1 /*
2  * Copyright (c) 2015-2016 Dmitry V. Levin <ldv@altlinux.org>
3  * Copyright (c) 2015-2017 The strace developers.
4  * All rights reserved.
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  * 3. The name of the author may not be used to endorse or promote products
15  *    derived from this software without specific prior written permission.
16  *
17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27  */
28 
29 /*
30  * Based on test by Dr. David Alan Gilbert <dave@treblig.org>
31  */
32 
33 #include "tests.h"
34 #include "nsig.h"
35 #include <assert.h>
36 #include <stdio.h>
37 #include <unistd.h>
38 #include <sys/select.h>
39 #include <asm/unistd.h>
40 #include <sys/time.h>
41 
42 #ifdef __NR_pselect6
43 
44 static fd_set set[3][0x1000000 / sizeof(fd_set)];
45 
46 static void
handler(int signo)47 handler(int signo)
48 {
49 }
50 
main(int ac,char ** av)51 int main(int ac, char **av)
52 {
53 	int fds[2];
54 	struct {
55 		struct timespec ts;
56 		int pad[2];
57 	} tm_in = {
58 		.ts = { .tv_sec = 0xc0de1, .tv_nsec = 0xc0de2 },
59 		.pad = { 0xdeadbeef, 0xbadc0ded }
60 	}, tm = tm_in;
61 	sigset_t mask;
62 	const struct sigaction act = { .sa_handler = handler };
63 	const struct itimerval itv = { .it_value.tv_usec = 111111 };
64 
65 	sigemptyset(&mask);
66 	sigaddset(&mask, SIGHUP);
67 	sigaddset(&mask, SIGCHLD);
68 
69 	if (pipe(fds))
70 		perror_msg_and_fail("pipe");
71 
72 	/*
73 	 * Start with a nice simple pselect.
74 	 */
75 	FD_SET(fds[0], set[0]);
76 	FD_SET(fds[1], set[0]);
77 	FD_SET(fds[0], set[1]);
78 	FD_SET(fds[1], set[1]);
79 	FD_SET(1, set[2]);
80 	FD_SET(2, set[2]);
81 	int rc = pselect(fds[1] + 1, set[0], set[1], set[2], NULL, NULL);
82 	if (rc < 0)
83 		perror_msg_and_skip("pselect");
84 	assert(rc == 1);
85 	printf("pselect6(%d, [%d %d], [%d %d], [1 2], NULL, {NULL, %u}) "
86 	       "= 1 (out [%d])\n",
87 	       fds[1] + 1, fds[0], fds[1],
88 	       fds[0], fds[1],
89 	       NSIG_BYTES, fds[1]);
90 
91 	/*
92 	 * Another simple one, with a timeout.
93 	 */
94 	FD_SET(1, set[1]);
95 	FD_SET(2, set[1]);
96 	FD_SET(fds[0], set[1]);
97 	FD_SET(fds[1], set[1]);
98 	assert(syscall(__NR_pselect6, fds[1] + 1, NULL, set[1], NULL, &tm.ts, NULL) == 3);
99 	printf("pselect6(%d, NULL, [1 2 %d %d], NULL"
100 	       ", {tv_sec=%lld, tv_nsec=%llu}, NULL) = 3 (out [1 2 %d]"
101 	       ", left {tv_sec=%lld, tv_nsec=%llu})\n",
102 	       fds[1] + 1, fds[0], fds[1], (long long) tm_in.ts.tv_sec,
103 	       zero_extend_signed_to_ull(tm_in.ts.tv_nsec),
104 	       fds[1], (long long) tm.ts.tv_sec,
105 	       zero_extend_signed_to_ull(tm.ts.tv_nsec));
106 
107 	/*
108 	 * Now the crash case that trinity found, negative nfds
109 	 * but with a pointer to a large chunk of valid memory.
110 	 */
111 	FD_ZERO(set[0]);
112 	FD_SET(fds[1], set[0]);
113 	assert(pselect(-1, NULL, set[0], NULL, NULL, &mask) == -1);
114 	printf("pselect6(-1, NULL, %p, NULL, NULL, {[HUP CHLD], %u}) "
115 	       "= -1 EINVAL (%m)\n", set[0], NSIG_BYTES);
116 
117 	/*
118 	 * Another variant, with nfds exceeding FD_SETSIZE limit.
119 	 */
120 	FD_ZERO(set[0]);
121 	FD_SET(fds[0], set[0]);
122 	FD_ZERO(set[1]);
123 	tm.ts.tv_sec = 0;
124 	tm.ts.tv_nsec = 123;
125 	assert(pselect(FD_SETSIZE + 1, set[0], set[1], NULL, &tm.ts, &mask) == 0);
126 	printf("pselect6(%d, [%d], [], NULL, {tv_sec=0, tv_nsec=123}"
127 	       ", {[HUP CHLD], %u}) = 0 (Timeout)\n",
128 	       FD_SETSIZE + 1, fds[0], NSIG_BYTES);
129 
130 	/*
131 	 * See how timeouts are decoded.
132 	 */
133 	tm.ts.tv_sec = 0xdeadbeefU;
134 	tm.ts.tv_nsec = 0xfacefeedU;
135 	assert(pselect(0, NULL, NULL, NULL, &tm.ts, NULL) == -1);
136 	printf("pselect6(0, NULL, NULL, NULL"
137 	       ", {tv_sec=%lld, tv_nsec=%llu}, {NULL, %u}) = %s\n",
138 	       (long long) tm.ts.tv_sec,
139 	       zero_extend_signed_to_ull(tm.ts.tv_nsec),
140 	       NSIG_BYTES, sprintrc(-1));
141 
142 	tm.ts.tv_sec = (time_t) 0xcafef00ddeadbeefLL;
143 	tm.ts.tv_nsec = (long) 0xbadc0dedfacefeedLL;
144 	assert(pselect(0, NULL, NULL, NULL, &tm.ts, NULL) == -1);
145 	printf("pselect6(0, NULL, NULL, NULL"
146 	       ", {tv_sec=%lld, tv_nsec=%llu}, {NULL, %u}) = %s\n",
147 	       (long long) tm.ts.tv_sec,
148 	       zero_extend_signed_to_ull(tm.ts.tv_nsec),
149 	       NSIG_BYTES, sprintrc(-1));
150 
151 	assert(sigaction(SIGALRM, &act, NULL) == 0);
152 	assert(setitimer(ITIMER_REAL, &itv, NULL) == 0);
153 
154 	tm.ts.tv_sec = 0;
155 	tm.ts.tv_nsec = 222222222;
156 	assert(pselect(0, NULL, NULL, NULL, &tm.ts, &mask) == -1);
157 	printf("pselect6(0, NULL, NULL, NULL, {tv_sec=0, tv_nsec=222222222}"
158 	       ", {[HUP CHLD], %u})"
159 	       " = ? ERESTARTNOHAND (To be restarted if no handler)\n",
160 	       NSIG_BYTES);
161 	puts("--- SIGALRM {si_signo=SIGALRM, si_code=SI_KERNEL} ---");
162 
163 	puts("+++ exited with 0 +++");
164 	return 0;
165 }
166 
167 #else
168 
169 SKIP_MAIN_UNDEFINED("__NR_pselect6")
170 
171 #endif
172