Date: Sun, 2 Feb 2003 12:27:18 +0300 From: "Andrey A. Chernov" <ache@nagual.pp.ru> To: Kris Kennaway <kris@obsecurity.org> Cc: current@FreeBSD.org Subject: Re: rand() is broken Message-ID: <20030202092718.GA60116@nagual.pp.ru> In-Reply-To: <20030202091106.GA72723@rot13.obsecurity.org> References: <20030202070644.GA9987@rot13.obsecurity.org> <20030202090422.GA59750@nagual.pp.ru> <20030202091106.GA72723@rot13.obsecurity.org>
next in thread | previous in thread | raw e-mail | index | archive | help
--SUOF0GtieIMvvwua Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Sun, Feb 02, 2003 at 01:11:06 -0800, Kris Kennaway wrote: >=20 > Another problem (noticed by tjr) is that once the sequence hits '0' it > jumps to INT_MAX and stays there forever. For example, seeding with > srand(0) produces nothing but INT_MAX from rand(). >=20 > It looks like a lot more validation of this PRNG is needed. Don't have an idea about this thing yet, maybe some sign or variable size= =20 change fix required. BTW, note that new formulae also used in the kernel (by BSD developers) and taken from there - libkern/random.c - so all you say is true there too. --=20 Andrey A. Chernov http://ache.pp.ru/ --SUOF0GtieIMvvwua Content-Type: application/pgp-signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.2.0 (FreeBSD) iQCVAwUBPjzkduJgpPLZnQjrAQHveAP/VcFwDHdMfrWbAcc6r2j4Kyb4niIz3vp2 9rW9/JjGsxTchj73mf7h/zET1klZ1JOjn42r7+svIkdiwBpiHlvVx9Z4h0tx+16W VHPK15tmiQHxbao55jALioe2PU/qm5/n5JzWtP7EYCh+UphngLx9ejZguwgVw1uM SGOVeq1y1oE= =2jVo -----END PGP SIGNATURE----- --SUOF0GtieIMvvwua-- To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?20030202092718.GA60116>