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

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Message-ID: <517942AB.1010201@zytor.com>
Date:	Thu, 25 Apr 2013 07:50:19 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	"Ted Ts'o" <tytso@....edu>
CC:	Linus Torvalds <torvalds@...ux-foundation.org>,
	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

On 04/25/2013 07:44 AM, H. Peter Anvin wrote:
> 
> OK, so we need to track fractional bits.
> 

Ted, Linus: there are two ways we can do this: we can either change the
credit_entropy_bits() interface to take some kind of fractional bits as
interface, or we can change the accounting internally.

The latter has the advantage of being a less invasive change, but the
former has the advantage of making it possible to credit sub-bit entropy.

Do you have a preference?  Otherwise I will probably write up the
internal change for now.

	-hpa

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