1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause
3 *
4 * Copyright 2021 Jan Kokemüller
5 * Copyright 2021 Alex Richardson <arichardson@FreeBSD.org>
6 *
7 * This work was supported by Innovate UK project 105694, "Digital Security by
8 * Design (DSbD) Technology Platform Prototype".
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 AUTHOR AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 */
31 #include <sys/cdefs.h>
32 #include <sys/event.h>
33
34 #include <atf-c.h>
35 #include <errno.h>
36 #include <signal.h>
37
38 ATF_TC_WITHOUT_HEAD(main);
39
ATF_TC_BODY(main,tc)40 ATF_TC_BODY(main, tc)
41 {
42 int rv;
43
44 sigset_t set;
45 rv = sigemptyset(&set);
46 ATF_REQUIRE_EQ(0, rv);
47 rv = sigaddset(&set, SIGUSR1);
48 ATF_REQUIRE_EQ(0, rv);
49 rv = sigprocmask(SIG_BLOCK, &set, NULL);
50 ATF_REQUIRE_EQ(0, rv);
51
52 int skq = kqueue();
53 ATF_REQUIRE(skq >= 0);
54
55 struct kevent kev;
56 EV_SET(&kev, SIGUSR1, EVFILT_SIGNAL, EV_ADD, 0, 0, 0);
57 rv = kevent(skq, &kev, 1, NULL, 0, NULL);
58 ATF_REQUIRE_EQ(0, rv);
59
60 int kq = kqueue();
61 ATF_REQUIRE(kq >= 0);
62
63 EV_SET(&kev, skq, EVFILT_READ, EV_ADD | EV_CLEAR, 0, 0, 0);
64 rv = kevent(kq, &kev, 1, NULL, 0, NULL);
65 ATF_REQUIRE_EQ(0, rv);
66
67 /*
68 * It was previously not guaranteed that sending a signal to self would
69 * be immediately visible in the nested kqueue activation with a zero
70 * timeout. As of https://reviews.freebsd.org/D31858, the kqueue task
71 * queue will be processed in this case, so we are guaranteed to see the
72 * SIGUSR1 here even with a zero timeout. We run the code below in a
73 * loop to make it more likely that older kernels without the fix fail
74 * this test.
75 */
76 for (int i = 0; i < 100; i++) {
77 rv = kill(getpid(), SIGUSR1);
78 ATF_REQUIRE_EQ(0, rv);
79
80 rv = kevent(kq, NULL, 0, &kev, 1, &(struct timespec) { 0, 0 });
81 ATF_REQUIRE_EQ_MSG(1, rv,
82 "Unexpected result %d from kevent() after %d iterations",
83 rv, i);
84 rv = kevent(kq, NULL, 0, &kev, 1, &(struct timespec) { 0, 0 });
85 ATF_REQUIRE_EQ(0, rv);
86
87 rv = kevent(skq, NULL, 0, &kev, 1, &(struct timespec) { 0, 0 });
88 ATF_REQUIRE_EQ(1, rv);
89 rv = kevent(skq, NULL, 0, &kev, 1, &(struct timespec) { 0, 0 });
90 ATF_REQUIRE_EQ(0, rv);
91
92 siginfo_t siginfo;
93 rv = sigtimedwait(&set, &siginfo, &(struct timespec) { 0, 0 });
94 ATF_REQUIRE_EQ(SIGUSR1, rv);
95
96 rv = sigtimedwait(&set, &siginfo, &(struct timespec) { 0, 0 });
97 ATF_REQUIRE_ERRNO(EAGAIN, rv < 0);
98 }
99 }
100
ATF_TP_ADD_TCS(tp)101 ATF_TP_ADD_TCS(tp)
102 {
103 ATF_TP_ADD_TC(tp, main);
104
105 return (atf_no_error());
106 }
107