linux-kernel - Re: security module question

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Date:	Thu, 06 Aug 2009 14:38:08 -0400
From:	Eric Paris <eparis@...hat.com>
To:	James Morris <jmorris@...ei.org>
Cc:	Justin Banks <justinb@...bone.com>, linux-kernel@...r.kernel.org,
	linux-security-module@...r.kernel.org
Subject: Re: security module question

On Wed, 2009-08-05 at 12:02 +1000, James Morris wrote:
> On Tue, 4 Aug 2009, Justin Banks wrote:
> 
> > Hello - I'm trying to implement a security module that will allow or
> > disallow writes on files by byte ranges. Is there a way to use
> > inode_permission() to do this, or is there an alternative route I should
> > take? It doesn't look like inode_permission() will give me the data I
> > need (offset + length of write).

There is nothing that can do that.  Neither fanotify nor the LSM.
Biggest problem is mmap.....

I think there was past kernel module which did this, but I don't
remember what they were called.  Nothing which tracks this and could be
used was ever reasonable for the mainline kernel.

-Eric

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