Date: Sat, 15 Sep 2012 01:07:13 +0100 From: RW <rwmaillists@googlemail.com> To: Ben Laurie <benl@freebsd.org> Cc: Arthur Mesh <arthurmesh@gmail.com>, Lepore <freebsd@damnhippie.dyndns.org>, Ian, Doug Barton <dougb@freebsd.org>, freebsd-security@freebsd.org, "Bjoern A. Zeeb" <bz@freebsd.org> Subject: Re: svn commit: r239569 - head/etc/rc.d Message-ID: <20120915010713.492c65a0@gumby.homeunix.com> In-Reply-To: <CAG5KPzyHkR_n8O38gqx8mLFykhur4BORWmG17BVpx9Hruktfig@mail.gmail.com> References: <50453686.9090100@FreeBSD.org> <20120911082309.GD72584@dragon.NUXI.org> <504F0687.7020309@FreeBSD.org> <201209121628.18088.jhb@freebsd.org> <5050F477.8060409@FreeBSD.org> <20120912213141.GI14077@x96.org> <20120913052431.GA15052@dragon.NUXI.org> <alpine.BSF.2.00.1209131258210.13080@ai.fobar.qr> <alpine.BSF.2.00.1209141336170.13080@ai.fobar.qr> <CAG5KPzyngKFNMoPKmfKg%2BQLkGPj0oMX8YYp0qQNHgKTSH4afHQ@mail.gmail.com> <20120914154617.39025ac0@gumby.homeunix.com> <CAG5KPzyHkR_n8O38gqx8mLFykhur4BORWmG17BVpx9Hruktfig@mail.gmail.com>
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On Fri, 14 Sep 2012 17:25:59 +0100 Ben Laurie wrote: > On Fri, Sep 14, 2012 at 3:46 PM, RW <rwmaillists@googlemail.com> > wrote: > > On Fri, 14 Sep 2012 14:43:53 +0100 > > Ben Laurie wrote: > > > >> On Fri, Sep 14, 2012 at 2:38 PM, Bjoern A. Zeeb <bz@freebsd.org> > >> wrote: > >> > 7) send all data to the kernel and hash (arch dependent?) it + > >> > counter value into the buffer on overflow, as in b[n] = H(b[n] + > >> > c > >> > + i[n]) in the kernel > >> > (can control when buffer full and only then take action when > >> > needed, indepedent on how seed data is chosen, uses standard > >> > technology) > >> > >> IMO, this is the only good option. > > > > No it isn't. I means that the hashing is unconditional, so anyone > > that needs a faster boot needs to patch the kernel. > > Has anyone measured the cost of doing this? Also, if you really want > to turn it off, we could provide a flag. Yes, read the thread. > > It has no advantage > > whatsoever over a minor change to initrandom. > > It absolutely has. It applies to all inputs to /dev/random, not just > those that come from initrandom. If the rc script are written correctly it shouldn't matter, there no need to write to /dev/random after the boot - it wont do anything useful. It has no advantage over hashing the low-grade entropy in userland which is is just couple of lines difference in a shell script. > Also, should something get to write > to it before initrandom, initrandom's input would still be used. There's no reason to do that, so why do you think it matter?
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