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 file with size = 1/2 page_size, while len = 2 * page_size 13 * 2. If Memory Protection option is supported, read the second page 14 * beyond the object (mapped file) size (NOT the patial page), 15 * 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/11-2.c" 34 35void sigbus_handler (int signum) 36{ 37 printf("Test Pass: " TNAME " Trigger SIGBUS\n"); 38 exit(PTS_PASS); 39} 40 41int main() 42{ 43#ifndef _POSIX_MEMORY_PROTECTION 44 printf("_POSIX_MEMORY_PROTECTION is not defined\n"); 45 return PTS_UNTESTED; 46#endif 47 char tmpfname[256]; 48 long page_size; 49 long total_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 char *ch = NULL; 60 struct sigaction sa; 61 62 page_size = sysconf(_SC_PAGE_SIZE); 63 64 /* Size of the file to be mapped */ 65 total_size = page_size / 2; 66 67 /* mmap 2 pages */ 68 len = page_size * 2; 69 70 sigfillset(&sa.sa_mask); 71 sa.sa_handler = sigbus_handler; 72 sigaction(SIGBUS, &sa, NULL); 73 74 /* Create tmp file */ 75 snprintf(tmpfname, sizeof(tmpfname), "/tmp/pts_mmap_11_2_%ld", 76 (long)getpid()); 77 unlink(tmpfname); 78 fd = open(tmpfname, O_CREAT | O_RDWR | O_EXCL, 79 S_IRUSR | S_IWUSR); 80 if (fd == -1) 81 { 82 printf(TNAME " Error at open(): %s\n", 83 strerror(errno)); 84 exit(PTS_UNRESOLVED); 85 } 86 unlink(tmpfname); 87 88 if (ftruncate(fd, total_size) == -1) 89 { 90 printf(TNAME "Error at ftruncate(): %s\n", 91 strerror(errno)); 92 exit(PTS_UNRESOLVED); 93 } 94 95 prot = PROT_READ | PROT_WRITE; 96 flag = MAP_SHARED; 97 off = 0; 98 pa = mmap(addr, len, prot, flag, fd, off); 99 if (pa == MAP_FAILED) 100 { 101 printf("Test FAIL: " TNAME " Error at mmap(): %s\n", 102 strerror(errno)); 103 exit(PTS_FAIL); 104 } 105 106 /* Read the second page */ 107 ch = pa + page_size + 1; 108 109 /* This reference should trigger SIGBUS */ 110 *ch = 0; 111 112 /* wait for a while */ 113 sleep(1); 114 115 printf("Test Fail: " TNAME " Did not trigger SIGBUS, " 116 "while Memory Protection is enabled\n"); 117 exit(PTS_FAIL); 118} 119