1 /* 2 * Copyright (c) 2002, Intel Corporation. All rights reserved. 3 * Copyright (c) 2012, Cyril Hrubis <chrubis (at) suse.cz> 4 * 5 * This file is licensed under the GPL license. For the full content 6 * of this license, see the COPYING file at the top level of this 7 * source tree. 8 * 9 * MPR References within the address range starting at pa and 10 * continuing for len bytes to whole pages following the end 11 * of an object shall result in delivery of a SIGBUS signal. 12 * 13 * Test Steps: 14 * 1. Map a file with size = 1/2 page_size, while len = 2 * page_size 15 * 2. If Memory Protection option is supported, read the second page 16 * beyond the object (mapped file) size (NOT the patial page), 17 * should get SIGBUS; 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 <signal.h> 28 #include <stdio.h> 29 #include <stdlib.h> 30 #include <string.h> 31 #include <unistd.h> 32 #include "posixtest.h" 33 34 #define WRITE(str) write(STDOUT_FILENO, str, sizeof(str) - 1) 35 36 void sigbus_handler(int signum) 37 { 38 if (signum == SIGBUS) { 39 WRITE("SIGBUS triggered\n"); 40 WRITE("Test PASSED\n"); 41 _exit(PTS_PASS); 42 } 43 } 44 45 int main(void) 46 { 47 #ifndef _POSIX_MEMORY_PROTECTION 48 printf("_POSIX_MEMORY_PROTECTION is not defined\n"); 49 return PTS_UNTESTED; 50 #endif 51 char tmpfname[256]; 52 long page_size; 53 long total_size; 54 55 void *pa; 56 size_t len; 57 int fd; 58 59 char *ch; 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_%d", getpid()); 76 unlink(tmpfname); 77 fd = open(tmpfname, O_CREAT | O_RDWR | O_EXCL, S_IRUSR | S_IWUSR); 78 if (fd == -1) { 79 printf("Error at open(): %s\n", strerror(errno)); 80 return PTS_UNRESOLVED; 81 } 82 unlink(tmpfname); 83 84 if (ftruncate(fd, total_size) == -1) { 85 printf("Error at ftruncate(): %s\n", strerror(errno)); 86 return PTS_UNRESOLVED; 87 } 88 89 pa = mmap(NULL, len, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0); 90 if (pa == MAP_FAILED) { 91 printf("Error at mmap(): %s\n", strerror(errno)); 92 return PTS_FAIL; 93 } 94 95 /* Read the second page */ 96 ch = pa + page_size + 1; 97 98 /* This reference should trigger SIGBUS */ 99 *ch = 0; 100 101 /* wait for a while */ 102 sleep(1); 103 104 printf("Test FAILED: SIGBUS not triggered, " 105 "while Memory Protection is enabled\n"); 106 return PTS_FAIL; 107 } 108
