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