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 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 } 100 101 ATF_TP_ADD_TCS(tp) 102 { 103 ATF_TP_ADD_TC(tp, main); 104 105 return (atf_no_error()); 106 } 107