1 /*
2 * Copyright (c) 2002 Tim Rice. All rights reserved.
3 * MAP_FAILED code by Solar Designer.
4 *
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
26 /* $Id: xmmap.c,v 1.15 2009/02/16 04:21:40 djm Exp $ */
27
28 #include "includes.h"
29
30 #include <sys/types.h>
31 #ifdef HAVE_SYS_MMAN_H
32 #include <sys/mman.h>
33 #endif
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 <stdlib.h>
42 #include <string.h>
43 #include <unistd.h>
44
45 #include "log.h"
46
47 void *
xmmap(size_t size)48 xmmap(size_t size)
49 {
50 #ifdef HAVE_MMAP
51 void *address;
52
53 # ifdef MAP_ANON
54 address = mmap(NULL, size, PROT_WRITE|PROT_READ, MAP_ANON|MAP_SHARED,
55 -1, (off_t)0);
56 # else
57 address = mmap(NULL, size, PROT_WRITE|PROT_READ, MAP_SHARED,
58 open("/dev/zero", O_RDWR), (off_t)0);
59 # endif
60
61 #define MM_SWAP_TEMPLATE "/var/run/sshd.mm.XXXXXXXX"
62 if (address == (void *)MAP_FAILED) {
63 char tmpname[sizeof(MM_SWAP_TEMPLATE)] = MM_SWAP_TEMPLATE;
64 int tmpfd;
65 mode_t old_umask;
66
67 old_umask = umask(0177);
68 tmpfd = mkstemp(tmpname);
69 umask(old_umask);
70 if (tmpfd == -1)
71 fatal("mkstemp(\"%s\"): %s",
72 MM_SWAP_TEMPLATE, strerror(errno));
73 unlink(tmpname);
74 if (ftruncate(tmpfd, size) != 0)
75 fatal("%s: ftruncate: %s", __func__, strerror(errno));
76 address = mmap(NULL, size, PROT_WRITE|PROT_READ, MAP_SHARED,
77 tmpfd, (off_t)0);
78 close(tmpfd);
79 }
80
81 return (address);
82 #else
83 fatal("%s: UsePrivilegeSeparation=yes and Compression=yes not supported",
84 __func__);
85 #endif /* HAVE_MMAP */
86
87 }
88
89