oss-sec mailing list archives
Re: Reproducible Builds for Fedora
From: Sebastian Krahmer <krahmer () suse de>
Date: Wed, 25 Sep 2013 10:08:01 +0200
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 () suse de - SuSE Security Team
Current thread:
- Reproducible Builds for Fedora Dhiru Kholia (Sep 24)
- Re: Reproducible Builds for Fedora Sebastian Krahmer (Sep 25)
- Re: Reproducible Builds for Fedora Steve Grubb (Sep 25)
- Re: Reproducible Builds for Fedora Nicolas Vigier (Sep 25)
- Re: Reproducible Builds for Fedora Sebastian Krahmer (Sep 25)
- Re: Reproducible Builds for Fedora Solar Designer (Sep 25)
- Re: Reproducible Builds for Fedora Alexander Cherepanov (Sep 26)
- Re: Reproducible Builds for Fedora Steve Grubb (Sep 26)
- Re: Reproducible Builds for Fedora Alexander Cherepanov (Sep 26)
- Re: Reproducible Builds for Fedora Paul Pluzhnikov (Sep 26)
- Re: Reproducible Builds for Fedora Kurt Seifried (Sep 26)
- Re: Reproducible Builds for Fedora Paul Pluzhnikov (Sep 27)
- Re: Reproducible Builds for Fedora Steve Grubb (Sep 25)
- Re: Reproducible Builds for Fedora Sebastian Krahmer (Sep 25)