How to hook the system call?

[Geraint Yang]

Hello everyone,

I am going to hook a system call like 'read' or 'send' by modifying the
sys_call_table, but it seems that the sys_call_table is in read only page,
how can I set modify the sys_call_table ? Or if there any method that I can
use to hook a system call in module without modify the kernel source?

Thanks!

-- 
Geraint Yang
Tsinghua University Department of Computer Science and Technology
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