linux-kernel - Re: Intercepting system calls

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Message-ID: <CAOh0hwNrOHVOx6eFf6EM8MmGwjeCP4-PfCHtMPnBQm4th91Q8Q@mail.gmail.com>
Date:	Fri, 23 Dec 2011 17:29:10 +0530
From:	Gaurav Saxena <grvsaxena419@...il.com>
To:	Jiri Kosina <jkosina@...e.cz>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: Intercepting system calls

I found that Ubuntu does not have a kprobe enabled kernel. :( I don't
think I could use kprobes then.

On Fri, Dec 23, 2011 at 3:20 PM, Gaurav Saxena <grvsaxena419@...il.com> wrote:
> 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



-- 
Thanks and Regards ,
Gaurav
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