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Index: head/UPDATING
===================================================================
--- head/UPDATING
+++ head/UPDATING
@@ -31,6 +31,12 @@
disable the most expensive debugging functionality run
"ln -s 'abort:false,junk:false' /etc/malloc.conf".)
+20190416:
+ The loadable random module KPI has changed; the random_infra_init()
+ routine now requires a 3rd function pointer for a bool (*)(void)
+ method that returns true if the random device is seeded (and
+ therefore unblocked).
+
20190404:
r345895 reverts r320698. This implies that an nfsuserd(8) daemon
built from head sources between r320757 (July 6, 2017) and
Index: head/share/man/man9/Makefile
===================================================================
--- head/share/man/man9/Makefile
+++ head/share/man/man9/Makefile
@@ -1668,6 +1668,7 @@
psignal.9 tdsignal.9
MLINKS+=random.9 arc4rand.9 \
random.9 arc4random.9 \
+ random.9 is_random_seeded.9 \
random.9 read_random.9 \
random.9 read_random_uio.9 \
random.9 srandom.9
Index: head/share/man/man9/random.9
===================================================================
--- head/share/man/man9/random.9
+++ head/share/man/man9/random.9
@@ -26,13 +26,14 @@
.\"
.\" $FreeBSD$
.\" "
-.Dd April 15, 2019
+.Dd April 16, 2019
.Dt RANDOM 9
.Os
.Sh NAME
.Nm arc4rand ,
.Nm arc4random ,
.Nm arc4random_buf ,
+.Nm is_random_seeded ,
.Nm random ,
.Nm read_random ,
.Nm read_random_uio ,
@@ -48,6 +49,8 @@
.Fn arc4rand "void *ptr" "u_int length" "int reseed"
.Pp
.In sys/random.h
+.Ft bool
+.Fn is_random_seeded "void"
.Ft void
.Fn read_random "void *buffer" "int count"
.Ft int
@@ -106,6 +109,13 @@
instead, use the
.Fn arc4rand
family of functions.
+.Pp
+The
+.Fn is_random_seeded
+function can be used to check in advance if
+.Fn read_random
+will block.
+(If random is seeded, it will not block.)
.Pp
The
.Fn read_random_uio
Index: head/sys/dev/random/random_infra.c
===================================================================
--- head/sys/dev/random/random_infra.c
+++ head/sys/dev/random/random_infra.c
@@ -63,12 +63,20 @@
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;
@@ -82,12 +90,15 @@
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))
+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();
}
@@ -98,6 +109,7 @@
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();
}
@@ -128,5 +140,14 @@
random_reader_context.read_random(buf, len);
RANDOM_CONFIG_S_UNLOCK();
}
+
+bool
+is_random_seeded(void)
+{
+ RANDOM_CONFIG_S_LOCK();
+ random_reader_context.is_random_seeded();
+ RANDOM_CONFIG_S_UNLOCK();
+}
+
#endif /* defined(RANDOM_LOADABLE) */
Index: head/sys/dev/random/randomdev.h
===================================================================
--- head/sys/dev/random/randomdev.h
+++ head/sys/dev/random/randomdev.h
@@ -118,7 +118,8 @@
#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));
+void random_infra_init(int (*)(struct uio *, bool), void (*)(void *, u_int),
+ bool (*)(void));
void random_infra_uninit(void);
#endif
Index: head/sys/dev/random/randomdev.c
===================================================================
--- head/sys/dev/random/randomdev.c
+++ head/sys/dev/random/randomdev.c
@@ -62,11 +62,14 @@
#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
#endif
static d_read_t randomdev_read;
@@ -93,7 +96,7 @@
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);
+ random_infra_init(READ_RANDOM_UIO, READ_RANDOM, IS_RANDOM_SEEDED);
#endif
}
@@ -269,6 +272,12 @@
explicit_bzero(remainder_buf, sizeof(remainder_buf));
}
+}
+
+bool
+IS_RANDOM_SEEDED(void)
+{
+ return (p_random_alg_context->ra_seeded());
}
static __inline void
Index: head/sys/sys/param.h
===================================================================
--- head/sys/sys/param.h
+++ head/sys/sys/param.h
@@ -60,7 +60,7 @@
* in the range 5 to 9.
*/
#undef __FreeBSD_version
-#define __FreeBSD_version 1300018 /* Master, propagated to newvers */
+#define __FreeBSD_version 1300019 /* Master, propagated to newvers */
/*
* __FreeBSD_kernel__ indicates that this system uses the kernel of FreeBSD,
Index: head/sys/sys/random.h
===================================================================
--- head/sys/sys/random.h
+++ head/sys/sys/random.h
@@ -40,6 +40,7 @@
#if defined(DEV_RANDOM)
void read_random(void *, u_int);
int read_random_uio(struct uio *, bool);
+bool is_random_seeded(void);
#else
static __inline int
read_random_uio(void *a __unused, u_int b __unused)
@@ -49,6 +50,11 @@
static __inline void
read_random(void *a __unused, u_int b __unused)
{
+}
+static __inline bool
+is_random_seeded(void)
+{
+ return (false);
}
#endif

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