core files
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 different security contexts be prevented from discovering that a process dumped core (when attacking a daemon it would be helpful to know when you made one of it's processes dump core).
The core file will have the same UID and GID as the process that crashed. It's impossible to maintain the complete security context of the crashing process in this manner as Unix permissions support multiple supplementary groups and Unix filesystems only support one GID. So the supplementary groups are lost.
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