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 * MPR References within the address range starting at pa and
8 * continuing for len bytes to whole pages following the end
9 * of an object shall result in delivery of a SIGBUS signal.
10 *
11 * Test step:
12 * 1. Map a shared memory object of size 1/2 * page_size,
13 *    with len = 2 * page_size
14 * 2. If Memory Protection option is supported, read the second page
15 *    beyond the end of the object, should get SIGBUS.
16 */
17
18#define _XOPEN_SOURCE 600
19
20#include <pthread.h>
21#include <stdio.h>
22#include <stdlib.h>
23#include <unistd.h>
24#include <sys/mman.h>
25#include <sys/types.h>
26#include <sys/stat.h>
27#include <sys/wait.h>
28#include <fcntl.h>
29#include <string.h>
30#include <errno.h>
31#include "posixtest.h"
32
33#define TNAME "mmap/11-3.c"
34
35
36void sigbus_handler (int signum)
37{
38  printf("Test Pass: " TNAME " Trigger SIGBUS\n");
39  exit(PTS_PASS);
40}
41
42int main()
43{
44#ifndef _POSIX_MEMORY_PROTECTION
45  printf("_POSIX_MEMORY_PROTECTION is not defined\n");
46  return PTS_UNTESTED;
47#endif
48  char tmpfname[256];
49  long  page_size;
50  long total_size;
51
52  void *pa = NULL;
53  void *addr = NULL;
54  size_t len;
55  int flag;
56  int fd;
57  off_t off = 0;
58  int prot;
59
60  char *ch = NULL;
61
62  struct sigaction sa;
63
64  page_size = sysconf(_SC_PAGE_SIZE);
65
66  /* Size of the shared memory object to be mapped */
67  total_size = page_size / 2;
68
69  /* mmap will create a partial page */
70  len = page_size * 2;
71
72  sigfillset(&sa.sa_mask);
73  sa.sa_handler = sigbus_handler;
74  sigaction(SIGBUS, &sa, NULL);
75
76  snprintf(tmpfname, sizeof(tmpfname), "pts_mmap_11_3_%ld",
77           (long)getpid());
78  /* Create shared object */
79  shm_unlink(tmpfname);
80  fd = shm_open(tmpfname, O_RDWR|O_CREAT|O_EXCL, S_IRUSR|S_IWUSR);
81  if(fd == -1)
82  {
83    printf(TNAME " Error at shm_open(): %s\n", strerror(errno));
84    return PTS_UNRESOLVED;
85  }
86  shm_unlink(tmpfname);
87  if(ftruncate(fd, total_size) == -1) {
88    printf(TNAME " Error at ftruncate(): %s\n", strerror(errno));
89    return PTS_UNRESOLVED;
90  }
91
92  prot = PROT_READ | PROT_WRITE;
93  flag = MAP_SHARED;
94  off = 0;
95  pa = mmap(addr, len, prot, flag, fd, off);
96  if (pa == MAP_FAILED)
97  {
98    printf("Test FAIL: " TNAME " Error at mmap(): %s\n",
99    	   strerror(errno));
100    exit(PTS_FAIL);
101  }
102
103  ch = pa + page_size + 1 ;
104
105  /* This reference should trigger SIGBUS */
106  *ch = 0;
107
108  /* wait for a while */
109  sleep(1);
110
111  printf("Test Fail: " TNAME " Did not trigger SIGBUS, "
112         "while Memory Protection is enabled\n");
113  exit(PTS_FAIL);
114}
115