linux-kernel - Re: [RFC PATCH v12 1/4] crypto: make Jitter RNG directly accessible

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Message-ID: <CAK8P3a3687Na9Rhi78_46trr94_kPjCFzTCWFJrzUGo90bwN6w@mail.gmail.com>
Date:   Tue, 18 Jul 2017 11:16:10 +0200
From:   Arnd Bergmann <arnd@...db.de>
To:     Stephan Müller <smueller@...onox.de>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Jason A. Donenfeld" <jason@...c4.com>,
        linux-crypto@...r.kernel.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [RFC PATCH v12 1/4] crypto: make Jitter RNG directly accessible

On Tue, Jul 18, 2017 at 11:10 AM, Stephan Müller <smueller@...onox.de> wrote:
> Am Dienstag, 18. Juli 2017, 11:02:02 CEST schrieb Arnd Bergmann:
>
> Hi Arnd,
>>
>> I can see why the jitterentropy implementation avoids using kernel headers,
>> the problem now is that part of it gets moved into a new header, and that
>> already violates the original principle.
>>
>> From my reading of the code, we could probably leave the structure
>> definition in the crypto/jitterentropy.c, and have the statically
>> allocated instance in the same file when CONFIG_LRNG is
>> set,
>
> That is a very good idea -- I will implement this approach.

I guess ideally you just move the inner half of lrng_get_jent(),
i.e. everything inside of the spinlock, plus the buffer, into that file.
That should keep the low-level side separate from the caller.

      Arnd