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Date: Tue, 5 Feb 2008 23:04:31 +0100 From: Pavel Machek <pavel@....cz> To: Ingo Molnar <mingo@...e.hu> 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 On Tue 2008-02-05 17:09:13, Ingo Molnar wrote: > > * 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.) No, it should just make the problem more obvious... -- (english) http://www.livejournal.com/~pavelmachek (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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