1 /* $OpenBSD: arc4random_linux.h,v 1.12 2019/07/11 10:37:28 inoguchi Exp $ */
4 * Copyright (c) 1996, David Mazieres <dm@uun.org>
5 * Copyright (c) 2008, Damien Miller <djm@openbsd.org>
6 * Copyright (c) 2013, Markus Friedl <markus@openbsd.org>
7 * Copyright (c) 2014, Theo de Raadt <deraadt@openbsd.org>
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.
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.
23 * Stub functions for portability. From LibreSSL with some adaptations.
30 /* OpenSSH isn't multithreaded */
32 #define _ARC4_UNLOCK()
33 #define _ARC4_ATFORK(f)
36 _getentropy_fail(void)
38 fatal("getentropy failed");
41 static volatile sig_atomic_t _rs_forked;
52 static pid_t _rs_pid = 0;
55 if (_rs_pid == 0 || _rs_pid == 1 || _rs_pid != pid || _rs_forked) {
59 memset(rs, 0, sizeof(*rs));
64 _rs_allocate(struct _rs **rsp, struct _rsx **rsxp)
66 #if defined(MAP_ANON) && defined(MAP_PRIVATE)
67 if ((*rsp = mmap(NULL, sizeof(**rsp), PROT_READ|PROT_WRITE,
68 MAP_ANON|MAP_PRIVATE, -1, 0)) == MAP_FAILED)
71 if ((*rsxp = mmap(NULL, sizeof(**rsxp), PROT_READ|PROT_WRITE,
72 MAP_ANON|MAP_PRIVATE, -1, 0)) == MAP_FAILED) {
73 munmap(*rsp, sizeof(**rsp));
78 if ((*rsp = calloc(1, sizeof(**rsp))) == NULL)
80 if ((*rsxp = calloc(1, sizeof(**rsxp))) == NULL) {
87 _ARC4_ATFORK(_rs_forkhandler);