Re: Intercepting system calls

[Jiri Kosina]

On Thu, 22 Dec 2011, Gaurav Saxena wrote:

> I am writing an application for which I need to intercept some
> filesystem system calls eg. unlink. I need unlink to call my code
> before deleting abc so that I could probably prevent unlink . I would
> like to implement this in a kernel module instead of modifying kernel
> code itself. I would like to intercept system calls by replacing
> system calls but I have not been able to find any method of doing that
> in linux > 3.0. Please suggest some method of doing that.

Write a kernel module that instruments sys_unlink() via krpobes. See 
Documentation/kprobes.txt for details.

-- 
Jiri Kosina
SUSE Labs

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