@@ -0,0 +1,79 @@
/* $OpenBSD: arc4random_linux.h,v 1.12 2019/07/11 10:37:28 inoguchi Exp $ */

/*
* Copyright (c) 1996, David Mazieres <dm@uun.org>
* Copyright (c) 2008, Damien Miller <djm@openbsd.org>
* Copyright (c) 2013, Markus Friedl <markus@openbsd.org>
* Copyright (c) 2014, Theo de Raadt <deraadt@openbsd.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/

/*
* Stub functions for portability. From LibreSSL with some adaptations.
*/

#include <sys/mman.h>

#include <signal.h>

/* OpenSSH isn't multithreaded */
#define _ARC4_LOCK()
#define _ARC4_UNLOCK()
#define _ARC4_ATFORK(f)

static inline void
_getentropy_fail(void)
{
fatal("getentropy failed");
}

static volatile sig_atomic_t _rs_forked;

static inline void
_rs_forkhandler(void)
{
_rs_forked = 1;
}

static inline void
_rs_forkdetect(void)
{
static pid_t _rs_pid = 0;
pid_t pid = getpid();

if (_rs_pid == 0 || _rs_pid == 1 || _rs_pid != pid || _rs_forked) {
_rs_pid = pid;
_rs_forked = 0;
if (rs)
memset(rs, 0, sizeof(*rs));
}
}

static inline int
_rs_allocate(struct _rs **rsp, struct _rsx **rsxp)
{
if ((*rsp = mmap(NULL, sizeof(**rsp), PROT_READ|PROT_WRITE,
MAP_ANON|MAP_PRIVATE, -1, 0)) == MAP_FAILED)
return (-1);

if ((*rsxp = mmap(NULL, sizeof(**rsxp), PROT_READ|PROT_WRITE,
MAP_ANON|MAP_PRIVATE, -1, 0)) == MAP_FAILED) {
munmap(*rsp, sizeof(**rsp));
*rsp = NULL;
return (-1);
}

_ARC4_ATFORK(_rs_forkhandler);
return (0);
}
@@ -218,19 +218,18 @@ int writev(int, struct iovec *, int);
int getpeereid(int , uid_t *, gid_t *);
#endif

#ifdef HAVE_ARC4RANDOM
# ifndef HAVE_ARC4RANDOM_STIR
# define arc4random_stir()
# endif
#else
unsigned int arc4random(void);
void arc4random_stir(void);
#ifndef HAVE_ARC4RANDOM
uint32_t arc4random(void);
#endif /* !HAVE_ARC4RANDOM */

#ifndef HAVE_ARC4RANDOM_BUF
void arc4random_buf(void *, size_t);
#endif

#ifndef HAVE_ARC4RANDOM_STIR
# define arc4random_stir()
#endif

#ifndef HAVE_ARC4RANDOM_UNIFORM
uint32_t arc4random_uniform(uint32_t);
#endif