1 /* 2 * Copyright (c) 2002 Tim Rice. All rights reserved. 3 * MAP_FAILED code by Solar Designer. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 15 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 16 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 17 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 18 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 19 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 20 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 21 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 23 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 24 */ 25 26 /* $Id: xmmap.c,v 1.15 2009/02/16 04:21:40 djm Exp $ */ 27 28 #include "includes.h" 29 30 #include <sys/types.h> 31 #ifdef HAVE_SYS_MMAN_H 32 #include <sys/mman.h> 33 #endif 34 #include <sys/stat.h> 35 36 #ifdef HAVE_FCNTL_H 37 # include <fcntl.h> 38 #endif 39 #include <errno.h> 40 #include <stdarg.h> 41 #include <stdlib.h> 42 #include <string.h> 43 #include <unistd.h> 44 45 #include "log.h" 46 47 void * 48 xmmap(size_t size) 49 { 50 #ifdef HAVE_MMAP 51 void *address; 52 53 # ifdef MAP_ANON 54 address = mmap(NULL, size, PROT_WRITE|PROT_READ, MAP_ANON|MAP_SHARED, 55 -1, (off_t)0); 56 # else 57 address = mmap(NULL, size, PROT_WRITE|PROT_READ, MAP_SHARED, 58 open("/dev/zero", O_RDWR), (off_t)0); 59 # endif 60 61 #define MM_SWAP_TEMPLATE "/var/run/sshd.mm.XXXXXXXX" 62 if (address == (void *)MAP_FAILED) { 63 char tmpname[sizeof(MM_SWAP_TEMPLATE)] = MM_SWAP_TEMPLATE; 64 int tmpfd; 65 mode_t old_umask; 66 67 old_umask = umask(0177); 68 tmpfd = mkstemp(tmpname); 69 umask(old_umask); 70 if (tmpfd == -1) 71 fatal("mkstemp(\"%s\"): %s", 72 MM_SWAP_TEMPLATE, strerror(errno)); 73 unlink(tmpname); 74 if (ftruncate(tmpfd, size) != 0) 75 fatal("%s: ftruncate: %s", __func__, strerror(errno)); 76 address = mmap(NULL, size, PROT_WRITE|PROT_READ, MAP_SHARED, 77 tmpfd, (off_t)0); 78 close(tmpfd); 79 } 80 81 return (address); 82 #else 83 fatal("%s: UsePrivilegeSeparation=yes and Compression=yes not supported", 84 __func__); 85 #endif /* HAVE_MMAP */ 86 87 } 88 89
