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1 /*
2  * Copyright (c) 2002, Intel Corporation. All rights reserved.
3  * This file is licensed under the GPL license.  For the full content
4  * of this license, see the COPYING file at the top level of this
5  * source tree.
6  *
7  * The munmap() function shall remove any mappings for those
8  * entire pages containing any part of the address space of
9  * the process starting at addr and continuing for len bytes.
10  * Further references to these pages shall result in the
11  * generation of a SIGSEGV signal to the process.
12  *
13  * Test Step:
14  * 1. map a file into memory;
15  * 2. unmap;
16  * 3. Try to reference the unmapped memory, test whether SIGSEGV
17  *    is triggered.
18  */
19 
20 #define _XOPEN_SOURCE 600
21 
22 #include <sys/mman.h>
23 #include <sys/types.h>
24 #include <sys/stat.h>
25 #include <sys/wait.h>
26 #include <errno.h>
27 #include <fcntl.h>
28 #include <pthread.h>
29 #include <signal.h>
30 #include <stdio.h>
31 #include <stdlib.h>
32 #include <string.h>
33 #include <unistd.h>
34 #include "posixtest.h"
35 
36 #define TNAME "munmap/1-2.c"
37 
sigsegv_handler(int signum)38 void sigsegv_handler(int signum)
39 {
40 	printf("Got SIGSEGV\n");
41 	printf("Test PASSED\n");
42 	exit(PTS_PASS);
43 }
44 
main(void)45 int main(void)
46 {
47 	char tmpfname[256];
48 	long file_size;
49 
50 	void *pa = NULL;
51 	void *addr = NULL;
52 	size_t len;
53 	int flag;
54 	int fd;
55 	off_t off = 0;
56 	int prot;
57 
58 	int page_size;
59 
60 	char *ch;
61 
62 	struct sigaction sa;
63 
64 	sigfillset(&sa.sa_mask);
65 	sa.sa_handler = sigsegv_handler;
66 	sigaction(SIGSEGV, &sa, NULL);
67 
68 	page_size = sysconf(_SC_PAGE_SIZE);
69 	file_size = 2 * page_size;
70 
71 	/* We hope to map 2 pages */
72 	len = page_size + 1;
73 
74 	/* Create tmp file */
75 	snprintf(tmpfname, sizeof(tmpfname), "/tmp/pts_munmap_1_1_%d",
76 		 getpid());
77 	unlink(tmpfname);
78 	fd = open(tmpfname, O_CREAT | O_RDWR | O_EXCL, S_IRUSR | S_IWUSR);
79 	if (fd == -1) {
80 		printf(TNAME " Error at open(): %s\n", strerror(errno));
81 		exit(PTS_UNRESOLVED);
82 	}
83 	unlink(tmpfname);
84 
85 	if (ftruncate(fd, file_size) == -1) {
86 		printf("Error at ftruncate: %s\n", strerror(errno));
87 		exit(PTS_UNRESOLVED);
88 	}
89 
90 	flag = MAP_SHARED;
91 	prot = PROT_READ | PROT_WRITE;
92 	pa = mmap(addr, len, prot, flag, fd, off);
93 	if (pa == MAP_FAILED) {
94 		printf("Test UNRESOLVED: " TNAME " Error at mmap: %s\n",
95 		       strerror(errno));
96 		exit(PTS_UNRESOLVED);
97 	}
98 
99 	ch = pa;
100 	*ch = 'b';
101 
102 	close(fd);
103 	munmap(pa, len);
104 
105 	/* Should trigger SIGSEGV here */
106 	*ch = 'a';
107 
108 	printf("Test FAILED: Did not trigger SIGSEGV\n");
109 	return PTS_FAIL;
110 }
111