Branch data Line data Source code
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 *
48 : 3041 : xmmap(size_t size)
49 : : {
50 : : #ifdef HAVE_MMAP
51 : : void *address;
52 : :
53 : : # ifdef MAP_ANON
54 : 3041 : 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 [ - + ]: 3041 : if (address == (void *)MAP_FAILED) {
63 : 0 : char tmpname[sizeof(MM_SWAP_TEMPLATE)] = MM_SWAP_TEMPLATE;
64 : : int tmpfd;
65 : : mode_t old_umask;
66 : :
67 : 0 : old_umask = umask(0177);
68 : 0 : tmpfd = mkstemp(tmpname);
69 : 0 : umask(old_umask);
70 [ # # ]: 0 : if (tmpfd == -1)
71 : 0 : fatal("mkstemp(\"%s\"): %s",
72 : 0 : MM_SWAP_TEMPLATE, strerror(errno));
73 : 0 : unlink(tmpname);
74 [ # # ]: 0 : if (ftruncate(tmpfd, size) != 0)
75 : 0 : fatal("%s: ftruncate: %s", __func__, strerror(errno));
76 : 0 : address = mmap(NULL, size, PROT_WRITE|PROT_READ, MAP_SHARED,
77 : : tmpfd, (off_t)0);
78 : 0 : close(tmpfd);
79 : : }
80 : :
81 : 3041 : return (address);
82 : : #else
83 : : fatal("%s: UsePrivilegeSeparation=yes and Compression=yes not supported",
84 : : __func__);
85 : : #endif /* HAVE_MMAP */
86 : :
87 : : }
88 : :
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