1 /* $NetBSD: t_kill.c,v 1.2 2024/07/15 06:19:07 riastradh 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_kill.c,v 1.2 2024/07/15 06:19:07 riastradh Exp $"); 33 34 #include <sys/wait.h> 35 36 #include <errno.h> 37 #include <limits.h> 38 #include <pwd.h> 39 #include <signal.h> 40 #include <stdlib.h> 41 #include <unistd.h> 42 43 #include <atf-c.h> 44 45 ATF_TC(kill_basic); 46 ATF_TC_HEAD(kill_basic, tc) 47 { 48 atf_tc_set_md_var(tc, "descr", "Test that kill(2) works"); 49 } 50 51 ATF_TC_BODY(kill_basic, tc) 52 { 53 const int sig[] = { SIGHUP, SIGINT, SIGKILL, SIGTERM }; 54 pid_t pid; 55 size_t i; 56 int sta; 57 58 for (i = 0; i < __arraycount(sig); i++) { 59 60 pid = fork(); 61 ATF_REQUIRE(pid >= 0); 62 63 switch (pid) { 64 65 case 0: 66 pause(); 67 break; 68 69 default: 70 ATF_REQUIRE(kill(pid, sig[i]) == 0); 71 } 72 73 (void)wait(&sta); 74 75 if (WIFSIGNALED(sta) == 0 || WTERMSIG(sta) != sig[i]) 76 atf_tc_fail("kill(2) failed to kill child"); 77 } 78 } 79 80 ATF_TC(kill_err); 81 ATF_TC_HEAD(kill_err, tc) 82 { 83 atf_tc_set_md_var(tc, "descr", "Test error conditions of kill(2)"); 84 } 85 86 ATF_TC_BODY(kill_err, tc) 87 { 88 int rv, sta; 89 pid_t pid; 90 91 pid = fork(); 92 ATF_REQUIRE(pid >= 0); 93 94 if (pid == 0) { 95 96 errno = 0; 97 rv = kill(getpid(), -1); 98 99 if (rv == 0 || errno != EINVAL) 100 _exit(EINVAL); 101 102 errno = 0; 103 rv = kill(INT_MAX, SIGUSR1); 104 105 if (rv == 0 || errno != ESRCH) 106 _exit(ESRCH); 107 108 _exit(EXIT_SUCCESS); 109 } 110 111 (void)wait(&sta); 112 113 if (WIFEXITED(sta) == 0 || WEXITSTATUS(sta) != EXIT_SUCCESS) { 114 115 if (WEXITSTATUS(sta) == EINVAL) 116 atf_tc_fail("expected EINVAL, but kill(2) succeeded"); 117 118 if (WEXITSTATUS(sta) == ESRCH) 119 atf_tc_fail("expected ESRCH, but kill(2) succeeded"); 120 121 atf_tc_fail("unknown error from kill(2)"); 122 } 123 } 124 125 ATF_TC(kill_perm); 126 ATF_TC_HEAD(kill_perm, tc) 127 { 128 atf_tc_set_md_var(tc, "descr", "Test kill(2) permissions"); 129 atf_tc_set_md_var(tc, "require.user", "root"); 130 } 131 132 ATF_TC_BODY(kill_perm, tc) 133 { 134 struct passwd *pw; 135 pid_t cpid, ppid; 136 uid_t cuid = 0; 137 uid_t puid = 0; 138 int sta; 139 140 /* 141 * Test that kill(2) fails when called 142 * for a PID owned by another user. 143 */ 144 pw = getpwnam("operator"); 145 146 if (pw != NULL) 147 cuid = pw->pw_uid; 148 149 pw = getpwnam("nobody"); 150 151 if (pw != NULL) 152 puid = pw->pw_uid; 153 154 if (cuid == 0 || puid == 0 || cuid == puid) 155 atf_tc_fail("getpwnam(3) failed"); 156 157 ppid = fork(); 158 159 if (ppid < 0) 160 _exit(EXIT_FAILURE); 161 162 if (ppid == 0) { 163 164 cpid = fork(); 165 166 if (cpid < 0) 167 _exit(EXIT_FAILURE); 168 169 if (cpid == 0) { 170 171 if (setuid(cuid) < 0) 172 _exit(EXIT_FAILURE); 173 else { 174 (void)sleep(1); 175 } 176 177 _exit(EXIT_SUCCESS); 178 } 179 180 /* 181 * Try to kill the child after having 182 * set the real and effective UID. 183 */ 184 if (setuid(puid) != 0) 185 _exit(EXIT_FAILURE); 186 187 errno = 0; 188 189 if (kill(cpid, SIGKILL) == 0) 190 _exit(EPERM); 191 192 if (errno != EPERM) 193 _exit(EPERM); 194 195 (void)waitpid(cpid, &sta, 0); 196 197 _exit(EXIT_SUCCESS); 198 } 199 200 (void)waitpid(ppid, &sta, 0); 201 202 if (WIFEXITED(sta) == 0 || WEXITSTATUS(sta) == EPERM) 203 atf_tc_fail("killed a process of another user"); 204 205 if (WIFEXITED(sta) == 0 || WEXITSTATUS(sta) != EXIT_SUCCESS) 206 atf_tc_fail("unknown error from kill(2)"); 207 } 208 209 ATF_TC(kill_pgrp_neg); 210 ATF_TC_HEAD(kill_pgrp_neg, tc) 211 { 212 atf_tc_set_md_var(tc, "descr", "Test kill(2) with process group, #2"); 213 } 214 215 ATF_TC_BODY(kill_pgrp_neg, tc) 216 { 217 const int maxiter = 3; 218 pid_t cpid, ppid; 219 int i, sta; 220 221 ppid = fork(); 222 ATF_REQUIRE(ppid >= 0); 223 224 if (ppid == 0) { 225 226 ATF_REQUIRE(setpgid(0, 0) == 0); 227 228 for (i = 0; i < maxiter; i++) { 229 230 cpid = fork(); 231 ATF_REQUIRE(cpid >= 0); 232 233 if (cpid == 0) 234 pause(); 235 } 236 237 /* 238 * Test the variant of killpg(3); if the process number 239 * is negative but not -1, the signal should be sent to 240 * all processes whose process group ID is equal to the 241 * absolute value of the process number. 242 */ 243 ATF_REQUIRE(kill(-getpgrp(), SIGKILL) == 0); 244 245 (void)sleep(1); 246 247 _exit(EXIT_SUCCESS); 248 } 249 250 (void)waitpid(ppid, &sta, 0); 251 252 if (WIFSIGNALED(sta) == 0 || WTERMSIG(sta) != SIGKILL) 253 atf_tc_fail("failed to kill(2) a process group"); 254 } 255 256 ATF_TC(kill_pgrp_zero); 257 ATF_TC_HEAD(kill_pgrp_zero, tc) 258 { 259 atf_tc_set_md_var(tc, "descr", "Test kill(2) with process group, #1"); 260 } 261 262 ATF_TC_BODY(kill_pgrp_zero, tc) 263 { 264 const int maxiter = 3; 265 pid_t cpid, ppid; 266 int i, sta; 267 268 ppid = fork(); 269 ATF_REQUIRE(ppid >= 0); 270 271 if (ppid == 0) { 272 273 ATF_REQUIRE(setpgid(0, 0) == 0); 274 275 for (i = 0; i < maxiter; i++) { 276 277 cpid = fork(); 278 ATF_REQUIRE(cpid >= 0); 279 280 if (cpid == 0) 281 pause(); 282 } 283 284 /* 285 * If the supplied process number is zero, 286 * the signal should be sent to all processes 287 * under the current process group. 288 */ 289 ATF_REQUIRE(kill(0, SIGKILL) == 0); 290 291 (void)sleep(1); 292 293 _exit(EXIT_SUCCESS); 294 } 295 296 (void)waitpid(ppid, &sta, 0); 297 298 if (WIFSIGNALED(sta) == 0 || WTERMSIG(sta) != SIGKILL) 299 atf_tc_fail("failed to kill(2) a process group"); 300 } 301 302 ATF_TC(kill_int_min); 303 ATF_TC_HEAD(kill_int_min, tc) 304 { 305 atf_tc_set_md_var(tc, "descr", "Test kill(INT_MIN) fails with ESRCH"); 306 } 307 308 ATF_TC_BODY(kill_int_min, tc) 309 { 310 311 ATF_CHECK_ERRNO(ESRCH, kill(INT_MIN, 0)); 312 } 313 314 ATF_TP_ADD_TCS(tp) 315 { 316 317 ATF_TP_ADD_TC(tp, kill_basic); 318 ATF_TP_ADD_TC(tp, kill_err); 319 ATF_TP_ADD_TC(tp, kill_perm); 320 ATF_TP_ADD_TC(tp, kill_pgrp_neg); 321 ATF_TP_ADD_TC(tp, kill_pgrp_zero); 322 ATF_TP_ADD_TC(tp, kill_int_min); 323 324 return atf_no_error(); 325 } 326
Indexes created Sat Sep 20 22:09:52 GMT 2025