Re: Hooking a system call.

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Subject: Re: Hooking a system call.
From: Ravishankar <cyberax82@xxxxxxxxx>
Date: Mon, 26 Mar 2012 21:00:07 +0530
Cc: kernelnewbies <kernelnewbies@xxxxxxxxxxxxxxxxx>
In-reply-to: <CA+CftcGKroq9U2CU6YwQGGFRhd6s99-AhpGmz9JTm+C=VkuhVw@mail.gmail.com>

>>how can I make system_call_table address to writable so that one can change to >>customized system call.

Like this:
      unsigned int level;
      pte_t *pte = lookup_address(sys_call_table, &level);
      if(pte->pte &~ _PAGE_RW) pte->pte |= _PAGE_RW;

An awesome example of pretty much what you're trying to do can be found here:
https://github.com/fpletz/kernelroll
Enjoy :D

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References:
- Hooking a system call.
  - From: V.Ravikumar
- Re: Hooking a system call.
  - From: Mulyadi Santosa
- Re: Hooking a system call.
  - From: V.Ravikumar

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