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 shared memory object of size 1/2 * page_size, 15 * with len = 2 * page_size 16 * 2. If Memory Protection option is supported, read the second page 17 * beyond the end of the object, should get SIGBUS. 18 */ 19 20 #define _XOPEN_SOURCE 600 21 22 #include <sys/mman.h> 23 #include <sys/types.h> 24 #include <sys/stat.h> 25 #include <sys/wait.h> 26 #include <errno.h> 27 #include <fcntl.h> 28 #include <signal.h> 29 #include <stdio.h> 30 #include <stdlib.h> 31 #include <string.h> 32 #include <unistd.h> 33 #include "posixtest.h" 34 35 #define WRITE(str) write(STDOUT_FILENO, str, sizeof(str) - 1) 36 37 void sigbus_handler(int signum) 38 { 39 if (signum == SIGBUS) { 40 WRITE("SIGBUS triggered\n"); 41 WRITE("Test PASSED\n"); 42 _exit(PTS_PASS); 43 } 44 } 45 46 int main(void) 47 { 48 #ifndef _POSIX_MEMORY_PROTECTION 49 printf("_POSIX_MEMORY_PROTECTION is not defined\n"); 50 return PTS_UNTESTED; 51 #endif 52 char tmpfname[256]; 53 long page_size; 54 long total_size; 55 56 void *pa; 57 size_t len; 58 int fd; 59 60 char *ch; 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_%d", getpid()); 77 /* Create shared object */ 78 shm_unlink(tmpfname); 79 fd = shm_open(tmpfname, O_RDWR | O_CREAT | O_EXCL, S_IRUSR | S_IWUSR); 80 if (fd == -1) { 81 printf("Error at shm_open(): %s\n", strerror(errno)); 82 return PTS_UNRESOLVED; 83 } 84 shm_unlink(tmpfname); 85 if (ftruncate(fd, total_size) == -1) { 86 printf("Error at ftruncate(): %s\n", strerror(errno)); 87 return PTS_UNRESOLVED; 88 } 89 90 pa = mmap(NULL, len, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0); 91 if (pa == MAP_FAILED) { 92 printf("Error at mmap(): %s\n", strerror(errno)); 93 return PTS_FAIL; 94 } 95 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
