LOMAC is a security enhancement for Linux kernels. LOMAC demonstrates that it is possible to apply Mandatory Access Control techniques to standard Linux kernels already deployed in the field, and to do so in a manner that is simple, compatible, and largely invisible to the traditional Linux user. The LOMAC Loadable Kernel Module protects the integrity of critical system processes and files from viruses, worms, Trojan horses, and malicious remote users. It is compatible with standard Linux 2.2 kernels and applications, and seeks to provide useful protection without site-specific configuration. LOMAC is designed to be a form of MAC that typical users can live with.