1*c1e80940SXin LI /* $OpenBSD: arc4random.h,v 1.4 2015/01/15 06:57:18 deraadt Exp $ */ 2*c1e80940SXin LI 3*c1e80940SXin LI /* 4*c1e80940SXin LI * Copyright (c) 1996, David Mazieres <dm@uun.org> 5*c1e80940SXin LI * Copyright (c) 2008, Damien Miller <djm@openbsd.org> 6*c1e80940SXin LI * Copyright (c) 2013, Markus Friedl <markus@openbsd.org> 7*c1e80940SXin LI * Copyright (c) 2014, Theo de Raadt <deraadt@openbsd.org> 8*c1e80940SXin LI * 9*c1e80940SXin LI * Permission to use, copy, modify, and distribute this software for any 10*c1e80940SXin LI * purpose with or without fee is hereby granted, provided that the above 11*c1e80940SXin LI * copyright notice and this permission notice appear in all copies. 12*c1e80940SXin LI * 13*c1e80940SXin LI * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 14*c1e80940SXin LI * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 15*c1e80940SXin LI * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 16*c1e80940SXin LI * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 17*c1e80940SXin LI * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 18*c1e80940SXin LI * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 19*c1e80940SXin LI * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 20*c1e80940SXin LI * 21*c1e80940SXin LI * $FreeBSD$ 22*c1e80940SXin LI */ 23*c1e80940SXin LI 24*c1e80940SXin LI /* 25*c1e80940SXin LI * Stub functions for portability. 26*c1e80940SXin LI */ 27*c1e80940SXin LI #include <sys/mman.h> 28*c1e80940SXin LI 29*c1e80940SXin LI #include <signal.h> 30*c1e80940SXin LI 31*c1e80940SXin LI static pthread_mutex_t arc4random_mtx = PTHREAD_MUTEX_INITIALIZER; 32*c1e80940SXin LI #define _ARC4_LOCK() \ 33*c1e80940SXin LI do { \ 34*c1e80940SXin LI if (__isthreaded) \ 35*c1e80940SXin LI _pthread_mutex_lock(&arc4random_mtx); \ 36*c1e80940SXin LI } while (0) 37*c1e80940SXin LI 38*c1e80940SXin LI #define _ARC4_UNLOCK() \ 39*c1e80940SXin LI do { \ 40*c1e80940SXin LI if (__isthreaded) \ 41*c1e80940SXin LI _pthread_mutex_unlock(&arc4random_mtx); \ 42*c1e80940SXin LI } while (0) 43*c1e80940SXin LI 44*c1e80940SXin LI static inline void 45*c1e80940SXin LI _getentropy_fail(void) 46*c1e80940SXin LI { 47*c1e80940SXin LI raise(SIGKILL); 48*c1e80940SXin LI } 49*c1e80940SXin LI 50*c1e80940SXin LI static inline int 51*c1e80940SXin LI _rs_allocate(struct _rs **rsp, struct _rsx **rsxp) 52*c1e80940SXin LI { 53*c1e80940SXin LI struct { 54*c1e80940SXin LI struct _rs rs; 55*c1e80940SXin LI struct _rsx rsx; 56*c1e80940SXin LI } *p; 57*c1e80940SXin LI 58*c1e80940SXin LI if ((p = mmap(NULL, sizeof(*p), PROT_READ|PROT_WRITE, 59*c1e80940SXin LI MAP_ANON|MAP_PRIVATE, -1, 0)) == MAP_FAILED) 60*c1e80940SXin LI return (-1); 61*c1e80940SXin LI if (minherit(p, sizeof(*p), INHERIT_ZERO) == -1) { 62*c1e80940SXin LI munmap(p, sizeof(*p)); 63*c1e80940SXin LI return (-1); 64*c1e80940SXin LI } 65*c1e80940SXin LI 66*c1e80940SXin LI *rsp = &p->rs; 67*c1e80940SXin LI *rsxp = &p->rsx; 68*c1e80940SXin LI return (0); 69*c1e80940SXin LI } 70*c1e80940SXin LI 71*c1e80940SXin LI static inline void 72*c1e80940SXin LI _rs_forkdetect(void) 73*c1e80940SXin LI { 74*c1e80940SXin LI } 75