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 write to 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 void *pa;
47 size_t size = 1024;
48 int fd;
49
50 pid_t child;
51 int status;
52 int sig_num;
53
54 snprintf(tmpfname, sizeof(tmpfname), "/tmp/pts_mmap_6_2_%d", getpid());
55 unlink(tmpfname);
56 fd = open(tmpfname, O_CREAT | O_RDWR | O_EXCL, S_IRUSR | S_IWUSR);
57 if (fd == -1) {
58 printf("Error at open(): %s\n", strerror(errno));
59 return PTS_UNRESOLVED;
60 }
61 unlink(tmpfname);
62
63 child = fork();
64 switch (child) {
65 case 0:
66 pa = mmap(NULL, size, PROT_NONE, MAP_SHARED, fd, 0);
67 if (pa == MAP_FAILED) {
68 printf("Error at mmap: %s\n", strerror(errno));
69 return PTS_FAIL;
70 }
71
72 /* Write acess */
73 *(char *)pa = 'b';
74 return 0;
75 break;
76 case -1:
77 perror("fork()");
78 return PTS_UNRESOLVED;
79 break;
80 default:
81 break;
82 }
83
84 waitpid(child, &status, 0);
85 close(fd);
86
87 if (WIFSIGNALED(status)) {
88 sig_num = WTERMSIG(status);
89 printf("Child process terminated by signal %d\n", sig_num);
90 if (sig_num == SIGSEGV) {
91 printf("Got SIGSEGV when writing to the mapped memory, "
92 "setting PROT_NOTE\n" "Test PASSED\n");
93 return PTS_PASS;
94 }
95 }
96
97 if (WIFEXITED(status)) {
98 if (WEXITSTATUS(status) == 0) {
99 printf
100 ("Did not got SIGSEGV when writing to the mapped memory, "
101 "setting PROT_NOTE\n" "Test FAILED\n");
102 return PTS_FAIL;
103 }
104
105 }
106
107 printf("Test Unresolved\n");
108 return PTS_UNRESOLVED;
109 #else
110 printf("Test Usupported: _POSIX_MEMORY_PROTECTION not defined\n");
111 return PTS_UNSUPPORTED;
112 #endif
113 }
114