Date: Tue, 5 Feb 2008 17:06:20 +0100
From: Ingo Molnar <mingo@elte.hu>
To: Pavel Machek <pavel@ucw.cz>
Cc: Arjan van de Ven <arjan@infradead.org>, Hugh Dickins <hugh@veritas.com>,
       Jiri Kosina <jkosina@suse.cz>,
       kernel list <linux-kernel@vger.kernel.org>,
       Abel Bernabeu <abel.bernabeu@gmail.com>
Subject: Re: brk randomization breaks columns
Message-ID: <20080205160620.GA28812@elte.hu>
References: <20080204122837.GA1647@elf.ucw.cz> <Pine.LNX.4.64.0802050242440.30873@twin.jikos.cz> <Pine.LNX.4.64.0802051243240.542@blonde.site> <20080205070001.7bc8058f@laptopd505.fenrus.org> <20080205154648.GA24331@elf.ucw.cz> <20080205154953.GA26829@elte.hu> <20080205155959.GC24331@elf.ucw.cz>
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* Pavel Machek <pavel@ucw.cz> wrote:

> . Yes, setarch i386 -R /usr/local/bin/uemacs (etc) fixes them, too.
> 	
> What about this?
> 
> Heap randomization breaks /lib/libc.so.5.4.33, make it possible to 
> randomize normal stuff but leave the heap alone.

certainly looks fine to me, but please also add a .config to make it 
default to 2. The reason is that a good portions of the overflows happen 
on the heap and 99.9% of the Linux users do not run 1996-era glibc 
anymore.

something like CONFIG_COMPAT_BRK=y, which would cause randomize_va_space 
to default to 1, and if a user or distro disables it, it will default to 
2.

	Ingo
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