linux-kernel - Re: Is PIE randomization breaking klibc binaries?

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Message-Id: <20070721031809.54d573a9.akpm@linux-foundation.org>
Date:	Sat, 21 Jul 2007 03:18:09 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	"Bret Towe" <magnade@...il.com>
Cc:	"Ulrich Kunitz" <kune@...ne-taler.de>,
	linux-kernel@...r.kernel.org, Jan Kratochvil <honza@...os.cz>,
	Jiri Kosina <jkosina@...e.cz>,
	Roland McGrath <roland@...hat.com>,
	Jakub Jelinek <jakub@...hat.com>
Subject: Re: Is PIE randomization breaking klibc binaries?

On Fri, 20 Jul 2007 23:02:12 -0700 "Bret Towe" <magnade@...il.com> wrote:

> On 7/20/07, Ulrich Kunitz <kune@...ne-taler.de> wrote:
> > Since this week new linux-2.6/master kernels don't work with my
> > initial ram disks. The sleep binary runs repeatingly into
> > segmentation faults until the Busybox shell starts. My system is a
> > x86-64 with Kubuntu Feisty Fawn.
> >
> > By bisecting I found out that the PIE randomization patch (commit 60bfba7e)
> > appears to cause the segmentation faults.
> >
> > Digging further into the issue I found out, that the sleep binary
> > on the initial ramdisk is a klibc binary. /usr/bin/file says it is
> > statically linked and uses shared libraries. I have no clue about
> > klibc, but the binaries seem to be statically linked, but load a
> > shared library; probably at a fixed address. Other klibc binaries are also
> > running into segmentation faults. Busybox is working, but it is
> > statically linked and doesn't use a shared library.
> >
> > It looks like that the PIE randomization patch breaks klibc
> > binaries on x86-64.
> >
> > --
> > Uli Kunitz
> > -
> 
> oh bugger I just spent a few hours bisecting to find this headache
> only to find someone else had 8 hours ago... *sigh*
> 
> anyhow also seeing seg faults here on a amd64 ubuntu system
> reverting the PIE randomization patch made it go away

(cc's added)

I don't think we'll be fixing this in time for -rc1.  I'll revert
it.  Thanks for the prompt and accurate reporting.
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