On Sat, 2009-03-07 at 00:57 +0200, Alex Efros wrote: > Hi! > > 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. -- Ned Ludd <[email protected]> Gentoo Linux
