linux-kernel - Re: [PATCH v4] security/keys: rewrite all of big

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Message-ID: <2681038.03lnYPhpsa@tauon.chronox.de>
Date:   Mon, 18 Sep 2017 10:49:56 +0200
From:   Stephan Mueller <smueller@...onox.de>
To:     "Jason A. Donenfeld" <Jason@...c4.com>
Cc:     linux-security-module@...r.kernel.org, keyrings@...r.kernel.org,
        kernel-hardening@...ts.openwall.com, linux-kernel@...r.kernel.org,
        dhowells@...hat.com, ebiggers3@...il.com,
        Herbert Xu <herbert@...dor.apana.org.au>,
        Kirill Marinushkin <k.marinushkin@...il.com>,
        Ard Biesheuvel <ard.biesheuvel@...aro.org>,
        Ilhan Gurel <ilhan.gurel@...il.com>, security@...nel.org,
        stable@...r.kernel.org
Subject: Re: [PATCH v4] security/keys: rewrite all of big_key crypto

Am Samstag, 16. September 2017, 15:00:34 CEST schrieb Jason A. Donenfeld:

Hi Jason,

> This started out as just replacing the use of crypto/rng with
> get_random_bytes_wait, 

This change is a challenge. The use of the kernel crypto API's DRNG has been 
made to allow FIPS 140-2 compliance. Otherwise, the entire key generation 
logic will not be using the right(TM) DRNG. Thus, I would not suggest to 
replace that for a stable tree.

Note, I am currently working on a pluggable DRNG apporach for /dev/random and 
/dev/urandom to be able to get rid of the use of the kernel crypto API's DRNG 
API. It is ready and I will air that solution shortly. Yet, it needs work to 
be integrated upstream (and approval from Ted Tso).

Ciao
Stephan