linux-kernel - Re: [PATCH] crypto: tcrypt: add option to not exit on success

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Date:	Wed, 13 May 2009 09:12:46 -0400
From:	Jarod Wilson <jarod@...hat.com>
To:	Herbert Xu <herbert@...dor.apana.org.au>
Cc:	Neil Horman <nhorman@...driver.com>, linux-crypto@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] crypto: tcrypt: add option to not exit on success

On Wednesday 13 May 2009 07:38:19 Herbert Xu wrote:
> On Wed, May 13, 2009 at 07:08:26AM -0400, Neil Horman wrote:
> >
> > Not really sure I agree with the logic here.  I agree that its pretty clear that
> > its major value is for quickly testing all the algorithms in a system, but
> > universally failing the loading of the module simply to save a few milliseconds
> > seems like a poor choice.  In so doing you create an alias effect, as jarod
> > noted between a non-existent module and a module that failed to load.  The
> > aliasing can be resolved, if you want to parse dmesg, but if speed is the issue
> > at hand, that parsing is a significant impact.  If you allow the module to load
> > properly, then for the cost of an rmmod, you can tell simply from the exit code
> > of modprobe:
> > 1) If the module was found 
> > 2) If the tests passed
> 
> As I said, tcrypt should no longer be used to test algorithms.
> Algorithms are tested as they load, with the result available
> in /proc/crypto.  tcrypt is just a relic that will be going away.
> 
> Do not rely on it.

Hm... FIPS has the requirement that we test all algs before we use any
algs, self-tests on demand before first use for each alg is
insufficient. At first blush, I'm not seeing how we ensure this
happens. How can we trigger a cbc(des3_ede) self-test from userspace?
I see that modprobe'ing des.ko runs the base des and des3_ede
self-tests, but modprobe'ing cbc.ko doesn't lead to any self-tests
being run.

-- 
Jarod Wilson
jarod@...hat.com
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