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80 lines
2.3 KiB
80 lines
2.3 KiB
7 months ago
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/* $OpenBSD: arc4random_linux.h,v 1.7 2014/07/20 20:51:13 bcook Exp $ */
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/*
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* Copyright (c) 1996, David Mazieres <dm@uun.org>
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* Copyright (c) 2008, Damien Miller <djm@openbsd.org>
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* Copyright (c) 2013, Markus Friedl <markus@openbsd.org>
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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/*
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* Stub functions for portability.
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*/
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#include <errno.h>
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#include <pthread.h>
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#include <signal.h>
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#include <sys/mman.h>
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#include <sys/prctl.h>
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#include <async_safe/log.h>
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// Android gets these from "thread_private.h".
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#include "thread_private.h"
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//static pthread_mutex_t arc4random_mtx = PTHREAD_MUTEX_INITIALIZER;
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//#define _ARC4_LOCK() pthread_mutex_lock(&arc4random_mtx)
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//#define _ARC4_UNLOCK() pthread_mutex_unlock(&arc4random_mtx)
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static inline void _getentropy_fail(void) {
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async_safe_fatal("getentropy failed: %s", strerror(errno));
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}
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volatile sig_atomic_t _rs_forked;
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static inline void
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_rs_forkdetect(void)
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{
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static pid_t _rs_pid = 0;
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pid_t pid = getpid();
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if (_rs_pid == 0 || _rs_pid != pid || _rs_forked) {
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_rs_pid = pid;
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_rs_forked = 0;
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if (rs)
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memset(rs, 0, sizeof(*rs));
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}
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}
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static inline int
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_rs_allocate(struct _rs **rsp, struct _rsx **rsxp)
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{
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// OpenBSD's arc4random_linux.h allocates two separate mappings, but for
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// themselves they just allocate both structs into one mapping like this.
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struct {
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struct _rs rs;
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struct _rsx rsx;
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} *p;
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if ((p = mmap(NULL, sizeof(*p), PROT_READ|PROT_WRITE,
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MAP_ANON|MAP_PRIVATE, -1, 0)) == MAP_FAILED)
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return (-1);
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prctl(PR_SET_VMA, PR_SET_VMA_ANON_NAME, p, sizeof(*p), "arc4random data");
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*rsp = &p->rs;
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*rsxp = &p->rsx;
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return (0);
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}
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