CVS commit: [netbsd-6] src/sys

["Jeff Rizzo" <riz%netbsd.org@localhost>]

Module Name:    src
Committed By:   riz
Date:           Thu Apr 19 19:59:11 UTC 2012

Modified Files:
        src/sys/dev [netbsd-6]: rndpseudo.c
        src/sys/kern [netbsd-6]: kern_rndq.c subr_cprng.c
        src/sys/lib/libkern [netbsd-6]: arc4random.c
        src/sys/sys [netbsd-6]: rnd.h

Log Message:
Pull up following revision(s) (requested by tls in ticket #185):
        sys/kern/subr_cprng.c: revision 1.6
        sys/kern/subr_cprng.c: revision 1.7
        sys/lib/libkern/arc4random.c: revision 1.32
        sys/kern/kern_rndq.c: revision 1.2
        sys/dev/rndpseudo.c: revision 1.7
        sys/sys/rnd.h: revision 1.30
Add a spin mutex to the rndsink structure; it is used to avoid lock
ordering and sleep-holding-locks problems when rekeying, and thus
to avoid a nasty race between cprng destruction and reseeding.
Fix LOCKDEBUG problems pointed out by drochner@
1) Lock ordering in cprng_strong_destroy had us take a spin mutex then
   an adaptive mutex.  Can't do that.  Reordering this requires changing
   cprng_strong_reseed to tryenter the cprng's own mutex and skip the
   reseed on failure, or we could deadlock.
2) Can't free memory with a valid mutex in it.
reorder initialization to improve error handling in case the system
runs out of file descriptors, avoids LOCKDEBUG panic due to double
mutex initialization


To generate a diff of this commit:
cvs rdiff -u -r1.6 -r1.6.2.1 src/sys/dev/rndpseudo.c
cvs rdiff -u -r1.1 -r1.1.2.1 src/sys/kern/kern_rndq.c
cvs rdiff -u -r1.5 -r1.5.2.1 src/sys/kern/subr_cprng.c
cvs rdiff -u -r1.31 -r1.31.2.1 src/sys/lib/libkern/arc4random.c
cvs rdiff -u -r1.29 -r1.29.2.1 src/sys/sys/rnd.h

Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.