Date: Sun, 2 Feb 2003 14:21:02 -0800 From: Kris Kennaway <kris@obsecurity.org> To: "Andrey A. Chernov" <ache@nagual.pp.ru> Cc: Kris Kennaway <kris@obsecurity.org>, Tim Robbins <tjr@FreeBSD.ORG>, current@FreeBSD.ORG Subject: Re: Final fix for 0 problem (was Re: rand() is broken) Message-ID: <20030202222101.GA75656@rot13.obsecurity.org> In-Reply-To: <20030202215539.GB68356@nagual.pp.ru> References: <20030202091106.GA72723@rot13.obsecurity.org> <20030202102621.GA60900@nagual.pp.ru> <20030202123035.GB62977@nagual.pp.ru> <20030203001735.A30440@dilbert.robbins.dropbear.id.au> <20030202134225.GA63673@nagual.pp.ru> <20030202140223.GA63836@nagual.pp.ru> <20030202141605.GA64157@nagual.pp.ru> <20030202151049.GA64866@nagual.pp.ru> <20030202210608.GA74910@rot13.obsecurity.org> <20030202215539.GB68356@nagual.pp.ru>
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[-- Attachment #1 --] On Mon, Feb 03, 2003 at 12:55:40AM +0300, Andrey A. Chernov wrote: > On Sun, Feb 02, 2003 at 13:06:08 -0800, Kris Kennaway wrote: > > On Sun, Feb 02, 2003 at 06:10:49PM +0300, Andrey A. Chernov wrote: > > > So far, this is final variant for 0 problem fixing ready for committing. > > > Any objections? > > > > What tests have you run on this code to ensure it doesn't still have > > strange problems? > > Uhm, I don't understand you well here. Any code can have strange problems, > nobody can be sure. Lets concentrate to this particular problem which I > call 0 problem. 0 seed is illegal by algorithm desing and BSD developers > try to made workaround, but their attempt was unsuccessful with result you > describe. Now successfull attempt comes. It not add any new bugs, because > value 0 simple mapped to another value (which could be any, but I choose > to not touch lower ones), which make generator non-stick at 0 again. If I understand correctly, this still doesn't solve the problem, because any PRNG sequence that hits the "magic" value will still get stuck there forever. Kris [-- Attachment #2 --] -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.2.1 (FreeBSD) iD8DBQE+PZnMWry0BWjoQKURAgHnAKC8WnxkEyKTjYtnoI9jUKfaPru9SgCg9KsY AfgIjxBsFYYuh0S8HvJo5Po= =gwbT -----END PGP SIGNATURE-----help
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