linux-kernel - Re: [v2] RANDOM: ATH9K RNG delivers zero bits of entropy

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Message-ID: <2ba03f89daee4f09a88a1238943eb49d@euamsexm01a.eu.qualcomm.com>
Date:   Tue, 27 Sep 2016 16:44:16 +0200
From:   Kalle Valo <kvalo@....qualcomm.com>
To:     Stephan Mueller <smueller@...onox.de>
CC:     Ted Tso <tytso@....edu>, <herbert@...dor.apana.org.au>,
        <linux-kernel@...r.kernel.org>, <linux-crypto@...r.kernel.org>,
        <ath9k-devel@....qualcomm.com>, <linux-wireless@...r.kernel.org>,
        <ath9k-devel@...ts.ath9k.org>, Kalle Valo <kvalo@...eaurora.org>,
        "Jason Cooper" <jason@...edaemon.net>
Subject: Re: [v2] RANDOM: ATH9K RNG delivers zero bits of entropy

Stephan Mueller <smueller@...onox.de> wrote:
> The ATH9K driver implements an RNG which is completely bypassing the
> standard Linux HW generator logic.
> 
> The RNG may or may not deliver entropy. Considering the conservative
> approach in treating entropy with respect to non-auditable sources, this
> patch changes the delivered entropy value to zero. The RNG still feeds
> data into the input_pool but it is assumed to have no entropy.
> 
> When the ATH9K RNG changes to use the HW RNG framework, it may re-enable
> the entropy estimation considering that a user can change that value at
> boot and runtime.
> 
> Reviewed-by: Jason Cooper <jason@...edaemon.net>
> Signed-off-by: Stephan Mueller <smueller@...onox.de>

Based on the discussion I'm dropping this patch. But the discussion was
hard to follow so please let me know if I misunderstood.

Patch set to Rejected.

-- 
https://patchwork.kernel.org/patch/9266265/

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