b136eed630
Pass the pointy hat please.
Also unblock the software (Yarrow) generator for now. This will be
reverted; Yarrow needs to block until secure, not this behaviour
of serving as soon as asked.
Folks with specific requiremnts will be able to (can!) unblock this
device with any write, and are encouraged to do so in /etc/rc.d/*
scripting. ("Any" in this case could be "echo '' > /dev/random" as
root).
126 lines
3.4 KiB
C
126 lines
3.4 KiB
C
/*-
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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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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/time.h>
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#include <sys/kernel.h>
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#include <sys/module.h>
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#include <sys/selinfo.h>
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#include <sys/systm.h>
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#include <dev/random/random_adaptors.h>
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#include <dev/random/randomdev.h>
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static struct mtx pseudo_random_block_mtx;
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/* Used to fake out unused random calls in random_adaptor */
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void
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random_null_func(void)
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{
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}
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static int
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pseudo_random_block_read(void *buf __unused, int c __unused)
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{
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mtx_lock(&pseudo_random_block_mtx);
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printf("random(4) device is blocking.\n");
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msleep(pseudo_random_block_read, &pseudo_random_block_mtx, 0,
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"block", 0);
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mtx_unlock(&pseudo_random_block_mtx);
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return (0);
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}
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static void
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pseudo_random_block_init(void)
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{
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mtx_init(&pseudo_random_block_mtx, "sleep mtx for random_block",
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NULL, MTX_DEF);
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}
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static void
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pseudo_random_block_deinit(void)
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{
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mtx_destroy(&pseudo_random_block_mtx);
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}
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struct random_adaptor pseudo_random_block = {
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.ident = "pseudo-RNG that always blocks",
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.init = pseudo_random_block_init,
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.deinit = pseudo_random_block_deinit,
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.read = pseudo_random_block_read,
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.write = (random_write_func_t *)random_null_func,
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.reseed = (random_reseed_func_t *)random_null_func,
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.seeded = 1,
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};
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static int
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pseudo_random_panic_read(void *buf, int c)
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{
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panic("Insert a witty panic msg in here.");
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return (0);
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}
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struct random_adaptor pseudo_random_panic = {
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.ident = "pseudo-RNG that always panics on first read(2)",
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.init = (random_init_func_t *)random_null_func,
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.deinit = (random_deinit_func_t *)random_null_func,
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.read = pseudo_random_panic_read,
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.write = (random_write_func_t *)random_null_func,
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.reseed = (random_reseed_func_t *)random_null_func,
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.seeded = 1,
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};
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static int
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pseudo_random_modevent(module_t mod, int type, void *unused)
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{
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switch (type) {
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case MOD_LOAD:
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random_adaptor_register("block", &pseudo_random_block);
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EVENTHANDLER_INVOKE(random_adaptor_attach,
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&pseudo_random_block);
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random_adaptor_register("panic", &pseudo_random_panic);
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return (0);
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}
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return (EINVAL);
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}
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RANDOM_ADAPTOR_MODULE(pseudo, pseudo_random_modevent, 1);
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