On Tue, Mar 8, 2011 at 3:49 PM, Anthony G. Basile wrote: > 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. > > 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.
if there is a real bug in glibc that drepper is ignoring, that doesnt mean we cant merge it into Gentoo's glibc. hence open a bug in bugs.g.o with the patch for me to review. -mike
