svn commit: r356245 - in head/sys: dev/random dev/vmgenc sys
Conrad Meyer
cem at FreeBSD.org
Wed Jan 1 00:35:04 UTC 2020
Author: cem
Date: Wed Jan 1 00:35:02 2020
New Revision: 356245
URL: https://svnweb.freebsd.org/changeset/base/356245
Log:
vmgenid(4): Integrate as a random(4) source
The number is public and has no "entropy," but should be integrated quickly
on VM rewind events to avoid duplicate sequences.
Approved by: csprng(markm)
Differential Revision: https://reviews.freebsd.org/D22946
Modified:
head/sys/dev/random/fortuna.c
head/sys/dev/random/random_harvestq.c
head/sys/dev/vmgenc/vmgenc_acpi.c
head/sys/sys/random.h
Modified: head/sys/dev/random/fortuna.c
==============================================================================
--- head/sys/dev/random/fortuna.c Tue Dec 31 22:25:06 2019 (r356244)
+++ head/sys/dev/random/fortuna.c Wed Jan 1 00:35:02 2020 (r356245)
@@ -359,6 +359,13 @@ random_fortuna_process_event(struct harvest_event *eve
*/
pl = event->he_destination % RANDOM_FORTUNA_NPOOLS;
/*
+ * If a VM generation ID changes (clone and play or VM rewind), we want
+ * to incorporate that as soon as possible. Override destingation pool
+ * for immediate next use.
+ */
+ if (event->he_source == RANDOM_PURE_VMGENID)
+ pl = 0;
+ /*
* We ignore low entropy static/counter fields towards the end of the
* he_event structure in order to increase measurable entropy when
* conducting SP800-90B entropy analysis measurements of seed material
Modified: head/sys/dev/random/random_harvestq.c
==============================================================================
--- head/sys/dev/random/random_harvestq.c Tue Dec 31 22:25:06 2019 (r356244)
+++ head/sys/dev/random/random_harvestq.c Wed Jan 1 00:35:02 2020 (r356245)
@@ -354,6 +354,7 @@ static const char *random_source_descr[ENTROPYSOURCE]
[RANDOM_PURE_CCP] = "PURE_CCP",
[RANDOM_PURE_DARN] = "PURE_DARN",
[RANDOM_PURE_TPM] = "PURE_TPM",
+ [RANDOM_PURE_VMGENID] = "VMGENID",
/* "ENTROPYSOURCE" */
};
Modified: head/sys/dev/vmgenc/vmgenc_acpi.c
==============================================================================
--- head/sys/dev/vmgenc/vmgenc_acpi.c Tue Dec 31 22:25:06 2019 (r356244)
+++ head/sys/dev/vmgenc/vmgenc_acpi.c Wed Jan 1 00:35:02 2020 (r356245)
@@ -52,12 +52,14 @@ __FBSDID("$FreeBSD$");
#include <sys/malloc.h>
#include <sys/module.h>
#include <sys/mutex.h>
+#include <sys/random.h>
#include <sys/sysctl.h>
#include <sys/systm.h>
#include <contrib/dev/acpica/include/acpi.h>
#include <dev/acpica/acpivar.h>
+#include <dev/random/random_harvestq.h>
#include <dev/vmgenc/vmgenc_acpi.h>
#ifndef ACPI_NOTIFY_STATUS_CHANGED
@@ -80,6 +82,20 @@ struct vmgenc_softc {
};
static void
+vmgenc_harvest_all(const void *p, size_t sz)
+{
+ size_t nbytes;
+
+ while (sz > 0) {
+ nbytes = MIN(sz,
+ sizeof(((struct harvest_event *)0)->he_entropy));
+ random_harvest_direct(p, nbytes, RANDOM_PURE_VMGENID);
+ p = (const char *)p + nbytes;
+ sz -= nbytes;
+ }
+}
+
+static void
vmgenc_status_changed(void *context)
{
uint8_t guid[GUID_BYTES];
@@ -97,6 +113,8 @@ vmgenc_status_changed(void *context)
/* Update cache. */
memcpy(sc->vmg_cache_guid, guid, GUID_BYTES);
+ vmgenc_harvest_all(sc->vmg_cache_guid, sizeof(sc->vmg_cache_guid));
+
EVENTHANDLER_INVOKE(acpi_vmgenc_event);
acpi_UserNotify("VMGenerationCounter", acpi_get_handle(dev), 0);
}
@@ -219,6 +237,9 @@ vmgenc_attach(device_t dev)
memcpy(sc->vmg_cache_guid, __DEVOLATILE(void *, sc->vmg_pguid),
sizeof(sc->vmg_cache_guid));
+ random_harvest_register_source(RANDOM_PURE_VMGENID);
+ vmgenc_harvest_all(sc->vmg_cache_guid, sizeof(sc->vmg_cache_guid));
+
AcpiInstallNotifyHandler(h, ACPI_DEVICE_NOTIFY, vmgenc_notify, dev);
return (0);
}
@@ -238,3 +259,4 @@ static driver_t vmgenc_driver = {
static devclass_t vmgenc_devclass;
DRIVER_MODULE(vmgenc, acpi, vmgenc_driver, vmgenc_devclass, NULL, NULL);
MODULE_DEPEND(vmgenc, acpi, 1, 1, 1);
+MODULE_DEPEND(vemgenc, random_harvestq, 1, 1, 1);
Modified: head/sys/sys/random.h
==============================================================================
--- head/sys/sys/random.h Tue Dec 31 22:25:06 2019 (r356244)
+++ head/sys/sys/random.h Wed Jan 1 00:35:02 2020 (r356245)
@@ -102,6 +102,7 @@ enum random_entropy_source {
RANDOM_PURE_CCP,
RANDOM_PURE_DARN,
RANDOM_PURE_TPM,
+ RANDOM_PURE_VMGENID,
ENTROPYSOURCE
};
_Static_assert(ENTROPYSOURCE <= 32,
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