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 Memory Protection option is supported:
20 * 1. Spawn a child process.
21 * 2. The child process mmap a memory region setting prot as PROT_READ.
22 * 3. Try to write the mapped memory.
23 * 4. If the writing triger SIGSEGV, the PASS.
24 *
25 * Please refer to IEEE_1003.1-2001. 2.8.3.3 Memory Protection.
26 */
27
28 #include <sys/mman.h>
29 #include <sys/types.h>
30 #include <sys/stat.h>
31 #include <sys/wait.h>
32 #include <errno.h>
33 #include <fcntl.h>
34 #include <signal.h>
35 #include <stdio.h>
36 #include <stdlib.h>
37 #include <string.h>
38 #include <unistd.h>
39 #include "posixtest.h"
40
main(void)41 int main(void)
42 {
43 #ifdef _POSIX_MEMORY_PROTECTION
44 char tmpfname[256];
45 void *pa;
46 size_t size = 1024;
47 int fd;
48
49 pid_t child;
50 int status;
51 int sig_num;
52
53 snprintf(tmpfname, sizeof(tmpfname), "/tmp/pts_mmap_6_1_%d", getpid());
54 unlink(tmpfname);
55 fd = open(tmpfname, O_CREAT | O_RDWR | O_EXCL, S_IRUSR | S_IWUSR);
56 if (fd == -1) {
57 printf("Error at open(): %s\n", strerror(errno));
58 return PTS_UNRESOLVED;
59 }
60 unlink(tmpfname);
61
62 child = fork();
63
64 switch (child) {
65 case 0:
66 if (ftruncate(fd, size) == -1) {
67 printf("Error at ftruncate(): %s\n", strerror(errno));
68 return PTS_UNRESOLVED;
69 }
70
71 pa = mmap(NULL, size, PROT_READ, MAP_SHARED, fd, 0);
72 if (pa == MAP_FAILED) {
73 printf("Error at mmap: %s\n", strerror(errno));
74 return PTS_FAIL;
75 }
76
77 *(char *)pa = 'b';
78 return 0;
79 break;
80 case -1:
81 printf("Error at fork(): %s\n", strerror(errno));
82 return PTS_UNRESOLVED;
83 break;
84 default:
85 break;
86 }
87
88 waitpid(child, &status, WUNTRACED);
89 close(fd);
90
91 if (WIFSIGNALED(status)) {
92 sig_num = WTERMSIG(status);
93 printf("Child process terminated by signal %d\n", sig_num);
94 if (sig_num == SIGSEGV) {
95 printf("Got SIGSEGV when writing to the mapped memory, "
96 "without setting PROT_WRITE\n" "Test PASSED\n");
97 return PTS_PASS;
98 }
99 }
100
101 if (WIFEXITED(status)) {
102 if (WEXITSTATUS(status) == 0) {
103 printf
104 ("Did not got SIGSEGV when writing to the mapped memory,"
105 " without setting PROT_WRITE\n" "Test FAILED\n");
106 return PTS_FAIL;
107 }
108 }
109
110 printf("Test Unresolved\n");
111 return PTS_UNRESOLVED;
112 #else
113 printf("Test Unsupported, _POSIX_MEMORY_PROTECTION not defined\n");
114 return PTS_UNSUPPORTED;
115 #endif
116 }
117