Date: Wed, 25 Sep 2013 16:13:47 +0200 From: Nicolas Vigier <boklm@...s-attacks.org> To: oss-security@...ts.openwall.com Subject: Re: Reproducible Builds for Fedora On Wed, 25 Sep 2013, Steve Grubb wrote: > 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. Or something like this ? (cd rpm1; objdump -d $f > ../dump1) (cd rpm2; objdump -d $f > ../dump2)
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