forked from Minki/linux
ff98cc986a
The random longs to be pulled by arch_get_random_long() are prepared in an 4K buffer which is filled from the NIST 800-90 compliant s390 drbg. By default the random long buffer is refilled 256 times before the drbg itself needs a reseed. The reseed of the drbg is done with 32 bytes fetched from the high quality (but slow) trng which is assumed to deliver 100% entropy. So the 32 * 8 = 256 bits of entropy are spread over 256 * 4KB = 1MB serving 131072 arch_get_random_long() invocations before reseeded. How often the 4K random long buffer is refilled with the drbg before the drbg is reseeded can be adjusted. There is a module parameter 's390_arch_rnd_long_drbg_reseed' accessible via /sys/module/arch_random/parameters/rndlong_drbg_reseed or as kernel command line parameter arch_random.rndlong_drbg_reseed=<value> This parameter tells how often the drbg fills the 4K buffer before it is re-seeded by fresh entropy from the trng. A value of 16 results in reseeding the drbg at every 16 * 4 KB = 64 KB with 32 bytes of fresh entropy pulled from the trng. So a value of 16 would result in 256 bits entropy per 64 KB. A value of 256 results in 1MB of drbg output before a reseed of the drbg is done. So this would spread the 256 bits of entropy among 1MB. Setting this parameter to 0 forces the reseed to take place every time the 4K buffer is depleted, so the entropy rises to 256 bits entropy per 4K or 0.5 bit entropy per arch_get_random_long(). With setting this parameter to negative values all this effort is disabled, arch_get_random long() returns false and thus indicating that the arch_get_random_long() feature is disabled at all. arch_get_random_long() is used by random.c among others to provide an initial hash value to be mixed with the entropy pool on every random data pull. For about 64 bytes read from /dev/urandom there is one call to arch_get_random_long(). So these additional random long values count for performance of /dev/urandom with measurable but low penalty. Signed-off-by: Harald Freudenberger <freude@linux.ibm.com> Reviewed-by: Ingo Franzki <ifranzki@linux.ibm.com> Reviewed-by: Juergen Christ <jchrist@linux.ibm.com> Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
55 lines
1.3 KiB
C
55 lines
1.3 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
|
|
/*
|
|
* Kernel interface for the s390 arch_random_* functions
|
|
*
|
|
* Copyright IBM Corp. 2017, 2020
|
|
*
|
|
* Author: Harald Freudenberger <freude@de.ibm.com>
|
|
*
|
|
*/
|
|
|
|
#ifndef _ASM_S390_ARCHRANDOM_H
|
|
#define _ASM_S390_ARCHRANDOM_H
|
|
|
|
#ifdef CONFIG_ARCH_RANDOM
|
|
|
|
#include <linux/static_key.h>
|
|
#include <linux/atomic.h>
|
|
|
|
DECLARE_STATIC_KEY_FALSE(s390_arch_random_available);
|
|
extern atomic64_t s390_arch_random_counter;
|
|
|
|
bool s390_arch_get_random_long(unsigned long *v);
|
|
bool s390_arch_random_generate(u8 *buf, unsigned int nbytes);
|
|
|
|
static inline bool __must_check arch_get_random_long(unsigned long *v)
|
|
{
|
|
if (static_branch_likely(&s390_arch_random_available))
|
|
return s390_arch_get_random_long(v);
|
|
return false;
|
|
}
|
|
|
|
static inline bool __must_check arch_get_random_int(unsigned int *v)
|
|
{
|
|
return false;
|
|
}
|
|
|
|
static inline bool __must_check arch_get_random_seed_long(unsigned long *v)
|
|
{
|
|
if (static_branch_likely(&s390_arch_random_available)) {
|
|
return s390_arch_random_generate((u8 *)v, sizeof(*v));
|
|
}
|
|
return false;
|
|
}
|
|
|
|
static inline bool __must_check arch_get_random_seed_int(unsigned int *v)
|
|
{
|
|
if (static_branch_likely(&s390_arch_random_available)) {
|
|
return s390_arch_random_generate((u8 *)v, sizeof(*v));
|
|
}
|
|
return false;
|
|
}
|
|
|
|
#endif /* CONFIG_ARCH_RANDOM */
|
|
#endif /* _ASM_S390_ARCHRANDOM_H */
|