1 /* $OpenBSD: t_kevent.c,v 1.3 2023/04/19 12:58:15 jsg 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/time.h>
50 #include <sys/socket.h>
51 #include <sys/wait.h>
52
53 ATF_TC(kevent_zerotimer);
ATF_TC_HEAD(kevent_zerotimer,tc)54 ATF_TC_HEAD(kevent_zerotimer, tc)
55 {
56 atf_tc_set_md_var(tc, "descr", "Checks that kevent with a 0 timer "
57 "does not crash the system (PR lib/45618)");
58 }
59
ATF_TC_BODY(kevent_zerotimer,tc)60 ATF_TC_BODY(kevent_zerotimer, tc)
61 {
62 struct kevent ev;
63 int kq;
64
65 ATF_REQUIRE((kq = kqueue()) != -1);
66 EV_SET(&ev, 1, EVFILT_TIMER, EV_ADD|EV_ENABLE, 0, 1, 0);
67 ATF_REQUIRE(kevent(kq, &ev, 1, NULL, 0, NULL) != -1);
68 ATF_REQUIRE(kevent(kq, NULL, 0, &ev, 1, NULL) == 1);
69 }
70
71 ATF_TC(kqueue_desc_passing);
ATF_TC_HEAD(kqueue_desc_passing,tc)72 ATF_TC_HEAD(kqueue_desc_passing, tc)
73 {
74 atf_tc_set_md_var(tc, "descr", "Checks that passing a kqueue to "
75 "another process does not crash the kernel (PR 46463)");
76 }
77
ATF_TC_BODY(kqueue_desc_passing,tc)78 ATF_TC_BODY(kqueue_desc_passing, tc)
79 {
80 pid_t child;
81 int s[2], storage, status, kq;
82 struct cmsghdr *msg;
83 struct iovec iov;
84 struct msghdr m;
85 struct kevent ev;
86
87 ATF_REQUIRE((kq = kqueue()) != -1);
88
89 // atf_tc_skip("crashes kernel (PR kern/46463)");
90
91 ATF_REQUIRE(socketpair(AF_LOCAL, SOCK_STREAM, 0, s) != -1);
92 msg = malloc(CMSG_SPACE(sizeof(int)));
93 m.msg_iov = &iov;
94 m.msg_iovlen = 1;
95 m.msg_name = NULL;
96 m.msg_namelen = 0;
97 m.msg_control = msg;
98 m.msg_controllen = CMSG_SPACE(sizeof(int));
99
100 child = fork();
101 if (child == 0) {
102 #ifdef __OpenBSD__
103 sleep(1);
104 exit(0);
105 #endif
106 close(s[0]);
107
108 iov.iov_base = &storage;
109 iov.iov_len = sizeof(int);
110 m.msg_iov = &iov;
111 m.msg_iovlen = 1;
112
113 if (recvmsg(s[1], &m, 0) == -1)
114 err(1, "child: could not recvmsg");
115
116 kq = *(int *)CMSG_DATA(msg);
117 printf("child (pid %d): received kq fd %d\n", getpid(), kq);
118 exit(0);
119 }
120
121 close(s[1]);
122
123 iov.iov_base = &storage;
124 iov.iov_len = sizeof(int);
125
126 msg->cmsg_level = SOL_SOCKET;
127 msg->cmsg_type = SCM_RIGHTS;
128 msg->cmsg_len = CMSG_LEN(sizeof(int));
129
130 *(int *)CMSG_DATA(msg) = kq;
131
132 EV_SET(&ev, 1, EVFILT_TIMER, EV_ADD|EV_ENABLE, 0, 1, 0);
133 ATF_CHECK(kevent(kq, &ev, 1, NULL, 0, NULL) != -1);
134
135 printf("parent (pid %d): sending kq fd %d\n", getpid(), kq);
136 if (sendmsg(s[0], &m, 0) == -1) {
137 #ifdef __OpenBSD__
138 ATF_REQUIRE_EQ_MSG(errno, EINVAL, "errno is %d", errno);
139 #else
140 ATF_REQUIRE_EQ_MSG(errno, EBADF, "errno is %d", errno);
141 atf_tc_skip("PR kern/46523");
142 #endif
143 }
144
145 close(kq);
146
147 waitpid(child, &status, 0);
148 ATF_CHECK(WIFEXITED(status) && WEXITSTATUS(status)==0);
149 }
150
151 #ifndef __OpenBSD__
152 ATF_TC(kqueue_unsupported_fd);
ATF_TC_HEAD(kqueue_unsupported_fd,tc)153 ATF_TC_HEAD(kqueue_unsupported_fd, tc)
154 {
155 atf_tc_set_md_var(tc, "descr", "Checks that watching an fd whose"
156 " type is not supported does not crash the kernel");
157 }
158
ATF_TC_BODY(kqueue_unsupported_fd,tc)159 ATF_TC_BODY(kqueue_unsupported_fd, tc)
160 {
161 /* mqueue and semaphore use fnullop_kqueue also */
162 int fd, kq;
163 struct kevent ev;
164
165 fd = open(DRVCTLDEV, O_RDONLY);
166 if (fd == -1) {
167 switch (errno) {
168 case ENOENT:
169 case ENXIO:
170 atf_tc_skip("no " DRVCTLDEV " available for testing");
171 break;
172 }
173 }
174 ATF_REQUIRE(fd != -1);
175 ATF_REQUIRE((kq = kqueue()) != -1);
176
177 EV_SET(&ev, fd, EVFILT_VNODE, EV_ADD | EV_ENABLE | EV_CLEAR,
178 NOTE_DELETE|NOTE_WRITE|NOTE_EXTEND|NOTE_ATTRIB|NOTE_LINK|
179 NOTE_RENAME|NOTE_REVOKE, 0, 0);
180
181 ATF_REQUIRE(kevent(kq, &ev, 1, NULL, 0, NULL) == -1);
182 ATF_REQUIRE_ERRNO(EOPNOTSUPP, true);
183
184 (void)close(fd);
185 (void)close(kq);
186 }
187
188 ATF_TC(kqueue_EVFILT_USER);
ATF_TC_HEAD(kqueue_EVFILT_USER,tc)189 ATF_TC_HEAD(kqueue_EVFILT_USER, tc)
190 {
191 atf_tc_set_md_var(tc, "descr", "Checks usability of EVFILT_USER");
192 }
193
ATF_TC_BODY(kqueue_EVFILT_USER,tc)194 ATF_TC_BODY(kqueue_EVFILT_USER, tc)
195 {
196 /* mqueue and semaphore use fnullop_kqueue also */
197 int kq;
198 struct kevent ev, rev;
199
200 ATF_REQUIRE((kq = kqueue()) != -1);
201
202 EV_SET(&ev, 666, EVFILT_USER, EV_ADD | EV_ENABLE, 0, 0, 0);
203 ATF_REQUIRE(kevent(kq, &ev, 1, NULL, 0, NULL) == 0);
204 EV_SET(&ev, 666, EVFILT_USER, 0, NOTE_FFCOPY | NOTE_TRIGGER | 8, 0, 0);
205 ATF_REQUIRE(kevent(kq, &ev, 1, NULL, 0, NULL) == 0);
206 const struct timespec timeout = {
207 .tv_sec = 1,
208 .tv_nsec = 0,
209 };
210
211 ATF_REQUIRE(kevent(kq, NULL, 0, &rev, 1, &timeout) == 1);
212 ATF_REQUIRE(rev.ident == 666);
213 ATF_REQUIRE(rev.filter == EVFILT_USER);
214 ATF_REQUIRE(rev.fflags == 8);
215 (void)close(kq);
216 }
217 #endif
218
219
220
ATF_TP_ADD_TCS(tp)221 ATF_TP_ADD_TCS(tp)
222 {
223
224 ATF_TP_ADD_TC(tp, kevent_zerotimer);
225 ATF_TP_ADD_TC(tp, kqueue_desc_passing);
226 #ifndef __OpenBSD__
227 ATF_TP_ADD_TC(tp, kqueue_unsupported_fd);
228 ATF_TP_ADD_TC(tp, kqueue_EVFILT_USER);
229 #endif
230
231 return atf_no_error();
232 }
233