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

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Message-Id: <595C9079020000A100026F37@gwsmtp1.uni-regensburg.de>
Date:   Wed, 05 Jul 2017 09:08:41 +0200
From:   "Ulrich Windl" <Ulrich.Windl@...uni-regensburg.de>
To:     "Lee Duncan" <lduncan@...e.com>
Cc:     "David Miller" <davem@...emloft.net>,
        "Eric Biggers" <ebiggers3@...il.com>,
        "open-iscsi" <open-iscsi@...glegroups.com>,
        "Nicholas A.Bellinger" <nab@...ux-iscsi.org>,
        "Greg Kroah-Hartman" <gregkh@...uxfoundation.org>,
        "kernel-hardening@...ts.openwall.com" 
        <kernel-hardening@...ts.openwall.com>, "Ted Ts'o" <tytso@....edu>,
        "Chris Leech" <cleech@...hat.com>,
        "Linux Crypto Mailing List" <linux-crypto@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>,
        "Jason A.Donenfeld" <Jason@...c4.com>
Subject: Antw: Re: [kernel-hardening] Re: [PATCH v4 06/13] iscsi:
 ensure RNG is seeded before use

>>> Jeffrey Walton <noloader@...il.com> schrieb am 17.06.2017 um 16:23 in Nachricht
<CAH8yC8nHX2r9cfQ0gNeJAUrgSfAS8V16dVHv35BRnLn-YprZCg@...l.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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