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Message-ID: <476DC76E7D1DF2438D32BFADF679FC560127DD18@ORSMSX103.amr.corp.intel.com>
Date: Thu, 4 Aug 2016 16:55:19 +0000
From: "Roberts, William C" <william.c.roberts@...el.com>
To: "kernel-hardening@...ts.openwall.com"
<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
> -----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.com;
> 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.
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