linux-kernel - Re: brk randomization breaks columns

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Date:	Tue, 5 Feb 2008 17:09:13 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Pavel Machek <pavel@....cz>
Cc:	Jiri Kosina <jkosina@...e.cz>,
	kernel list <linux-kernel@...r.kernel.org>,
	Abel Bernabeu <abel.bernabeu@...il.com>,
	Hugh Dickins <hugh@...itas.com>,
	Arjan van de Ven <arjan@...radead.org>
Subject: Re: brk randomization breaks columns


* Pavel Machek <pavel@....cz> wrote:

> > From: Jiri Kosina <jkosina@...e.cz>
> > 
> > brk: check the lower bound properly
> > 
> > There is a check in sys_brk(), that tries to make sure that we do not 
> > underflow the area that is dedicated to brk heap.
> > 
> > The check is however wrong, as it assumes that brk area starts immediately 
> > after the end of the code (+bss), which is wrong for example in 
> > environments with randomized brk start. The proper way is to check whether 
> > the address is not below the start_brk address.
> > 
> > Signed-off-by: Jiri Kosina <jkosina@...e.cz>
> 
> ACK.

actually, does the patch above from Jiri solve the problem with your 11 
year old binaries too? (Sorry if it has been mentioned elsewhere, i 
could not decode it from this thread.)

	Ingo
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