1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause
3 *
4 * Copyright (c) 2018 Eric van Gyzen
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
25 * SUCH DAMAGE.
26 */
27
28 #include <sys/cdefs.h>
29 #include <atf-c.h>
30 #include <errno.h>
31 #include <signal.h>
32 #include <stdbool.h>
33 #include <stdlib.h>
34
35 /*
36 * TODO add tests for:
37 *
38 * - all error cases
39 * - SS_DISABLE
40 * - no effect without SA_ONSTACK
41 */
42
43 static sig_atomic_t disabled_correct = 1;
44 static sig_atomic_t level1_correct = -1;
45 static sig_atomic_t level2_correct = -1;
46
47 static void
sig_handler(int signo,siginfo_t * info __unused,void * ucp)48 sig_handler(int signo, siginfo_t *info __unused, void *ucp)
49 {
50 ucontext_t *uc = ucp;
51
52 // The alternate signal stack is enabled.
53 disabled_correct = disabled_correct &&
54 (uc->uc_stack.ss_flags & SS_DISABLE) == 0;
55 if (signo == SIGUSR1) {
56 // The thread was NOT running on the alternate signal
57 // stack when this signal arrived.
58 level1_correct = (uc->uc_stack.ss_flags & SS_ONSTACK) == 0;
59 raise(SIGUSR2);
60 } else {
61 // The thread WAS running on the alternate signal
62 // stack when this signal arrived.
63 level2_correct = (uc->uc_stack.ss_flags & SS_ONSTACK) != 0;
64 }
65 }
66
67 ATF_TC(ss_onstack);
68
ATF_TC_HEAD(ss_onstack,tc)69 ATF_TC_HEAD(ss_onstack, tc)
70 {
71
72 atf_tc_set_md_var(tc, "descr", "Test reporting of SS_ONSTACK");
73 }
74
ATF_TC_BODY(ss_onstack,tc)75 ATF_TC_BODY(ss_onstack, tc)
76 {
77 stack_t ss = {
78 .ss_size = SIGSTKSZ,
79 };
80 stack_t oss = {
81 .ss_size = 0,
82 };
83
84 ss.ss_sp = malloc(ss.ss_size);
85 ATF_REQUIRE(ss.ss_sp != NULL);
86 ATF_REQUIRE(sigaltstack(&ss, &oss) == 0);
87
88 // There should be no signal stack currently configured.
89 ATF_CHECK(oss.ss_sp == NULL);
90 ATF_CHECK(oss.ss_size == 0);
91 ATF_CHECK((oss.ss_flags & SS_DISABLE) != 0);
92 ATF_CHECK((oss.ss_flags & SS_ONSTACK) == 0);
93
94 struct sigaction sa = {
95 .sa_sigaction = sig_handler,
96 .sa_flags = SA_ONSTACK | SA_SIGINFO,
97 };
98 ATF_REQUIRE(sigemptyset(&sa.sa_mask) == 0);
99 ATF_REQUIRE(sigaction(SIGUSR1, &sa, NULL) == 0);
100 ATF_REQUIRE(sigaction(SIGUSR2, &sa, NULL) == 0);
101 ATF_REQUIRE(raise(SIGUSR1) == 0);
102
103 ATF_CHECK(level1_correct != -1);
104 ATF_CHECK(level1_correct == 1);
105 ATF_CHECK(level2_correct != -1);
106 ATF_CHECK(level2_correct == 1);
107 }
108
ATF_TP_ADD_TCS(tp)109 ATF_TP_ADD_TCS(tp)
110 {
111
112 ATF_TP_ADD_TC(tp, ss_onstack);
113
114 return (atf_no_error());
115 }
116