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From: Nikos Mavrogiannopoulos <n.mavrogiannopoulos@gmail.com>
To: Steve Grubb <sgrubb@redhat.com>
Cc: Ted Ts'o <tytso@mit.edu>, Jarod Wilson <jarod@redhat.com>,
	Sasha Levin <levinsasha928@gmail.com>,
	linux-crypto@vger.kernel.org, Matt Mackall <mpm@selenic.com>,
	Neil Horman <nhorman@redhat.com>,
	Herbert Xu <herbert.xu@redhat.com>,
	Stephan Mueller <stephan.mueller@atsec.com>,
	lkml <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH] random: add blocking facility to urandom
Date: Wed, 07 Sep 2011 23:20:48 +0200	[thread overview]
Message-ID: <4E67E030.1020702@gmail.com> (raw)
In-Reply-To: <201109071602.24519.sgrubb@redhat.com>

On 09/07/2011 10:02 PM, Steve Grubb wrote:

> When a system is underattack, do you really want to be using a PRNG
> for anything like seeding openssl? Because a PRNG is what urandom
> degrades into when its attacked.

Using a PRNG is not a problem. Making sure it is well seeded and no
input from the attacker can compromise its state are the difficult
parts. Making predictable estimates and blocking when your estimates are
off, makes it a good target for DoS. When your system is under attack,
you want to use your services. If they block then the attack might
have just been successful.

regards,
Nikos

  parent reply	other threads:[~2011-09-07 21:20 UTC|newest]

Thread overview: 62+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2011-09-02 14:37 [PATCH] random: add blocking facility to urandom Jarod Wilson
2011-09-05  2:36 ` Sandy Harris
2011-09-06 14:09   ` Stephan Mueller
2011-09-07 17:38 ` Jarod Wilson
2011-09-07 18:12   ` Sasha Levin
2011-09-07 18:26     ` Jarod Wilson
2011-09-07 19:05       ` Sasha Levin
2011-09-07 19:30         ` Jarod Wilson
2011-09-07 20:00           ` Sasha Levin
2011-09-07 19:35         ` Neil Horman
2011-09-07 19:27       ` Ted Ts'o
2011-09-07 19:36         ` Jarod Wilson
2011-09-07 19:36           ` Jarod Wilson
2011-09-08  2:43           ` Sandy Harris
2011-09-07 19:49         ` David Miller
2011-09-07 20:02         ` Steve Grubb
2011-09-07 20:23           ` Sasha Levin
2011-09-07 20:30             ` Steve Grubb
2011-09-07 20:37               ` Sasha Levin
2011-09-07 20:56                 ` Steve Grubb
2011-09-07 21:10                   ` Sasha Levin
2011-09-07 21:28                     ` Steve Grubb
2011-09-07 21:38                       ` Sasha Levin
2011-09-07 21:35                     ` Jarod Wilson
2011-09-07 21:43                       ` Steve Grubb
2011-09-07 22:46                         ` Sven-Haegar Koch
2011-09-08  7:21                         ` Sasha Levin
2011-09-07 23:57                   ` Neil Horman
2011-09-08  6:41                     ` Tomas Mraz
2011-09-08 12:52                       ` Neil Horman
2011-09-08 13:11                         ` Steve Grubb
2011-09-08 13:49                           ` Neil Horman
2011-09-09  2:21                           ` Sandy Harris
2011-09-09 13:04                             ` Steve Grubb
2011-09-09 16:25                               ` Ted Ts'o
2011-09-09 21:27                               ` Thomas Gleixner
2011-09-12 13:56                                 ` Jarod Wilson
2011-09-13 10:58                                   ` Peter Zijlstra
2011-09-13 12:18                                     ` Jarod Wilson
2011-09-11  2:05                             ` Valdis.Kletnieks
2011-09-12 13:55                               ` Jarod Wilson
2011-09-12 16:58                                 ` Valdis.Kletnieks
2011-09-12 18:26                                   ` Jarod Wilson
2011-09-07 20:33           ` Neil Horman
2011-09-07 20:48             ` Steve Grubb
2011-09-07 21:18           ` Ted Ts'o
2011-09-07 21:27             ` Stephan Mueller
2011-09-07 21:27               ` Stephan Mueller
2011-09-07 21:38               ` Ted Ts'o
2011-09-08  8:44               ` Christoph Hellwig
2011-09-08 11:48                 ` Steve Grubb
2011-09-08 16:13                   ` David Miller
2011-09-09 19:08                     ` Eric Paris
2011-09-09 19:12                       ` Neil Horman
2011-09-08  8:42             ` Christoph Hellwig
2011-09-08  8:42               ` Christoph Hellwig
2011-09-07 21:20           ` Nikos Mavrogiannopoulos [this message]
2011-09-08  8:41           ` Christoph Hellwig
2011-09-12 14:02         ` Jarod Wilson
2011-09-12 14:02           ` Jarod Wilson
2011-09-12 14:58           ` Neil Horman
2011-09-12 17:06           ` Mark Brown

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