Skip the smap sysctl instead of panicing if no kernel metadata can be
found.

Submitted by:	bde
MFC after:	3 days
This is the much-discussed major upgrade to the random(4) device, known to you all as /dev/random.

This code has had an extensive rewrite and a good series of reviews, both by the author and other parties. This means a lot of code has been simplified. Pluggable structures for high-rate entropy generators are available, and it is most definitely not the case that /dev/random can be driven by only a hardware souce any more. This has been designed out of the device. Hardware sources are stirred into the CSPRNG (Yarrow, Fortuna) like any other entropy source. Pluggable modules may be written by third parties for additional sources.

The harvesting structures and consequently the locking have been simplified. Entropy harvesting is done in a more general way (the documentation for this will follow). There is some GREAT entropy to be had in the UMA allocator, but it is disabled for now as messing with that is likely to annoy many people.

The venerable (but effective) Yarrow algorithm, which is no longer supported by its authors now has an alternative, Fortuna. For now, Yarrow is retained as the default algorithm, but this may be changed using a kernel option. It is intended to make Fortuna the default algorithm for 11.0. Interested parties are encouraged to read ISBN 978-0-470-47424-2 "Cryptography Engineering" By Ferguson, Schneier and Kohno for Fortuna's gory details. Heck, read it anyway.

Many thanks to Arthur Mesh who did early grunt work, and who got caught in the crossfire rather more than he deserved to.

My thanks also to folks who helped me thresh this out on whiteboards and in the odd "Hallway track", or otherwise.

My Nomex pants are on. Let the feedback commence!

Reviewed by:	trasz,des(partial),imp(partial?),rwatson(partial?)
Approved by:	so(des)
Use the right depend file for each program.

bsd.progs.mk generates a separate depend file for every program being
built, but then it does not properly tell each submake to use those
individual files.  Properly propagate the depend file to use.

Discovered while preparing the update of atf to 0.21 and noticing that
the test programs were not being relinked to the new library.

This change is "make tinderbox" clean.
Bump FreeBSD_version due to syscall*_register API changes in r273707
Use search method instead of fixed offsets for finding rootfs. This unbreaks
recent images for picostation by allowing to find rootfs at correct location.

Suggested by: loos
MFC after:	1 month
HBSD: fix upstream merge after Fortuna merge in FreeBSD head

Signed-off-by: Oliver Pinter <oliver.pntr@gmail.com>
Merge remote-tracking branch 'freebsd/master' into hardened/current/master
filedesc: tidy up fdcopy a little bit

Test for file availability by fde_file != NULL instead of fdisused, this is
consistent with similar checks later.

Drop badfileops check. badfileops don't have DFLAG_PASSABLE set, so it was never
reached in practice.

fdiused is now only used in some KASSERTS, so ifdef it under INVARIANTS.

No functional changes.
filedesc: tidy up fdfree

Implement fdefree_last variant and get rid of 'last' parameter.

No functional changes.
filedesc: iterate over fd table only once in fdcopy

While here add 'fdused_init' which does not perform unnecessary work.

Drop FILEDESC_LOCK_ASSERT from fdisused and rely on callers to hold
it when appropriate. This function is only used with INVARIANTS.

No functional changes intended.
filedesc: make fdinit return with source filedesc locked and new one sized
appropriately

Assert FILEDESC_XLOCK_ASSERT only for already used tables in fdgrowtable.
We don't have to call it with the lock held if we are just creating new
filedesc.

As a side note, strictly speaking processes can have fdtables with
fd_lastfile = -1, but then they cannot enter fdgrowtable. Very first file
descriptor they get will be 0 and the only syscall allowing to choose fd number
requires an active file descriptor. Should this ever change, we can add an 'init'
(or similar) parameter to fdgrowtable.
Build mount_nfs(8) with WARNS=6.

Reviewed by:	rmacklem@
MFC after:	1 month
Sponsored by:	The FreeBSD Foundation
filedesc: fix missed comments about fdsetugidsafety

While here just note that both fdsetugidsafety and fdcheckstd take sleepable
locks.
Only put one CTASSERT() inside each macro to avoid compile issues.
The problem is that the __LINE__ macro is constant inside a macro and
results in identical assert statements when the compiler does not
support the static builtin assert function.

MFC:		3 days
Sponsored by:	Mellanox Technologies
filedesc: drop retval argument from do_dup

It was almost always td_retval anyway.

For the one case where it is not, preserve the old value across the call.
Build ttm_agp_backend.c.

Reported by:	dumbbell
MFC after:	1 month
Merge remote-tracking branch 'freebsd/master' into hardened/current/master