netdev - Re: [PATCH] Add IRQF_SAMPLE_RANDOM Flag to forcedeth

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Date:	Sat, 09 Oct 2010 20:15:01 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	bhutchings@...arflare.com
Cc:	linuxrocks123@...scape.net, netdev@...r.kernel.org
Subject: Re: [PATCH] Add IRQF_SAMPLE_RANDOM Flag to forcedeth

From: Ben Hutchings <bhutchings@...arflare.com>
Date: Sun, 10 Oct 2010 02:09:24 +0100

> Patrick Simmons wrote:
>> This patch adds the IRQF_SAMPLE_RANDOM flag to the forcedeth driver, 
>> allowing the interrupt timing for forcedeth to be used for entropy 
>> generation.  This should help /dev/random generate more secure random 
>> numbers on machines using this driver.
> [...]
> 
> We don't enable this for network drivers any more because:
> 
> 1. At high packet rates, interrupt moderation makes interrupts very
> regular.
> 2. At low packet rates, a malicious sender can control the interrupt
> timing.

Agreed on all counts, I'm not applying this patch.
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