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