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/* $OpenBSD: arc4random_linux.h,v 1.12 2019/07/11 10:37:28 inoguchi 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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* Copyright (c) 2014, Theo de Raadt <deraadt@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. From LibreSSL with some adaptations. |
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*/ |
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#include <sys/mman.h> |
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#include <signal.h> |
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/* OpenSSH isn't multithreaded */ |
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#define _ARC4_LOCK() |
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#define _ARC4_UNLOCK() |
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#define _ARC4_ATFORK(f) |
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static inline void |
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_getentropy_fail(void) |
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{ |
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fatal("getentropy failed"); |
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} |
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static volatile sig_atomic_t _rs_forked; |
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static inline void |
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_rs_forkhandler(void) |
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{ |
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_rs_forked = 1; |
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} |
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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 == 1 || _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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if ((*rsp = mmap(NULL, sizeof(**rsp), 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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if ((*rsxp = mmap(NULL, sizeof(**rsxp), PROT_READ|PROT_WRITE, |
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MAP_ANON|MAP_PRIVATE, -1, 0)) == MAP_FAILED) { |
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munmap(*rsp, sizeof(**rsp)); |
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*rsp = NULL; |
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return (-1); |
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} |
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_ARC4_ATFORK(_rs_forkhandler); |
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return (0); |
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} |