1 /* $NetBSD: t_sigaltstack.c,v 1.2 2020/05/01 21:35:30 christos 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 1.2 2020/05/01 21:35:30 christos 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
handler(int signo __unused)44 handler(int signo __unused)
45 {
46 char sp[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);
ATF_TC_HEAD(sigaltstack_onstack,tc)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
ATF_TC_BODY(sigaltstack_onstack,tc)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
ATF_TP_ADD_TCS(tp)95 ATF_TP_ADD_TCS(tp)
96 {
97 ATF_TP_ADD_TC(tp, sigaltstack_onstack);
98
99 return atf_no_error();
100 }
101