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 #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 void *pa;
48 size_t size = 1024;
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 pa = mmap(NULL, size, PROT_NONE, MAP_SHARED, fd, 0);
68 if (pa == MAP_FAILED) {
69 printf("Error at mmap: %s\n", strerror(errno));
70 return PTS_FAIL;
71 }
72
73 /* Write acess */
74 *(char *)pa = 'b';
75 return 0;
76 break;
77 case -1:
78 perror("fork()");
79 return PTS_UNRESOLVED;
80 break;
81 default:
82 break;
83 }
84
85 waitpid(child, &status, 0);
86 close(fd);
87
88 if (WIFSIGNALED(status)) {
89 sig_num = WTERMSIG(status);
90 printf("Child process terminated by signal %d\n", sig_num);
91 if (sig_num == SIGSEGV) {
92 printf("Got SIGSEGV when writing to the mapped memory, "
93 "setting PROT_NOTE\n" "Test PASSED\n");
94 return PTS_PASS;
95 }
96 }
97
98 if (WIFEXITED(status)) {
99 if (WEXITSTATUS(status) == 0) {
100 printf
101 ("Did not got SIGSEGV when writing to the mapped memory, "
102 "setting PROT_NOTE\n" "Test FAILED\n");
103 return PTS_FAIL;
104 }
105
106 }
107
108 printf("Test Unresolved\n");
109 return PTS_UNRESOLVED;
110 #else
111 printf("Test Usupported: _POSIX_MEMORY_PROTECTION not defined\n");
112 return PTS_UNSUPPORTED;
113 #endif
114 }
115