1 /*
2 * Check decoding of signal syscall.
3 *
4 * Copyright (c) 2017 Dmitry V. Levin <ldv@altlinux.org>
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 * 3. The name of the author may not be used to endorse or promote products
16 * derived from this software without specific prior written permission.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
19 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
20 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
21 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
22 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
23 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
24 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
25 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
26 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
27 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28 */
29
30 #include "tests.h"
31 #include <asm/unistd.h>
32
33 #ifdef __NR_signal
34
35 # include <errno.h>
36 # include <signal.h>
37 # include <stdio.h>
38 # include <stdint.h>
39 # include <string.h>
40 # include <unistd.h>
41
42 static long
k_signal(const kernel_ulong_t signum,const kernel_ulong_t handler)43 k_signal(const kernel_ulong_t signum, const kernel_ulong_t handler)
44 {
45 return syscall(__NR_signal, signum, handler);
46 }
47
48 int
main(void)49 main(void)
50 {
51 static const uintptr_t sig_ign = (uintptr_t) SIG_IGN;
52 static const uintptr_t sig_dfl = (uintptr_t) SIG_DFL;
53 static const kernel_ulong_t sigusr1 =
54 (kernel_ulong_t) 0xfacefeed00000000ULL | SIGUSR1;
55 static const struct sigaction act = { .sa_handler = SIG_DFL };
56 long rc;
57
58 sigset_t mask;
59 sigemptyset(&mask);
60 sigaddset(&mask, SIGUSR1);
61 if (sigprocmask(SIG_BLOCK, &mask, NULL))
62 perror_msg_and_fail("sigprocmask SIG_BLOCK");
63
64 if (sigaction(SIGUSR1, &act, NULL))
65 perror_msg_and_fail("sigaction");
66
67 rc = k_signal(sigusr1, sig_ign);
68
69 if (rc == -1L) {
70 printf("signal(SIGUSR1, SIG_IGN) = %s\n", sprintrc(rc));
71 } else if (rc != (long) sig_dfl) {
72 error_msg_and_fail("signal(SIGUSR1, SIG_IGN) = %#lx\n", rc);
73 } else {
74 printf("signal(SIGUSR1, SIG_IGN) = %#lx (SIG_DFL)\n", rc);
75
76 /*
77 * Raise and unblock SIGUSR1.
78 * If signal syscall failed to set SIGUSR1 handler to SIG_IGN,
79 * the process will be terminated by SIGUSR1.
80 */
81 raise(SIGUSR1);
82 if (sigprocmask(SIG_UNBLOCK, &mask, NULL))
83 perror_msg_and_fail("sigprocmask SIG_UNBLOCK");
84
85 if (sigprocmask(SIG_BLOCK, &mask, NULL))
86 perror_msg_and_fail("sigprocmask SIG_BLOCK");
87 }
88
89 rc = k_signal(SIGUSR1, sig_dfl);
90
91 if (rc == -1L) {
92 printf("signal(SIGUSR1, SIG_DFL) = %s\n", sprintrc(rc));
93 } else if (rc != (long) sig_ign) {
94 error_msg_and_fail("signal(SIGUSR1, SIG_DFL) = %#lx\n", rc);
95 } else {
96 printf("signal(SIGUSR1, SIG_DFL) = %#lx (SIG_IGN)\n", rc);
97 }
98
99 const kernel_ulong_t addr = (kernel_ulong_t) 0xfacefeeddeadbeefULL;
100 rc = k_signal(SIGUSR1, addr);
101
102 if (rc == -1L) {
103 printf("signal(SIGUSR1, %#llx) = %s\n",
104 (unsigned long long) addr, sprintrc(rc));
105 } else if (rc != (long) sig_dfl) {
106 error_msg_and_fail("signal(SIGUSR1, %#llx) = %#lx\n",
107 (unsigned long long) addr, rc);
108 } else {
109 printf("signal(SIGUSR1, %#llx) = %#lx (SIG_DFL)\n",
110 (unsigned long long) addr, rc);
111 }
112
113 rc = k_signal(SIGUSR1, sig_ign);
114
115 if (rc == -1L) {
116 printf("signal(SIGUSR1, SIG_IGN) = %s\n", sprintrc(rc));
117 } else {
118 printf("signal(SIGUSR1, SIG_IGN) = %#lx\n", rc);
119 }
120
121 rc = k_signal(addr, sig_ign);
122 printf("signal(%d, SIG_IGN) = %s\n", (int) addr, sprintrc(rc));
123
124 puts("+++ exited with 0 +++");
125 return 0;
126 }
127
128 #else
129
130 SKIP_MAIN_UNDEFINED("__NR_signal")
131
132 #endif
133