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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