From: Thomas Garnier <thgarnie@google.com>
To: Jason Cooper <jason@lakedaemon.net>
Cc: kernel-hardening@lists.openwall.com,
Ingo Molnar <mingo@kernel.org>, Kees Cook <keescook@chromium.org>,
Andy Lutomirski <luto@kernel.org>,
x86@kernel.org, Borislav Petkov <bp@suse.de>,
Baoquan He <bhe@redhat.com>, Yinghai Lu <yinghai@kernel.org>,
Juergen Gross <jgross@suse.com>,
Matt Fleming <matt@codeblueprint.co.uk>,
Toshi Kani <toshi.kani@hpe.com>,
Andrew Morton <akpm@linux-foundation.org>,
Dan Williams <dan.j.williams@intel.com>,
"Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>,
Dave Hansen <dave.hansen@linux.intel.com>,
Xiao Guangrong <guangrong.xiao@linux.intel.com>,
Martin Schwidefsky <schwidefsky@de.ibm.com>,
"Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com>,
Alexander Kuleshov <kuleshovmail@gmail.com>,
Alexander Popov <alpopov@ptsecurity.com>,
Dave Young <dyoung@redhat.com>, Joerg Roedel <jroedel@suse.de>,
Lv Zheng <lv.zheng@intel.com>, Mark Salter <msalter@redhat.com>,
Dmitry Vyukov <dvyukov@google.com>,
Stephen Smalley <sds@tycho.nsa.gov>,
Boris Ostrovsky <boris.ostrovsky@oracle.com>,
Christian Borntraeger <borntraeger@de.ibm.com>,
Jan Beulich <JBeulich@suse.com>,
LKML <linux-kernel@vger.kernel.org>,
Jonathan Corbet <corbet@lwn.net>,
linux-doc@vger.kernel.org
Subject: Re: [kernel-hardening] [PATCH v7 0/9] x86/mm: memory area address KASLR
Date: Wed, 22 Jun 2016 08:59:48 -0700 [thread overview]
Message-ID: <CAJcbSZHbGJBhTMeAEJF4VVazYypDCO=UFJpi8y0kXKrdM=WXQA@mail.gmail.com> (raw)
In-Reply-To: <20160622124707.GC9922@io.lakedaemon.net>
On Wed, Jun 22, 2016 at 5:47 AM, Jason Cooper <jason@lakedaemon.net> wrote:
> 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.
>
I think Kees was referring to the refactor I did to get the similar
entropy generation than KASLR module randomization. Our approach was
to provide best entropy possible even if you have an older processor
or under virtualization without support for these instructions.
Unfortunately common on companies with a large number of older
machines.
> thx,
>
> Jason.
Thanks,
Thomas
next prev parent reply other threads:[~2016-06-22 15:59 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-06-22 0:46 [kernel-hardening] [PATCH v7 0/9] x86/mm: memory area address KASLR Kees Cook
2016-06-22 0:46 ` [kernel-hardening] [PATCH v7 1/9] x86/mm: Refactor KASLR entropy functions Kees Cook
2016-06-22 0:46 ` [kernel-hardening] [PATCH v7 2/9] x86/mm: Update physical mapping variable names (x86_64) Kees Cook
2016-06-22 0:47 ` [kernel-hardening] [PATCH v7 3/9] x86/mm: PUD VA support for physical mapping (x86_64) Kees Cook
2016-06-22 0:47 ` [kernel-hardening] [PATCH v7 4/9] x86/mm: Separate variable for trampoline PGD (x86_64) Kees Cook
2016-06-22 0:47 ` [kernel-hardening] [PATCH v7 5/9] x86/mm: Implement ASLR for kernel memory regions (x86_64) Kees Cook
2016-06-22 0:47 ` [kernel-hardening] [PATCH v7 6/9] x86/mm: Enable KASLR for physical mapping memory region (x86_64) Kees Cook
2016-06-22 0:47 ` [kernel-hardening] [PATCH v7 7/9] x86/mm: Enable KASLR for vmalloc " Kees Cook
2016-06-22 0:47 ` [kernel-hardening] [PATCH v7 8/9] x86/mm: Enable KASLR for vmemmap " Kees Cook
2016-06-22 0:47 ` [kernel-hardening] [PATCH v7 9/9] x86/mm: Memory hotplug support for KASLR memory randomization (x86_64) Kees Cook
2016-06-22 12:47 ` [kernel-hardening] [PATCH v7 0/9] x86/mm: memory area address KASLR Jason Cooper
2016-06-22 15:59 ` Thomas Garnier [this message]
2016-06-22 17:05 ` Kees Cook
2016-06-23 19:33 ` Jason Cooper
2016-06-23 19:45 ` Sandy Harris
2016-06-23 19:59 ` Kees Cook
2016-06-23 20:19 ` Jason Cooper
2016-06-23 20:16 ` Jason Cooper
2016-06-23 19:58 ` Kees Cook
2016-06-23 20:05 ` Ard Biesheuvel
2016-06-24 1:11 ` Jason Cooper
2016-06-24 10:54 ` Ard Biesheuvel
2016-06-24 16:02 ` [kernel-hardening] devicetree random-seed properties, was: "Re: [PATCH v7 0/9] x86/mm: memory area address KASLR" Jason Cooper
2016-06-24 19:04 ` [kernel-hardening] " Kees Cook
2016-06-24 20:40 ` Andy Lutomirski
2016-06-30 21:48 ` Jason Cooper
2016-06-30 21:56 ` Thomas Garnier
2016-06-30 21:48 ` Jason Cooper
2016-07-07 22:24 ` [kernel-hardening] Re: [PATCH v7 0/9] x86/mm: memory area address KASLR Kees Cook
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