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 * The mmap() function shall fail if: 10 * [EOVERFLOW] The file is a regular file and the value of off 11 * plus len exceeds the offset maximum established in the open 12 * file description associated with fildes. 13 * 14 * Note: This error condition came to the standard with large 15 * file extension and cannot be triggered without it. 16 * 17 * So in order to trigger this we need 32 bit architecture 18 * and largefile support turned on. 19 */ 20 21 22 /* Turn on large file support, has no effect on 64 bit archs */ 23 #define _FILE_OFFSET_BITS 64 24 25 #include <stdio.h> 26 #include <stdlib.h> 27 #include <unistd.h> 28 #include <limits.h> 29 #include <sys/mman.h> 30 #include <sys/types.h> 31 #include <sys/stat.h> 32 #include <sys/wait.h> 33 #include <fcntl.h> 34 #include <string.h> 35 #include <errno.h> 36 #include <sys/utsname.h> 37 #include "posixtest.h" 38 39 int main(void) 40 { 41 char tmpfname[256]; 42 43 void *pa; 44 size_t len; 45 int fd; 46 off_t off = 0; 47 48 /* check for 64 bit arch */ 49 if (sizeof(void *) == 8) { 50 printf("USUPPORTED: Cannot be tested on 64 bit architecture\n"); 51 return PTS_UNSUPPORTED; 52 } 53 54 /* The overflow does not happen when 32bit binary runs on 64bit kernel */ 55 #ifdef __linux__ 56 struct utsname buf; 57 58 if (!uname(&buf) && strstr(buf.machine, "64")) { 59 printf("UNSUPPORTED: Looks like we run on 64bit kernel (%s)\n", 60 buf.machine); 61 return PTS_UNSUPPORTED; 62 } 63 64 #endif /* __linux__ */ 65 66 long page_size = sysconf(_SC_PAGE_SIZE); 67 68 snprintf(tmpfname, sizeof(tmpfname), "/tmp/pts_mmap_31_1_%d", getpid()); 69 unlink(tmpfname); 70 fd = open(tmpfname, O_CREAT | O_RDWR | O_EXCL, S_IRUSR | S_IWUSR); 71 if (fd == -1) { 72 printf("Error at open(): %s\n", strerror(errno)); 73 return PTS_UNRESOLVED; 74 } 75 unlink(tmpfname); 76 77 /* Set lenght to maximal multiple of page size */ 78 len = ~((size_t) 0) & (~(page_size - 1)); 79 80 /* 81 * Now we need offset that fits into 32 bit 82 * value when divided by page size but is big 83 * enough so that offset + PAGE_ALIGN(len) / page_size 84 * overflows 32 bits. 85 */ 86 off = ((off_t) ~ ((size_t) 0)) * page_size; 87 off &= ~(page_size - 1); 88 89 printf("off: %llx, len: %llx\n", (unsigned long long)off, 90 (unsigned long long)len); 91 92 pa = mmap(NULL, len, PROT_READ | PROT_WRITE, MAP_SHARED, fd, off); 93 if (pa == MAP_FAILED && errno == EOVERFLOW) { 94 printf("Got EOVERFLOW\n"); 95 printf("Test PASSED\n"); 96 return PTS_PASS; 97 } 98 99 if (pa == MAP_FAILED) 100 perror("Test FAILED: expect EOVERFLOW but get other error"); 101 else 102 printf("Test FAILED: Expect EOVERFLOW but got no error\n"); 103 104 close(fd); 105 munmap(pa, len); 106 return PTS_FAIL; 107 } 108
