Intercepting syscall

[shawnwebb]

I remember trying once on a FreeBSD 5.0-RELEASE box an LKM I wrote to 
intercept the open() call, yet it didn't work. The same code worked on a 
FreeBSD 4.7-RELEASE box. 

What I'm wondering is if FreeBSD 5.x has a readonly syscall table. Or maybe 
the ways of changing the syscall table has changed. 

Am I mistaken? 

In not too much importance, but relevant to my question, the reason why I'm 
asking, is I was presented to write an IPS (Intrusion Prevention System). 

Thanks for your help, 

Shawn Webb
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