1 /* $OpenBSD: t_sigaltstack.c,v 1.2 2021/12/13 16:56:48 deraadt 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 <signal.h> 32 #include <stdbool.h> 33 34 #include "atf-c.h" 35 36 #include "h_macros.h" 37 38 static stack_t sigstk; 39 static bool handler_called; 40 static bool handler_use_altstack; 41 42 static void 43 handler(int signo __unused) 44 { 45 char sp[128]; 46 47 handler_called = true; 48 49 /* checking if the stack pointer is within the range of altstack */ 50 if ((char *)sigstk.ss_sp <= sp && 51 ((char *)sigstk.ss_sp + sigstk.ss_size) > sp) 52 handler_use_altstack = true; 53 else 54 handler_use_altstack = false; 55 } 56 57 ATF_TC(sigaltstack_onstack); 58 ATF_TC_HEAD(sigaltstack_onstack, tc) 59 { 60 atf_tc_set_md_var(tc, "descr", 61 "Checks for using signal stack with SA_ONSTACK"); 62 } 63 64 ATF_TC_BODY(sigaltstack_onstack, tc) 65 { 66 struct sigaction sa; 67 int i; 68 69 /* set a signal handler use alternative stack */ 70 memset(&sigstk, 0, sizeof(sigstk)); 71 sigstk.ss_sp = malloc(SIGSTKSZ); 72 ATF_REQUIRE(sigstk.ss_sp != NULL); 73 sigstk.ss_size = SIGSTKSZ; 74 sigstk.ss_flags = 0; 75 ATF_REQUIRE(sigaltstack(&sigstk, 0) == 0); 76 77 sigemptyset(&sa.sa_mask); 78 sa.sa_handler = handler; 79 sa.sa_flags = SA_ONSTACK; 80 sigaction(SIGUSR1, &sa, NULL); 81 82 /* test several times */ 83 for (i = 1; i <= 5; i++) { 84 handler_called = false; 85 kill(getpid(), SIGUSR1); 86 87 if (!handler_called) 88 atf_tc_fail("signal handler wasn't called (count=%d)", i); 89 if (!handler_use_altstack) 90 atf_tc_fail("alternative stack wasn't used (count=%d)", i); 91 } 92 } 93 94 ATF_TP_ADD_TCS(tp) 95 { 96 ATF_TP_ADD_TC(tp, sigaltstack_onstack); 97 98 return atf_no_error(); 99 } 100