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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: [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.
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