1 /* $OpenBSD: arc4random.h,v 1.4 2015/01/15 06:57:18 deraadt Exp $ */
2
3 /*
4 * Copyright (c) 1996, David Mazieres <[email protected]>
5 * Copyright (c) 2008, Damien Miller <[email protected]>
6 * Copyright (c) 2013, Markus Friedl <[email protected]>
7 * Copyright (c) 2014, Theo de Raadt <[email protected]>
8 *
9 * Permission to use, copy, modify, and distribute this software for any
10 * purpose with or without fee is hereby granted, provided that the above
11 * copyright notice and this permission notice appear in all copies.
12 *
13 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
14 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
15 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
16 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
17 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
18 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
19 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
20 *
21 * $FreeBSD$
22 */
23
24 /*
25 * Stub functions for portability.
26 */
27 #include <sys/mman.h>
28
29 #include <signal.h>
30
31 static pthread_mutex_t arc4random_mtx = PTHREAD_MUTEX_INITIALIZER;
32 #define _ARC4_LOCK() \
33 do { \
34 if (__isthreaded) \
35 _pthread_mutex_lock(&arc4random_mtx); \
36 } while (0)
37
38 #define _ARC4_UNLOCK() \
39 do { \
40 if (__isthreaded) \
41 _pthread_mutex_unlock(&arc4random_mtx); \
42 } while (0)
43
44 static inline void
_getentropy_fail(void)45 _getentropy_fail(void)
46 {
47 raise(SIGKILL);
48 }
49
50 static inline int
_rs_allocate(struct _rs ** rsp,struct _rsx ** rsxp)51 _rs_allocate(struct _rs **rsp, struct _rsx **rsxp)
52 {
53 struct {
54 struct _rs rs;
55 struct _rsx rsx;
56 } *p;
57
58 if ((p = mmap(NULL, sizeof(*p), PROT_READ|PROT_WRITE,
59 MAP_ANON|MAP_PRIVATE, -1, 0)) == MAP_FAILED)
60 return (-1);
61 if (minherit(p, sizeof(*p), INHERIT_ZERO) == -1) {
62 munmap(p, sizeof(*p));
63 return (-1);
64 }
65
66 *rsp = &p->rs;
67 *rsxp = &p->rsx;
68 return (0);
69 }
70
71 static inline void
_rs_forkdetect(void)72 _rs_forkdetect(void)
73 {
74 }
75