linux-kernel - Re: [PATCH] Use kzfree in crypto API context initialization and key/iv handling

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Message-ID: <20090601085814.3e010533@lxorguk.ukuu.org.uk>
Date:	Mon, 1 Jun 2009 08:58:14 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Herbert Xu <herbert@...dor.apana.org.au>
Cc:	David Miller <davem@...emloft.net>, riel@...hat.com,
	research@...reption.com, linux-kernel@...r.kernel.org,
	pageexec@...email.hu, linux-mm@...ck.org, torvalds@...l.org,
	linux-crypto@...r.kernel.org
Subject: Re: [PATCH] Use kzfree in crypto API context initialization and
 key/iv handling

On Mon, 1 Jun 2009 14:48:37 +1000
Herbert Xu <herbert@...dor.apana.org.au> wrote:

> On Sun, May 31, 2009 at 09:46:23PM -0700, David Miller wrote:
> > 
> > I don't even want to think about what this does to IPSEC rule creation
> > rates, that that matters heavily for cell phone networks where
> > hundreds of thousands of nodes come in and out of the server and each
> > such entry requires creating 4 IPSEC rules.
> 
> I completely agree.  The zeroing of metadata is gratuitous.

Zeroing long term keys makes sense but for the short lifepsan keys used on
the wire its a bit pointless irrespective of speed (I suspect done
properly the performance impact would be close to nil anyway)

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