linux-kernel - Re: [RFC][Patch 5/5]integrity: IMA as an integrity service provider

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Date:	Thu, 29 May 2008 21:58:08 -0400
From:	Mimi Zohar <zohar@...ux.vnet.ibm.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	linux-kernel@...r.kernel.org, safford@...son.ibm.com,
	serue@...ux.vnet.ibm.com, sailer@...son.ibm.com, zohar@...ibm.com,
	sds@...ho.nsa.gov, casey@...aufler-ca.com
Subject: Re: [RFC][Patch 5/5]integrity: IMA as an integrity service provider


On Thu, 2008-05-29 at 16:35 -0700, Andrew Morton wrote: 
> On Thu, 29 May 2008 17:50:34 -0400
> Mimi Zohar <zohar@...ux.vnet.ibm.com> wrote:
> 
> > 
> > On Wed, 2008-05-28 at 20:30 -0700, Andrew Morton wrote:
> > 
> > > > ...
> > > >
> > > > > - All the games with mtimes should be described in the changelog too.
> > > > 
> > > > Ok. The timespec_recent and mtime issues are part of the same problem
> > > > of detecting when a file has been modified.
> > > 
> > > Can't use inode.i_version?
> > 
> > i_version is now working on my system.
> 
> Oh good.
> 
> >  It looks good. Is
> > there anything that I need to be concerned about, such as
> > limited filesystem support or the i_version is not updated 
> > by file_close for mmaped files?
> 
> erk, I'm not an i_version person.  It seems that it's only used on
> directories (to patch up readdir coherency problems) so I guess I
> misled you there.

No, no.  Initially, that's what I thought. I finally found
file_update_time() calls inode_inc_iversion(), which updates 
the i_version.  So, it does work.  The question is whether
or not it works all the time. :-)

> There's file_struct.f_version, which is no good.
> 
> i_generation is no good either.
> 
> We've documented these things so wonderfully!
> 
> i_writecount looks good?

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