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

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Message-ID: <2639082.PtrrGWOPPL@positron.chronox.de>
Date:   Sun, 18 Jun 2017 10:04:58 +0200
From:   Stephan Müller <smueller@...onox.de>
To:     Lee Duncan <lduncan@...e.com>
Cc:     "Jason A. Donenfeld" <Jason@...c4.com>,
        Theodore Ts'o <tytso@....edu>,
        Linux Crypto Mailing List <linux-crypto@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        kernel-hardening@...ts.openwall.com,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        David Miller <davem@...emloft.net>,
        Eric Biggers <ebiggers3@...il.com>,
        "Nicholas A. Bellinger" <nab@...ux-iscsi.org>,
        Chris Leech <cleech@...hat.com>, open-iscsi@...glegroups.com
Subject: Re: [kernel-hardening] Re: [PATCH v4 06/13] iscsi: ensure RNG is seeded before use

Am Samstag, 17. Juni 2017, 05:45:57 CEST schrieb Lee Duncan:

Hi Lee,

> In your testing, how long might a process have to wait? Are we talking
> seconds? Longer? What about timeouts?
>

In current kernels (starting with 4.8) this timeout should clear within a few 
seconds after boot.

In older kernels (pre 4.8), my KVM takes up to 90 seconds to reach that 
seeding point. I have heard that on IBM System Z this trigger point requires 
minutes to be reached.

Ciao
Stephan