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

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Message-ID: <dda83e780707202302g177d09acg94e77f724e97f17a@mail.gmail.com>
Date:	Fri, 20 Jul 2007 23:02:12 -0700
From:	"Bret Towe" <magnade@...il.com>
To:	"Ulrich Kunitz" <kune@...ne-taler.de>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: Is PIE randomization breaking klibc binaries?

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
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