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Message-ID: <2836108.mUalApn0j6@x2>
Date: Wed, 25 Sep 2013 09:59:59 -0400
From: Steve Grubb <sgrubb@...hat.com>
To: oss-security@...ts.openwall.com
Cc: Sebastian Krahmer <krahmer@...e.de>
Subject: Re: Reproducible Builds for Fedora
Hello,
On Wednesday, September 25, 2013 10:08:01 AM Sebastian Krahmer wrote:
> I was checking the rpm-compare how it actually is doing the compre
> and you have:
>
> [...]
> base=`basename $f`
> objdump -d rpm1/$f | grep -v $base > dump1
> objdump -d rpm2/$f | grep -v $base > dump2
> diff -u dump1 dump2 > /dev/null
> if [ $? -ne 0 ] ; then
> echo "File disassembly differs $f"
> cnt=`expr $cnt + 1`
> fi
> [...]
>
> for ELF files and doing a sha256sum for other file types. My concern is
> that attackers could construct a package that contains function-names that
> match the basename of the binary that you are checking.
Thanks for the feedback. I think the 'grep -v' can be replaced with sed
'1,2d'. Its purpose was to delete the file path that objdump inserts at the top
which causes miscompares.
-Steve
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