1 /* $OpenBSD: t_kevent.c,v 1.2 2021/12/13 16:56:48 deraadt Exp $ */ 2 /* $NetBSD: t_kevent.c,v 1.9 2020/10/31 01:08:32 christos 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 Foundatiom 9 * by Christos Zoulas. 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 #include "macros.h" 33 34 #include <sys/types.h> 35 #include <sys/event.h> 36 37 #include "atf-c.h" 38 #include <errno.h> 39 #include <time.h> 40 #include <stdio.h> 41 #include <stdlib.h> 42 #include <string.h> 43 #include <unistd.h> 44 #include <fcntl.h> 45 #include <err.h> 46 #ifndef __OpenBSD__ 47 #include <sys/drvctlio.h> 48 #endif 49 #include <sys/event.h> 50 #include <sys/time.h> 51 #include <sys/socket.h> 52 #include <sys/wait.h> 53 54 ATF_TC(kevent_zerotimer); 55 ATF_TC_HEAD(kevent_zerotimer, tc) 56 { 57 atf_tc_set_md_var(tc, "descr", "Checks that kevent with a 0 timer " 58 "does not crash the system (PR lib/45618)"); 59 } 60 61 ATF_TC_BODY(kevent_zerotimer, tc) 62 { 63 struct kevent ev; 64 int kq; 65 66 ATF_REQUIRE((kq = kqueue()) != -1); 67 EV_SET(&ev, 1, EVFILT_TIMER, EV_ADD|EV_ENABLE, 0, 1, 0); 68 ATF_REQUIRE(kevent(kq, &ev, 1, NULL, 0, NULL) != -1); 69 ATF_REQUIRE(kevent(kq, NULL, 0, &ev, 1, NULL) == 1); 70 } 71 72 ATF_TC(kqueue_desc_passing); 73 ATF_TC_HEAD(kqueue_desc_passing, tc) 74 { 75 atf_tc_set_md_var(tc, "descr", "Checks that passing a kqueue to " 76 "another process does not crash the kernel (PR 46463)"); 77 } 78 79 ATF_TC_BODY(kqueue_desc_passing, tc) 80 { 81 pid_t child; 82 int s[2], storage, status, kq; 83 struct cmsghdr *msg; 84 struct iovec iov; 85 struct msghdr m; 86 struct kevent ev; 87 88 ATF_REQUIRE((kq = kqueue()) != -1); 89 90 // atf_tc_skip("crashes kernel (PR kern/46463)"); 91 92 ATF_REQUIRE(socketpair(AF_LOCAL, SOCK_STREAM, 0, s) != -1); 93 msg = malloc(CMSG_SPACE(sizeof(int))); 94 m.msg_iov = &iov; 95 m.msg_iovlen = 1; 96 m.msg_name = NULL; 97 m.msg_namelen = 0; 98 m.msg_control = msg; 99 m.msg_controllen = CMSG_SPACE(sizeof(int)); 100 101 child = fork(); 102 if (child == 0) { 103 #ifdef __OpenBSD__ 104 sleep(1); 105 exit(0); 106 #endif 107 close(s[0]); 108 109 iov.iov_base = &storage; 110 iov.iov_len = sizeof(int); 111 m.msg_iov = &iov; 112 m.msg_iovlen = 1; 113 114 if (recvmsg(s[1], &m, 0) == -1) 115 err(1, "child: could not recvmsg"); 116 117 kq = *(int *)CMSG_DATA(msg); 118 printf("child (pid %d): received kq fd %d\n", getpid(), kq); 119 exit(0); 120 } 121 122 close(s[1]); 123 124 iov.iov_base = &storage; 125 iov.iov_len = sizeof(int); 126 127 msg->cmsg_level = SOL_SOCKET; 128 msg->cmsg_type = SCM_RIGHTS; 129 msg->cmsg_len = CMSG_LEN(sizeof(int)); 130 131 *(int *)CMSG_DATA(msg) = kq; 132 133 EV_SET(&ev, 1, EVFILT_TIMER, EV_ADD|EV_ENABLE, 0, 1, 0); 134 ATF_CHECK(kevent(kq, &ev, 1, NULL, 0, NULL) != -1); 135 136 printf("parent (pid %d): sending kq fd %d\n", getpid(), kq); 137 if (sendmsg(s[0], &m, 0) == -1) { 138 #ifdef __OpenBSD__ 139 ATF_REQUIRE_EQ_MSG(errno, EINVAL, "errno is %d", errno); 140 #else 141 ATF_REQUIRE_EQ_MSG(errno, EBADF, "errno is %d", errno); 142 atf_tc_skip("PR kern/46523"); 143 #endif 144 } 145 146 close(kq); 147 148 waitpid(child, &status, 0); 149 ATF_CHECK(WIFEXITED(status) && WEXITSTATUS(status)==0); 150 } 151 152 #ifndef __OpenBSD__ 153 ATF_TC(kqueue_unsupported_fd); 154 ATF_TC_HEAD(kqueue_unsupported_fd, tc) 155 { 156 atf_tc_set_md_var(tc, "descr", "Checks that watching an fd whose" 157 " type is not supported does not crash the kernel"); 158 } 159 160 ATF_TC_BODY(kqueue_unsupported_fd, tc) 161 { 162 /* mqueue and semaphore use fnullop_kqueue also */ 163 int fd, kq; 164 struct kevent ev; 165 166 fd = open(DRVCTLDEV, O_RDONLY); 167 if (fd == -1) { 168 switch (errno) { 169 case ENOENT: 170 case ENXIO: 171 atf_tc_skip("no " DRVCTLDEV " available for testing"); 172 break; 173 } 174 } 175 ATF_REQUIRE(fd != -1); 176 ATF_REQUIRE((kq = kqueue()) != -1); 177 178 EV_SET(&ev, fd, EVFILT_VNODE, EV_ADD | EV_ENABLE | EV_CLEAR, 179 NOTE_DELETE|NOTE_WRITE|NOTE_EXTEND|NOTE_ATTRIB|NOTE_LINK| 180 NOTE_RENAME|NOTE_REVOKE, 0, 0); 181 182 ATF_REQUIRE(kevent(kq, &ev, 1, NULL, 0, NULL) == -1); 183 ATF_REQUIRE_ERRNO(EOPNOTSUPP, true); 184 185 (void)close(fd); 186 (void)close(kq); 187 } 188 189 ATF_TC(kqueue_EVFILT_USER); 190 ATF_TC_HEAD(kqueue_EVFILT_USER, tc) 191 { 192 atf_tc_set_md_var(tc, "descr", "Checks usability of EVFILT_USER"); 193 } 194 195 ATF_TC_BODY(kqueue_EVFILT_USER, tc) 196 { 197 /* mqueue and semaphore use fnullop_kqueue also */ 198 int kq; 199 struct kevent ev, rev; 200 201 ATF_REQUIRE((kq = kqueue()) != -1); 202 203 EV_SET(&ev, 666, EVFILT_USER, EV_ADD | EV_ENABLE, 0, 0, 0); 204 ATF_REQUIRE(kevent(kq, &ev, 1, NULL, 0, NULL) == 0); 205 EV_SET(&ev, 666, EVFILT_USER, 0, NOTE_FFCOPY | NOTE_TRIGGER | 8, 0, 0); 206 ATF_REQUIRE(kevent(kq, &ev, 1, NULL, 0, NULL) == 0); 207 const struct timespec timeout = { 208 .tv_sec = 1, 209 .tv_nsec = 0, 210 }; 211 212 ATF_REQUIRE(kevent(kq, NULL, 0, &rev, 1, &timeout) == 1); 213 ATF_REQUIRE(rev.ident == 666); 214 ATF_REQUIRE(rev.filter == EVFILT_USER); 215 ATF_REQUIRE(rev.fflags == 8); 216 (void)close(kq); 217 } 218 #endif 219 220 221 222 ATF_TP_ADD_TCS(tp) 223 { 224 225 ATF_TP_ADD_TC(tp, kevent_zerotimer); 226 ATF_TP_ADD_TC(tp, kqueue_desc_passing); 227 #ifndef __OpenBSD__ 228 ATF_TP_ADD_TC(tp, kqueue_unsupported_fd); 229 ATF_TP_ADD_TC(tp, kqueue_EVFILT_USER); 230 #endif 231 232 return atf_no_error(); 233 } 234