b9887f5053
o Allow this to work with "nodevice random" by fixing where the MALLOC pool is defined. o Fix the explicit reseed code. This was correct as submitted, but in the project branch doesn't need to set the "seeded" bit as this is done correctly in the "unblock" function. o Remove some debug ifdeffing. o Adjust comments.
145 lines
3.6 KiB
C
145 lines
3.6 KiB
C
/*-
|
|
* Copyright (c) 2013 David E. O'Brien <obrien@NUXI.org>
|
|
* Copyright (c) 2012 Konstantin Belousov <kib@FreeBSD.org>
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer
|
|
* in this position and unchanged.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
|
|
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
|
|
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
|
|
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
|
|
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
|
|
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
|
|
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
|
|
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
|
|
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
|
|
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
*
|
|
*/
|
|
|
|
#include <sys/cdefs.h>
|
|
__FBSDID("$FreeBSD$");
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/kernel.h>
|
|
#include <sys/lock.h>
|
|
#include <sys/malloc.h>
|
|
#include <sys/module.h>
|
|
#include <sys/random.h>
|
|
#include <sys/selinfo.h>
|
|
#include <sys/systm.h>
|
|
|
|
#include <machine/md_var.h>
|
|
#include <machine/specialreg.h>
|
|
|
|
#include <dev/random/randomdev.h>
|
|
#include <dev/random/randomdev_soft.h>
|
|
#include <dev/random/random_harvestq.h>
|
|
#include <dev/random/live_entropy_sources.h>
|
|
#include <dev/random/random_adaptors.h>
|
|
|
|
#define RETRY_COUNT 10
|
|
|
|
static int random_ivy_read(void *, int);
|
|
|
|
struct random_hardware_source random_ivy = {
|
|
.ident = "Hardware, Intel IvyBridge+ RNG",
|
|
.source = RANDOM_PURE_RDRAND,
|
|
.read = random_ivy_read
|
|
};
|
|
|
|
static inline int
|
|
ivy_rng_store(uint64_t *tmp)
|
|
{
|
|
#ifdef __GNUCLIKE_ASM
|
|
uint32_t count;
|
|
|
|
__asm __volatile(
|
|
#ifdef __amd64__
|
|
"rdrand\t%%rax\n\t"
|
|
"jnc\t1f\n\t"
|
|
"movq\t%%rax,%1\n\t"
|
|
"movl\t$8,%%eax\n"
|
|
#else /* i386 */
|
|
"rdrand\t%%eax\n\t"
|
|
"jnc\t1f\n\t"
|
|
"movl\t%%eax,%1\n\t"
|
|
"movl\t$4,%%eax\n"
|
|
#endif
|
|
"1:\n" /* %eax is cleared by processor on failure */
|
|
: "=a" (count), "=g" (*tmp) : "a" (0) : "cc");
|
|
return (count);
|
|
#else /* __GNUCLIKE_ASM */
|
|
return (0);
|
|
#endif
|
|
}
|
|
|
|
static int
|
|
random_ivy_read(void *buf, int c)
|
|
{
|
|
uint8_t *b;
|
|
int count, ret, retry;
|
|
uint64_t tmp;
|
|
|
|
b = buf;
|
|
for (count = c; count > 0; count -= ret) {
|
|
for (retry = 0; retry < RETRY_COUNT; retry++) {
|
|
ret = ivy_rng_store(&tmp);
|
|
if (ret != 0)
|
|
break;
|
|
}
|
|
if (ret == 0)
|
|
break;
|
|
if (ret > count)
|
|
ret = count;
|
|
memcpy(b, &tmp, ret);
|
|
b += ret;
|
|
}
|
|
return (c - count);
|
|
}
|
|
|
|
static int
|
|
rdrand_modevent(module_t mod, int type, void *unused)
|
|
{
|
|
int error = 0;
|
|
|
|
switch (type) {
|
|
case MOD_LOAD:
|
|
if (cpu_feature2 & CPUID2_RDRAND)
|
|
live_entropy_source_register(&random_ivy);
|
|
else
|
|
#ifndef KLD_MODULE
|
|
if (bootverbose)
|
|
#endif
|
|
printf("%s: RDRAND is not present\n",
|
|
random_ivy.ident);
|
|
break;
|
|
|
|
case MOD_UNLOAD:
|
|
if (cpu_feature2 & CPUID2_RDRAND)
|
|
live_entropy_source_deregister(&random_ivy);
|
|
break;
|
|
|
|
case MOD_SHUTDOWN:
|
|
break;
|
|
|
|
default:
|
|
error = EOPNOTSUPP;
|
|
break;
|
|
|
|
}
|
|
|
|
return (error);
|
|
}
|
|
|
|
LIVE_ENTROPY_SRC_MODULE(random_rdrand, rdrand_modevent, 1);
|