101 lines
2.9 KiB
C
101 lines
2.9 KiB
C
/* $NetBSD: t_sigaltstack.c,v 1.2 2020/05/01 21:35:30 christos Exp $ */
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/*-
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* Copyright (c) 2020 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__RCSID("$NetBSD: t_sigaltstack.c,v 1.2 2020/05/01 21:35:30 christos Exp $");
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#include <signal.h>
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#include <stdbool.h>
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#include <atf-c.h>
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#include "h_macros.h"
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static stack_t sigstk;
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static bool handler_called;
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static bool handler_use_altstack;
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static void
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handler(int signo __unused)
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{
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char sp[128];
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handler_called = true;
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/* checking if the stack pointer is within the range of altstack */
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if ((char *)sigstk.ss_sp <= sp &&
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((char *)sigstk.ss_sp + sigstk.ss_size) > sp)
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handler_use_altstack = true;
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else
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handler_use_altstack = false;
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}
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ATF_TC(sigaltstack_onstack);
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ATF_TC_HEAD(sigaltstack_onstack, tc)
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{
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atf_tc_set_md_var(tc, "descr",
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"Checks for using signal stack with SA_ONSTACK");
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}
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ATF_TC_BODY(sigaltstack_onstack, tc)
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{
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struct sigaction sa;
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int i;
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/* set a signal handler use alternative stack */
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memset(&sigstk, 0, sizeof(sigstk));
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sigstk.ss_sp = malloc(SIGSTKSZ);
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ATF_REQUIRE(sigstk.ss_sp != NULL);
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sigstk.ss_size = SIGSTKSZ;
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sigstk.ss_flags = 0;
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ATF_REQUIRE(sigaltstack(&sigstk, 0) == 0);
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sigemptyset(&sa.sa_mask);
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sa.sa_handler = handler;
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sa.sa_flags = SA_ONSTACK;
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sigaction(SIGUSR1, &sa, NULL);
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/* test several times */
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for (i = 1; i <= 5; i++) {
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handler_called = false;
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kill(getpid(), SIGUSR1);
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if (!handler_called)
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atf_tc_fail("signal handler wasn't called (count=%d)", i);
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if (!handler_use_altstack)
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atf_tc_fail("alternative stack wasn't used (count=%d)", i);
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}
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}
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ATF_TP_ADD_TCS(tp)
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{
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ATF_TP_ADD_TC(tp, sigaltstack_onstack);
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return atf_no_error();
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}
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