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Date: Wed, 25 Sep 2013 10:08:01 +0200
From: Sebastian Krahmer <krahmer@...e.de>
To: oss-security@...ts.openwall.com
Subject: Re: Reproducible Builds for Fedora
Hi
cool stuff indeed and certainly a benefit.
On Tue, Sep 24, 2013 at 09:55:13PM +0530, Dhiru Kholia wrote:
> Hi,
>
> I have been working on having Reproducible Builds in Fedora for some
> time.
>
> At this point, I think I have something demoable. Ensuring Reproducible
> Builds is a big task and I want your feedback, ideas, code and support.
>
Since you asked for support, here's my idea. I hope I am not nitpicking, but
the whole idea behind reproducable builds is to avoid trojaned rpm's,
I guess.
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. The "grep -v"
will remove that, leaving a clean compare for injected code like
'call $base' etc. That would leave a wrong feeling about equal binaries.
regards,
Sebastian
--
~ perl self.pl
~ $_='print"\$_=\47$_\47;eval"';eval
~ krahmer@...e.de - SuSE Security Team
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