1 /* $NetBSD: t_sigaltstack.c,v 1.1 2020/04/30 11:03:29 ryo Exp $ */ 2 3 /*- 4 * Copyright (c) 2020 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 17 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 18 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 19 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 20 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 21 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 22 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 23 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 24 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 25 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 26 * POSSIBILITY OF SUCH DAMAGE. 27 */ 28 29 #include <sys/cdefs.h> 30 __RCSID("$NetBSD: t_sigaltstack.c,v 1.1 2020/04/30 11:03:29 ryo Exp $"); 31 32 #include <signal.h> 33 #include <stdbool.h> 34 35 #include <atf-c.h> 36 37 #include "h_macros.h" 38 39 static stack_t sigstk; 40 static bool handler_called; 41 static bool handler_use_altstack; 42 43 static void 44 handler(int signo __unused) 45 { 46 char *sp = alloca(128); 47 48 handler_called = true; 49 50 /* checking if the stack pointer is within the range of altstack */ 51 if ((char *)sigstk.ss_sp <= sp && 52 ((char *)sigstk.ss_sp + sigstk.ss_size) > sp) 53 handler_use_altstack = true; 54 else 55 handler_use_altstack = false; 56 } 57 58 ATF_TC(sigaltstack_onstack); 59 ATF_TC_HEAD(sigaltstack_onstack, tc) 60 { 61 atf_tc_set_md_var(tc, "descr", 62 "Checks for using signal stack with SA_ONSTACK"); 63 } 64 65 ATF_TC_BODY(sigaltstack_onstack, tc) 66 { 67 struct sigaction sa; 68 int i; 69 70 /* set a signal handler use alternative stack */ 71 memset(&sigstk, 0, sizeof(sigstk)); 72 sigstk.ss_sp = malloc(SIGSTKSZ); 73 ATF_REQUIRE(sigstk.ss_sp != NULL); 74 sigstk.ss_size = SIGSTKSZ; 75 sigstk.ss_flags = 0; 76 ATF_REQUIRE(sigaltstack(&sigstk, 0) == 0); 77 78 sigemptyset(&sa.sa_mask); 79 sa.sa_handler = handler; 80 sa.sa_flags = SA_ONSTACK; 81 sigaction(SIGUSR1, &sa, NULL); 82 83 /* test several times */ 84 for (i = 1; i <= 5; i++) { 85 handler_called = false; 86 kill(getpid(), SIGUSR1); 87 88 if (!handler_called) 89 atf_tc_fail("signal handler wasn't called (count=%d)", i); 90 if (!handler_use_altstack) 91 atf_tc_fail("alternative stack wasn't used (count=%d)", i); 92 } 93 } 94 95 ATF_TP_ADD_TCS(tp) 96 { 97 ATF_TP_ADD_TC(tp, sigaltstack_onstack); 98 99 return atf_no_error(); 100 } 101