testcases/open_posix_testsuite/conformance/interfaces/mmap/11-3.c

/*
 * Copyright (c) 2002, Intel Corporation. All rights reserved.
 * This file is licensed under the GPL license.  For the full content
 * of this license, see the COPYING file at the top level of this
 * source tree.
 *
 * MPR References within the address range starting at pa and
 * continuing for len bytes to whole pages following the end
 * of an object shall result in delivery of a SIGBUS signal.
 *
 * Test step:
 * 1. Map a shared memory object of size 1/2 * page_size,
 *    with len = 2 * page_size
 * 2. If Memory Protection option is supported, read the second page
 *    beyond the end of the object, should get SIGBUS.
 */

#define _XOPEN_SOURCE 600

#include <sys/mman.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/wait.h>
#include <errno.h>
#include <fcntl.h>
#include <pthread.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "posixtest.h"

#define TNAME "mmap/11-3.c"

void sigbus_handler (int signum)
{
  printf("Test Pass: " TNAME " Trigger SIGBUS\n");
  exit(PTS_PASS);
}

int main()
{
#ifndef _POSIX_MEMORY_PROTECTION
  printf("_POSIX_MEMORY_PROTECTION is not defined\n");
  return PTS_UNTESTED;
#endif
  char tmpfname[256];
  long  page_size;
  long total_size;

  void *pa = NULL;
  void *addr;
  size_t len;
  int flag;
  int fd;
  off_t off = 0;
  int prot;

  char *ch = NULL;

  struct sigaction sa;

  page_size = sysconf(_SC_PAGE_SIZE);

  /* Size of the shared memory object to be mapped */
  total_size = page_size / 2;

  /* mmap will create a partial page */
  len = page_size * 2;

  sigfillset(&sa.sa_mask);
  sa.sa_handler = sigbus_handler;
  sigaction(SIGBUS, &sa, NULL);

  snprintf(tmpfname, sizeof(tmpfname), "/pts_mmap_11_3_%d",
           getpid());
  /* Create shared object */
  shm_unlink(tmpfname);
  fd = shm_open(tmpfname, O_RDWR|O_CREAT|O_EXCL, S_IRUSR|S_IWUSR);
  if (fd == -1)
  {
    printf(TNAME " Error at shm_open(): %s\n", strerror(errno));
    return PTS_UNRESOLVED;
  }
  shm_unlink(tmpfname);
  if (ftruncate(fd, total_size) == -1) {
    printf(TNAME " Error at ftruncate(): %s\n", strerror(errno));
    return PTS_UNRESOLVED;
  }

  prot = PROT_READ | PROT_WRITE;
  flag = MAP_SHARED;
  off = 0;
  pa = mmap(addr, len, prot, flag, fd, off);
  if (pa == MAP_FAILED)
  {
    printf("Test FAIL: " TNAME " Error at mmap(): %s\n",
    	   strerror(errno));
    exit(PTS_FAIL);
  }

  ch = pa + page_size + 1 ;

  /* This reference should trigger SIGBUS */
  *ch = 0;

  /* wait for a while */
  sleep(1);

  printf("Test Fail: " TNAME " Did not trigger SIGBUS, "
         "while Memory Protection is enabled\n");
  exit(PTS_FAIL);
}