1 /*
2 * Redistribution and use in source and binary forms, with or without
3 * modification, are permitted provided that the following conditions
4 * are met:
5 * 1. Redistributions of source code must retain the above copyright
6 * notice, this list of conditions and the following disclaimer.
7 * 2. Redistributions in binary form must reproduce the above copyright
8 * notice, this list of conditions and the following disclaimer in the
9 * documentation and/or other materials provided with the distribution.
10 *
11 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
12 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
13 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
14 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
15 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
16 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
17 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
18 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
19 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
20 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
21 */
22
23 #include "includes.h"
24
25 #ifdef HAVE_SYS_MMAN_H
26 #include <sys/mman.h>
27 #endif
28
29 #include "log.h"
30
xmmap(size_t size)31 void *xmmap(size_t size)
32 {
33 void *address;
34
35 #ifdef HAVE_MMAP
36 # ifdef MAP_ANON
37 address = mmap(NULL, size, PROT_WRITE|PROT_READ, MAP_ANON|MAP_SHARED,
38 -1, 0);
39 # else
40 address = mmap(NULL, size, PROT_WRITE|PROT_READ, MAP_SHARED,
41 open("/dev/zero", O_RDWR), 0);
42 # endif
43
44 #define MM_SWAP_TEMPLATE "/var/run/sshd.mm.XXXXXXXX"
45 if (address == MAP_FAILED) {
46 char tmpname[sizeof(MM_SWAP_TEMPLATE)] = MM_SWAP_TEMPLATE;
47 int tmpfd;
48
49 tmpfd = mkstemp(tmpname);
50 if (tmpfd == -1)
51 fatal("mkstemp(\"%s\"): %s",
52 MM_SWAP_TEMPLATE, strerror(errno));
53 unlink(tmpname);
54 ftruncate(tmpfd, size);
55 address = mmap(NULL, size, PROT_WRITE|PROT_READ, MAP_SHARED,
56 tmpfd, 0);
57 close(tmpfd);
58 }
59
60 return (address);
61 #else
62 fatal("%s: UsePrivilegeSeparation=yes and Compression=yes not supported",
63 __func__);
64 #endif /* HAVE_MMAP */
65
66 }
67
68
69 #pragma ident "%Z%%M% %I% %E% SMI"
70