Gentoo Archives: gentoo-hardened

From: Ned Ludd <solar@g.o>
To: gentoo-hardened@l.g.o
Subject: Re: [gentoo-hardened] 2.6.27-hardened-r8: assassination
Date: Fri, 06 Mar 2009 23:25:19
Message-Id: 1236381916.8071.25.camel@hangover
In Reply to: Re: [gentoo-hardened] 2.6.27-hardened-r8: assassination by Alex Efros
1 On Sat, 2009-03-07 at 00:57 +0200, Alex Efros wrote:
2 > Hi!
3 >
4 > On Fri, Mar 06, 2009 at 11:12:59PM +0200, pageexec@××××××××.hu wrote:
5 > > ah crap, i know what it is. it's a several years old glibc bug where someone
6 > > put a certain variable into the RELRO segment but forgot that it'll be written
7 > > to later when a library with RWE GNU_STACK is loaded. the workaround is
8 > > to find that library (just extract them from strace, probably it'll be
9 > > pari's library) and run execstack -c on it.
10 >
11 > I don't have execstack command. Looks like it belong to prelink package,
12 > but http://www.gentoo.org/doc/en/prelink-howto.xml states it's
13 > incompatible with hardened. Because of this I decide to compile it
14 > manually, just to get execstack command:
15 >
16 > # emerge -f prelink
17 > # cd /usr/src
18 > # tar xjvf /usr/portage-distfiles/prelink-20071009.tar.bz2
19 > # cd prelink
20 > # ./configure && make
21 >
22 > Now I tried your workaround:
23 >
24 > # /usr/src/prelink/src/execstack -c /usr/lib/perl5/site_perl/5.8.8/i686-linux/auto/Math/Pari/Pari.so
25 > # /usr/src/prelink/src/execstack -c /usr/local/ioncube/ioncube_loader_lin_5.2.so
26 > # /usr/src/prelink/src/execstack -c /usr/local/Zend/lib/ZendExtensionManager.so
27 > # /usr/src/prelink/src/execstack -c /usr/local/Zend/lib/ZendExtensionManager_TS.so
28 > # /usr/src/prelink/src/execstack -c /usr/local/Zend/lib/Optimizer-3.3.0/php-5.2.x/ZendOptimizer.so
29 >
30 > and it works!!
31 >
32 > Is this issue will be fixed in next stable hardened-sources?
33
34 FYI.. PaX Team maintains the PaX kernel and has little control over what
35 fixes go into the "next" hardened-sources. Also seems to me a little
36 strange that the PaX Team would have to put a work-around in the kernel
37 for a bug in glibc.. Seems like glibc should be fixed vs the kernel.
38
39
40
41 --
42 Ned Ludd <solar@g.o>
43 Gentoo Linux

Replies

Subject Author
Re: [gentoo-hardened] 2.6.27-hardened-r8: assassination Alex Efros <powerman@××××××××××××××××××.com>
Re: [gentoo-hardened] 2.6.27-hardened-r8: assassination Alex Efros <powerman@××××××××.name>