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 #define MSG_KEY 1234 52 #define MSG_MTYPE_1 0x41 53 #define MSG_MTYPE_2 0x42 54 #define MSG_MTYPE_3 0x43 55 56 struct msg { 57 long mtype; 58 char buf[3]; 59 }; 60 61 static void clean(void); 62 63 static void 64 clean(void) 65 { 66 int id; 67 68 if ((id = msgget(MSG_KEY, 0)) != -1) 69 (void)msgctl(id, IPC_RMID, 0); 70 } 71 72 ATF_TC_WITH_CLEANUP(msgsnd_block); 73 ATF_TC_HEAD(msgsnd_block, tc) 74 { 75 atf_tc_set_md_var(tc, "descr", "Test that msgsnd(2) blocks"); 76 atf_tc_set_md_var(tc, "timeout", "10"); 77 } 78 79 ATF_TC_BODY(msgsnd_block, tc) 80 { 81 struct msg msg = { MSG_MTYPE_1, { 'a', 'b', 'c' } }; 82 int id, sta; 83 pid_t pid; 84 85 id = msgget(MSG_KEY, IPC_CREAT | 0600); 86 ATF_REQUIRE(id != -1); 87 88 pid = fork(); 89 ATF_REQUIRE(pid >= 0); 90 91 if (pid == 0) { 92 93 /* 94 * Enqueue messages until some limit (e.g. the maximum 95 * number of messages in the queue or the maximum number 96 * of bytes in the queue) is reached. After this the call 97 * should block when the IPC_NOWAIT is not set. 98 */ 99 for (;;) { 100 101 #ifdef __FreeBSD__ 102 if (msgsnd(id, &msg, sizeof(msg.buf), 0) < 0) 103 #else 104 if (msgsnd(id, &msg, sizeof(struct msg), 0) < 0) 105 #endif 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 #ifdef __FreeBSD__ 148 rv = msgsnd(id, &msg, sizeof(msg.buf), IPC_NOWAIT); 149 #else 150 rv = msgsnd(id, &msg, sizeof(struct msg), IPC_NOWAIT); 151 #endif 152 153 if (rv == 0) { 154 i++; 155 continue; 156 } 157 158 if (rv == -1 && errno == EAGAIN) 159 break; 160 161 atf_tc_fail("failed to enqueue a message"); 162 } 163 164 (void)memset(&ds, 0, sizeof(struct msqid_ds)); 165 (void)msgctl(id, IPC_STAT, &ds); 166 167 if (ds.msg_qnum != i) 168 atf_tc_fail("incorrect message count"); 169 170 ATF_REQUIRE(msgctl(id, IPC_RMID, 0) == 0); 171 } 172 173 ATF_TC_CLEANUP(msgsnd_count, tc) 174 { 175 clean(); 176 } 177 178 ATF_TC_WITH_CLEANUP(msgsnd_err); 179 ATF_TC_HEAD(msgsnd_err, tc) 180 { 181 atf_tc_set_md_var(tc, "descr", "Test errors from msgsnd(2)"); 182 } 183 184 ATF_TC_BODY(msgsnd_err, tc) 185 { 186 struct msg msg = { MSG_MTYPE_1, { 'a', 'b', 'c' } }; 187 int id; 188 189 id = msgget(MSG_KEY, IPC_CREAT | 0600); 190 ATF_REQUIRE(id != -1); 191 192 errno = 0; 193 194 ATF_REQUIRE_ERRNO(EFAULT, msgsnd(id, (void *)-1, 195 #ifdef __FreeBSD__ 196 sizeof(msg.buf), IPC_NOWAIT) == -1); 197 #else 198 sizeof(struct msg), IPC_NOWAIT) == -1); 199 #endif 200 201 errno = 0; 202 203 ATF_REQUIRE_ERRNO(EINVAL, msgsnd(-1, &msg, 204 #ifdef __FreeBSD__ 205 sizeof(msg.buf), IPC_NOWAIT) == -1); 206 #else 207 sizeof(struct msg), IPC_NOWAIT) == -1); 208 #endif 209 210 errno = 0; 211 212 ATF_REQUIRE_ERRNO(EINVAL, msgsnd(-1, &msg, 213 SSIZE_MAX, IPC_NOWAIT) == -1); 214 215 errno = 0; 216 msg.mtype = 0; 217 218 ATF_REQUIRE_ERRNO(EINVAL, msgsnd(id, &msg, 219 #ifdef __FreeBSD__ 220 sizeof(msg.buf), IPC_NOWAIT) == -1); 221 #else 222 sizeof(struct msg), IPC_NOWAIT) == -1); 223 #endif 224 225 ATF_REQUIRE(msgctl(id, IPC_RMID, 0) == 0); 226 } 227 228 ATF_TC_CLEANUP(msgsnd_err, tc) 229 { 230 clean(); 231 } 232 233 ATF_TC_WITH_CLEANUP(msgsnd_nonblock); 234 ATF_TC_HEAD(msgsnd_nonblock, tc) 235 { 236 atf_tc_set_md_var(tc, "descr", "Test msgsnd(2) with IPC_NOWAIT"); 237 atf_tc_set_md_var(tc, "timeout", "10"); 238 } 239 240 ATF_TC_BODY(msgsnd_nonblock, tc) 241 { 242 struct msg msg = { MSG_MTYPE_1, { 'a', 'b', 'c' } }; 243 int id, rv, sta; 244 pid_t pid; 245 246 id = msgget(MSG_KEY, IPC_CREAT | 0600); 247 ATF_REQUIRE(id != -1); 248 249 pid = fork(); 250 ATF_REQUIRE(pid >= 0); 251 252 if (pid == 0) { 253 254 for (;;) { 255 256 errno = 0; 257 #ifdef __FreeBSD__ 258 rv = msgsnd(id, &msg, sizeof(msg.buf), IPC_NOWAIT); 259 #else 260 rv = msgsnd(id, &msg, sizeof(struct msg), IPC_NOWAIT); 261 #endif 262 263 if (rv == -1 && errno == EAGAIN) 264 _exit(EXIT_SUCCESS); 265 } 266 } 267 268 (void)sleep(2); 269 (void)kill(pid, SIGKILL); 270 (void)wait(&sta); 271 272 if (WIFEXITED(sta) == 0 || WIFSIGNALED(sta) != 0) 273 atf_tc_fail("msgsnd(2) blocked with IPC_NOWAIT"); 274 275 ATF_REQUIRE(msgctl(id, IPC_RMID, 0) == 0); 276 } 277 278 ATF_TC_CLEANUP(msgsnd_nonblock, tc) 279 { 280 clean(); 281 } 282 283 ATF_TC_WITH_CLEANUP(msgsnd_perm); 284 ATF_TC_HEAD(msgsnd_perm, tc) 285 { 286 atf_tc_set_md_var(tc, "descr", "Test permissions with msgsnd(2)"); 287 atf_tc_set_md_var(tc, "require.user", "root"); 288 } 289 290 ATF_TC_BODY(msgsnd_perm, tc) 291 { 292 struct msg msg = { MSG_MTYPE_1, { 'a', 'b', 'c' } }; 293 struct passwd *pw; 294 int id, sta; 295 pid_t pid; 296 uid_t uid; 297 298 pw = getpwnam("nobody"); 299 id = msgget(MSG_KEY, IPC_CREAT | 0600); 300 301 ATF_REQUIRE(id != -1); 302 ATF_REQUIRE(pw != NULL); 303 304 uid = pw->pw_uid; 305 ATF_REQUIRE(uid != 0); 306 307 pid = fork(); 308 ATF_REQUIRE(pid >= 0); 309 310 if (pid == 0) { 311 312 /* 313 * Try to enqueue a message to the queue 314 * created by root as RW for owner only. 315 */ 316 if (setuid(uid) != 0) 317 _exit(EX_OSERR); 318 319 id = msgget(MSG_KEY, 0); 320 321 if (id == -1) 322 _exit(EX_OSERR); 323 324 errno = 0; 325 326 #ifdef __FreeBSD__ 327 if (msgsnd(id, &msg, sizeof(msg.buf), IPC_NOWAIT) == 0) 328 #else 329 if (msgsnd(id, &msg, sizeof(struct msg), IPC_NOWAIT) == 0) 330 #endif 331 _exit(EXIT_FAILURE); 332 333 if (errno != EACCES) 334 _exit(EXIT_FAILURE); 335 336 _exit(EXIT_SUCCESS); 337 } 338 339 (void)wait(&sta); 340 341 if (WIFEXITED(sta) == 0 || WEXITSTATUS(sta) != EXIT_SUCCESS) { 342 343 if (errno == EX_OSERR) 344 atf_tc_fail("system call failed"); 345 346 atf_tc_fail("UID %u enqueued message to root's queue", uid); 347 } 348 349 ATF_REQUIRE(msgctl(id, IPC_RMID, 0) == 0); 350 } 351 352 ATF_TC_CLEANUP(msgsnd_perm, tc) 353 { 354 clean(); 355 } 356 357 ATF_TP_ADD_TCS(tp) 358 { 359 360 ATF_TP_ADD_TC(tp, msgsnd_block); 361 ATF_TP_ADD_TC(tp, msgsnd_count); 362 ATF_TP_ADD_TC(tp, msgsnd_err); 363 ATF_TP_ADD_TC(tp, msgsnd_nonblock); 364 ATF_TP_ADD_TC(tp, msgsnd_perm); 365 366 return atf_no_error(); 367 } 368