xmmap.c revision 106121
1106121Sdes/* 2106121Sdes * Redistribution and use in source and binary forms, with or without 3106121Sdes * modification, are permitted provided that the following conditions 4106121Sdes * are met: 5106121Sdes * 1. Redistributions of source code must retain the above copyright 6106121Sdes * notice, this list of conditions and the following disclaimer. 7106121Sdes * 2. Redistributions in binary form must reproduce the above copyright 8106121Sdes * notice, this list of conditions and the following disclaimer in the 9106121Sdes * documentation and/or other materials provided with the distribution. 10106121Sdes * 11106121Sdes * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 12106121Sdes * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 13106121Sdes * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 14106121Sdes * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 15106121Sdes * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 16106121Sdes * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 17106121Sdes * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 18106121Sdes * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 19106121Sdes * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 20106121Sdes * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 21106121Sdes */ 22106121Sdes 23106121Sdes#include "includes.h" 24106121Sdes 25106121Sdes#ifdef HAVE_SYS_MMAN_H 26106121Sdes#include <sys/mman.h> 27106121Sdes#endif 28106121Sdes 29106121Sdes#include "log.h" 30106121Sdes 31106121Sdesvoid *xmmap(size_t size) 32106121Sdes{ 33106121Sdes void *address; 34106121Sdes 35106121Sdes#ifdef HAVE_MMAP 36106121Sdes# ifdef MAP_ANON 37106121Sdes address = mmap(NULL, size, PROT_WRITE|PROT_READ, MAP_ANON|MAP_SHARED, 38106121Sdes -1, 0); 39106121Sdes# else 40106121Sdes address = mmap(NULL, size, PROT_WRITE|PROT_READ, MAP_SHARED, 41106121Sdes open("/dev/zero", O_RDWR), 0); 42106121Sdes# endif 43106121Sdes 44106121Sdes#define MM_SWAP_TEMPLATE "/var/run/sshd.mm.XXXXXXXX" 45106121Sdes if (address == MAP_FAILED) { 46106121Sdes char tmpname[sizeof(MM_SWAP_TEMPLATE)] = MM_SWAP_TEMPLATE; 47106121Sdes int tmpfd; 48106121Sdes 49106121Sdes tmpfd = mkstemp(tmpname); 50106121Sdes if (tmpfd == -1) 51106121Sdes fatal("mkstemp(\"%s\"): %s", 52106121Sdes MM_SWAP_TEMPLATE, strerror(errno)); 53106121Sdes unlink(tmpname); 54106121Sdes ftruncate(tmpfd, size); 55106121Sdes address = mmap(NULL, size, PROT_WRITE|PROT_READ, MAP_SHARED, 56106121Sdes tmpfd, 0); 57106121Sdes close(tmpfd); 58106121Sdes } 59106121Sdes 60106121Sdes return (address); 61106121Sdes#else 62106121Sdes fatal("%s: UsePrivilegeSeparation=yes and Compression=yes not supported", 63106121Sdes __func__); 64106121Sdes#endif /* HAVE_MMAP */ 65106121Sdes 66106121Sdes} 67106121Sdes 68