看板FB_security
标 题Re: Collecting entropy from device_attach() times.
发信站NCTU CS FreeBSD Server (Sat Sep 22 19:19:08 2012)
转信站ptt!csnews.cs.nctu!news.cs.nctu!FreeBSD.cs.nctu!freebsd.org!owner-free
--FkmkrVfFsRoUs1wW
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
Content-Transfer-Encoding: quoted-printable
On Wed, Sep 19, 2012 at 07:28:36PM +0100, RW wrote:
> On Tue, 18 Sep 2012 23:14:22 +0200
> Pawel Jakub Dawidek wrote:
>=20
> > Hi.
> >=20
>=20
> > The patch is here:
> >=20
> > http://people.freebsd.org/~pjd/patches/harvest_device_attach.patch
> >=20
> > Comments?
> >=20
>=20
> + attachtime =3D get_cyclecount() - attachtime;
>=20
> the above line is redundant since random_harvest() already contains a
> call to get_cyclecount().
Agreed, although in more recent patch I need total time, so I can
calculate how many bits it has, so I can estimate how much entropy there
is.
--=20
Pawel Jakub Dawidek
http://www.wheelsystems.com
FreeBSD committer
http://www.FreeBSD.org
Am I Evil? Yes, I Am!
http://tupytaj.pl
--FkmkrVfFsRoUs1wW
Content-Type: application/pgp-signature
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v2.0.19 (FreeBSD)
iEYEARECAAYFAlBdgowACgkQForvXbEpPzT6LwCfQnX0XeMrJq57lGnxeFats/yo
I6gAoOgyrhyRS4jBmCbwjAl9Ma6YzJFR
=jesV
-----END PGP SIGNATURE-----
--FkmkrVfFsRoUs1wW--