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

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Date:	Thu, 04 Aug 2016 12:53:09 -0400
From:	Daniel Micay <danielmicay@...il.com>
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.
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