1 /* $OpenBSD: t_kill.c,v 1.1.1.1 2019/11/19 19:57:03 bluhm Exp $ */ 2 /* $NetBSD: t_kill.c,v 1.1 2011/07/07 06:57:53 jruoho Exp $ */ 3 4 /*- 5 * Copyright (c) 2011 The NetBSD Foundation, Inc. 6 * All rights reserved. 7 * 8 * This code is derived from software contributed to The NetBSD Foundation 9 * by Jukka Ruohonen. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 21 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 22 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 23 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 24 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 25 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 26 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 27 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 28 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 29 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 30 * POSSIBILITY OF SUCH DAMAGE. 31 */ 32 33 #include "macros.h" 34 35 #include <sys/cdefs.h> 36 __RCSID("$NetBSD: t_kill.c,v 1.1 2011/07/07 06:57:53 jruoho Exp $"); 37 38 #include <sys/wait.h> 39 40 #include <errno.h> 41 #include <limits.h> 42 #include <pwd.h> 43 #include <signal.h> 44 #include <stdlib.h> 45 #include <unistd.h> 46 47 #include "atf-c.h" 48 49 ATF_TC(kill_basic); 50 ATF_TC_HEAD(kill_basic, tc) 51 { 52 atf_tc_set_md_var(tc, "descr", "Test that kill(2) works"); 53 } 54 55 ATF_TC_BODY(kill_basic, tc) 56 { 57 const int sig[] = { SIGHUP, SIGINT, SIGKILL, SIGTERM }; 58 pid_t pid; 59 size_t i; 60 int sta; 61 62 for (i = 0; i < __arraycount(sig); i++) { 63 64 pid = fork(); 65 ATF_REQUIRE(pid >= 0); 66 67 switch (pid) { 68 69 case 0: 70 pause(); 71 break; 72 73 default: 74 ATF_REQUIRE(kill(pid, sig[i]) == 0); 75 } 76 77 (void)wait(&sta); 78 79 if (WIFSIGNALED(sta) == 0 || WTERMSIG(sta) != sig[i]) 80 atf_tc_fail("kill(2) failed to kill child"); 81 } 82 } 83 84 ATF_TC(kill_err); 85 ATF_TC_HEAD(kill_err, tc) 86 { 87 atf_tc_set_md_var(tc, "descr", "Test error conditions of kill(2)"); 88 } 89 90 ATF_TC_BODY(kill_err, tc) 91 { 92 int rv, sta; 93 pid_t pid; 94 95 pid = fork(); 96 ATF_REQUIRE(pid >= 0); 97 98 if (pid == 0) { 99 100 errno = 0; 101 rv = kill(getpid(), -1); 102 103 if (rv == 0 || errno != EINVAL) 104 _exit(EINVAL); 105 106 errno = 0; 107 rv = kill(INT_MAX, SIGUSR1); 108 109 if (rv == 0 || errno != ESRCH) 110 _exit(ESRCH); 111 112 _exit(EXIT_SUCCESS); 113 } 114 115 (void)wait(&sta); 116 117 if (WIFEXITED(sta) == 0 || WEXITSTATUS(sta) != EXIT_SUCCESS) { 118 119 if (WEXITSTATUS(sta) == EINVAL) 120 atf_tc_fail("expected EINVAL, but kill(2) succeeded"); 121 122 if (WEXITSTATUS(sta) == ESRCH) 123 atf_tc_fail("expected ESRCH, but kill(2) succeeded"); 124 125 atf_tc_fail("unknown error from kill(2)"); 126 } 127 } 128 129 ATF_TC(kill_perm); 130 ATF_TC_HEAD(kill_perm, tc) 131 { 132 atf_tc_set_md_var(tc, "descr", "Test kill(2) permissions"); 133 atf_tc_set_md_var(tc, "require.user", "root"); 134 } 135 136 ATF_TC_BODY(kill_perm, tc) 137 { 138 struct passwd *pw; 139 pid_t cpid, ppid; 140 uid_t cuid = 0; 141 uid_t puid = 0; 142 int sta; 143 144 /* 145 * Test that kill(2) fails when called 146 * for a PID owned by another user. 147 */ 148 pw = getpwnam("operator"); 149 150 if (pw != NULL) 151 cuid = pw->pw_uid; 152 153 pw = getpwnam("nobody"); 154 155 if (pw != NULL) 156 puid = pw->pw_uid; 157 158 if (cuid == 0 || puid == 0 || cuid == puid) 159 atf_tc_fail("getpwnam(3) failed"); 160 161 ppid = fork(); 162 163 if (ppid < 0) 164 _exit(EXIT_FAILURE); 165 166 if (ppid == 0) { 167 168 cpid = fork(); 169 170 if (cpid < 0) 171 _exit(EXIT_FAILURE); 172 173 if (cpid == 0) { 174 175 if (setuid(cuid) < 0) 176 _exit(EXIT_FAILURE); 177 else { 178 (void)sleep(1); 179 } 180 181 _exit(EXIT_SUCCESS); 182 } 183 184 /* 185 * Try to kill the child after having 186 * set the real and effective UID. 187 */ 188 if (setuid(puid) != 0) 189 _exit(EXIT_FAILURE); 190 191 errno = 0; 192 193 if (kill(cpid, SIGKILL) == 0) 194 _exit(EPERM); 195 196 if (errno != EPERM) 197 _exit(EPERM); 198 199 (void)waitpid(cpid, &sta, 0); 200 201 _exit(EXIT_SUCCESS); 202 } 203 204 (void)waitpid(ppid, &sta, 0); 205 206 if (WIFEXITED(sta) == 0 || WEXITSTATUS(sta) == EPERM) 207 atf_tc_fail("killed a process of another user"); 208 209 if (WIFEXITED(sta) == 0 || WEXITSTATUS(sta) != EXIT_SUCCESS) 210 atf_tc_fail("unknown error from kill(2)"); 211 } 212 213 ATF_TC(kill_pgrp_neg); 214 ATF_TC_HEAD(kill_pgrp_neg, tc) 215 { 216 atf_tc_set_md_var(tc, "descr", "Test kill(2) with process group, #2"); 217 } 218 219 ATF_TC_BODY(kill_pgrp_neg, tc) 220 { 221 const int maxiter = 3; 222 pid_t cpid, ppid; 223 int i, sta; 224 225 ppid = fork(); 226 ATF_REQUIRE(ppid >= 0); 227 228 if (ppid == 0) { 229 230 ATF_REQUIRE(setpgid(0, 0) == 0); 231 232 for (i = 0; i < maxiter; i++) { 233 234 cpid = fork(); 235 ATF_REQUIRE(cpid >= 0); 236 237 if (cpid == 0) 238 pause(); 239 } 240 241 /* 242 * Test the variant of killpg(3); if the process number 243 * is negative but not -1, the signal should be sent to 244 * all processes whose process group ID is equal to the 245 * absolute value of the process number. 246 */ 247 ATF_REQUIRE(kill(-getpgrp(), SIGKILL) == 0); 248 249 (void)sleep(1); 250 251 _exit(EXIT_SUCCESS); 252 } 253 254 (void)waitpid(ppid, &sta, 0); 255 256 if (WIFSIGNALED(sta) == 0 || WTERMSIG(sta) != SIGKILL) 257 atf_tc_fail("failed to kill(2) a process group"); 258 } 259 260 ATF_TC(kill_pgrp_zero); 261 ATF_TC_HEAD(kill_pgrp_zero, tc) 262 { 263 atf_tc_set_md_var(tc, "descr", "Test kill(2) with process group, #1"); 264 } 265 266 ATF_TC_BODY(kill_pgrp_zero, tc) 267 { 268 const int maxiter = 3; 269 pid_t cpid, ppid; 270 int i, sta; 271 272 ppid = fork(); 273 ATF_REQUIRE(ppid >= 0); 274 275 if (ppid == 0) { 276 277 ATF_REQUIRE(setpgid(0, 0) == 0); 278 279 for (i = 0; i < maxiter; i++) { 280 281 cpid = fork(); 282 ATF_REQUIRE(cpid >= 0); 283 284 if (cpid == 0) 285 pause(); 286 } 287 288 /* 289 * If the supplied process number is zero, 290 * the signal should be sent to all processes 291 * under the current process group. 292 */ 293 ATF_REQUIRE(kill(0, SIGKILL) == 0); 294 295 (void)sleep(1); 296 297 _exit(EXIT_SUCCESS); 298 } 299 300 (void)waitpid(ppid, &sta, 0); 301 302 if (WIFSIGNALED(sta) == 0 || WTERMSIG(sta) != SIGKILL) 303 atf_tc_fail("failed to kill(2) a process group"); 304 } 305 306 ATF_TP_ADD_TCS(tp) 307 { 308 309 ATF_TP_ADD_TC(tp, kill_basic); 310 ATF_TP_ADD_TC(tp, kill_err); 311 ATF_TP_ADD_TC(tp, kill_perm); 312 ATF_TP_ADD_TC(tp, kill_pgrp_neg); 313 ATF_TP_ADD_TC(tp, kill_pgrp_zero); 314 315 return atf_no_error(); 316 } 317