1 /*
2 * Copyright (c) 2002, Intel Corporation. All rights reserved.
3 * Copyright (c) 2012, Cyril Hrubis <chrubis@suse.cz>
4 *
5 * This file is licensed under the GPL license. For the full content
6 * of this license, see the COPYING file at the top level of this
7 * source tree.
8 *
9 * MPR An implementation may permit accesses other than those specified by prot;
10 * however, if the Memory Protection option is supported, the implementation
11 * shall not permit a write to succeed where PROT_WRITE has not been set or
12 * shall not permit any access where PROT_NONE alone has been set.
13 * The implementation shall support at least the following values of prot:
14 * PROT_NONE, PROT_READ, PROT_WRITE, and the bitwise-inclusive OR of PROT_READ
15 * and PROT_WRITE.
16 *
17 * Test Steps:
18 *
19 * If the Memory Protection option is supported:
20 *
21 * 1. Spawn a child process.
22 * 2. The child process mmap a memory region setting prot as PROT_NONE.
23 * 3. Try to read the mapped memory.
24 * 4. If the read will triger SIGSEGV, the PASS.
25 *
26 * Please refer to IEEE_1003.1-2001. 2.8.3.3 Memory Protection.
27 */
28
29 #include <sys/mman.h>
30 #include <sys/types.h>
31 #include <sys/stat.h>
32 #include <sys/wait.h>
33 #include <errno.h>
34 #include <fcntl.h>
35 #include <signal.h>
36 #include <stdio.h>
37 #include <stdlib.h>
38 #include <string.h>
39 #include <unistd.h>
40
41 #include "posixtest.h"
42 #include "tempfile.h"
43
main(void)44 int main(void)
45 {
46 #ifdef _POSIX_MEMORY_PROTECTION
47 char tmpfname[PATH_MAX];
48 ssize_t size = 1024;
49 char data[size];
50 void *pa;
51 int fd;
52
53 pid_t child;
54 int status;
55 int sig_num;
56
57 PTS_GET_TMP_FILENAME(tmpfname, "pts_mmap_6_2");
58 unlink(tmpfname);
59 fd = open(tmpfname, O_CREAT | O_RDWR | O_EXCL, S_IRUSR | S_IWUSR);
60 if (fd == -1) {
61 printf("Error at open(): %s\n", strerror(errno));
62 return PTS_UNRESOLVED;
63 }
64 unlink(tmpfname);
65
66 child = fork();
67 switch (child) {
68 case 0:
69 memset(data, 'a', size);
70 if (write(fd, data, size) != size) {
71 printf("Error at write(): %s\n", strerror(errno));
72 return PTS_UNRESOLVED;
73 }
74
75 pa = mmap(NULL, size, PROT_NONE, MAP_SHARED, fd, 0);
76 if (pa == MAP_FAILED) {
77 printf("Error at mmap: %s\n", strerror(errno));
78 return PTS_FAIL;
79 }
80
81 /* Read acess */
82 if (*(char *)pa != 'a') {
83 printf("Test Fail: The file is not mapped correctly\n");
84 return PTS_FAIL;
85 }
86 return 0;
87 break;
88 case -1:
89 printf("Error at fork(): %s\n", strerror(errno));
90 return PTS_UNRESOLVED;
91 break;
92 default:
93 break;
94 }
95
96 waitpid(child, &status, 0);
97 close(fd);
98
99 if (WIFSIGNALED(status)) {
100 sig_num = WTERMSIG(status);
101 printf("Child process terminated by signal %d\n", sig_num);
102 if (sig_num == SIGSEGV) {
103 printf("Got SIGSEGV when reading the mapped memory, "
104 "setting PROT_NOTE\n" "Test PASSED\n");
105 return PTS_PASS;
106 }
107 }
108
109 if (WIFEXITED(status)) {
110 if (WEXITSTATUS(status) == 0) {
111 printf
112 ("Did not got SIGSEGV when reading the mapped memory, "
113 "setting PROT_NOTE\n" "Test FAILED\n");
114 return PTS_FAIL;
115 }
116
117 }
118
119 printf("Test Unresolved\n");
120 return PTS_UNRESOLVED;
121 #else
122 printf("Test Usupported: _POSIX_MEMORY_PROTECTION not defined\n");
123 return PTS_UNSUPPORTED;
124 #endif
125 }
126