48e279eaa7
- Remove duplicated sources between standard part of the kernel and module. In particular, it caused duplicated lock initialization and sysctl registration, both having bad consequences. - Add missed source files to module. - Static part of the kernel provides randomdev module, not random_adaptors. Correct dependencies. - Use cdev modules declaration macros. Approved by: secteam (delphij) Reviewed by: markm
245 lines
6.3 KiB
C
245 lines
6.3 KiB
C
/*-
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* Copyright (c) 2000-2013 Mark R V Murray
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* Copyright (c) 2013 Arthur Mesh <arthurmesh@gmail.com>
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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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/*
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* NOTE NOTE NOTE
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*
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* This file is compiled into the kernel unconditionally. Any random(4)
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* infrastructure that needs to be in the kernel by default goes here!
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*
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* Except ...
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*
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* The adaptor code all goes into random_adaptor.c, which is also compiled
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* the kernel by default. The module in that file is initialised before
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* this one.
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*
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* Other modules must be initialised after the above two, and are
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* software random processors which plug into random_adaptor.c.
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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 "opt_random.h"
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/bus.h>
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#include <sys/conf.h>
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#include <sys/fcntl.h>
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#include <sys/filio.h>
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#include <sys/kernel.h>
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#include <sys/kthread.h>
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#include <sys/lock.h>
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#include <sys/module.h>
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#include <sys/malloc.h>
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#include <sys/proc.h>
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#include <sys/random.h>
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#include <sys/sysctl.h>
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#include <sys/systm.h>
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#include <sys/uio.h>
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#include <sys/unistd.h>
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#include <dev/random/randomdev.h>
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#include <dev/random/random_adaptors.h>
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#include <dev/random/random_harvestq.h>
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#define RANDOM_MINOR 0
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static d_ioctl_t randomdev_ioctl;
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static struct cdevsw random_cdevsw = {
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.d_name = "random",
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.d_version = D_VERSION,
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.d_read = random_adaptor_read,
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.d_write = random_adaptor_write,
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.d_poll = random_adaptor_poll,
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.d_ioctl = randomdev_ioctl,
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};
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/* For use with make_dev(9)/destroy_dev(9). */
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static struct cdev *random_dev;
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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, "Random Number Generator");
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MALLOC_DEFINE(M_ENTROPY, "entropy", "Entropy harvesting buffers and data structures");
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/* ARGSUSED */
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static int
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randomdev_ioctl(struct cdev *dev __unused, u_long cmd, caddr_t addr __unused,
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int flags __unused, struct thread *td __unused)
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{
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int error = 0;
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switch (cmd) {
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/* Really handled in upper layer */
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case FIOASYNC:
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case FIONBIO:
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break;
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default:
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error = ENOTTY;
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}
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return (error);
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}
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/* Helper routine to enable kproc_exit() to work while the module is
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* being (or has been) unloaded.
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* This routine is in this file because it is always linked into the kernel,
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* and will thus never be unloaded. This is critical for unloadable modules
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* that have threads.
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*/
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void
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randomdev_set_wakeup_exit(void *control)
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{
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wakeup(control);
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kproc_exit(0);
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/* NOTREACHED */
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}
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/* ARGSUSED */
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static int
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randomdev_modevent(module_t mod __unused, int type, void *data __unused)
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{
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int error = 0;
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switch (type) {
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case MOD_LOAD:
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printf("random: entropy device infrastructure driver\n");
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random_dev = make_dev_credf(MAKEDEV_ETERNAL_KLD, &random_cdevsw,
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RANDOM_MINOR, NULL, UID_ROOT, GID_WHEEL, 0644, "random");
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make_dev_alias(random_dev, "urandom"); /* compatibility */
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random_adaptors_init();
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break;
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case MOD_UNLOAD:
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random_adaptors_deinit();
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destroy_dev(random_dev);
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break;
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case MOD_SHUTDOWN:
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break;
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default:
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error = EOPNOTSUPP;
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break;
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}
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return (error);
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}
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DEV_MODULE_ORDERED(randomdev, randomdev_modevent, NULL, SI_ORDER_SECOND);
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MODULE_VERSION(randomdev, 1);
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/* ================
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* Harvesting stubs
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* ================
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*/
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/* Internal stub/fake routine for when no entropy processor is loaded.
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* If the entropy device is not loaded, don't act on harvesting calls
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* and just return.
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*/
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/* ARGSUSED */
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static void
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random_harvest_phony(const void *entropy __unused, u_int count __unused,
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u_int bits __unused, enum random_entropy_source origin __unused)
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{
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}
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/* Hold the address of the routine which is actually called */
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static void (*reap_func)(const void *, u_int, u_int, enum random_entropy_source) = random_harvest_phony;
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/* Initialise the harvester when/if it is loaded */
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void
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randomdev_init_harvester(void (*reaper)(const void *, u_int, u_int, enum random_entropy_source))
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{
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reap_func = reaper;
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}
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/* Deinitialise the harvester when/if it is unloaded */
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void
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randomdev_deinit_harvester(void)
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{
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reap_func = random_harvest_phony;
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}
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/* Entropy harvesting routine.
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* Implemented as in indirect call to allow non-inclusion of
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* the entropy device.
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*/
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void
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random_harvest(const void *entropy, u_int count, u_int bits, enum random_entropy_source origin)
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{
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(*reap_func)(entropy, count, bits, origin);
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}
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/* ================================
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* Internal reading stubs and fakes
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* ================================
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*/
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/* Hold the address of the routine which is actually called */
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static u_int (*read_func)(uint8_t *, u_int) = dummy_random_read_phony;
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/* Initialise the reader when/if it is loaded */
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void
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randomdev_init_reader(u_int (*reader)(uint8_t *, u_int))
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{
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read_func = reader;
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}
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/* Deinitialise the reader when/if it is unloaded */
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void
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randomdev_deinit_reader(void)
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{
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read_func = dummy_random_read_phony;
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}
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/* Kernel API version of read_random().
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* Implemented as in indirect call to allow non-inclusion of
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* the entropy device.
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*/
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int
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read_random(void *buf, int count)
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{
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return ((int)(*read_func)(buf, (u_int)count));
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}
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