linux-kernel - Re: [PATCH] drivers/net: remove network drivers' last few uses of IRQF_SAMPLE

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Message-ID:  <m33ao689gm.fsf@ursa.amorsen.dk>
Date:	Sun, 25 May 2008 21:33:45 +0200
From:	Benny Amorsen <benny+usenet@...rsen.dk>
To:	linux-kernel@...r.kernel.org
Cc:	netdev@...r.kernel.org
Subject:  Re: [PATCH] drivers/net: remove network drivers' last few uses of IRQF_SAMPLE_RANDOM

Glen Turner <gdt@....id.au> writes:

> On Fri, 2008-05-16 at 22:34 +0200, Benny Amorsen wrote:
>
>> Perhaps it would be possible to make most types of interrupts add
>> entropy, but not credit any entropy?
>
> You need to be certain that those sources are not able
> to be influenced by a hostile party, otherwise the entropy
> pool can be degraded to be less random over successive samples
> than its entropy score suggests.

Not if we don't credit any entropy. /dev/random is engineered to be
safe against getting non-random input, as long as that input isn't
credited with entropy. /dev/random is even world writable by default.


/Benny


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