linux-kernel - Re: devicetree random-seed properties, was: "Re: [PATCH v7 0/9] x86/mm: memory area address KASLR"

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Message-ID: <CALCETrX0bsFiykT=6d8K_igkBCDavdzxmq-A3VJ+7nht2s8FFg@mail.gmail.com>
Date:	Fri, 24 Jun 2016 13:40:41 -0700
From:	Andy Lutomirski <luto@...capital.net>
To:	Kees Cook <keescook@...omium.org>
Cc:	Jason Cooper <jason@...edaemon.net>,
	Ard Biesheuvel <ard.biesheuvel@...aro.org>,
	Thomas Garnier <thgarnie@...gle.com>,
	"kernel-hardening@...ts.openwall.com" 
	<kernel-hardening@...ts.openwall.com>,
	Ingo Molnar <mingo@...nel.org>,
	Andy Lutomirski <luto@...nel.org>,
	"x86@...nel.org" <x86@...nel.org>, Borislav Petkov <bp@...e.de>,
	Baoquan He <bhe@...hat.com>, Yinghai Lu <yinghai@...nel.org>,
	Juergen Gross <jgross@...e.com>,
	Matt Fleming <matt@...eblueprint.co.uk>,
	Toshi Kani <toshi.kani@....com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Dan Williams <dan.j.williams@...el.com>,
	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
	Dave Hansen <dave.hansen@...ux.intel.com>,
	Xiao Guangrong <guangrong.xiao@...ux.intel.com>,
	Martin Schwidefsky <schwidefsky@...ibm.com>,
	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>,
	Alexander Kuleshov <kuleshovmail@...il.com>,
	Alexander Popov <alpopov@...ecurity.com>,
	Dave Young <dyoung@...hat.com>, Joerg Roedel <jroedel@...e.de>,
	Lv Zheng <lv.zheng@...el.com>,
	Mark Salter <msalter@...hat.com>,
	Dmitry Vyukov <dvyukov@...gle.com>,
	Stephen Smalley <sds@...ho.nsa.gov>,
	Boris Ostrovsky <boris.ostrovsky@...cle.com>,
	Christian Borntraeger <borntraeger@...ibm.com>,
	Jan Beulich <JBeulich@...e.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Jonathan Corbet <corbet@....net>,
	"linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>
Subject: Re: devicetree random-seed properties, was: "Re: [PATCH v7 0/9]
 x86/mm: memory area address KASLR"

On Fri, Jun 24, 2016 at 12:04 PM, Kees Cook <keescook@...omium.org> wrote:
> On Fri, Jun 24, 2016 at 9:02 AM, Jason Cooper <jason@...edaemon.net> wrote:
>> Thomas,
>>
>> Sorry for wandering off the topic of your series.  The big take away for
>> me is that you and Kees are concerned about x86 systems pre-RDRAND.
>> Just as I'm concerned about deployed embedded systems without bootloader
>> support for hw-rngs and so forth.
>>
>> Whatever final form the approach takes for ARM/dt, I'll make sure we can
>> extend it to legacy x86 systems.
>
> Yeah, this seems like a productive conversation to me. :)

I have an old patch and spec I need to dust off that does this during
*very* early boot on x86 using MSRs so that kASLR can use it.