Phantasmagoria hides tasks without modifying syscalls in Linux kernel v2.4. Includes a paper "Smashing The Kernel For Fun And Profit" and proof of concept code.
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Cerberus is an experimental tool kernel based for hardening systems. The main idea in local is that, except particular cases, a process can't have better privileges than his father. If Cerberus intercepts anomalies it kills the process before it starts to run. Cerberus stops remote exploits by ensuring that processes like in.telnetd or tcpd will never drop a shell.
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