1/*
2 * Copyright (c) 2013 FNST, DAN LI <li.dan@cn.fujitsu.com>
3 *
4 * This program is free software;  you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; either version 2 of the License, or
7 * (at your option) any later version.
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY;  without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
12 * the GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program;  if not, write to the Free Software
16 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
17 */
18
19/*
20 * Test Description:
21 *  Verify error signal SIGBUS.
22 *  "Attempted access to a portion of the buffer that does not correspond
23 *   to the file."
24 *
25 * Expected Result:
26 *  mmap() should succeed returning the address of the mapped region,
27 *  and an attempt to access the memory which does not correspond to the file
28 *  should rise the signal SIGBUS.
29 */
30#include <stdio.h>
31#include <stdlib.h>
32#include <sys/types.h>
33#include <errno.h>
34#include <unistd.h>
35#include <fcntl.h>
36#include <string.h>
37#include <signal.h>
38#include <sys/stat.h>
39#include <sys/mman.h>
40#include <setjmp.h>
41
42#include "test.h"
43
44#define TEMPFILE	"mmapfile"
45
46char *TCID = "mmap13";
47int TST_TOTAL = 1;
48
49static size_t page_sz;
50static char *addr;
51static int fildes;
52static volatile sig_atomic_t pass;
53static sigjmp_buf env;
54
55static void setup(void);
56static void cleanup(void);
57static void sig_handler(int sig);
58
59int main(int argc, char *argv[])
60{
61	int lc;
62	char *ch;
63
64	tst_parse_opts(argc, argv, NULL, NULL);
65
66	setup();
67
68	for (lc = 0; TEST_LOOPING(lc); lc++) {
69		tst_count = 0;
70
71		addr = mmap(NULL, page_sz * 2, PROT_READ | PROT_WRITE,
72			    MAP_FILE | MAP_SHARED, fildes, 0);
73
74		if (addr == MAP_FAILED) {
75			tst_resm(TFAIL | TERRNO, "mmap() failed on %s",
76				 TEMPFILE);
77			continue;
78		}
79
80		if (sigsetjmp(env, 1) == 0) {
81			ch = addr + page_sz + 1;
82			*ch = 0;
83		}
84
85		if (pass)
86			tst_resm(TPASS, "Got SIGBUS "
87					"as expected");
88		else
89			tst_resm(TFAIL, "Invalid access not "
90						"rise SIGBUS");
91
92		if (munmap(addr, page_sz * 2) != 0)
93			tst_brkm(TFAIL | TERRNO, cleanup,
94				 "failed to unmap the mmapped pages");
95
96		pass = 0;
97	}
98
99	cleanup();
100	tst_exit();
101}
102
103static void setup(void)
104{
105	tst_sig(NOFORK, sig_handler, cleanup);
106
107	TEST_PAUSE;
108
109	page_sz = getpagesize();
110
111	tst_tmpdir();
112
113	fildes = open(TEMPFILE, O_RDWR | O_CREAT, 0766);
114	if (fildes < 0)
115		tst_brkm(TFAIL | TERRNO, cleanup, "opening %s failed",
116			 TEMPFILE);
117
118	if (ftruncate(fildes, page_sz / 2) == -1)
119		tst_brkm(TFAIL | TERRNO, cleanup, "ftruncate %s failed",
120			 TEMPFILE);
121}
122
123/*
124 *   This function gets executed when the test process receives
125 *   the signal SIGBUS while trying to access the memory which
126 *   does not correspond to the file.
127 */
128static void sig_handler(int sig)
129{
130	if (sig == SIGBUS) {
131		pass = 1;
132		siglongjmp(env, 1);
133	} else {
134		tst_brkm(TBROK, cleanup, "received an unexpected signal");
135	}
136}
137
138static void cleanup(void)
139{
140	close(fildes);
141	tst_rmdir();
142}
143