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Patching the system (cont.)
Recompile the kernel, especially if you are running RedHat. This is because RedHat has a history of not completely QCing their distribution. It has lead to issues in the past. Plus, you will get a smaller, faster, more efficient kernel.
There are a number of kernel patches available, including
LIDS, the Linux Intrusion Detection System
Openwall (not yet for 2.4 kernels yet)
International Crypto Kernel Patch
Notes: