t_kevent.c revision 314817 
1/*	$NetBSD: t_kevent.c,v 1.7 2015/02/05 13:55:37 isaki 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 Foundatiom
8 * by Christos Zoulas.
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_kevent.c,v 1.7 2015/02/05 13:55:37 isaki Exp $");
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#ifdef __NetBSD__
47#include <sys/drvctlio.h>
48#else
49#define	DRVCTLDEV "/nonexistent"
50#endif
51#include <sys/event.h>
52#include <sys/time.h>
53#include <sys/socket.h>
54#include <sys/wait.h>
55
56ATF_TC(kevent_zerotimer);
57ATF_TC_HEAD(kevent_zerotimer, tc)
58{
59	atf_tc_set_md_var(tc, "descr", "Checks that kevent with a 0 timer "
60	    "does not crash the system (PR lib/45618)");
61}
62
63ATF_TC_BODY(kevent_zerotimer, tc)
64{
65	struct kevent ev;
66	int kq;
67
68	ATF_REQUIRE((kq = kqueue()) != -1);
69	EV_SET(&ev, 1, EVFILT_TIMER, EV_ADD|EV_ENABLE, 0, 1, 0);
70	ATF_REQUIRE(kevent(kq, &ev, 1, NULL, 0, NULL) != -1);
71	ATF_REQUIRE(kevent(kq, NULL, 0, &ev, 1, NULL) == 1);
72}
73
74ATF_TC(kqueue_desc_passing);
75ATF_TC_HEAD(kqueue_desc_passing, tc)
76{
77	atf_tc_set_md_var(tc, "descr", "Checks that passing a kqueue to "
78		"another process does not crash the kernel (PR 46463)");
79}
80
81ATF_TC_BODY(kqueue_desc_passing, tc)
82{
83	pid_t child;
84	int s[2], storage, status, kq;
85	struct cmsghdr *msg;
86	struct iovec iov;
87	struct msghdr m;
88	struct kevent ev;
89
90	ATF_REQUIRE((kq = kqueue()) != -1);
91
92	// atf_tc_skip("crashes kernel (PR 46463)");
93
94	ATF_REQUIRE(socketpair(AF_LOCAL, SOCK_STREAM, 0, s) != -1);
95	msg = malloc(CMSG_SPACE(sizeof(int)));
96	m.msg_iov = &iov;
97	m.msg_iovlen = 1;
98	m.msg_name = NULL;
99	m.msg_namelen = 0;
100	m.msg_control = msg;
101	m.msg_controllen = CMSG_SPACE(sizeof(int));
102#ifdef __FreeBSD__
103	m.msg_flags = 0;
104#endif
105
106	child = fork();
107	if (child == 0) {
108		close(s[0]);
109
110		iov.iov_base = &storage;
111		iov.iov_len = sizeof(int);
112		m.msg_iov = &iov;
113		m.msg_iovlen = 1;
114
115		if (recvmsg(s[1], &m, 0) == -1)
116			err(1, "child: could not recvmsg");
117
118		kq = *(int *)CMSG_DATA(msg);
119		printf("child (pid %d): received kq fd %d\n", getpid(), kq);
120		exit(0);
121	}
122
123	close(s[1]);
124
125	iov.iov_base = &storage;
126	iov.iov_len = sizeof(int);
127
128#ifdef __FreeBSD__
129	msg = CMSG_FIRSTHDR(&m);
130#endif
131	msg->cmsg_level = SOL_SOCKET;
132	msg->cmsg_type = SCM_RIGHTS;
133	msg->cmsg_len = CMSG_LEN(sizeof(int));
134
135#ifdef __NetBSD__
136	*(int *)CMSG_DATA(msg) = kq;
137#endif
138
139	EV_SET(&ev, 1, EVFILT_TIMER, EV_ADD|EV_ENABLE, 0, 1, 0);
140	ATF_CHECK(kevent(kq, &ev, 1, NULL, 0, NULL) != -1);
141
142	printf("parent (pid %d): sending kq fd %d\n", getpid(), kq);
143	if (sendmsg(s[0], &m, 0) == -1) {
144		ATF_REQUIRE_EQ_MSG(errno, EBADF, "errno is %d", errno);
145		atf_tc_skip("PR kern/46523");
146	}
147
148	close(kq);
149
150	waitpid(child, &status, 0);
151	ATF_CHECK(WIFEXITED(status) && WEXITSTATUS(status)==0);
152}
153
154ATF_TC(kqueue_unsupported_fd);
155ATF_TC_HEAD(kqueue_unsupported_fd, tc)
156{
157	atf_tc_set_md_var(tc, "descr", "Checks that watching an fd whose"
158	    " type is not supported does not crash the kernel");
159}
160
161ATF_TC_BODY(kqueue_unsupported_fd, tc)
162{
163	/* mqueue and semaphore use fnullop_kqueue also */
164	int fd, kq;
165	struct kevent ev;
166
167	fd = open(DRVCTLDEV, O_RDONLY);
168	if (fd == -1) {
169		switch (errno) {
170		case ENOENT:
171		case ENXIO:
172			atf_tc_skip("no " DRVCTLDEV " available for testing");
173			break;
174		}
175	}
176	ATF_REQUIRE(fd != -1);
177	ATF_REQUIRE((kq = kqueue()) != -1);
178
179	EV_SET(&ev, fd, EVFILT_VNODE, EV_ADD | EV_ENABLE | EV_CLEAR,
180	   NOTE_DELETE|NOTE_WRITE|NOTE_EXTEND|NOTE_ATTRIB|NOTE_LINK|
181	   NOTE_RENAME|NOTE_REVOKE, 0, 0);
182
183	ATF_REQUIRE(kevent(kq, &ev, 1, NULL, 0, NULL) == -1);
184	ATF_REQUIRE_ERRNO(EOPNOTSUPP, true);
185
186	(void)close(fd);
187}
188
189
190ATF_TP_ADD_TCS(tp)
191{
192
193	ATF_TP_ADD_TC(tp, kevent_zerotimer);
194	ATF_TP_ADD_TC(tp, kqueue_desc_passing);
195	ATF_TP_ADD_TC(tp, kqueue_unsupported_fd);
196
197	return atf_no_error();
198}
199