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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 #define _XOPEN_SOURCE 600
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_1_%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 
65 	switch (child) {
66 	case 0:
67 		if (ftruncate(fd, size) == -1) {
68 			printf("Error at ftruncate(): %s\n", strerror(errno));
69 			return PTS_UNRESOLVED;
70 		}
71 
72 		pa = mmap(NULL, size, PROT_READ, MAP_SHARED, fd, 0);
73 		if (pa == MAP_FAILED) {
74 			printf("Error at mmap: %s\n", strerror(errno));
75 			return PTS_FAIL;
76 		}
77 
78 		*(char *)pa = 'b';
79 		return 0;
80 		break;
81 	case -1:
82 		printf("Error at fork(): %s\n", strerror(errno));
83 		return PTS_UNRESOLVED;
84 		break;
85 	default:
86 		break;
87 	}
88 
89 	waitpid(child, &status, WUNTRACED);
90 	close(fd);
91 
92 	if (WIFSIGNALED(status)) {
93 		sig_num = WTERMSIG(status);
94 		printf("Child process terminated by signal %d\n", sig_num);
95 		if (sig_num == SIGSEGV) {
96 			printf("Got SIGSEGV when writing to the mapped memory, "
97 			       "without setting PROT_WRITE\n" "Test PASSED\n");
98 			return PTS_PASS;
99 		}
100 	}
101 
102 	if (WIFEXITED(status)) {
103 		if (WEXITSTATUS(status) == 0) {
104 			printf
105 			    ("Did not got SIGSEGV when writing to the mapped memory,"
106 			     " without setting PROT_WRITE\n" "Test FAILED\n");
107 			return PTS_FAIL;
108 		}
109 	}
110 
111 	printf("Test Unresolved\n");
112 	return PTS_UNRESOLVED;
113 #else
114 	printf("Test Unsupported, _POSIX_MEMORY_PROTECTION not defined\n");
115 	return PTS_UNSUPPORTED;
116 #endif
117 }
118