svn commit: r356096 - in head: . sys/dev/random sys/sys
Conrad Meyer
cem at FreeBSD.org
Thu Dec 26 19:32:13 UTC 2019
Author: cem
Date: Thu Dec 26 19:32:11 2019
New Revision: 356096
URL: https://svnweb.freebsd.org/changeset/base/356096
Log:
random(4): Simplify RANDOM_LOADABLE
Simplify RANDOM_LOADABLE by removing the ability to unload a LOADABLE
random(4) implementation. This allows one-time random module selection
at boot, by loader(8). Swapping modules on the fly doesn't seem
especially useful.
This removes the need to hold a lock over the sleepable module calls
read_random and read_random_uio.
init/deinit have been pulled out of random_algorithm entirely. Algorithms
can run their own sysinits to initialize; deinit is removed entirely, as
algorithms can not be unloaded. Algorithms should initialize at
SI_SUB_RANDOM:SI_ORDER_SECOND. In LOADABLE systems, algorithms install
a pointer to their local random_algorithm context in p_random_alg_context at
that time.
Go ahead and const'ify random_algorithm objects; there is no need to mutate
them at runtime.
LOADABLE kernel NULL checks are removed from random_harvestq by ordering
random_harvestq initialization at SI_SUB_RANDOM:SI_ORDER_THIRD, after
algorithm init. Prior to random_harvestq init, hc_harvest_mask is zero and
no events are forwarded to algorithms; after random_harvestq init, the
relevant pointers will already have been installed.
Remove the bulk of random_infra shim wrappers and instead expose the bare
function pointers in sys/random.h. In LOADABLE systems, read_random(9) et
al are just thin shim macros around invoking the associated function
pointer. We do not provide a registration system but instead expect
LOADABLE modules to register themselves at SI_SUB_RANDOM:SI_ORDER_SECOND.
An example is provided in randomdev.c, as used in the random_fortuna.ko
module.
Approved by: csprng(markm)
Discussed with: gordon
Differential Revision: https://reviews.freebsd.org/D22512
Modified:
head/UPDATING
head/sys/dev/random/fortuna.c
head/sys/dev/random/other_algorithm.c
head/sys/dev/random/random_harvestq.c
head/sys/dev/random/random_infra.c
head/sys/dev/random/randomdev.c
head/sys/dev/random/randomdev.h
head/sys/sys/random.h
Modified: head/UPDATING
==============================================================================
--- head/UPDATING Thu Dec 26 18:59:43 2019 (r356095)
+++ head/UPDATING Thu Dec 26 19:32:11 2019 (r356096)
@@ -26,6 +26,9 @@ NOTE TO PEOPLE WHO THINK THAT FreeBSD 13.x IS SLOW:
disable the most expensive debugging functionality run
"ln -s 'abort:false,junk:false' /etc/malloc.conf".)
+20191226:
+ Kernel-loadable random(4) modules are no longer unloadable.
+
20191222:
Clang, llvm, lld, lldb, compiler-rt, libc++, libunwind and openmp have
been upgraded to 9.0.1. Please see the 20141231 entry below for
Modified: head/sys/dev/random/fortuna.c
==============================================================================
--- head/sys/dev/random/fortuna.c Thu Dec 26 18:59:43 2019 (r356095)
+++ head/sys/dev/random/fortuna.c Thu Dec 26 19:32:11 2019 (r356096)
@@ -261,15 +261,14 @@ static void random_fortuna_read(uint8_t *, size_t);
static bool random_fortuna_seeded(void);
static bool random_fortuna_seeded_internal(void);
static void random_fortuna_process_event(struct harvest_event *);
-static void random_fortuna_init_alg(void *);
-static void random_fortuna_deinit_alg(void *);
static void random_fortuna_reseed_internal(uint32_t *entropy_data, u_int blockcount);
-struct random_algorithm random_alg_context = {
+#ifdef RANDOM_LOADABLE
+static
+#endif
+const struct random_algorithm random_alg_context = {
.ra_ident = "Fortuna",
- .ra_init_alg = random_fortuna_init_alg,
- .ra_deinit_alg = random_fortuna_deinit_alg,
.ra_pre_read = random_fortuna_pre_read,
.ra_read = random_fortuna_read,
.ra_seeded = random_fortuna_seeded,
@@ -286,6 +285,10 @@ random_fortuna_init_alg(void *unused __unused)
struct sysctl_oid *random_fortuna_o;
#endif
+#ifdef RANDOM_LOADABLE
+ p_random_alg_context = &random_alg_context;
+#endif
+
RANDOM_RESEED_INIT_LOCK();
/*
* Fortuna parameters. Do not adjust these unless you have
@@ -330,18 +333,8 @@ random_fortuna_init_alg(void *unused __unused)
fortuna_state.fs_counter = UINT128_ZERO;
explicit_bzero(&fortuna_state.fs_key, sizeof(fortuna_state.fs_key));
}
-
-/* ARGSUSED */
-static void
-random_fortuna_deinit_alg(void *unused __unused)
-{
-
- RANDOM_RESEED_DEINIT_LOCK();
- explicit_bzero(&fortuna_state, sizeof(fortuna_state));
-#ifdef _KERNEL
- sysctl_ctx_free(&random_clist);
-#endif
-}
+SYSINIT(random_alg, SI_SUB_RANDOM, SI_ORDER_SECOND, random_fortuna_init_alg,
+ NULL);
/*-
* FS&K - AddRandomEvent()
Modified: head/sys/dev/random/other_algorithm.c
==============================================================================
--- head/sys/dev/random/other_algorithm.c Thu Dec 26 18:59:43 2019 (r356095)
+++ head/sys/dev/random/other_algorithm.c Thu Dec 26 19:32:11 2019 (r356096)
@@ -87,8 +87,6 @@ static void random_other_pre_read(void);
static void random_other_read(uint8_t *, size_t);
static bool random_other_seeded(void);
static void random_other_process_event(struct harvest_event *);
-static void random_other_init_alg(void *);
-static void random_other_deinit_alg(void *);
/*
* RANDOM_OTHER_NPOOLS is used when reading hardware random
@@ -97,10 +95,11 @@ static void random_other_deinit_alg(void *);
*/
#define RANDOM_OTHER_NPOOLS 1
-struct random_algorithm random_alg_context = {
+#ifdef RANDOM_LOADABLE
+static
+#endif
+const struct random_algorithm random_alg_context = {
.ra_ident = "other",
- .ra_init_alg = random_other_init_alg,
- .ra_deinit_alg = random_other_deinit_alg,
.ra_pre_read = random_other_pre_read,
.ra_read = random_other_read,
.ra_seeded = random_other_seeded,
@@ -112,34 +111,20 @@ struct random_algorithm random_alg_context = {
static mtx_t other_mtx;
/*
- * void random_other_init_alg(void *unused __unused)
- *
* Do algorithm-specific initialisation here.
*/
-void
+static void
random_other_init_alg(void *unused __unused)
{
+#ifdef RANDOM_LOADABLE
+ p_random_alg_context = &random_alg_context;
+#endif
+
RANDOM_RESEED_INIT_LOCK();
- /*
- * Do set-up work here!
- */
}
-
-/*
- * void random_other_deinit_alg(void *unused __unused)
- *
- * Do algorithm-specific deinitialisation here.
- */
-static void
-random_other_deinit_alg(void *unused __unused)
-{
-
- /*
- * Do tear-down work here!
- */
- RANDOM_RESEED_DEINIT_LOCK();
-}
+SYSINIT(random_alg, SI_SUB_RANDOM, SI_ORDER_SECOND, random_other_init_alg,
+ NULL);
/*
* void random_other_pre_read(void)
Modified: head/sys/dev/random/random_harvestq.c
==============================================================================
--- head/sys/dev/random/random_harvestq.c Thu Dec 26 18:59:43 2019 (r356095)
+++ head/sys/dev/random/random_harvestq.c Thu Dec 26 19:32:11 2019 (r356096)
@@ -49,11 +49,6 @@ __FBSDID("$FreeBSD$");
#include <sys/sysctl.h>
#include <sys/unistd.h>
-#if defined(RANDOM_LOADABLE)
-#include <sys/lock.h>
-#include <sys/sx.h>
-#endif
-
#include <machine/atomic.h>
#include <machine/cpu.h>
@@ -163,14 +158,7 @@ static struct kproc_desc random_proc_kp = {
static __inline void
random_harvestq_fast_process_event(struct harvest_event *event)
{
-#if defined(RANDOM_LOADABLE)
- RANDOM_CONFIG_S_LOCK();
- if (p_random_alg_context)
-#endif
p_random_alg_context->ra_event_processor(event);
-#if defined(RANDOM_LOADABLE)
- RANDOM_CONFIG_S_UNLOCK();
-#endif
explicit_bzero(event, sizeof(*event));
}
@@ -230,11 +218,6 @@ random_sources_feed(void)
* Step over all of live entropy sources, and feed their output
* to the system-wide RNG.
*/
-#if defined(RANDOM_LOADABLE)
- RANDOM_CONFIG_S_LOCK();
- if (p_random_alg_context) {
- /* It's an indenting error. Yeah, Yeah. */
-#endif
local_read_rate = atomic_readandclear_32(&read_rate);
/* Perform at least one read per round */
local_read_rate = MAX(local_read_rate, 1);
@@ -261,10 +244,6 @@ random_sources_feed(void)
}
}
explicit_bzero(entropy, sizeof(entropy));
-#if defined(RANDOM_LOADABLE)
- }
- RANDOM_CONFIG_S_UNLOCK();
-#endif
}
void
@@ -396,7 +375,7 @@ random_harvestq_init(void *unused __unused)
RANDOM_HARVEST_INIT_LOCK();
harvest_context.hc_entropy_ring.in = harvest_context.hc_entropy_ring.out = 0;
}
-SYSINIT(random_device_h_init, SI_SUB_RANDOM, SI_ORDER_SECOND, random_harvestq_init, NULL);
+SYSINIT(random_device_h_init, SI_SUB_RANDOM, SI_ORDER_THIRD, random_harvestq_init, NULL);
/*
* Subroutine to slice up a contiguous chunk of 'entropy' and feed it into the
@@ -485,7 +464,7 @@ random_harvestq_deinit(void *unused __unused)
while (random_kthread_control >= 0)
tsleep(&harvest_context.hc_kthread_proc, 0, "harvqterm", hz/5);
}
-SYSUNINIT(random_device_h_init, SI_SUB_RANDOM, SI_ORDER_SECOND, random_harvestq_deinit, NULL);
+SYSUNINIT(random_device_h_init, SI_SUB_RANDOM, SI_ORDER_THIRD, random_harvestq_deinit, NULL);
/*-
* Entropy harvesting queue routine.
Modified: head/sys/dev/random/random_infra.c
==============================================================================
--- head/sys/dev/random/random_infra.c Thu Dec 26 18:59:43 2019 (r356095)
+++ head/sys/dev/random/random_infra.c Thu Dec 26 19:32:11 2019 (r356096)
@@ -35,11 +35,6 @@ __FBSDID("$FreeBSD$");
#include <sys/random.h>
#include <sys/sysctl.h>
-#if defined(RANDOM_LOADABLE)
-#include <sys/lock.h>
-#include <sys/sx.h>
-#endif
-
#include <dev/random/randomdev.h>
/* Set up the sysctl root node for the entropy device */
@@ -102,107 +97,8 @@ SYSCTL_BOOL(_kern_random_initial_seeding, OID_AUTO,
MALLOC_DEFINE(M_ENTROPY, "entropy", "Entropy harvesting buffers and data structures");
#if defined(RANDOM_LOADABLE)
-struct random_algorithm *p_random_alg_context = NULL;
-#else /* !defined(RANDOM_LOADABLE) */
-struct random_algorithm *p_random_alg_context = &random_alg_context;
-#endif /* defined(RANDOM_LOADABLE) */
-
-#if defined(RANDOM_LOADABLE)
-
-static void
-null_read_random(void *dummy __unused, u_int dummy2 __unused)
-{
- panic("%s: no random module is loaded", __func__);
-}
-
-static bool
-null_is_random_seeded(void)
-{
- return (false);
-}
-
-struct random_readers {
- int (*read_random_uio)(struct uio *, bool);
- void (*read_random)(void *, u_int);
- bool (*is_random_seeded)(void);
-} random_reader_context = {
- (int (*)(struct uio *, bool))nullop,
- null_read_random,
- null_is_random_seeded,
-};
-
-struct sx randomdev_config_lock;
-
-static void
-random_infra_sysinit(void *dummy __unused)
-{
-
- RANDOM_CONFIG_INIT_LOCK();
-}
-SYSINIT(random_device_h_init, SI_SUB_RANDOM, SI_ORDER_FIRST, random_infra_sysinit, NULL);
-
-void
-random_infra_init(int (*p_random_read_uio)(struct uio *, bool),
- void (*p_random_read)(void *, u_int),
- bool (*p_is_random_seeded)(void))
-{
-
- RANDOM_CONFIG_X_LOCK();
- random_reader_context.read_random_uio = p_random_read_uio;
- random_reader_context.read_random = p_random_read;
- random_reader_context.is_random_seeded = p_is_random_seeded;
- RANDOM_CONFIG_X_UNLOCK();
-}
-
-void
-random_infra_uninit(void)
-{
-
- RANDOM_CONFIG_X_LOCK();
- random_reader_context.read_random_uio = (int (*)(struct uio *, bool))nullop;
- random_reader_context.read_random = null_read_random;
- random_reader_context.is_random_seeded = null_is_random_seeded;
- RANDOM_CONFIG_X_UNLOCK();
-}
-
-static void
-random_infra_sysuninit(void *dummy __unused)
-{
-
- RANDOM_CONFIG_DEINIT_LOCK();
-}
-SYSUNINIT(random_device_h_init, SI_SUB_RANDOM, SI_ORDER_FIRST, random_infra_sysuninit, NULL);
-
-int
-read_random_uio(struct uio *uio, bool nonblock)
-{
- int retval;
-
- RANDOM_CONFIG_S_LOCK();
- retval = random_reader_context.read_random_uio(uio, nonblock);
- RANDOM_CONFIG_S_UNLOCK();
- return (retval);
-}
-
-void
-read_random(void *buf, u_int len)
-{
-
- RANDOM_CONFIG_S_LOCK();
- random_reader_context.read_random(buf, len);
- RANDOM_CONFIG_S_UNLOCK();
-}
-
-bool
-is_random_seeded(void)
-{
- bool result;
-
- RANDOM_CONFIG_S_LOCK();
- result = random_reader_context.is_random_seeded();
- RANDOM_CONFIG_S_UNLOCK();
- return (result);
-}
-
-
+const struct random_algorithm *p_random_alg_context;
+void (*_read_random)(void *, u_int);
+int (*_read_random_uio)(struct uio *, bool);
+bool (*_is_random_seeded)(void);
#endif /* defined(RANDOM_LOADABLE) */
Modified: head/sys/dev/random/randomdev.c
==============================================================================
--- head/sys/dev/random/randomdev.c Thu Dec 26 18:59:43 2019 (r356095)
+++ head/sys/dev/random/randomdev.c Thu Dec 26 19:32:11 2019 (r356096)
@@ -59,17 +59,17 @@ __FBSDID("$FreeBSD$");
#define RANDOM_UNIT 0
+/*
+ * In loadable random, the core randomdev.c / random(9) routines have static
+ * visibility and an alternative name to avoid conflicting with the function
+ * pointers of the real names in the core kernel. random_alg_context_init
+ * installs pointers to the loadable static names into the core kernel's
+ * function pointers at SI_SUB_RANDOM:SI_ORDER_SECOND.
+ */
#if defined(RANDOM_LOADABLE)
-#define READ_RANDOM_UIO _read_random_uio
-#define READ_RANDOM _read_random
-#define IS_RANDOM_SEEDED _is_random_seeded
-static int READ_RANDOM_UIO(struct uio *, bool);
-static void READ_RANDOM(void *, u_int);
-static bool IS_RANDOM_SEEDED(void);
-#else
-#define READ_RANDOM_UIO read_random_uio
-#define READ_RANDOM read_random
-#define IS_RANDOM_SEEDED is_random_seeded
+static int (read_random_uio)(struct uio *, bool);
+static void (read_random)(void *, u_int);
+static bool (is_random_seeded)(void);
#endif
static d_read_t randomdev_read;
@@ -89,31 +89,18 @@ static struct cdevsw random_cdevsw = {
/* For use with make_dev(9)/destroy_dev(9). */
static struct cdev *random_dev;
-static void
-random_alg_context_ra_init_alg(void *data)
-{
-
- p_random_alg_context = &random_alg_context;
- p_random_alg_context->ra_init_alg(data);
#if defined(RANDOM_LOADABLE)
- random_infra_init(READ_RANDOM_UIO, READ_RANDOM, IS_RANDOM_SEEDED);
-#endif
-}
-
static void
-random_alg_context_ra_deinit_alg(void *data)
+random_alg_context_init(void *dummy __unused)
{
-
-#if defined(RANDOM_LOADABLE)
- random_infra_uninit();
-#endif
- p_random_alg_context->ra_deinit_alg(data);
- p_random_alg_context = NULL;
+ _read_random_uio = (read_random_uio);
+ _read_random = (read_random);
+ _is_random_seeded = (is_random_seeded);
}
+SYSINIT(random_device, SI_SUB_RANDOM, SI_ORDER_SECOND, random_alg_context_init,
+ NULL);
+#endif
-SYSINIT(random_device, SI_SUB_RANDOM, SI_ORDER_THIRD, random_alg_context_ra_init_alg, NULL);
-SYSUNINIT(random_device, SI_SUB_RANDOM, SI_ORDER_THIRD, random_alg_context_ra_deinit_alg, NULL);
-
static struct selinfo rsel;
/*
@@ -124,7 +111,7 @@ static int
randomdev_read(struct cdev *dev __unused, struct uio *uio, int flags)
{
- return (READ_RANDOM_UIO(uio, (flags & O_NONBLOCK) != 0));
+ return ((read_random_uio)(uio, (flags & O_NONBLOCK) != 0));
}
/*
@@ -154,7 +141,7 @@ randomdev_wait_until_seeded(bool interruptible)
if (spamcount == 0)
printf("random: %s unblock wait\n", __func__);
spamcount = (spamcount + 1) % 100;
- error = tsleep(&random_alg_context, slpflags, "randseed",
+ error = tsleep(p_random_alg_context, slpflags, "randseed",
hz / 10);
if (error == ERESTART || error == EINTR) {
KASSERT(interruptible,
@@ -170,7 +157,7 @@ randomdev_wait_until_seeded(bool interruptible)
}
int
-READ_RANDOM_UIO(struct uio *uio, bool nonblock)
+(read_random_uio)(struct uio *uio, bool nonblock)
{
/* 16 MiB takes about 0.08 s CPU time on my 2017 AMD Zen CPU */
#define SIGCHK_PERIOD (16 * 1024 * 1024)
@@ -238,7 +225,7 @@ READ_RANDOM_UIO(struct uio *uio, bool nonblock)
*/
if (error == 0 && uio->uio_resid != 0 &&
total_read % sigchk_period == 0) {
- error = tsleep_sbt(&random_alg_context, PCATCH,
+ error = tsleep_sbt(p_random_alg_context, PCATCH,
"randrd", SBT_1NS, 0, C_HARDCLOCK);
/* Squash tsleep timeout condition */
if (error == EWOULDBLOCK)
@@ -271,7 +258,7 @@ READ_RANDOM_UIO(struct uio *uio, bool nonblock)
* 'kern.random.initial_seeding.read_random_bypassed_before_seeding'.
*/
void
-READ_RANDOM(void *random_buf, u_int len)
+(read_random)(void *random_buf, u_int len)
{
KASSERT(random_buf != NULL, ("No suitable random buffer in %s", __func__));
@@ -305,7 +292,7 @@ READ_RANDOM(void *random_buf, u_int len)
}
bool
-IS_RANDOM_SEEDED(void)
+(is_random_seeded)(void)
{
return (p_random_alg_context->ra_seeded());
}
@@ -356,7 +343,7 @@ randomdev_write(struct cdev *dev __unused, struct uio
if (error)
break;
randomdev_accumulate(random_buf, c);
- tsleep(&random_alg_context, 0, "randwr", hz/10);
+ tsleep(p_random_alg_context, 0, "randwr", hz/10);
}
if (nbytes != uio->uio_resid && (error == ERESTART || error == EINTR))
/* Partial write, not error. */
@@ -385,7 +372,7 @@ randomdev_unblock(void)
{
selwakeuppri(&rsel, PUSER);
- wakeup(&random_alg_context);
+ wakeup(p_random_alg_context);
printf("random: unblocking device.\n");
/* Do random(9) a favour while we are about it. */
(void)atomic_cmpset_int(&arc4rand_iniseed_state, ARC4_ENTR_NONE, ARC4_ENTR_HAVE);
@@ -424,7 +411,7 @@ randomdev_modevent(module_t mod __unused, int type, vo
make_dev_alias(random_dev, "urandom"); /* compatibility */
break;
case MOD_UNLOAD:
- destroy_dev(random_dev);
+ error = EBUSY;
break;
case MOD_SHUTDOWN:
break;
Modified: head/sys/dev/random/randomdev.h
==============================================================================
--- head/sys/dev/random/randomdev.h Thu Dec 26 18:59:43 2019 (r356095)
+++ head/sys/dev/random/randomdev.h Thu Dec 26 19:32:11 2019 (r356096)
@@ -79,15 +79,18 @@ typedef u_int random_source_read_t(void *, u_int);
struct random_algorithm {
const char *ra_ident;
u_int ra_poolcount;
- void (*ra_init_alg)(void *);
- void (*ra_deinit_alg)(void *);
random_alg_pre_read_t *ra_pre_read;
random_alg_read_t *ra_read;
random_alg_seeded_t *ra_seeded;
random_alg_eventprocessor_t *ra_event_processor;
};
-extern struct random_algorithm random_alg_context, *p_random_alg_context;
+#if defined(RANDOM_LOADABLE)
+extern const struct random_algorithm *p_random_alg_context;
+#else
+extern const struct random_algorithm random_alg_context;
+#define p_random_alg_context (&random_alg_context)
+#endif
#ifdef _KERNEL
@@ -104,19 +107,6 @@ struct random_source {
void random_source_register(struct random_source *);
void random_source_deregister(struct random_source *);
-
-#if defined(RANDOM_LOADABLE)
-extern struct sx randomdev_config_lock;
-#define RANDOM_CONFIG_INIT_LOCK(x) sx_init(&randomdev_config_lock, "configuration change lock")
-#define RANDOM_CONFIG_X_LOCK(x) sx_xlock(&randomdev_config_lock)
-#define RANDOM_CONFIG_X_UNLOCK(x) sx_xunlock(&randomdev_config_lock)
-#define RANDOM_CONFIG_S_LOCK(x) sx_slock(&randomdev_config_lock)
-#define RANDOM_CONFIG_S_UNLOCK(x) sx_sunlock(&randomdev_config_lock)
-#define RANDOM_CONFIG_DEINIT_LOCK(x) sx_destroy(&randomdev_config_lock)
-void random_infra_init(int (*)(struct uio *, bool), void (*)(void *, u_int),
- bool (*)(void));
-void random_infra_uninit(void);
-#endif
#endif /* _KERNEL */
Modified: head/sys/sys/random.h
==============================================================================
--- head/sys/sys/random.h Thu Dec 26 18:59:43 2019 (r356095)
+++ head/sys/sys/random.h Thu Dec 26 19:32:11 2019 (r356096)
@@ -37,9 +37,35 @@
struct uio;
+/*
+ * In the loadable random world, there are set of dangling pointers left in the
+ * core kernel:
+ * * read_random, read_random_uio, is_random_seeded are function pointers,
+ * rather than functions.
+ * * p_random_alg_context is a true pointer in loadable random kernels.
+ *
+ * These are initialized at SI_SUB_RANDOM:SI_ORDER_SECOND during boot. The
+ * read-type pointers are initialized by random_alg_context_init() in
+ * randomdev.c and p_random_alg_context in the algorithm, e.g., fortuna.c's
+ * random_fortuna_init_alg(). The nice thing about function pointers is they
+ * have a similar calling convention to ordinary functions.
+ *
+ * (In !loadable, the read_random, etc, routines are just plain functions;
+ * p_random_alg_context is a macro for the public visibility
+ * &random_alg_context.)
+ */
+#if defined(RANDOM_LOADABLE)
+extern void (*_read_random)(void *, u_int);
+extern int (*_read_random_uio)(struct uio *, bool);
+extern bool (*_is_random_seeded)(void);
+#define read_random(a, b) (*_read_random)(a, b)
+#define read_random_uio(a, b) (*_read_random_uio)(a, b)
+#define is_random_seeded() (*_is_random_seeded)()
+#else
void read_random(void *, u_int);
int read_random_uio(struct uio *, bool);
bool is_random_seeded(void);
+#endif
/*
* Note: if you add or remove members of random_entropy_source, remember to
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