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e54b3d7c | 1 | /* |
70791e56 | 2 | * Copyright (c) 2002 Tim Rice. All rights reserved. |
3 | * MAP_FAILED code by Solar Designer. | |
4 | * | |
e54b3d7c | 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 | ||
70791e56 | 26 | /* $Id$ */ |
27 | ||
e54b3d7c | 28 | #include "includes.h" |
29 | ||
30 | #ifdef HAVE_SYS_MMAN_H | |
31 | #include <sys/mman.h> | |
32 | #endif | |
33 | ||
34 | #include "log.h" | |
35 | ||
36 | void *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, | |
1b56ff3d | 43 | -1, (off_t)0); |
e54b3d7c | 44 | # else |
45 | address = mmap(NULL, size, PROT_WRITE|PROT_READ, MAP_SHARED, | |
1b56ff3d | 46 | open("/dev/zero", O_RDWR), (off_t)0); |
e54b3d7c | 47 | # endif |
48 | ||
49 | #define MM_SWAP_TEMPLATE "/var/run/sshd.mm.XXXXXXXX" | |
34fee935 | 50 | if (address == (void *)MAP_FAILED) { |
e54b3d7c | 51 | char tmpname[sizeof(MM_SWAP_TEMPLATE)] = MM_SWAP_TEMPLATE; |
52 | int tmpfd; | |
1b56ff3d | 53 | mode_t old_umask; |
e54b3d7c | 54 | |
1b56ff3d | 55 | old_umask = umask(0177); |
e54b3d7c | 56 | tmpfd = mkstemp(tmpname); |
1b56ff3d | 57 | umask(old_umask); |
e54b3d7c | 58 | 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, | |
1b56ff3d | 64 | tmpfd, (off_t)0); |
e54b3d7c | 65 | 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 |