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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 | /* $Id$ */ | |
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 | 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 |