPE_1, { 'a', 'b', 'c' } }; 227 int id, rv, sta; 228 pid_t pid; 229 230 id = msgget(MSG_KEY, IPC_CREAT | 0600); 231 ATF_REQUIRE(id != -1); 232 233 pid = fork(); 234 ATF_REQUIRE(pid >= 0); 235 236 if (pid == 0) { 237 238 for (;;) { 239 240 errno = 0; 241 rv = msgsnd(id, &msg, sizeof(struct msg), IPC_NOWAIT); 242 243 if (rv == -1 && errno == EAGAIN) 244 _exit(EXIT_SUCCESS); 245 } 246 } 247 248 (void)sleep(2); 249 (void)kill(pid, SIGKILL); 250 (void)wait(&sta); 251 252 if (WIFEXITED(sta) == 0 || WIFSIGNALED(sta) != 0) 253 atf_tc_fail("msgsnd(2) blocked with IPC_NOWAIT"); 254 255 ATF_REQUIRE(msgctl(id, IPC_RMID, 0) == 0); 256 } 257 258 ATF_TC_CLEANUP(msgsnd_nonblock, tc) 259 { 260 clean(); 261 } 262 263 ATF_TC_WITH_CLEANUP(msgsnd_perm); 264 ATF_TC_HEAD(msgsnd_perm, tc) 265 { 266 atf_tc_set_md_var(tc, "descr", "Test permissions with msgsnd(2)"); 267 atf_tc_set_md_var(tc, "require.user", "root"); 268 } 269 270 ATF_TC_BODY(msgsnd_perm, tc) 271 { 272 struct msg msg = { MSG_MTYPE_1, { 'a', 'b', 'c' } }; 273 struct passwd *pw; 274 int id, sta; 275 pid_t pid; 276 uid_t uid; 277 278 pw = getpwnam("nobody"); 279 id = msgget(MSG_KEY, IPC_CREAT | 0600); 280 281 ATF_REQUIRE(id != -1); 282 ATF_REQUIRE(pw != NULL); 283 284 uid = pw->pw_uid; 285 ATF_REQUIRE(uid != 0); 286 287 pid = fork(); 288 ATF_REQUIRE(pid >= 0); 289 290 if (pid == 0) { 291 292 /* 293 * Try to enqueue a message to the queue 294 * created by root as RW for owner only. 295 */ 296 if (setuid(uid) != 0) 297 _exit(EX_OSERR); 298 299 id = msgget(MSG_KEY, 0); 300 301 if (id == -1) 302 _exit(EX_OSERR); 303 304 errno = 0; 305 306 if (msgsnd(id, &msg, sizeof(struct msg), IPC_NOWAIT) == 0) 307 _exit(EXIT_FAILURE); 308 309 if (errno != EACCES) 310 _exit(EXIT_FAILURE); 311 312 _exit(EXIT_SUCCESS); 313 } 314 315 (void)wait(&sta); 316 317 if (WIFEXITED(sta) == 0 || WEXITSTATUS(sta) != EXIT_SUCCESS) { 318 319 if (errno == EX_OSERR) 320 atf_tc_fail("system call failed"); 321 322 atf_tc_fail("UID %u enqueued message to root's queue", uid); 323 } 324 325 ATF_REQUIRE(msgctl(id, IPC_RMID, 0) == 0); 326 } 327 328 ATF_TC_CLEANUP(msgsnd_perm, tc) 329 { 330 clean(); 331 } 332 333 ATF_TP_ADD_TCS(tp) 334 { 335 336 ATF_TP_ADD_TC(tp, msgsnd_block); 337 ATF_TP_ADD_TC(tp, msgsnd_count); 338 ATF_TP_ADD_TC(tp, msgsnd_err); 339 ATF_TP_ADD_TC(tp, msgsnd_nonblock); 340 ATF_TP_ADD_TC(tp, msgsnd_perm); 341 342 return atf_no_error(); 343 } 344