On Oct 30, 2014, at 14:21, Mark Murray <ma...@freebsd.org> wrote: > Author: markm > Date: Thu Oct 30 21:21:53 2014 > New Revision: 273872 > URL: https://svnweb.freebsd.org/changeset/base/273872 > > Log: > 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)
Hi Mark, Could you please add an UPDATING entry for this? Some users (like me) who do make installworld from old kernels are experiencing issues (some dealing with filesystem corruption). Please see this thread on -current@ for more details: https://lists.freebsd.org/pipermail/freebsd-current/2014-October/053039.html This also should have had “Relnotes: yes” in the commit message because this deserves to be put in the release notes for 11.0 Thanks!
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