linux-kernel - Re: [PATCH 2/2] random: Account for entropy loss due to overwrites

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Date:	Thu, 25 Apr 2013 07:38:23 -0700
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	"Ted Ts'o" <tytso@....edu>, DJ Johnston <dj.johnston@...el.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	"H. Peter Anvin" <hpa@...ux.intel.com>,
	stable <stable@...r.kernel.org>
Subject: Re: [PATCH 2/2] random: Account for entropy loss due to overwrites

This doesn't work AT ALL. You even hint at the reason why in your message.

On Tue, Apr 23, 2013 at 9:26 PM, H. Peter Anvin <hpa@...or.com> wrote:
>
> As such, this conservatism seems more than justified.  Note, however,
> that attempting to add one bit of entropy will never succeed; nor will
> two bits unless the pool is completely empty.  These roundoff
> artifacts could be improved by using fixed-point arithmetic and adding
> some number of fractional entropy bits.

Take a look at "add_interrupt_randomness()". Hmm..

                Linus
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