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Debian is participating in the Google Summer Of Code (or Winter if you are in the southern hemisphere). It would be good if we could get a SE Linux related project in. If you are interested in doing some SE Linux work (or other security related work) in this regard then please let me know. […] The book SE Linux by Example has been reviewed on Slashdot. The issue of Perl scripts was raised for discussion. It is of course true that a domain which is permitted to run the Perl interpreter can perform arbitrary system calls – it can therefore do anything that SE Linux permits that domain to do. […] Creating a simple SE Linux policy module is not difficult. audit(1173571340.836:12855): avc: denied { execute } for pid=5678 comm=”spf-policy.pl” name=”hostname” dev=hda ino=1234 scontext=root:system_r:postfix_master_t:s0 tcontext=system_u:object_r:hostname_exec_t:s0 tclass=file For example I had a server with the above messages in the kernel message log from the spf-policy program (run from Postfix) trying to run the “hostnme” program. So I […] Ulrich Drepper has written a good web page about text relocation which is most often noticed as execmod failures reported when running SE Linux. When an AVC message reports a failure of execmod against a shared object it means that the object has text relocations (the shared object code writes to code that it executes […] One of the most obvious (and yet most common) computer security mistakes is to take input from an untrusted (and potentially hostile) source. A classic example of this is in Windows Vista where audio output from the system speakers can be taken as input to the speech recognition system. According to the BBC article an […] A post by Scott James Remnant describes how to hide command-line options from PS output. It’s handy to know that but that post made one significant implication that I strongly disagree with. It said about command-line parameters “perhaps they contain sensitive information“. If the parameters contain sensitive information then merely hiding them after the fact […] The issue of core file management has come up for discussion again in the SE Linux list. I believe that there are two essential security requirements for managing core files, one is that the complete security context of the crashing process is stored (to the greatest possible extent), and the other is that processes with […] While reading the discussion of Vista security on Bruce Schneier’s blog it occurred to me that comparing the issues of DRM that face MS with the issues faced by SE Linux developers provides some benefits. SE Linux is designed to enable the owner of a computer to effectively enforce security policies to protect their system […] Chris Samual writes a good summary of Peter Gutmann’s analysis of the cost of Vista (in terms of DRM). The following paragraph in the article however seemed more interesting to me: Once a weakness is found in a particular driver or device, that driver will have its signature revoked by Microsoft, which means that it […] A few days ago I installed Debian/Etch on my Thinkpad. One of the reasons for converting from Fedora to Debian is that I need to run Xen and Fedora doesn’t support non-PAE machines with Xen. Ironically it’s hardware supplied to me by Red Hat (Thinkpad T41p) that is lacks PAE support and forces me to […] |
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