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
21 #include <sys/mman.h>
22 #include <sys/types.h>
23 #include <sys/stat.h>
24 #include <sys/wait.h>
25 #include <errno.h>
26 #include <fcntl.h>
27 #include <pthread.h>
28 #include <signal.h>
29 #include <stdio.h>
30 #include <stdlib.h>
31 #include <string.h>
32 #include <unistd.h>
33
34 #include "posixtest.h"
35 #include "tempfile.h"
36
37 #define TNAME "munmap/1-2.c"
38
sigsegv_handler(int signum PTS_ATTRIBUTE_UNUSED)39 static void sigsegv_handler(int signum PTS_ATTRIBUTE_UNUSED)
40 {
41 printf("Got SIGSEGV\n");
42 printf("Test PASSED\n");
43 exit(PTS_PASS);
44 }
45
main(void)46 int main(void)
47 {
48 char tmpfname[PATH_MAX];
49 long file_size;
50
51 void *pa = NULL;
52 void *addr = NULL;
53 size_t len;
54 int flag;
55 int fd;
56 off_t off = 0;
57 int prot;
58
59 int page_size;
60
61 char *ch;
62
63 struct sigaction sa;
64
65 sigfillset(&sa.sa_mask);
66 sa.sa_handler = sigsegv_handler;
67 sigaction(SIGSEGV, &sa, NULL);
68
69 page_size = sysconf(_SC_PAGE_SIZE);
70 file_size = 2 * page_size;
71
72 /* We hope to map 2 pages */
73 len = page_size + 1;
74
75 /* Create tmp file */
76 PTS_GET_TMP_FILENAME(tmpfname, "pts_munmap_1_2");
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