linux-kernel - Re: Intercepting system calls

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Message-ID: <CAOh0hwPbV5=QU=bB6Atw5taGW8CN9r8UesE=ZhKrO+sRDY0_3A@mail.gmail.com>
Date:	Fri, 23 Dec 2011 15:20:35 +0530
From:	Gaurav Saxena <grvsaxena419@...il.com>
To:	Jiri Kosina <jkosina@...e.cz>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: Intercepting system calls

Hello Jiri

On Fri, Dec 23, 2011 at 3:17 PM, Jiri Kosina <jkosina@...e.cz> wrote:
> 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.
Ok. I am looking at its details, will try that. But how could a probe
prevent execution of a system call?
>
> --
> Jiri Kosina
> SUSE Labs
>



-- 
Thanks and Regards ,
Gaurav
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