Add type qualifier volatile to the base (userspace) address argument
of fuword(9) and suword(9).  This makes the functions type-compatible
with volatile objects and does not require devolatile force, e.g. in
kern_umtx.c.

Requested by:	bde
Reviewed by:	jhb
Sponsored by:	The FreeBSD Foundation
MFC after:	3 weeks
Clean up the types of a few strings to make them const when they are never
written to.
The command name is a constant, use the correct type.

MFC after:	1 week
PTRACE: Bringing small hardening in libproc for dtrace.
Fix the gpiobus locking by using a more sane model where it isn't necessary
hold the gpiobus lock between the gpio calls.

gpiobus_acquire_lock() now accepts a third parameter which tells gpiobus
what to do when the bus is already busy.

When GPIOBUS_WAIT wait is used, the calling thread will be put to sleep
until the bus became free.

With GPIOBUS_DONTWAIT the calling thread will receive EWOULDBLOCK right
away and then it can act upon.

This fixes the gpioiic(4) locking issues that arises when doing multiple
concurrent access on the bus.
Change the default log level for iSCSI target from 3 to 1.  It should
have been 1 from the beginning; not sure how it ended up at 3.

MFC after:	1 month
Sponsored by:	The FreeBSD Foundation
rc.d/geli should not depend on random, as the attach functionality
do not require additional entropy to function.

It would create a circular dependency (not immediately obvious:
geli provides 'disks' and requires 'random' as of r273872,
'random' requires 'FILESYSTEMS', 'FILESYSTEMS' requires 'root',
'root' requires 'swap', and finally 'swap' requires 'disk').
sh: Fix corruption of CTL* bytes in positional parameters in redirection.

EXP_REDIR was not being checked for while expanding positional parameters in
redirection, so CTL* bytes were not being prefixed where they should be.

MFC after:	1 week
Merge remote-tracking branch 'freebsd/master' into hardened/current/master
Merge remote-tracking branch 'origin/hardened/current/master' into hardened/current/hardening
Merge remote-tracking branch 'origin/hardened/current/master' into hardened/current/segvguard
Merge remote-tracking branch 'origin/hardened/current/master' into hardened/current/ptrace
Merge remote-tracking branch 'origin/hardened/current/master' into hardened/current/log
Merge remote-tracking branch 'origin/hardened/current/master' into hardened/current/userlandenhanced
Merge remote-tracking branch 'origin/hardened/current/master' into hardened/current/chacha
Merge remote-tracking branch 'origin/hardened/current/master' into hardened/current/pie
Merge remote-tracking branch 'origin/hardened/current/master' into hardened/current/unstable
Merge remote-tracking branch 'origin/hardened/current/hardening' into hardened/current/unstable
Merge remote-tracking branch 'origin/hardened/current/segvguard' into hardened/current/unstable
Merge remote-tracking branch 'origin/hardened/current/ptrace' into hardened/current/unstable