linux-kernel - Re: [kernel-hardening] [PATCH v7 0/9] x86/mm: memory area address KASLR

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Message-ID: <20160622124707.GC9922@io.lakedaemon.net>
Date:	Wed, 22 Jun 2016 12:47:07 +0000
From:	Jason Cooper <jason@...edaemon.net>
To:	kernel-hardening@...ts.openwall.com
Cc:	Ingo Molnar <mingo@...nel.org>, Kees Cook <keescook@...omium.org>,
	Thomas Garnier <thgarnie@...gle.com>,
	Andy Lutomirski <luto@...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>, linux-kernel@...r.kernel.org,
	Jonathan Corbet <corbet@....net>, linux-doc@...r.kernel.org
Subject: Re: [kernel-hardening] [PATCH v7 0/9] x86/mm: memory area address
 KASLR

Hey Kees,

On Tue, Jun 21, 2016 at 05:46:57PM -0700, Kees Cook wrote:
> Notable problems that needed solving:
...
>  - Reasonable entropy is needed early at boot before get_random_bytes()
>    is available.

This series is targetting x86, which typically has RDRAND/RDSEED
instructions.  Are you referring to other arches?  Older x86?  Also,
isn't this the same requirement for base address KASLR?

Don't get me wrong, I want more diverse entropy sources available
earlier in the boot process as well. :-)  I'm just wondering what's
different about this series vs base address KASLR wrt early entropy
sources.

thx,

Jason.