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Message-ID: <1470330603.22643.120.camel@gmail.com>
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: [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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