Re: [gentoo-hardened] 2.6.27-hardened-r8: assassination

[Alex Efros <powerman@powerman.name>]

Hi!

On Fri, Mar 06, 2009 at 03:25:16PM -0800, Ned Ludd wrote:
> > On Fri, Mar 06, 2009 at 11:12:59PM +0200, pageexec@freemail.hu wrote:
> > > ah crap, i know what it is. it's a several years old glibc bug where someone
> > > put a certain variable into the RELRO segment but forgot that it'll be written
> > > to later when a library with RWE GNU_STACK is loaded. the workaround is
> > > to find that library (just extract them from strace, probably it'll be
> > > pari's library) and run execstack -c on it.
> > 
> > I don't have execstack command. Looks like it belong to prelink package,
> > but http://www.gentoo.org/doc/en/prelink-howto.xml states it's
> > incompatible with hardened. Because of this I decide to compile it
> > manually, just to get execstack command:
> > 
> > # emerge -f prelink
> > # cd /usr/src
> > # tar xjvf /usr/portage-distfiles/prelink-20071009.tar.bz2
> > # cd prelink
> > # ./configure && make
> > 
> > Now I tried your workaround:
> > 
> > # /usr/src/prelink/src/execstack -c /usr/lib/perl5/site_perl/5.8.8/i686-linux/auto/Math/Pari/Pari.so
> > # /usr/src/prelink/src/execstack -c /usr/local/ioncube/ioncube_loader_lin_5.2.so
> > # /usr/src/prelink/src/execstack -c /usr/local/Zend/lib/ZendExtensionManager.so
> > # /usr/src/prelink/src/execstack -c /usr/local/Zend/lib/ZendExtensionManager_TS.so
> > # /usr/src/prelink/src/execstack -c /usr/local/Zend/lib/Optimizer-3.3.0/php-5.2.x/ZendOptimizer.so
> > 
> > and it works!!
> > 
> > Is this issue will be fixed in next stable hardened-sources?
> 
> FYI.. PaX Team maintains the PaX kernel and has little control over what
> fixes go into the "next" hardened-sources. Also seems to me a little
> strange that the PaX Team would have to put a work-around in the kernel
> for a bug in glibc.. Seems like glibc should be fixed vs the kernel.

2 years later… Just updated system, bug still exists, and I still have to
use execstack workaround for zendoptimizer and ioncube.

-- 
			WBR, Alex.