linux-kernel - Re: [PATCH 2/3] integrity: Linux Integrity Module(LIM)

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Date:	Fri, 31 Oct 2008 09:51:42 -0700
From:	Dave Hansen <dave@...ux.vnet.ibm.com>
To:	Christoph Hellwig <hch@...radead.org>
Cc:	Mimi Zohar <zohar@...ux.vnet.ibm.com>,
	linux-kernel@...r.kernel.org, James Morris <jmorris@...ei.org>,
	David Safford <safford@...son.ibm.com>,
	Serge Hallyn <serue@...ux.vnet.ibm.com>,
	Mimi Zohar <zohar@...ibm.com>
Subject: Re: [PATCH 2/3] integrity: Linux Integrity Module(LIM)

On Tue, 2008-10-14 at 09:28 -0400, Christoph Hellwig wrote:
> > --- a/include/linux/fs.h
> > +++ b/include/linux/fs.h
> > @@ -683,6 +683,9 @@ struct inode {
> >  #ifdef CONFIG_SECURITY
> >       void                    *i_security;
> >  #endif
> > +#ifdef CONFIG_INTEGRITY
> > +     void                    *i_integrity;
> > +#endif
> 
> Sorry, but as said before bloating the inode for this is not an option.
> Please use something like the MRU approach I suggested in the last
> review round.

Why don't we just have a 'void *i_lots_of_bloat field', and let the
security folks stick whatever they want in it?  They can trade their
i_security space for a new one.  I know we want to conceptually separate
security from integrity, so let's separate it:

struct i_bloat_inodes {
#ifdef CONFIG_SECURITY
	void                    *i_security;
#endif
#ifdef CONFIG_INTEGRITY
	void                    *i_integrity;
#endif
};

By the way, if there's no TPM hardware, why would I want i_integrity
anyway?

-- Dave

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