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From: Valdis.Kletnieks@vt.edu
To: "H. Peter Anvin" <hpa@zytor.com>
Cc: Cyrill Gorcunov <gorcunov@openvz.org>,
	Andrew Morton <akpm@linux-foundation.org>,
	Oleg Nesterov <oleg@redhat.com>,
	"Eric W. Biederman" <ebiederm@xmission.com>,
	Pavel Emelyanov <xemul@parallels.com>,
	Andrey Vagin <avagin@openvz.org>,
	KOSAKI Motohiro <kosaki.motohiro@gmail.com>,
	Ingo Molnar <mingo@elte.hu>, Thomas Gleixner <tglx@linutronix.de>,
	Glauber Costa <glommer@parallels.com>,
	Andi Kleen <andi@firstfloor.org>, Tejun Heo <tj@kernel.org>,
	Matt Helsley <matthltc@us.ibm.com>,
	Pekka Enberg <penberg@kernel.org>,
	Eric Dumazet <eric.dumazet@gmail.com>,
	Vasiliy Kulikov <segoon@openwall.com>,
	Alexey Dobriyan <adobriyan@gmail.com>,
	Michal Marek <mmarek@suse.cz>,
	Frederic Weisbecker <fweisbec@gmail.com>,
	linux-kernel@vger.kernel.org, Jonathan Corbet <corbet@lwn.net>
Subject: Re: + syscalls-x86-add-__nr_kcmp-syscall-v8.patch added to -mm tree
Date: Tue, 10 Apr 2012 20:02:21 -0400	[thread overview]
Message-ID: <8169.1334102541@turing-police.cc.vt.edu> (raw)
In-Reply-To: Your message of "Mon, 09 Apr 2012 16:22:38 -0700." <4F836F3E.9090207@zytor.com>

[-- Attachment #1: Type: text/plain, Size: 1009 bytes --]

On Mon, 09 Apr 2012 16:22:38 -0700, "H. Peter Anvin" said:
> On 04/09/2012 03:24 PM, Cyrill Gorcunov wrote:
> >>
> >> Having re-read most of the (enormous) email discussion on the kcmp()
> >> syscall patch, I'm thinking:
> >>
> >> - Nobody seems to understand the obfuscation logic.  Jon sounded
> >>   confused, Oleg sounds confused and it's rather unclear what it does,
> >>   how it does it and why it does it.
> >
> > The obfuscation logic was done with great help from hpa@. And the main
> > idea was to have ordered results after obfuscation. Per-type noise increase
> > randomization of results. So Andrew, I actually dont know what to add
> > here. We don't want to provide kernel order back to user-space in
> > naked manner.
> >
>
> The obfuscation logic is to provide a 1:1 mapping but which doesn't
> preserve ordering, thereby avoid leaking information of kernel pointers
> to user space.

Oh, OK... Ignore my previous note then.  But we should lose the comment
that implies we have an ordering?

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  parent reply	other threads:[~2012-04-11  0:04 UTC|newest]

Thread overview: 49+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2012-02-15 14:36 + syscalls-x86-add-__nr_kcmp-syscall-v8.patch added to -mm tree Oleg Nesterov
2012-02-15 15:10 ` Cyrill Gorcunov
2012-02-15 15:38   ` Oleg Nesterov
2012-02-15 16:13     ` Cyrill Gorcunov
2012-02-15 16:22       ` Oleg Nesterov
2012-02-15 17:53         ` Cyrill Gorcunov
2012-02-15 18:43           ` Oleg Nesterov
2012-02-15 19:56             ` Cyrill Gorcunov
2012-02-15 19:57               ` Vasiliy Kulikov
2012-02-15 20:05                 ` Cyrill Gorcunov
2012-02-15 20:25                   ` Cyrill Gorcunov
2012-02-15 21:09                     ` Cyrill Gorcunov
2012-02-15 21:58                       ` Cyrill Gorcunov
2012-02-16 14:49                         ` Oleg Nesterov
2012-02-16 15:13                           ` Cyrill Gorcunov
2012-02-16 16:49                             ` Cyrill Gorcunov
2012-02-16 17:40                               ` Oleg Nesterov
2012-02-16 17:58                                 ` Cyrill Gorcunov
2012-02-16 19:03                                   ` Oleg Nesterov
2012-02-16 19:20                                     ` H. Peter Anvin
2012-02-16 19:29                                     ` Cyrill Gorcunov
2012-02-16 19:52                                       ` Andrew Morton
2012-02-16 20:01                                         ` Cyrill Gorcunov
2012-02-16 18:21                               ` Vasiliy Kulikov
2012-02-16 18:34                                 ` Cyrill Gorcunov
2012-02-16 18:33                                   ` Vasiliy Kulikov
2012-02-16 18:49                                 ` Oleg Nesterov
2012-02-15 18:32   ` Cyrill Gorcunov
2012-02-15 19:06     ` Oleg Nesterov
2012-02-15 19:18       ` Cyrill Gorcunov
2012-02-15 16:06 ` Oleg Nesterov
2012-02-15 16:27   ` Cyrill Gorcunov
2012-04-09 22:10     ` Andrew Morton
2012-04-09 22:24       ` Cyrill Gorcunov
2012-04-09 23:22         ` H. Peter Anvin
2012-04-10 22:37           ` Cyrill Gorcunov
2012-04-10 22:39             ` H. Peter Anvin
2012-04-10 22:48               ` Cyrill Gorcunov
2012-04-10 23:08             ` Oleg Nesterov
2012-04-10 23:32               ` H. Peter Anvin
2012-04-10 23:42                 ` Oleg Nesterov
2012-04-11  6:39                   ` Cyrill Gorcunov
2012-04-11 18:31                     ` Oleg Nesterov
2012-04-11  0:02           ` Valdis.Kletnieks [this message]
2012-04-10  3:25       ` Eric W. Biederman
2012-04-10 22:54         ` Cyrill Gorcunov
2012-04-10 23:58       ` Valdis.Kletnieks
2012-04-11  0:06         ` H. Peter Anvin
  -- strict thread matches above, loose matches on Subject: below --
2012-02-14 23:15 akpm

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