linux-kernel - Re: [PATCH,RFC] random: collect cpu randomness

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Message-ID: <alpine.LFD.2.10.1402032149530.3940@eddie.linux-mips.org>
Date:	Mon, 3 Feb 2014 21:54:22 +0000 (GMT)
From:	"Maciej W. Rozycki" <macro@...ux-mips.org>
To:	Theodore Ts'o <tytso@....edu>
cc:	Jörn Engel <joern@...fs.org>,
	"H. Peter Anvin" <hpa@...or.com>,
	Linux Kernel Developers List <linux-kernel@...r.kernel.org>,
	Ralf Baechle <ralf@...ux-mips.org>, dave.taht@...il.com,
	blogic@...nwrt.org, andrewmcgr@...il.com, smueller@...onox.de,
	Geert Uytterhoeven <geert@...ux-m68k.org>, tg@...bsd.de
Subject: Re: [PATCH,RFC] random: collect cpu randomness

On Mon, 3 Feb 2014, Theodore Ts'o wrote:

> > How about taking the saved registers from the interrupted CPU, xor'ing
> > them all and calling the result random_get_entropy() on systems
> > lacking a good cycles-counter?
> 
> So we could take the struct pt_regs which we get from get_irq_regs(),
> XOR them together and use them to feed into input[2] amd input[3] in
> add_interrupt_randomness().  Or some other way of distributing the
> values of all of the irq registers into the __u32 input[4] array.

 Can we be sure we don't leak information this way?  Just being 
paranoid...

  Maciej
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