full-disclosure - Re: a secure base system

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Message-ID: <20040315211641.GA29669@piper.madduck.net>
From: madduck at madduck.net (martin f krafft)
Subject: Re: a secure base system

also sprach Valdis.Kletnieks@...edu <Valdis.Kletnieks@...edu> [2004.03.15.2108 +0100]:
> > On typical Linux distributions noexec is pointless.
> > It does not prevent the execution of dynamically linked ELF images.
> > 
> > $ readelf -l /bin/bash | grep interpreter
> >       [Requesting program interpreter: /lib/ld-linux.so.2]
> > 
> > $ /lib/ld-linux.so.2 /bin/bash --version
> > GNU bash, version 2.05b.0(1)-release (i386-redhat-linux-gnu)
> > Copyright (C) 2002 Free Software Foundation, Inc.
> 
> This is fixed in the 2.6 kernel.

Wow, I didn't know this. Thanks for letting us know!

piper:~> uname -a
Linux piper 2.6.4-piper #1 Sun Mar 14 18:37:46 CET 2004 i686 GNU/Linux

piper:~> cp /bin/bash /tmp

piper:~> /lib/ld-linux.so.2 /tmp/bash --version
/tmp/bash: error while loading shared libraries: /tmp/bash: failed
to map segment from shared object: Operation not permitted

-- 
martin;              (greetings from the heart of the sun.)
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