title: Linux kernel modules - security risk?
body: <p>How much of a security risk are linux kernel modules? I remember reading that it was possible if someone got access, that all they had to do was load a rootkit module. Is this correct? Is there any way to protect against this?</p>
  
  <p>What parts of the kernel are actually exposed through the module interface, and what functions do programmers have access to, that could be used for malicous purposes?</p>