Antw: Re: [kernel-hardening] Re: [PATCH v4 06/13] iscsi: ensure RNG is seeded before use

From	"Ulrich Windl" <Ulrich.Windl@rz.uni-regensburg.de>
Newsgroups	linux.kernel
Subject	Antw: Re: [kernel-hardening] Re: [PATCH v4 06/13] iscsi: ensure RNG is seeded before use
Date	2017-07-05 09:20 +0200
Message-ID	<tZMLo-3av-15@gated-at.bofh.it> (permalink)
References	(3 earlier) <tQ4zT-48O-3@gated-at.bofh.it> <tT7rz-5Uk-7@gated-at.bofh.it> <tTa65-7Jj-7@gated-at.bofh.it> <tTcUi-1gh-13@gated-at.bofh.it> <tTmTD-8lq-1@gated-at.bofh.it>
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>>> Jeffrey Walton <noloader@gmail.com> schrieb am 17.06.2017 um 16:23 in Nachricht
<CAH8yC8nHX2r9cfQ0gNeJAUrgSfAS8V16dVHv35BRnLn-YprZCg@mail.gmail.com>:

[...]
> But its not clear to me how to ensure uniqueness when its based on
> randomness from the generators.

Even with a perfect random generator non-unique values are possible (that's why it's random). It's unlikely, but it can happen. The question is whether the probability of non-unique values from /dev/urandom is any higher than that for values read from /dev/random. One _might_ be able to predict the values from /dev/urandom.

Regards,
Ulrich

> 
> Jeff
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Antw: Re: [kernel-hardening] Re: [PATCH v4 06/13] iscsi:  ensure RNG is seeded before use "Ulrich Windl" <Ulrich.Windl@rz.uni-regensburg.de> - 2017-07-05 09:20 +0200
  Re: Antw: Re: [kernel-hardening] Re: [PATCH v4 06/13] iscsi: ensure RNG is seeded before use Paul Koning <paulkoning@comcast.net> - 2017-07-05 15:20 +0200
    Re: Antw: Re: [kernel-hardening] Re: [PATCH v4 06/13] iscsi: ensure  RNG is seeded before use Theodore Ts'o <tytso@mit.edu> - 2017-07-05 19:40 +0200

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