Add DEV_RANDOM pseudo-option and use it to "include out" random(4)

if desired.

Retire randomdev_none.c and introduce random_infra.c for resident
infrastructure. Completely stub out random(4) calls in the "without
DEV_RANDOM" case.

Add RANDOM_LOADABLE option to allow loadable Yarrow/Fortuna/LocallyWritten
algorithm.  Add a skeleton "other" algorithm framework for folks
to add their own processing code. NIST, anyone?

Retire the RANDOM_DUMMY option.

Build modules for Yarrow, Fortuna and "other".

Use atomics for the live entropy rate-tracking.

Convert ints to bools for the 'seeded' logic.

Move _write() function from the algorithm-specific areas to randomdev.c

Get rid of reseed() function - it is unused.

Tidy up the opt_*.h includes.

Update documentation for random(4) modules.

Fix test program (reviewers, please leave this).

Differential Revision:    https://reviews.freebsd.org/D3354
Reviewed by:              wblock,delphij,jmg,bjk
Approved by:              so (/dev/random blanket)

1 files changed, 15 insertions, 0 deletions

diff --git a/UPDATING b/UPDATING
index cf93fa5b5df2..5464745a9a84 100644
--- a/UPDATING
+++ b/UPDATING
@@ -31,6 +31,21 @@ NOTE TO PEOPLE WHO THINK THAT FreeBSD 11.x IS SLOW:
 	disable the most expensive debugging functionality run
 	"ln -s 'abort:false,junk:false' /etc/malloc.conf".)
 
+20150817:
+	Kernel-loadable modules for the random(4) device are back. To use
+	them, the kernel must have
+
+	device	random
+	options	RANDOM_LOADABLE
+
+	kldload(8) can then be used to load random_fortuna.ko
+	or random_yarrow.ko. Please note that due to the indirect
+	function calls that the loadable modules need to provide,
+	the build-in variants will be slightly more efficient.
+
+	The random(4) kernel option RANDOM_DUMMY has been retired due to
+	unpopularity. It was not all that useful anyway.
+
 20150813:
 	The WITHOUT_ELFTOOLCHAIN_TOOLS src.conf(5) knob has been retired.
 	Control over building the ELF Tool Chain tools is now provided by