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List:       freebsd-hackers
Subject:    Re: Limits to seeding /dev/random | random(4)
From:       Dirk-Willem van Gulik <dirkx () webweaving ! org>
Date:       2018-07-13 15:11:51
Message-ID: 84E1C233-5855-43DC-BC58-CAFFA216D1D7 () webweaving ! org
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> On 13 Jul 2018, at 15:51, Ian Lepore <ian@freebsd.org> wrote:
> 
> On Thu, 2018-07-12 at 11:40 -0700, Conrad Meyer wrote:
>> Identical results are very troubling.  Maybe your readonly
>> filesystems
>> contain a static "entropy" file that is being fed in every boot (with

Most certainly not.

>> identical contents)?  If so, you definitely want to remove that
>> during
>> image generation.  That, in tandem with few other sources of entropy,
>> could explain identical results.

I suspect this to be the issue.
> 
> I have been reporting for years that certain kinds of embedded systems
> lead to zero entropy available at boot, including the fact that the
..
> It happens. Embedded systems are a different world, and if entropy is
> important, sometimes we have to go out of our way to provide some.

In our case it is merely a low end machine - but diskless, read-only and with hardly any perifials.

Dw.
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