1106121Sdes/* 2124208Sdes * Copyright (c) 2002 Tim Rice. All rights reserved. 3124208Sdes * MAP_FAILED code by Solar Designer. 4124208Sdes * 5106121Sdes * Redistribution and use in source and binary forms, with or without 6106121Sdes * modification, are permitted provided that the following conditions 7106121Sdes * are met: 8106121Sdes * 1. Redistributions of source code must retain the above copyright 9106121Sdes * notice, this list of conditions and the following disclaimer. 10106121Sdes * 2. Redistributions in binary form must reproduce the above copyright 11106121Sdes * notice, this list of conditions and the following disclaimer in the 12106121Sdes * documentation and/or other materials provided with the distribution. 13106121Sdes * 14106121Sdes * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 15106121Sdes * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 16106121Sdes * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 17106121Sdes * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 18106121Sdes * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 19106121Sdes * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 20106121Sdes * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 21106121Sdes * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 22106121Sdes * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 23106121Sdes * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 24106121Sdes */ 25106121Sdes 26192595Sdes/* $Id: xmmap.c,v 1.15 2009/02/16 04:21:40 djm Exp $ */ 27124208Sdes 28106121Sdes#include "includes.h" 29106121Sdes 30162852Sdes#include <sys/types.h> 31106121Sdes#ifdef HAVE_SYS_MMAN_H 32106121Sdes#include <sys/mman.h> 33106121Sdes#endif 34162852Sdes#include <sys/stat.h> 35106121Sdes 36162852Sdes#ifdef HAVE_FCNTL_H 37162852Sdes# include <fcntl.h> 38162852Sdes#endif 39162852Sdes#include <errno.h> 40162852Sdes#include <stdarg.h> 41181111Sdes#include <stdlib.h> 42162852Sdes#include <string.h> 43162852Sdes#include <unistd.h> 44162852Sdes 45106121Sdes#include "log.h" 46106121Sdes 47181111Sdesvoid * 48181111Sdesxmmap(size_t size) 49106121Sdes{ 50162852Sdes#ifdef HAVE_MMAP 51106121Sdes void *address; 52106121Sdes 53106121Sdes# ifdef MAP_ANON 54106121Sdes address = mmap(NULL, size, PROT_WRITE|PROT_READ, MAP_ANON|MAP_SHARED, 55137015Sdes -1, (off_t)0); 56106121Sdes# else 57106121Sdes address = mmap(NULL, size, PROT_WRITE|PROT_READ, MAP_SHARED, 58137015Sdes open("/dev/zero", O_RDWR), (off_t)0); 59106121Sdes# endif 60106121Sdes 61106121Sdes#define MM_SWAP_TEMPLATE "/var/run/sshd.mm.XXXXXXXX" 62146998Sdes if (address == (void *)MAP_FAILED) { 63106121Sdes char tmpname[sizeof(MM_SWAP_TEMPLATE)] = MM_SWAP_TEMPLATE; 64106121Sdes int tmpfd; 65137015Sdes mode_t old_umask; 66106121Sdes 67137015Sdes old_umask = umask(0177); 68106121Sdes tmpfd = mkstemp(tmpname); 69137015Sdes umask(old_umask); 70106121Sdes if (tmpfd == -1) 71106121Sdes fatal("mkstemp(\"%s\"): %s", 72106121Sdes MM_SWAP_TEMPLATE, strerror(errno)); 73106121Sdes unlink(tmpname); 74192595Sdes if (ftruncate(tmpfd, size) != 0) 75192595Sdes fatal("%s: ftruncate: %s", __func__, strerror(errno)); 76106121Sdes address = mmap(NULL, size, PROT_WRITE|PROT_READ, MAP_SHARED, 77137015Sdes tmpfd, (off_t)0); 78106121Sdes close(tmpfd); 79106121Sdes } 80106121Sdes 81106121Sdes return (address); 82106121Sdes#else 83106121Sdes fatal("%s: UsePrivilegeSeparation=yes and Compression=yes not supported", 84106121Sdes __func__); 85106121Sdes#endif /* HAVE_MMAP */ 86106121Sdes 87106121Sdes} 88106121Sdes 89