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

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Date:	Tue, 26 Jul 2016 16:51:38 -0700
From:	Dave Hansen <dave.hansen@...el.com>
To:	Jason Cooper <jason@...edaemon.net>,
	"Roberts, William C" <william.c.roberts@...el.com>
Cc:	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"kernel-hardening@...ts.openwall.com" 
	<kernel-hardening@...ts.openwall.com>,
	"akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
	"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 07/26/2016 02:44 PM, Jason Cooper wrote:
>> > I'd likely need to take a small sample of programs and examine them,
>> > especially considering That as gaps are harder to find, it forces the
>> > randomization down and randomization can Be directly altered with
>> > length on mmap(), versus randomize_addr() which didn't have this
>> > restriction but OOM'd do to fragmented easier.
> Right, after the Android feedback from Nick, I think you have a lot of
> work on your hands.  Not just in design, but also in developing convincing
> arguments derived from real use cases.

Why not just have the feature be disabled on 32-bit by default?  All of
the Android problems seemed to originate with having a constrained
32-bit address space.