11305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood/* 21305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood * Copyright (c) 2002 Tim Rice. All rights reserved. 31305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood * MAP_FAILED code by Solar Designer. 41305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood * 51305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood * Redistribution and use in source and binary forms, with or without 61305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood * modification, are permitted provided that the following conditions 71305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood * are met: 81305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood * 1. Redistributions of source code must retain the above copyright 91305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood * notice, this list of conditions and the following disclaimer. 101305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood * 2. Redistributions in binary form must reproduce the above copyright 111305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood * notice, this list of conditions and the following disclaimer in the 121305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood * documentation and/or other materials provided with the distribution. 131305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood * 141305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 151305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 161305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 171305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 181305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 191305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 201305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 211305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 221305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 231305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 241305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood */ 251305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood 261305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood/* $Id: xmmap.c,v 1.15 2009/02/16 04:21:40 djm Exp $ */ 271305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood 281305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood#include "includes.h" 291305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood 301305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood#include <sys/types.h> 311305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood#ifdef HAVE_SYS_MMAN_H 321305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood#include <sys/mman.h> 331305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood#endif 341305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood#include <sys/stat.h> 351305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood 361305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood#ifdef HAVE_FCNTL_H 371305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood# include <fcntl.h> 381305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood#endif 391305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood#include <errno.h> 401305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood#include <stdarg.h> 411305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood#include <stdlib.h> 421305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood#include <string.h> 431305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood#include <unistd.h> 441305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood 451305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood#include "log.h" 461305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood 471305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwoodvoid * 481305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwoodxmmap(size_t size) 491305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood{ 501305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood#ifdef HAVE_MMAP 511305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood void *address; 521305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood 531305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood# ifdef MAP_ANON 541305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood address = mmap(NULL, size, PROT_WRITE|PROT_READ, MAP_ANON|MAP_SHARED, 551305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood -1, (off_t)0); 561305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood# else 571305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood address = mmap(NULL, size, PROT_WRITE|PROT_READ, MAP_SHARED, 581305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood open("/dev/zero", O_RDWR), (off_t)0); 591305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood# endif 601305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood 611305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood#define MM_SWAP_TEMPLATE "/var/run/sshd.mm.XXXXXXXX" 621305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood if (address == (void *)MAP_FAILED) { 631305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood char tmpname[sizeof(MM_SWAP_TEMPLATE)] = MM_SWAP_TEMPLATE; 641305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood int tmpfd; 651305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood mode_t old_umask; 661305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood 671305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood old_umask = umask(0177); 681305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood tmpfd = mkstemp(tmpname); 691305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood umask(old_umask); 701305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood if (tmpfd == -1) 711305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood fatal("mkstemp(\"%s\"): %s", 721305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood MM_SWAP_TEMPLATE, strerror(errno)); 731305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood unlink(tmpname); 741305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood if (ftruncate(tmpfd, size) != 0) 751305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood fatal("%s: ftruncate: %s", __func__, strerror(errno)); 761305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood address = mmap(NULL, size, PROT_WRITE|PROT_READ, MAP_SHARED, 771305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood tmpfd, (off_t)0); 781305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood close(tmpfd); 791305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood } 801305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood 811305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood return (address); 821305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood#else 831305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood fatal("%s: UsePrivilegeSeparation=yes and Compression=yes not supported", 841305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood __func__); 851305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood#endif /* HAVE_MMAP */ 861305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood 871305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood} 881305e95ba6ff9fa202d0818caf10405df4b0f648Mike Lockwood 89