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41b2f314 1/*
0fff78ff 2 * Copyright (c) 2002 Tim Rice. All rights reserved.
3 * MAP_FAILED code by Solar Designer.
4 *
41b2f314 5 * 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
0fff78ff 26/* $Id$ */
27
41b2f314 28#include "includes.h"
29
9108f8d9 30#include <sys/types.h>
41b2f314 31#ifdef HAVE_SYS_MMAN_H
32#include <sys/mman.h>
33#endif
9108f8d9 34#include <sys/stat.h>
35
36#ifdef HAVE_FCNTL_H
37# include <fcntl.h>
38#endif
39#include <errno.h>
40#include <stdarg.h>
41#include <string.h>
42#include <unistd.h>
41b2f314 43
44#include "log.h"
45
46void *xmmap(size_t size)
47{
9108f8d9 48#ifdef HAVE_MMAP
41b2f314 49 void *address;
50
41b2f314 51# ifdef MAP_ANON
52 address = mmap(NULL, size, PROT_WRITE|PROT_READ, MAP_ANON|MAP_SHARED,
c9f39d2c 53 -1, (off_t)0);
41b2f314 54# else
55 address = mmap(NULL, size, PROT_WRITE|PROT_READ, MAP_SHARED,
c9f39d2c 56 open("/dev/zero", O_RDWR), (off_t)0);
41b2f314 57# endif
58
59#define MM_SWAP_TEMPLATE "/var/run/sshd.mm.XXXXXXXX"
996d5e62 60 if (address == (void *)MAP_FAILED) {
41b2f314 61 char tmpname[sizeof(MM_SWAP_TEMPLATE)] = MM_SWAP_TEMPLATE;
62 int tmpfd;
c9f39d2c 63 mode_t old_umask;
41b2f314 64
c9f39d2c 65 old_umask = umask(0177);
41b2f314 66 tmpfd = mkstemp(tmpname);
c9f39d2c 67 umask(old_umask);
41b2f314 68 if (tmpfd == -1)
69 fatal("mkstemp(\"%s\"): %s",
70 MM_SWAP_TEMPLATE, strerror(errno));
71 unlink(tmpname);
72 ftruncate(tmpfd, size);
73 address = mmap(NULL, size, PROT_WRITE|PROT_READ, MAP_SHARED,
c9f39d2c 74 tmpfd, (off_t)0);
41b2f314 75 close(tmpfd);
76 }
77
78 return (address);
79#else
80 fatal("%s: UsePrivilegeSeparation=yes and Compression=yes not supported",
81 __func__);
82#endif /* HAVE_MMAP */
83
84}
85
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