1 /* $OpenBSD: t_sigaltstack.c,v 1.1 2021/09/02 12:40:44 mbuhl Exp $ */ 2 /* $NetBSD: t_sigaltstack.c,v 1.2 2020/05/01 21:35:30 christos Exp $ */ 3 4 /*- 5 * Copyright (c) 2020 The NetBSD Foundation, Inc. 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 18 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 19 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 20 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 21 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 22 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 23 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 24 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 25 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 26 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 27 * POSSIBILITY OF SUCH DAMAGE. 28 */ 29 #include "macros.h" 30 31 #include <sys/cdefs.h> 32 __RCSID("$NetBSD: t_sigaltstack.c,v 1.2 2020/05/01 21:35:30 christos Exp $"); 33 34 #include <signal.h> 35 #include <stdbool.h> 36 37 #include "atf-c.h" 38 39 #include "h_macros.h" 40 41 static stack_t sigstk; 42 static bool handler_called; 43 static bool handler_use_altstack; 44 45 static void 46 handler(int signo __unused) 47 { 48 char sp[128]; 49 50 handler_called = true; 51 52 /* checking if the stack pointer is within the range of altstack */ 53 if ((char *)sigstk.ss_sp <= sp && 54 ((char *)sigstk.ss_sp + sigstk.ss_size) > sp) 55 handler_use_altstack = true; 56 else 57 handler_use_altstack = false; 58 } 59 60 ATF_TC(sigaltstack_onstack); 61 ATF_TC_HEAD(sigaltstack_onstack, tc) 62 { 63 atf_tc_set_md_var(tc, "descr", 64 "Checks for using signal stack with SA_ONSTACK"); 65 } 66 67 ATF_TC_BODY(sigaltstack_onstack, tc) 68 { 69 struct sigaction sa; 70 int i; 71 72 /* set a signal handler use alternative stack */ 73 memset(&sigstk, 0, sizeof(sigstk)); 74 sigstk.ss_sp = malloc(SIGSTKSZ); 75 ATF_REQUIRE(sigstk.ss_sp != NULL); 76 sigstk.ss_size = SIGSTKSZ; 77 sigstk.ss_flags = 0; 78 ATF_REQUIRE(sigaltstack(&sigstk, 0) == 0); 79 80 sigemptyset(&sa.sa_mask); 81 sa.sa_handler = handler; 82 sa.sa_flags = SA_ONSTACK; 83 sigaction(SIGUSR1, &sa, NULL); 84 85 /* test several times */ 86 for (i = 1; i <= 5; i++) { 87 handler_called = false; 88 kill(getpid(), SIGUSR1); 89 90 if (!handler_called) 91 atf_tc_fail("signal handler wasn't called (count=%d)", i); 92 if (!handler_use_altstack) 93 atf_tc_fail("alternative stack wasn't used (count=%d)", i); 94 } 95 } 96 97 ATF_TP_ADD_TCS(tp) 98 { 99 ATF_TP_ADD_TC(tp, sigaltstack_onstack); 100 101 return atf_no_error(); 102 } 103