linux-kernel - Re: [PATCH] crypto: use list to stage async seeding requests

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Date:	Tue, 9 Jun 2015 14:49:55 +0800
From:	Herbert Xu <herbert@...dor.apana.org.au>
To:	Stephan Mueller <smueller@...onox.de>
Cc:	Ted Tso <tytso@....edu>, andreas.steffen@...ongswan.org,
	sandyinchina@...il.com, linux-crypto@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] crypto: use list to stage async seeding requests

On Sat, Jun 06, 2015 at 04:16:54AM +0200, Stephan Mueller wrote:
> This patch uses a list to track the asynchronous seeding requests until
> the nonblocking pool is fully initialized. The random.c is provided with
> two API calls: the get_blocking_random_bytes_cb allows the caller to
> provide a callback function that is triggered once the nonblocking pool
> is initialized. If the nonblocking pool is already initialized at the
> time of invocation, the function is a noop. The second API call of
> get_blocking_random_bytes_cancel allows the caller to cancel an
> outstanding request.
> 
> The previous approach used a waitqueue for maintaining the requests
> until the nonblocking pool is initialized. In some circumstances, the
> wait can be very long (in the orders of minutes) where the use of
> waitqueues is not appropriate.
> 
> The patch also removes the entropy buffer registered with the DRBG
> handle in favor of stack variables to hold the seed data.
> 
> CC: Andreas Steffen <andreas.steffen@...ongswan.org>
> CC: Theodore Ts'o <tytso@....edu>
> CC: Sandy Harris <sandyinchina@...il.com>
> Signed-off-by: Stephan Mueller <smueller@...onox.de>

This patch still has many issues with repsect to work cancellation.
I've decided to do this myself.  I will post the result once I have
done some testing.

Thanks,
-- 
Email: Herbert Xu <herbert@...dor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt
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