linux-kernel - Re: Intercepting system calls

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Message-ID: <alpine.LRH.2.00.1112231044360.21599@twin.jikos.cz>
Date:	Fri, 23 Dec 2011 10:45:16 +0100 (CET)
From:	Jiri Kosina <jkosina@...e.cz>
To:	Wakko Warner <wakko@...mx.eu.org>
Cc:	Gaurav Saxena <grvsaxena419@...il.com>,
	linux-kernel@...r.kernel.org
Subject: Re: Intercepting system calls

On Thu, 22 Dec 2011, Wakko Warner wrote:

> > 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.
> 
> I wrote a library that can be loaded in userspace that does this.  It's not
> very polished, but it works for me.  I use it for rsync when I want files
> "deleted" but not from the filesystem.  It creates a .deleted directory in
> the $PWD.

I don't see a way how library could cover any arbitrary userspace process 
issuing unlink() (consider statically linked binaries, for starters).

-- 
Jiri Kosina
SUSE Labs

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