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 #define _XOPEN_SOURCE 600
30 #include <sys/mman.h>
31 #include <sys/types.h>
32 #include <sys/stat.h>
33 #include <sys/wait.h>
34 #include <errno.h>
35 #include <fcntl.h>
36 #include <signal.h>
37 #include <stdio.h>
38 #include <stdlib.h>
39 #include <string.h>
40 #include <unistd.h>
41 #include "posixtest.h"
42
main(void)43 int main(void)
44 {
45 #ifdef _POSIX_MEMORY_PROTECTION
46 char tmpfname[256];
47 ssize_t size = 1024;
48 char data[size];
49 void *pa;
50 int fd;
51
52 pid_t child;
53 int status;
54 int sig_num;
55
56 snprintf(tmpfname, sizeof(tmpfname), "/tmp/pts_mmap_6_2_%d", getpid());
57 unlink(tmpfname);
58 fd = open(tmpfname, O_CREAT | O_RDWR | O_EXCL, S_IRUSR | S_IWUSR);
59 if (fd == -1) {
60 printf("Error at open(): %s\n", strerror(errno));
61 return PTS_UNRESOLVED;
62 }
63 unlink(tmpfname);
64
65 child = fork();
66 switch (child) {
67 case 0:
68 memset(data, 'a', size);
69 if (write(fd, data, size) != size) {
70 printf("Error at write(): %s\n", strerror(errno));
71 return PTS_UNRESOLVED;
72 }
73
74 pa = mmap(NULL, size, PROT_NONE, MAP_SHARED, fd, 0);
75 if (pa == MAP_FAILED) {
76 printf("Error at mmap: %s\n", strerror(errno));
77 return PTS_FAIL;
78 }
79
80 /* Read acess */
81 if (*(char *)pa != 'a') {
82 printf("Test Fail: The file is not mapped correctly\n");
83 return PTS_FAIL;
84 }
85 return 0;
86 break;
87 case -1:
88 printf("Error at fork(): %s\n", strerror(errno));
89 return PTS_UNRESOLVED;
90 break;
91 default:
92 break;
93 }
94
95 waitpid(child, &status, 0);
96 close(fd);
97
98 if (WIFSIGNALED(status)) {
99 sig_num = WTERMSIG(status);
100 printf("Child process terminated by signal %d\n", sig_num);
101 if (sig_num == SIGSEGV) {
102 printf("Got SIGSEGV when reading the mapped memory, "
103 "setting PROT_NOTE\n" "Test PASSED\n");
104 return PTS_PASS;
105 }
106 }
107
108 if (WIFEXITED(status)) {
109 if (WEXITSTATUS(status) == 0) {
110 printf
111 ("Did not got SIGSEGV when reading the mapped memory, "
112 "setting PROT_NOTE\n" "Test FAILED\n");
113 return PTS_FAIL;
114 }
115
116 }
117
118 printf("Test Unresolved\n");
119 return PTS_UNRESOLVED;
120 #else
121 printf("Test Usupported: _POSIX_MEMORY_PROTECTION not defined\n");
122 return PTS_UNSUPPORTED;
123 #endif
124 }
125