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/* $OpenBSD: t_sigaltstack.c,v 1.2 2021/12/13 16:56:48 deraadt Exp $ */
/* $NetBSD: t_sigaltstack.c,v 1.2 2020/05/01 21:35:30 christos Exp $ */
/*-
* Copyright (c) 2020 The NetBSD Foundation, Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include "macros.h"
#include <signal.h>
#include <stdbool.h>
#include "atf-c.h"
#include "h_macros.h"
static stack_t sigstk;
static bool handler_called;
static bool handler_use_altstack;
static void
handler(int signo __unused)
{
char sp[128];
handler_called = true;
/* checking if the stack pointer is within the range of altstack */
if ((char *)sigstk.ss_sp <= sp &&
((char *)sigstk.ss_sp + sigstk.ss_size) > sp)
handler_use_altstack = true;
else
handler_use_altstack = false;
}
ATF_TC(sigaltstack_onstack);
ATF_TC_HEAD(sigaltstack_onstack, tc)
{
atf_tc_set_md_var(tc, "descr",
"Checks for using signal stack with SA_ONSTACK");
}
ATF_TC_BODY(sigaltstack_onstack, tc)
{
struct sigaction sa;
int i;
/* set a signal handler use alternative stack */
memset(&sigstk, 0, sizeof(sigstk));
sigstk.ss_sp = malloc(SIGSTKSZ);
ATF_REQUIRE(sigstk.ss_sp != NULL);
sigstk.ss_size = SIGSTKSZ;
sigstk.ss_flags = 0;
ATF_REQUIRE(sigaltstack(&sigstk, 0) == 0);
sigemptyset(&sa.sa_mask);
sa.sa_handler = handler;
sa.sa_flags = SA_ONSTACK;
sigaction(SIGUSR1, &sa, NULL);
/* test several times */
for (i = 1; i <= 5; i++) {
handler_called = false;
kill(getpid(), SIGUSR1);
if (!handler_called)
atf_tc_fail("signal handler wasn't called (count=%d)", i);
if (!handler_use_altstack)
atf_tc_fail("alternative stack wasn't used (count=%d)", i);
}
}
ATF_TP_ADD_TCS(tp)
{
ATF_TP_ADD_TC(tp, sigaltstack_onstack);
return atf_no_error();
}
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