Similar to SELinux, FreeBSD's Mandatory Access Control (MAC) framework provides a set of security policies. mac(4) describes the available policies; many of these, such as Biba and Lomac, are complex and require advanced knowledge to successfully implement. However, some policies are easy to implement and can increase the security of a system.
One such policy is mac_seeotheruids(4). On a default UNIX system, any user can see all running processes with ps -a or see who is logged into a system and which command he or she is currently executing with w. After implementing this policy, regular users will only be able to see their own processes and logins; however, the superuser will still be able to see all processes and logins.
The FreeBSD Handbook contains more information regarding MAC at http://www .freebsd.org/doc/en_US.ISO8859-1/books/handbook/mac.html.
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