linux-kernel - Re: Intercepting system calls

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Message-ID: <CAFLxGvxQ0E+j1LHfN3fCMM_TVqV6QG3B=VQiy1FPGdn5senBDw@mail.gmail.com>
Date:	Thu, 22 Dec 2011 18:05:30 +0100
From:	richard -rw- weinberger <richard.weinberger@...il.com>
To:	Gaurav Saxena <grvsaxena419@...il.com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: Intercepting system calls

On Thu, Dec 22, 2011 at 5:59 PM, Gaurav Saxena <grvsaxena419@...il.com> wrote:
> Hello Richard,
> Thank you very much for your reply.
>
> On Thu, Dec 22, 2011 at 10:12 PM, richard -rw- weinberger
> <richard.weinberger@...il.com> wrote:
>> On Thu, Dec 22, 2011 at 5:07 PM, Gaurav Saxena <grvsaxena419@...il.com> wrote:
>>> Hello all,
>>>
>>> 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.
>>>
>>
>> Intercepting system calls is very bad, don't do it.
> Oh. I will not do it then, could you suggest me something so that I
> could prevent unlink on some file say using kernel support. I want to
> save file on unlink how could I do that without kernel support, or how
> could I do that using a kernel module.
>>

It depends on your application.
Samba has vfs_recycle.
You can also write a fuse-filesystem.
Or use ptrace().

Select your pain. ;)

-- 
Thanks,
//richard
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