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Count cprng_fast reseed events.

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This commit is contained in:
riastradh 2020-04-30 03:29:45 +00:00
parent 66a63640d3
commit 2c43339709
1 changed files with 14 additions and 5 deletions

19
sys/crypto/cprng_fast/cprng_fast.c

@ -1,4 +1,4 @@
/* $NetBSD: cprng_fast.c,v 1.14 2020/04/30 03:29:35 riastradh Exp $ */
/* $NetBSD: cprng_fast.c,v 1.15 2020/04/30 03:29:45 riastradh Exp $ */
/*-
* Copyright (c) 2014 The NetBSD Foundation, Inc.
@ -30,7 +30,7 @@
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: cprng_fast.c,v 1.14 2020/04/30 03:29:35 riastradh Exp $");
__KERNEL_RCSID(0, "$NetBSD: cprng_fast.c,v 1.15 2020/04/30 03:29:45 riastradh Exp $");
#include <sys/types.h>
#include <sys/param.h>
@ -38,7 +38,9 @@ __KERNEL_RCSID(0, "$NetBSD: cprng_fast.c,v 1.14 2020/04/30 03:29:35 riastradh Ex
#include <sys/cprng.h>
#include <sys/cpu.h>
#include <sys/entropy.h>
#include <sys/evcnt.h>
#include <sys/intr.h>
#include <sys/kmem.h>
#include <sys/percpu.h>
/* ChaCha core */
@ -198,6 +200,7 @@ struct cprng_fast {
uint32_t buffer[crypto_core_OUTPUTWORDS];
uint32_t key[crypto_core_KEYWORDS];
uint32_t nonce[crypto_core_INPUTWORDS];
struct evcnt *reseed_evcnt;
unsigned epoch;
};
@ -221,14 +224,14 @@ cprng_fast_init(void)
{
crypto_core_selftest();
cprng_fast_percpu = percpu_alloc(sizeof(struct cprng_fast));
percpu_foreach(cprng_fast_percpu, &cprng_fast_init_cpu, NULL);
cprng_fast_percpu = percpu_create(sizeof(struct cprng_fast),
cprng_fast_init_cpu, NULL, NULL);
cprng_fast_softint = softint_establish(SOFTINT_SERIAL|SOFTINT_MPSAFE,
&cprng_fast_intr, NULL);
}
static void
cprng_fast_init_cpu(void *p, void *arg __unused, struct cpu_info *ci __unused)
cprng_fast_init_cpu(void *p, void *arg __unused, struct cpu_info *ci)
{
struct cprng_fast *const cprng = p;
uint8_t seed[CPRNG_FAST_SEED_BYTES];
@ -237,6 +240,11 @@ cprng_fast_init_cpu(void *p, void *arg __unused, struct cpu_info *ci __unused)
cprng_strong(kern_cprng, seed, sizeof seed, 0);
cprng_fast_seed(cprng, seed);
(void)explicit_memset(seed, 0, sizeof seed);
cprng->reseed_evcnt = kmem_alloc(sizeof(*cprng->reseed_evcnt),
KM_SLEEP);
evcnt_attach_dynamic(cprng->reseed_evcnt, EVCNT_TYPE_MISC, NULL,
ci->ci_cpuname, "cprng_fast reseed");
}
static inline int
@ -285,6 +293,7 @@ cprng_fast_intr(void *cookie __unused)
s = splvm();
cprng_fast_seed(cprng, seed);
cprng->epoch = epoch;
cprng->reseed_evcnt->ev_count++;
splx(s);
percpu_putref(cprng_fast_percpu);