linux-kernel - Re: brk randomization breaks columns

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Message-ID: <20080205160620.GA28812@elte.hu>
Date:	Tue, 5 Feb 2008 17:06:20 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Pavel Machek <pavel@....cz>
Cc:	Arjan van de Ven <arjan@...radead.org>,
	Hugh Dickins <hugh@...itas.com>, Jiri Kosina <jkosina@...e.cz>,
	kernel list <linux-kernel@...r.kernel.org>,
	Abel Bernabeu <abel.bernabeu@...il.com>
Subject: Re: brk randomization breaks columns


* Pavel Machek <pavel@....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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