1 /* $OpenBSD: t_kill.c,v 1.4 2021/12/13 16:56:48 deraadt 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/wait.h> 36 37 #include <errno.h> 38 #include <limits.h> 39 #include <pwd.h> 40 #include <signal.h> 41 #include <stdlib.h> 42 #include <unistd.h> 43 44 #include "atf-c.h" 45 46 ATF_TC(kill_basic); 47 ATF_TC_HEAD(kill_basic, tc) 48 { 49 atf_tc_set_md_var(tc, "descr", "Test that kill(2) works"); 50 } 51 52 ATF_TC_BODY(kill_basic, tc) 53 { 54 const int sig[] = { SIGHUP, SIGINT, SIGKILL, SIGTERM }; 55 pid_t pid; 56 size_t i; 57 int sta; 58 59 for (i = 0; i < __arraycount(sig); i++) { 60 61 pid = fork(); 62 ATF_REQUIRE(pid >= 0); 63 64 switch (pid) { 65 66 case 0: 67 pause(); 68 break; 69 70 default: 71 ATF_REQUIRE(kill(pid, sig[i]) == 0); 72 } 73 74 (void)wait(&sta); 75 76 if (WIFSIGNALED(sta) == 0 || WTERMSIG(sta) != sig[i]) 77 atf_tc_fail("kill(2) failed to kill child"); 78 } 79 } 80 81 ATF_TC(kill_err); 82 ATF_TC_HEAD(kill_err, tc) 83 { 84 atf_tc_set_md_var(tc, "descr", "Test error conditions of kill(2)"); 85 } 86 87 ATF_TC_BODY(kill_err, tc) 88 { 89 int rv, sta; 90 pid_t pid; 91 92 pid = fork(); 93 ATF_REQUIRE(pid >= 0); 94 95 if (pid == 0) { 96 97 errno = 0; 98 rv = kill(getpid(), -1); 99 100 if (rv == 0 || errno != EINVAL) 101 _exit(EINVAL); 102 103 errno = 0; 104 rv = kill(INT_MAX, SIGUSR1); 105 106 if (rv == 0 || errno != ESRCH) 107 _exit(ESRCH); 108 109 _exit(EXIT_SUCCESS); 110 } 111 112 (void)wait(&sta); 113 114 if (WIFEXITED(sta) == 0 || WEXITSTATUS(sta) != EXIT_SUCCESS) { 115 116 if (WEXITSTATUS(sta) == EINVAL) 117 atf_tc_fail("expected EINVAL, but kill(2) succeeded"); 118 119 if (WEXITSTATUS(sta) == ESRCH) 120 atf_tc_fail("expected ESRCH, but kill(2) succeeded"); 121 122 atf_tc_fail("unknown error from kill(2)"); 123 } 124 } 125 126 ATF_TC(kill_perm); 127 ATF_TC_HEAD(kill_perm, tc) 128 { 129 atf_tc_set_md_var(tc, "descr", "Test kill(2) permissions"); 130 atf_tc_set_md_var(tc, "require.user", "root"); 131 } 132 133 ATF_TC_BODY(kill_perm, tc) 134 { 135 struct passwd *pw; 136 pid_t cpid, ppid; 137 uid_t cuid = 0; 138 uid_t puid = 0; 139 int sta; 140 141 /* 142 * Test that kill(2) fails when called 143 * for a PID owned by another user. 144 */ 145 pw = getpwnam("operator"); 146 147 if (pw != NULL) 148 cuid = pw->pw_uid; 149 150 pw = getpwnam("nobody"); 151 152 if (pw != NULL) 153 puid = pw->pw_uid; 154 155 if (cuid == 0 || puid == 0 || cuid == puid) 156 atf_tc_fail("getpwnam(3) failed"); 157 158 ppid = fork(); 159 160 if (ppid < 0) 161 _exit(EXIT_FAILURE); 162 163 if (ppid == 0) { 164 165 cpid = fork(); 166 167 if (cpid < 0) 168 _exit(EXIT_FAILURE); 169 170 if (cpid == 0) { 171 172 if (setuid(cuid) < 0) 173 _exit(EXIT_FAILURE); 174 else { 175 (void)sleep(1); 176 } 177 178 _exit(EXIT_SUCCESS); 179 } 180 181 /* 182 * Try to kill the child after having 183 * set the real and effective UID. 184 */ 185 if (setuid(puid) != 0) 186 _exit(EXIT_FAILURE); 187 188 errno = 0; 189 190 if (kill(cpid, SIGKILL) == 0) 191 _exit(EPERM); 192 193 if (errno != EPERM) 194 _exit(EPERM); 195 196 (void)waitpid(cpid, &sta, 0); 197 198 _exit(EXIT_SUCCESS); 199 } 200 201 (void)waitpid(ppid, &sta, 0); 202 203 if (WIFEXITED(sta) == 0 || WEXITSTATUS(sta) == EPERM) 204 atf_tc_fail("killed a process of another user"); 205 206 if (WIFEXITED(sta) == 0 || WEXITSTATUS(sta) != EXIT_SUCCESS) 207 atf_tc_fail("unknown error from kill(2)"); 208 } 209 210 ATF_TC(kill_pgrp_neg); 211 ATF_TC_HEAD(kill_pgrp_neg, tc) 212 { 213 atf_tc_set_md_var(tc, "descr", "Test kill(2) with process group, #2"); 214 } 215 216 ATF_TC_BODY(kill_pgrp_neg, tc) 217 { 218 const int maxiter = 3; 219 pid_t cpid, ppid; 220 int i, sta; 221 222 ppid = fork(); 223 ATF_REQUIRE(ppid >= 0); 224 225 if (ppid == 0) { 226 227 ATF_REQUIRE(setpgid(0, 0) == 0); 228 229 for (i = 0; i < maxiter; i++) { 230 231 cpid = fork(); 232 ATF_REQUIRE(cpid >= 0); 233 234 if (cpid == 0) 235 pause(); 236 } 237 238 /* 239 * Test the variant of killpg(3); if the process number 240 * is negative but not -1, the signal should be sent to 241 * all processes whose process group ID is equal to the 242 * absolute value of the process number. 243 */ 244 ATF_REQUIRE(kill(-getpgrp(), SIGKILL) == 0); 245 246 (void)sleep(1); 247 248 _exit(EXIT_SUCCESS); 249 } 250 251 (void)waitpid(ppid, &sta, 0); 252 253 if (WIFSIGNALED(sta) == 0 || WTERMSIG(sta) != SIGKILL) 254 atf_tc_fail("failed to kill(2) a process group"); 255 } 256 257 ATF_TC(kill_pgrp_zero); 258 ATF_TC_HEAD(kill_pgrp_zero, tc) 259 { 260 atf_tc_set_md_var(tc, "descr", "Test kill(2) with process group, #1"); 261 } 262 263 ATF_TC_BODY(kill_pgrp_zero, tc) 264 { 265 const int maxiter = 3; 266 pid_t cpid, ppid; 267 int i, sta; 268 269 ppid = fork(); 270 ATF_REQUIRE(ppid >= 0); 271 272 if (ppid == 0) { 273 274 ATF_REQUIRE(setpgid(0, 0) == 0); 275 276 for (i = 0; i < maxiter; i++) { 277 278 cpid = fork(); 279 ATF_REQUIRE(cpid >= 0); 280 281 if (cpid == 0) 282 pause(); 283 } 284 285 /* 286 * If the supplied process number is zero, 287 * the signal should be sent to all processes 288 * under the current process group. 289 */ 290 ATF_REQUIRE(kill(0, SIGKILL) == 0); 291 292 (void)sleep(1); 293 294 _exit(EXIT_SUCCESS); 295 } 296 297 (void)waitpid(ppid, &sta, 0); 298 299 if (WIFSIGNALED(sta) == 0 || WTERMSIG(sta) != SIGKILL) 300 atf_tc_fail("failed to kill(2) a process group"); 301 } 302 303 ATF_TP_ADD_TCS(tp) 304 { 305 306 ATF_TP_ADD_TC(tp, kill_basic); 307 ATF_TP_ADD_TC(tp, kill_err); 308 ATF_TP_ADD_TC(tp, kill_perm); 309 ATF_TP_ADD_TC(tp, kill_pgrp_neg); 310 ATF_TP_ADD_TC(tp, kill_pgrp_zero); 311 312 return atf_no_error(); 313 } 314