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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