xref: /freebsd-src/tests/sys/kern/sigaltstack.c (revision 1d386b48a555f61cb7325543adbbb5c3f3407a66)
1984969cdSEric van Gyzen /*-
2984969cdSEric van Gyzen  * SPDX-License-Identifier: BSD-2-Clause
3984969cdSEric van Gyzen  *
4984969cdSEric van Gyzen  * Copyright (c) 2018 Eric van Gyzen
5984969cdSEric van Gyzen  *
6984969cdSEric van Gyzen  * Redistribution and use in source and binary forms, with or without
7984969cdSEric van Gyzen  * modification, are permitted provided that the following conditions
8984969cdSEric van Gyzen  * are met:
9984969cdSEric van Gyzen  * 1. Redistributions of source code must retain the above copyright
10984969cdSEric van Gyzen  *    notice, this list of conditions and the following disclaimer.
11984969cdSEric van Gyzen  * 2. Redistributions in binary form must reproduce the above copyright
12984969cdSEric van Gyzen  *    notice, this list of conditions and the following disclaimer in the
13984969cdSEric van Gyzen  *    documentation and/or other materials provided with the distribution.
14984969cdSEric van Gyzen  *
15984969cdSEric van Gyzen  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
16984969cdSEric van Gyzen  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17984969cdSEric van Gyzen  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18984969cdSEric van Gyzen  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
19984969cdSEric van Gyzen  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20984969cdSEric van Gyzen  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
21984969cdSEric van Gyzen  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22984969cdSEric van Gyzen  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23984969cdSEric van Gyzen  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24984969cdSEric van Gyzen  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
25984969cdSEric van Gyzen  * SUCH DAMAGE.
26984969cdSEric van Gyzen  */
27984969cdSEric van Gyzen 
28984969cdSEric van Gyzen #include <sys/cdefs.h>
29984969cdSEric van Gyzen #include <atf-c.h>
30984969cdSEric van Gyzen #include <errno.h>
31984969cdSEric van Gyzen #include <signal.h>
32984969cdSEric van Gyzen #include <stdbool.h>
33984969cdSEric van Gyzen #include <stdlib.h>
34984969cdSEric van Gyzen 
35984969cdSEric van Gyzen /*
36984969cdSEric van Gyzen  * TODO add tests for:
37984969cdSEric van Gyzen  *
38984969cdSEric van Gyzen  * - all error cases
39984969cdSEric van Gyzen  * - SS_DISABLE
40984969cdSEric van Gyzen  * - no effect without SA_ONSTACK
41984969cdSEric van Gyzen  */
42984969cdSEric van Gyzen 
43984969cdSEric van Gyzen static sig_atomic_t disabled_correct = 1;
44984969cdSEric van Gyzen static sig_atomic_t level1_correct = -1;
45984969cdSEric van Gyzen static sig_atomic_t level2_correct = -1;
46984969cdSEric van Gyzen 
47984969cdSEric van Gyzen static void
sig_handler(int signo,siginfo_t * info __unused,void * ucp)48984969cdSEric van Gyzen sig_handler(int signo, siginfo_t *info __unused, void *ucp)
49984969cdSEric van Gyzen {
50984969cdSEric van Gyzen 	ucontext_t *uc = ucp;
51984969cdSEric van Gyzen 
52984969cdSEric van Gyzen 	// The alternate signal stack is enabled.
53984969cdSEric van Gyzen 	disabled_correct = disabled_correct &&
54984969cdSEric van Gyzen 	    (uc->uc_stack.ss_flags & SS_DISABLE) == 0;
55984969cdSEric van Gyzen 	if (signo == SIGUSR1) {
56984969cdSEric van Gyzen 		// The thread was NOT running on the alternate signal
57984969cdSEric van Gyzen 		// stack when this signal arrived.
58984969cdSEric van Gyzen 		level1_correct = (uc->uc_stack.ss_flags & SS_ONSTACK) == 0;
59984969cdSEric van Gyzen 		raise(SIGUSR2);
60984969cdSEric van Gyzen 	} else {
61984969cdSEric van Gyzen 		// The thread WAS running on the alternate signal
62984969cdSEric van Gyzen 		// stack when this signal arrived.
63984969cdSEric van Gyzen 		level2_correct = (uc->uc_stack.ss_flags & SS_ONSTACK) != 0;
64984969cdSEric van Gyzen 	}
65984969cdSEric van Gyzen }
66984969cdSEric van Gyzen 
67984969cdSEric van Gyzen ATF_TC(ss_onstack);
68984969cdSEric van Gyzen 
ATF_TC_HEAD(ss_onstack,tc)69984969cdSEric van Gyzen ATF_TC_HEAD(ss_onstack, tc)
70984969cdSEric van Gyzen {
71984969cdSEric van Gyzen 
72984969cdSEric van Gyzen 	atf_tc_set_md_var(tc, "descr", "Test reporting of SS_ONSTACK");
73984969cdSEric van Gyzen }
74984969cdSEric van Gyzen 
ATF_TC_BODY(ss_onstack,tc)75984969cdSEric van Gyzen ATF_TC_BODY(ss_onstack, tc)
76984969cdSEric van Gyzen {
77984969cdSEric van Gyzen 	stack_t ss = {
78984969cdSEric van Gyzen 		.ss_size = SIGSTKSZ,
79984969cdSEric van Gyzen 	};
80*de7417c4SEric van Gyzen 	stack_t oss = {
81*de7417c4SEric van Gyzen 		.ss_size = 0,
82*de7417c4SEric van Gyzen 	};
83984969cdSEric van Gyzen 
84984969cdSEric van Gyzen 	ss.ss_sp = malloc(ss.ss_size);
85984969cdSEric van Gyzen 	ATF_REQUIRE(ss.ss_sp != NULL);
86984969cdSEric van Gyzen 	ATF_REQUIRE(sigaltstack(&ss, &oss) == 0);
87984969cdSEric van Gyzen 
88984969cdSEric van Gyzen 	// There should be no signal stack currently configured.
89984969cdSEric van Gyzen 	ATF_CHECK(oss.ss_sp == NULL);
90984969cdSEric van Gyzen 	ATF_CHECK(oss.ss_size == 0);
91984969cdSEric van Gyzen 	ATF_CHECK((oss.ss_flags & SS_DISABLE) != 0);
92984969cdSEric van Gyzen 	ATF_CHECK((oss.ss_flags & SS_ONSTACK) == 0);
93984969cdSEric van Gyzen 
94984969cdSEric van Gyzen 	struct sigaction sa = {
95984969cdSEric van Gyzen 		.sa_sigaction = sig_handler,
96984969cdSEric van Gyzen 		.sa_flags = SA_ONSTACK | SA_SIGINFO,
97984969cdSEric van Gyzen 	};
98984969cdSEric van Gyzen 	ATF_REQUIRE(sigemptyset(&sa.sa_mask) == 0);
99984969cdSEric van Gyzen 	ATF_REQUIRE(sigaction(SIGUSR1, &sa, NULL) == 0);
100984969cdSEric van Gyzen 	ATF_REQUIRE(sigaction(SIGUSR2, &sa, NULL) == 0);
101984969cdSEric van Gyzen 	ATF_REQUIRE(raise(SIGUSR1) == 0);
102984969cdSEric van Gyzen 
103984969cdSEric van Gyzen 	ATF_CHECK(level1_correct != -1);
104984969cdSEric van Gyzen 	ATF_CHECK(level1_correct == 1);
105984969cdSEric van Gyzen 	ATF_CHECK(level2_correct != -1);
106984969cdSEric van Gyzen 	ATF_CHECK(level2_correct == 1);
107984969cdSEric van Gyzen }
108984969cdSEric van Gyzen 
ATF_TP_ADD_TCS(tp)109984969cdSEric van Gyzen ATF_TP_ADD_TCS(tp)
110984969cdSEric van Gyzen {
111984969cdSEric van Gyzen 
112984969cdSEric van Gyzen 	ATF_TP_ADD_TC(tp, ss_onstack);
113984969cdSEric van Gyzen 
114984969cdSEric van Gyzen 	return (atf_no_error());
115984969cdSEric van Gyzen }
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