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 #include "posixtest.h"
41
main(void)42 int main(void)
43 {
44 #ifdef _POSIX_MEMORY_PROTECTION
45 char tmpfname[256];
46 ssize_t size = 1024;
47 char data[size];
48 void *pa;
49 int fd;
50
51 pid_t child;
52 int status;
53 int sig_num;
54
55 snprintf(tmpfname, sizeof(tmpfname), "/tmp/pts_mmap_6_2_%d", getpid());
56 unlink(tmpfname);
57 fd = open(tmpfname, O_CREAT | O_RDWR | O_EXCL, S_IRUSR | S_IWUSR);
58 if (fd == -1) {
59 printf("Error at open(): %s\n", strerror(errno));
60 return PTS_UNRESOLVED;
61 }
62 unlink(tmpfname);
63
64 child = fork();
65 switch (child) {
66 case 0:
67 memset(data, 'a', size);
68 if (write(fd, data, size) != size) {
69 printf("Error at write(): %s\n", strerror(errno));
70 return PTS_UNRESOLVED;
71 }
72
73 pa = mmap(NULL, size, PROT_NONE, MAP_SHARED, fd, 0);
74 if (pa == MAP_FAILED) {
75 printf("Error at mmap: %s\n", strerror(errno));
76 return PTS_FAIL;
77 }
78
79 /* Read acess */
80 if (*(char *)pa != 'a') {
81 printf("Test Fail: The file is not mapped correctly\n");
82 return PTS_FAIL;
83 }
84 return 0;
85 break;
86 case -1:
87 printf("Error at fork(): %s\n", strerror(errno));
88 return PTS_UNRESOLVED;
89 break;
90 default:
91 break;
92 }
93
94 waitpid(child, &status, 0);
95 close(fd);
96
97 if (WIFSIGNALED(status)) {
98 sig_num = WTERMSIG(status);
99 printf("Child process terminated by signal %d\n", sig_num);
100 if (sig_num == SIGSEGV) {
101 printf("Got SIGSEGV when reading the mapped memory, "
102 "setting PROT_NOTE\n" "Test PASSED\n");
103 return PTS_PASS;
104 }
105 }
106
107 if (WIFEXITED(status)) {
108 if (WEXITSTATUS(status) == 0) {
109 printf
110 ("Did not got SIGSEGV when reading the mapped memory, "
111 "setting PROT_NOTE\n" "Test FAILED\n");
112 return PTS_FAIL;
113 }
114
115 }
116
117 printf("Test Unresolved\n");
118 return PTS_UNRESOLVED;
119 #else
120 printf("Test Usupported: _POSIX_MEMORY_PROTECTION not defined\n");
121 return PTS_UNSUPPORTED;
122 #endif
123 }
124