linux-kernel - Re: brk randomization breaks columns

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Message-ID: <20080205085841.51713a5d@laptopd505.fenrus.org>
Date:	Tue, 5 Feb 2008 08:58:41 -0800
From:	Arjan van de Ven <arjan@...radead.org>
To:	Pavel Machek <pavel@....cz>
Cc:	Hugh Dickins <hugh@...itas.com>, Jiri Kosina <jkosina@...e.cz>,
	kernel list <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...e.hu>,
	Abel Bernabeu <abel.bernabeu@...il.com>
Subject: Re: brk randomization breaks columns

On Tue, 5 Feb 2008 16:46:48 +0100
Pavel Machek <pavel@....cz> wrote:

> Hi!
> 
> > > In my usual dither, I'm rather hoping Arjan will have a clear
> > > answer.
> > 
> > 
> > setarch works. If the apps come in source form they need fixing
> > anyway (since I'd not be surprised of current gcc reorders
> > variables), if not.. we only have 2 cases, the other case was the
> > build process of emacs (which got fixed 5 years ago).
> 
> uemacs ... broken with randomization
> colums, sss ... local programs, broken with randomization
> procinfo ... broken, randomization makes it die sooner.
> mikmod ... broken with randomization
> bsdsed ... broken with randomization
> ...
> Should I test few more?

ok throw that idea out of the window then

the combo of a config option + sysctl sounds the right way forward then ;(

Unless there's a way we can make sys_brk() detect this kind of behavior somehow...
we could track per process if brk(0) was called, and if not, do something fancy to work around stuff?



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