On 03/08/2011 02:05 PM, Mike Frysinger wrote: > On Tue, Mar 8, 2011 at 1:40 PM, Alex Efros wrote: >> On Fri, Mar 06, 2009 at 03:25:16PM -0800, Ned Ludd wrote: >>>> On Fri, Mar 06, 2009 at 11:12:59PM +0200, [email protected] 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. > > like they said, this doesnt seem to be a bug in the kernel, so the pax > source arent going to be changing > > if there's a bug in glibc, an actual bug in bugs.g.o needs to be > opened with real details/patches. otherwise, nothing is going to > change. > -mike
Nothing to say that Mike hasn't already said. pipacs knows about this but what can he do? Good luck with upstream glibc. Next time I speak with pipacs I can bring it up, see if anything is changing. I doubt it. Take a look at [1] for a good laugh. Ref: [1] http://sourceware.org/bugzilla/show_bug.cgi?id=12492 -- Anthony G. Basile, Ph.D. Gentoo Developer
