1 /*
2 * Copyright (c) 2015-2016 Dmitry V. Levin <ldv@altlinux.org>
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. The name of the author may not be used to endorse or promote products
14 * derived from this software without specific prior written permission.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
21 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
22 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
23 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
25 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26 */
27
28 #include "tests.h"
29 #include <assert.h>
30 #include <dlfcn.h>
31 #include <fcntl.h>
32 #include <unistd.h>
33 #include <sys/mman.h>
34 #include <sys/wait.h>
35 #include <sys/sendfile.h>
36
main(void)37 int main(void)
38 {
39 const unsigned long pagesize = get_page_size();
40
41 #ifdef __s390__
42 /*
43 * The si_addr field is unreliable:
44 * https://marc.info/?l=linux-s390&m=142515870124248&w=2
45 */
46 error_msg_and_skip("s390: si_addr is unreliable");
47 #endif
48
49 /* write instruction pointer length to the log */
50 assert(write(-1, NULL, 2 * sizeof(void *)) < 0);
51
52 /* just a noticeable line in the log */
53 assert(munmap(&main, 0) < 0);
54
55 int pid = fork();
56 if (pid < 0)
57 perror_msg_and_fail("fork");
58
59 if (!pid) {
60 const unsigned long mask = ~(pagesize - 1);
61 unsigned long addr = (unsigned long) &main & mask;
62 unsigned long size = pagesize << 1;
63
64 #ifdef HAVE_DLADDR
65 Dl_info info;
66 if (dladdr(&main, &info)) {
67 const unsigned long base =
68 (unsigned long) info.dli_fbase & mask;
69 if (base < addr) {
70 size += addr - base;
71 addr = base;
72 }
73 } else
74 #endif
75 {
76 addr -= size;
77 size <<= 1;
78 }
79
80 /* SIGSEGV is expected */
81 (void) munmap((void *) addr, size);
82 (void) munmap((void *) addr, size);
83 error_msg_and_skip("SIGSEGV did not happen");
84 }
85
86 int status;
87 assert(wait(&status) == pid);
88 assert(WIFSIGNALED(status));
89 assert(WTERMSIG(status) == SIGSEGV);
90
91 /* dump process map for debug purposes */
92 close(0);
93 if (!open("/proc/self/maps", O_RDONLY))
94 (void) sendfile(1, 0, NULL, pagesize);
95
96 return 0;
97 }
98