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f3d2512db6
The imagined use is for early boot consumers of random to be able to make decisions based on whether random is available yet or not. One such consumer seems to be __stack_chk_init(), which runs immediately after random is initialized. A follow-up patch will attempt to address that. Reported by: many Reviewed by: delphij (except man page) Approved by: secteam(delphij) Differential Revision: https://reviews.freebsd.org/D19926
153 lines
4.2 KiB
C
153 lines
4.2 KiB
C
/*-
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* Copyright (c) 2015 Mark R V Murray
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer
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* in this position and unchanged.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/kernel.h>
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#include <sys/malloc.h>
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#include <sys/random.h>
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#include <sys/sysctl.h>
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#if defined(RANDOM_LOADABLE)
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#include <sys/lock.h>
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#include <sys/sx.h>
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#endif
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#include <dev/random/randomdev.h>
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/* Set up the sysctl root node for the entropy device */
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SYSCTL_NODE(_kern, OID_AUTO, random, CTLFLAG_RW, 0, "Cryptographically Secure Random Number Generator");
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MALLOC_DEFINE(M_ENTROPY, "entropy", "Entropy harvesting buffers and data structures");
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struct sources_head source_list = LIST_HEAD_INITIALIZER(source_list);
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#if defined(RANDOM_LOADABLE)
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struct random_algorithm *p_random_alg_context = NULL;
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#else /* !defined(RANDOM_LOADABLE) */
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struct random_algorithm *p_random_alg_context = &random_alg_context;
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#endif /* defined(RANDOM_LOADABLE) */
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#if defined(RANDOM_LOADABLE)
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static void
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null_read_random(void *dummy __unused, u_int dummy2 __unused)
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{
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panic("%s: no random module is loaded", __func__);
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}
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static bool
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null_is_random_seeded(void)
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{
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return (false);
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}
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struct random_readers {
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int (*read_random_uio)(struct uio *, bool);
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void (*read_random)(void *, u_int);
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bool (*is_random_seeded)(void);
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} random_reader_context = {
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(int (*)(struct uio *, bool))nullop,
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null_read_random,
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null_is_random_seeded,
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};
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struct sx randomdev_config_lock;
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static void
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random_infra_sysinit(void *dummy __unused)
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{
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RANDOM_CONFIG_INIT_LOCK();
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}
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SYSINIT(random_device_h_init, SI_SUB_RANDOM, SI_ORDER_FIRST, random_infra_sysinit, NULL);
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void
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random_infra_init(int (*p_random_read_uio)(struct uio *, bool),
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void (*p_random_read)(void *, u_int),
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bool (*p_is_random_seeded)(void))
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{
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RANDOM_CONFIG_X_LOCK();
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random_reader_context.read_random_uio = p_random_read_uio;
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random_reader_context.read_random = p_random_read;
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random_reader_context.is_random_seeded = p_is_random_seeded;
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RANDOM_CONFIG_X_UNLOCK();
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}
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void
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random_infra_uninit(void)
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{
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RANDOM_CONFIG_X_LOCK();
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random_reader_context.read_random_uio = (int (*)(struct uio *, bool))nullop;
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random_reader_context.read_random = null_read_random;
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random_reader_context.is_random_seeded = null_is_random_seeded;
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RANDOM_CONFIG_X_UNLOCK();
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}
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static void
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random_infra_sysuninit(void *dummy __unused)
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{
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RANDOM_CONFIG_DEINIT_LOCK();
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}
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SYSUNINIT(random_device_h_init, SI_SUB_RANDOM, SI_ORDER_FIRST, random_infra_sysuninit, NULL);
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int
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read_random_uio(struct uio *uio, bool nonblock)
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{
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int retval;
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RANDOM_CONFIG_S_LOCK();
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retval = random_reader_context.read_random_uio(uio, nonblock);
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RANDOM_CONFIG_S_UNLOCK();
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return (retval);
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}
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void
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read_random(void *buf, u_int len)
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{
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RANDOM_CONFIG_S_LOCK();
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random_reader_context.read_random(buf, len);
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RANDOM_CONFIG_S_UNLOCK();
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}
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bool
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is_random_seeded(void)
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{
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RANDOM_CONFIG_S_LOCK();
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random_reader_context.is_random_seeded();
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RANDOM_CONFIG_S_UNLOCK();
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}
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#endif /* defined(RANDOM_LOADABLE) */
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