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 if (msgsnd(id, &msg, sizeof(struct msg), 0) < 0) 102 _exit(EXIT_FAILURE); 103 } 104 } 105 106 (void)sleep(2); 107 (void)kill(pid, SIGKILL); 108 (void)wait(&sta); 109 110 if (WIFEXITED(sta) != 0 || WIFSIGNALED(sta) == 0) 111 atf_tc_fail("msgsnd(2) did not block"); 112 113 ATF_REQUIRE(msgctl(id, IPC_RMID, 0) == 0); 114 } 115 116 ATF_TC_CLEANUP(msgsnd_block, tc) 117 { 118 clean(); 119 } 120 121 ATF_TC_WITH_CLEANUP(msgsnd_count); 122 ATF_TC_HEAD(msgsnd_count, tc) 123 { 124 atf_tc_set_md_var(tc, "descr", 125 "Test that msgsnd(2) increments the amount of " 126 "message in the queue, as given by msgctl(2)"); 127 atf_tc_set_md_var(tc, "timeout", "10"); 128 } 129 130 ATF_TC_BODY(msgsnd_count, tc) 131 { 132 struct msg msg = { MSG_MTYPE_1, { 'a', 'b', 'c' } }; 133 struct msqid_ds ds; 134 size_t i = 0; 135 int id, rv; 136 137 id = msgget(MSG_KEY, IPC_CREAT | 0600); 138 ATF_REQUIRE(id != -1); 139 140 for (;;) { 141 142 errno = 0; 143 rv = msgsnd(id, &msg, sizeof(struct msg), IPC_NOWAIT); 144 145 if (rv == 0) { 146 i++; 147 continue; 148 } 149 150 if (rv == -1 && errno == EAGAIN) 151 break; 152 153 atf_tc_fail("failed to enqueue a message"); 154 } 155 156 (void)memset(&ds, 0, sizeof(struct msqid_ds)); 157 (void)msgctl(id, IPC_STAT, &ds); 158 159 if (ds.msg_qnum != i) 160 atf_tc_fail("incorrect message count"); 161 162 ATF_REQUIRE(msgctl(id, IPC_RMID, 0) == 0); 163 } 164 165 ATF_TC_CLEANUP(msgsnd_count, tc) 166 { 167 clean(); 168 } 169 170 ATF_TC_WITH_CLEANUP(msgsnd_err); 171 ATF_TC_HEAD(msgsnd_err, tc) 172 { 173 atf_tc_set_md_var(tc, "descr", "Test errors from msgsnd(2)"); 174 } 175 176 ATF_TC_BODY(msgsnd_err, tc) 177 { 178 struct msg msg = { MSG_MTYPE_1, { 'a', 'b', 'c' } }; 179 int id; 180 181 id = msgget(MSG_KEY, IPC_CREAT | 0600); 182 ATF_REQUIRE(id != -1); 183 184 errno = 0; 185 186 ATF_REQUIRE_ERRNO(EFAULT, msgsnd(id, (void *)-1, 187 sizeof(struct msg), IPC_NOWAIT) == -1); 188 189 errno = 0; 190 191 ATF_REQUIRE_ERRNO(EINVAL, msgsnd(-1, &msg, 192 sizeof(struct msg), IPC_NOWAIT) == -1); 193 194 errno = 0; 195 196 ATF_REQUIRE_ERRNO(EINVAL, msgsnd(-1, &msg, 197 SSIZE_MAX, IPC_NOWAIT) == -1); 198 199 errno = 0; 200 msg.mtype = 0; 201 202 ATF_REQUIRE_ERRNO(EINVAL, msgsnd(id, &msg, 203 sizeof(struct msg), IPC_NOWAIT) == -1); 204 205 ATF_REQUIRE(msgctl(id, IPC_RMID, 0) == 0); 206 } 207 208 ATF_TC_CLEANUP(msgsnd_err, tc) 209 { 210 clean(); 211 } 212 213 ATF_TC_WITH_CLEANUP(msgsnd_nonblock); 214 ATF_TC_HEAD(msgsnd_nonblock, tc) 215 { 216 atf_tc_set_md_var(tc, "descr", "Test msgsnd(2) with IPC_NOWAIT"); 217 atf_tc_set_md_var(tc, "timeout", "10"); 218 } 219 220 ATF_TC_BODY(msgsnd_nonblock, tc) 221 { 222 struct msg msg = { MSG_MTYPE_1, { 'a', 'b', 'c' } }; 223 int id, rv, sta; 224 pid_t pid; 225 226 id = msgget(MSG_KEY, IPC_CREAT | 0600); 227 ATF_REQUIRE(id != -1); 228 229 pid = fork(); 230 ATF_REQUIRE(pid >= 0); 231 232 if (pid == 0) { 233 234 for (;;) { 235 236 errno = 0; 237 rv = msgsnd(id, &msg, sizeof(struct msg), IPC_NOWAIT); 238 239 if (rv == -1 && errno == EAGAIN) 240 _exit(EXIT_SUCCESS); 241 } 242 } 243 244 (void)sleep(2); 245 (void)kill(pid, SIGKILL); 246 (void)wait(&sta); 247 248 if (WIFEXITED(sta) == 0 || WIFSIGNALED(sta) != 0) 249 atf_tc_fail("msgsnd(2) blocked with IPC_NOWAIT"); 250 251 ATF_REQUIRE(msgctl(id, IPC_RMID, 0) == 0); 252 } 253 254 ATF_TC_CLEANUP(msgsnd_nonblock, tc) 255 { 256 clean(); 257 } 258 259 ATF_TC_WITH_CLEANUP(msgsnd_perm); 260 ATF_TC_HEAD(msgsnd_perm, tc) 261 { 262 atf_tc_set_md_var(tc, "descr", "Test permissions with msgsnd(2)"); 263 atf_tc_set_md_var(tc, "require.user", "root"); 264 } 265 266 ATF_TC_BODY(msgsnd_perm, tc) 267 { 268 struct msg msg = { MSG_MTYPE_1, { 'a', 'b', 'c' } }; 269 struct passwd *pw; 270 int id, sta; 271 pid_t pid; 272 uid_t uid; 273 274 pw = getpwnam("nobody"); 275 id = msgget(MSG_KEY, IPC_CREAT | 0600); 276 277 ATF_REQUIRE(id != -1); 278 ATF_REQUIRE(pw != NULL); 279 280 uid = pw->pw_uid; 281 ATF_REQUIRE(uid != 0); 282 283 pid = fork(); 284 ATF_REQUIRE(pid >= 0); 285 286 if (pid == 0) { 287 288 /* 289 * Try to enqueue a message to the queue 290 * created by root as RW for owner only. 291 */ 292 if (setuid(uid) != 0) 293 _exit(EX_OSERR); 294 295 id = msgget(MSG_KEY, 0); 296 297 if (id == -1) 298 _exit(EX_OSERR); 299 300 errno = 0; 301 302 if (msgsnd(id, &msg, sizeof(struct msg), IPC_NOWAIT) == 0) 303 _exit(EXIT_FAILURE); 304 305 if (errno != EACCES) 306 _exit(EXIT_FAILURE); 307 308 _exit(EXIT_SUCCESS); 309 } 310 311 (void)wait(&sta); 312 313 if (WIFEXITED(sta) == 0 || WEXITSTATUS(sta) != EXIT_SUCCESS) { 314 315 if (errno == EX_OSERR) 316 atf_tc_fail("system call failed"); 317 318 atf_tc_fail("UID %u enqueued message to root's queue", uid); 319 } 320 321 ATF_REQUIRE(msgctl(id, IPC_RMID, 0) == 0); 322 } 323 324 ATF_TC_CLEANUP(msgsnd_perm, tc) 325 { 326 clean(); 327 } 328 329 ATF_TP_ADD_TCS(tp) 330 { 331 332 ATF_TP_ADD_TC(tp, msgsnd_block); 333 ATF_TP_ADD_TC(tp, msgsnd_count); 334 ATF_TP_ADD_TC(tp, msgsnd_err); 335 ATF_TP_ADD_TC(tp, msgsnd_nonblock); 336 ATF_TP_ADD_TC(tp, msgsnd_perm); 337 338 return atf_no_error(); 339 } 340