linux-kernel - Re: [rfc 3/3] prctl: Add PR_SET_MM codes to tune up mm

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Message-ID: <20111129205547.GJ1775@moon>
Date:	Wed, 30 Nov 2011 00:55:47 +0400
From:	Cyrill Gorcunov <gorcunov@...il.com>
To:	Serge Hallyn <serge.hallyn@...onical.com>
Cc:	Kees Cook <keescook@...omium.org>, linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Tejun Heo <tj@...nel.org>, Andrew Vagin <avagin@...nvz.org>,
	Pavel Emelyanov <xemul@...allels.com>,
	Vasiliy Kulikov <segoon@...nwall.com>
Subject: Re: [rfc 3/3] prctl: Add PR_SET_MM codes to tune up mm_struct entires

On Tue, Nov 29, 2011 at 02:49:11PM -0600, Serge Hallyn wrote:
> 
> My memory is a bit hazy here, but cryo
> (http://git.sr71.net/?p=cryo-forhallyn.git;a=summary) did also do
> this from userspace.  As I recall the one problem we had was ...
> that we couldn't lower the mm_start of the first segment?  I think.
> But I bring it up only because the advantage of doing it this way
> was that all of the ptrace protections automatically applied.
> 

Thanks for the link Serge, I'll take a look. I think for start_code
we might stick for exactly Elf path -- ie it should be vma with
at least "r-xp" prototipe as mapped by elf path (and restrictions
from Kees's mail should be applied on it as well). Other members
are not that clear for me.
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