1 /*
2  * Copyright (c) International Business Machines  Corp., 2001
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  *  Call mmap() to map a file creating a mapped region with read access
22  *  under the following conditions -
23  *	- The prot parameter is set to PROT_WRITE
24  *	- The file descriptor is open for writing.
25  *	- The flags parameter has MAP_PRIVATE set.
26  *
27  *  The call should fail to map the file.
28  *
29  * Expected Result:
30  *  mmap() should fail returning -1 and errno should get set to EACCES.
31  *
32  * HISTORY
33  *	07/2001 Ported by Wayne Boyer
34  */
35 #include <stdio.h>
36 #include <stdlib.h>
37 #include <sys/types.h>
38 #include <errno.h>
39 #include <unistd.h>
40 #include <fcntl.h>
41 #include <string.h>
42 #include <signal.h>
43 #include <sys/stat.h>
44 #include <sys/mman.h>
45 
46 #include "test.h"
47 
48 #define TEMPFILE	"mmapfile"
49 
50 char *TCID = "mmap07";
51 int TST_TOTAL = 1;
52 
53 static size_t page_sz;
54 static char *addr;
55 static int fildes;
56 
57 static void setup(void);
58 static void cleanup(void);
59 
60 int main(int ac, char **av)
61 {
62 	int lc;
63 
64 	tst_parse_opts(ac, av, NULL, NULL);
65 
66 	setup();
67 
68 	for (lc = 0; TEST_LOOPING(lc); lc++) {
69 
70 		tst_count = 0;
71 
72 		/*
73 		 * Call mmap to map the temporary file 'TEMPFILE'
74 		 * with write access.
75 		 */
76 		errno = 0;
77 		addr = mmap(0, page_sz, PROT_WRITE,
78 			    MAP_FILE | MAP_PRIVATE, fildes, 0);
79 		TEST_ERRNO = errno;
80 
81 		/* Check for the return value of mmap() */
82 		if (addr != MAP_FAILED) {
83 			tst_resm(TFAIL | TERRNO,
84 				 "mmap() returned invalid value, expected: %p",
85 				 MAP_FAILED);
86 			/* Unmap the mapped memory */
87 			if (munmap(addr, page_sz) != 0) {
88 				tst_resm(TBROK, "munmap() failed");
89 				cleanup();
90 			}
91 			continue;
92 		}
93 		if (TEST_ERRNO == EACCES) {
94 			tst_resm(TPASS, "mmap failed with EACCES");
95 		} else {
96 			tst_resm(TFAIL | TERRNO,
97 				 "mmap failed with unexpected errno");
98 		}
99 
100 	}
101 	cleanup();
102 	tst_exit();
103 
104 }
105 
106 static void setup(void)
107 {
108 	char *tst_buff;
109 
110 	tst_sig(NOFORK, DEF_HANDLER, cleanup);
111 
112 	TEST_PAUSE;
113 
114 	page_sz = getpagesize();
115 
116 	/* Allocate space for the test buffer */
117 	if ((tst_buff = calloc(page_sz, sizeof(char))) == NULL) {
118 		tst_brkm(TFAIL, NULL,
119 			 "calloc() failed to allocate space for tst_buff");
120 	}
121 
122 	/* Fill the test buffer with the known data */
123 	memset(tst_buff, 'A', page_sz);
124 
125 	tst_tmpdir();
126 
127 	/* Creat a temporary file used for mapping */
128 	if ((fildes = open(TEMPFILE, O_WRONLY | O_CREAT, 0666)) < 0) {
129 		free(tst_buff);
130 		tst_brkm(TFAIL, cleanup, "open() on %s failed", TEMPFILE);
131 	}
132 
133 	/* Write test buffer contents into temporary file */
134 	if (write(fildes, tst_buff, page_sz) < page_sz) {
135 		free(tst_buff);
136 		tst_brkm(TFAIL, cleanup, "writing to %s failed", TEMPFILE);
137 	}
138 
139 	free(tst_buff);
140 }
141 
142 static void cleanup(void)
143 {
144 	close(fildes);
145 	tst_rmdir();
146 }
147