blob: 74e8a8b13765ac9bd5cc1f37fc2b59c79396b041 [file] [log] [blame]
Tim Rice40017b02002-07-14 13:36:49 -07001/*
Tim Rice237ca4a2003-06-01 19:25:27 -07002 * Copyright (c) 2002 Tim Rice. All rights reserved.
3 * MAP_FAILED code by Solar Designer.
4 *
Tim Rice40017b02002-07-14 13:36:49 -07005 * 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
Darren Tuckerdbc22962004-10-06 23:15:44 +100026/* $Id: xmmap.c,v 1.6 2004/10/06 13:15:44 dtucker Exp $ */
Tim Rice237ca4a2003-06-01 19:25:27 -070027
Tim Rice40017b02002-07-14 13:36:49 -070028#include "includes.h"
29
30#ifdef HAVE_SYS_MMAN_H
31#include <sys/mman.h>
32#endif
33
Kevin Steves066e1ab2002-07-22 16:20:29 +000034#include "log.h"
35
Tim Rice40017b02002-07-14 13:36:49 -070036void *xmmap(size_t size)
37{
38 void *address;
39
40#ifdef HAVE_MMAP
41# ifdef MAP_ANON
42 address = mmap(NULL, size, PROT_WRITE|PROT_READ, MAP_ANON|MAP_SHARED,
Darren Tucker1f8311c2004-05-13 16:39:33 +100043 -1, (off_t)0);
Tim Rice40017b02002-07-14 13:36:49 -070044# else
45 address = mmap(NULL, size, PROT_WRITE|PROT_READ, MAP_SHARED,
Darren Tucker1f8311c2004-05-13 16:39:33 +100046 open("/dev/zero", O_RDWR), (off_t)0);
Tim Rice40017b02002-07-14 13:36:49 -070047# endif
48
49#define MM_SWAP_TEMPLATE "/var/run/sshd.mm.XXXXXXXX"
Darren Tuckerdbc22962004-10-06 23:15:44 +100050 if (address == (void *)MAP_FAILED) {
Tim Rice40017b02002-07-14 13:36:49 -070051 char tmpname[sizeof(MM_SWAP_TEMPLATE)] = MM_SWAP_TEMPLATE;
52 int tmpfd;
Darren Tucker06696932004-08-14 23:55:37 +100053 mode_t old_umask;
Tim Rice40017b02002-07-14 13:36:49 -070054
Darren Tucker06696932004-08-14 23:55:37 +100055 old_umask = umask(0177);
Tim Rice40017b02002-07-14 13:36:49 -070056 tmpfd = mkstemp(tmpname);
Darren Tucker06696932004-08-14 23:55:37 +100057 umask(old_umask);
Tim Rice40017b02002-07-14 13:36:49 -070058 if (tmpfd == -1)
59 fatal("mkstemp(\"%s\"): %s",
60 MM_SWAP_TEMPLATE, strerror(errno));
61 unlink(tmpname);
62 ftruncate(tmpfd, size);
63 address = mmap(NULL, size, PROT_WRITE|PROT_READ, MAP_SHARED,
Darren Tucker1f8311c2004-05-13 16:39:33 +100064 tmpfd, (off_t)0);
Tim Rice40017b02002-07-14 13:36:49 -070065 close(tmpfd);
66 }
67
68 return (address);
69#else
70 fatal("%s: UsePrivilegeSeparation=yes and Compression=yes not supported",
71 __func__);
72#endif /* HAVE_MMAP */
73
74}
75