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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
130 lines
4.3 KiB
C
130 lines
4.3 KiB
C
/*-
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* Copyright (c) 2000-2015 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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* $FreeBSD$
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*/
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#ifndef SYS_DEV_RANDOM_RANDOMDEV_H_INCLUDED
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#define SYS_DEV_RANDOM_RANDOMDEV_H_INCLUDED
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#ifdef _KERNEL
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/* This header contains only those definitions that are global
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* and non algorithm-specific for the entropy processor
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*/
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#ifdef SYSCTL_DECL /* from sysctl.h */
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SYSCTL_DECL(_kern_random);
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#define RANDOM_CHECK_UINT(name, min, max) \
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static int \
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random_check_uint_##name(SYSCTL_HANDLER_ARGS) \
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{ \
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if (oidp->oid_arg1 != NULL) { \
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if (*(u_int *)(oidp->oid_arg1) <= (min)) \
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*(u_int *)(oidp->oid_arg1) = (min); \
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else if (*(u_int *)(oidp->oid_arg1) > (max)) \
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*(u_int *)(oidp->oid_arg1) = (max); \
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} \
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return (sysctl_handle_int(oidp, oidp->oid_arg1, oidp->oid_arg2, \
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req)); \
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}
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#endif /* SYSCTL_DECL */
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MALLOC_DECLARE(M_ENTROPY);
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#endif /* _KERNEL */
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struct harvest_event;
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typedef void random_alg_init_t(void *);
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typedef void random_alg_deinit_t(void *);
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typedef void random_alg_pre_read_t(void);
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typedef void random_alg_read_t(uint8_t *, u_int);
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typedef bool random_alg_seeded_t(void);
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typedef void random_alg_reseed_t(void);
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typedef void random_alg_eventprocessor_t(struct harvest_event *);
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typedef u_int random_source_read_t(void *, u_int);
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/*
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* Random Algorithm is a processor of randomness for the kernel
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* and for userland.
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*/
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struct random_algorithm {
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const char *ra_ident;
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u_int ra_poolcount;
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void (*ra_init_alg)(void *);
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void (*ra_deinit_alg)(void *);
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random_alg_pre_read_t *ra_pre_read;
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random_alg_read_t *ra_read;
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random_alg_seeded_t *ra_seeded;
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random_alg_eventprocessor_t *ra_event_processor;
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};
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extern struct random_algorithm random_alg_context, *p_random_alg_context;
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#ifdef _KERNEL
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/*
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* Random Source is a source of entropy that can provide
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* specified or approximate amount of entropy immediately
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* upon request.
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*/
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struct random_source {
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const char *rs_ident;
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enum random_entropy_source rs_source;
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random_source_read_t *rs_read;
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};
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struct random_sources {
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LIST_ENTRY(random_sources) rrs_entries;
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struct random_source *rrs_source;
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};
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LIST_HEAD(sources_head, random_sources);
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extern struct sources_head source_list;
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void random_source_register(struct random_source *);
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void random_source_deregister(struct random_source *);
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#if defined(RANDOM_LOADABLE)
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extern struct sx randomdev_config_lock;
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#define RANDOM_CONFIG_INIT_LOCK(x) sx_init(&randomdev_config_lock, "configuration change lock")
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#define RANDOM_CONFIG_X_LOCK(x) sx_xlock(&randomdev_config_lock)
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#define RANDOM_CONFIG_X_UNLOCK(x) sx_xunlock(&randomdev_config_lock)
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#define RANDOM_CONFIG_S_LOCK(x) sx_slock(&randomdev_config_lock)
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#define RANDOM_CONFIG_S_UNLOCK(x) sx_sunlock(&randomdev_config_lock)
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#define RANDOM_CONFIG_DEINIT_LOCK(x) sx_destroy(&randomdev_config_lock)
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void random_infra_init(int (*)(struct uio *, bool), void (*)(void *, u_int),
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bool (*)(void));
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void random_infra_uninit(void);
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#endif
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#endif /* _KERNEL */
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void randomdev_unblock(void);
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#endif /* SYS_DEV_RANDOM_RANDOMDEV_H_INCLUDED */
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