linux-kernel - Re: [kernel-hardening] [PATCH] [RFC] Introduce mmap randomization

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Date:	Thu, 04 Aug 2016 13:10:03 -0400
From:	Daniel Micay <danielmicay@...il.com>
To:	kernel-hardening@...ts.openwall.com,
	"jason@...edaemon.net" <jason@...edaemon.net>,
	"linux-mm@...r.kernel.org" <linux-mm@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"akpm@...ux-foundation.org" <akpm@...ux-foundation.org>
Cc:	"keescook@...omium.org" <keescook@...omium.org>,
	"gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
	"nnk@...gle.com" <nnk@...gle.com>,
	"jeffv@...gle.com" <jeffv@...gle.com>,
	"salyzyn@...roid.com" <salyzyn@...roid.com>,
	"dcashman@...roid.com" <dcashman@...roid.com>
Subject: Re: [kernel-hardening] [PATCH] [RFC] Introduce mmap randomization

On Thu, 2016-08-04 at 16:55 +0000, Roberts, William C wrote:
> > 
> > -----Original Message-----
> > From: Daniel Micay [mailto:danielmicay@...il.com]
> > Sent: Thursday, August 4, 2016 9:53 AM
> > To: kernel-hardening@...ts.openwall.com; jason@...edaemon.net;
> > linux-
> > mm@...r.kernel.org; linux-kernel@...r.kernel.org; akpm@...ux-
> > foundation.org
> > Cc: keescook@...omium.org; gregkh@...uxfoundation.org; nnk@...gle.co
> > m;
> > jeffv@...gle.com; salyzyn@...roid.com; dcashman@...roid.com
> > Subject: Re: [kernel-hardening] [PATCH] [RFC] Introduce mmap
> > randomization
> > 
> > On Tue, 2016-07-26 at 11:22 -0700, william.c.roberts@...el.com
> > wrote:
> > > 
> > > The recent get_random_long() change in get_random_range() and then
> > > the
> > > subsequent patches Jason put out, all stemmed from my tinkering
> > > with
> > > the concept of randomizing mmap.
> > > 
> > > Any feedback would be greatly appreciated, including any feedback
> > > indicating that I am idiot.
> > 
> > The RAND_THREADSTACK feature in grsecurity makes the gaps the way I
> > think
> > would be ideal, i.e. tracked as part of the appropriate VMA. It
> > would be
> > straightforward to make it more general purpose.
> 
> I am not familiar with that, thanks for pointing it out. I'll take a
> look when my time
> frees up for this again.

I'm actually wrong about that now that I look more closely...
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