linux-kernel - Re: [PATCH v5 0/5] random,x86,kvm: Rework arch RNG seeds and get some from kvm

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Message-ID: <53EB1859.6030800@zytor.com>
Date:	Wed, 13 Aug 2014 00:48:41 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Andy Lutomirski <luto@...capital.net>,
	"Theodore Ts'o" <tytso@....edu>, kvm list <kvm@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Kees Cook <keescook@...omium.org>, X86 ML <x86@...nel.org>,
	Daniel Borkmann <dborkman@...hat.com>,
	Srivatsa Vaddagiri <vatsa@...ux.vnet.ibm.com>,
	Raghavendra K T <raghavendra.kt@...ux.vnet.ibm.com>,
	Gleb Natapov <gleb@...nel.org>,
	Paolo Bonzini <pbonzini@...hat.com>,
	Bandan Das <bsd@...hat.com>, Andrew Honig <ahonig@...gle.com>
Subject: Re: [PATCH v5 0/5] random,x86,kvm: Rework arch RNG seeds and get
 some from kvm

On 08/12/2014 12:22 PM, Andy Lutomirski wrote:
> On Tue, Aug 12, 2014 at 12:17 PM, Theodore Ts'o <tytso@....edu> wrote:
>> On Tue, Aug 12, 2014 at 12:11:29PM -0700, Andy Lutomirski wrote:
>>>
>>> What's the status of this series?  I assume that it's too late for at
>>> least patches 2-5 to make it into 3.17.
>>
>> Which tree were you hoping this patch series to go through?  I was
>> assuming it would go through the x86 tree since the bulk of the
>> changes in the x86 subsystem (hence my Acked-by).
> 
> There's some argument that patch 1 should go through the kvm tree.
> There's no real need for patch 1 and 2-5 to end up in the same kernel
> release, either.
> 
>>
>> IIRC, Peter had some concerns, and I don't remember if they were all
>> addressed.  Peter?
>>
> 
> I don't know.  I rewrite one thing he didn't like and undid the other,
> but there's plenty of opportunity for this version to be problematic, too.
> 

Sorry, I have been heads down on the current merge window.  I will look
at this for 3.18, presumably after Kernel Summit.

The proposed arch_get_rng_seed() is not really what it claims to be; it
most definitely does not produce seed-grade randomness, instead it seems
to be an arch function for best-effort initialization of the entropy
pools -- which is fine, it is just something quite different.

I want to look over it more carefully before acking it, though.

Andy, are you going to be in Chicago?

	-hpa

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