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
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
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