linux-kernel - Re: [RFC][PATCH v1 0/2] integrity: module integrity verification

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Date:	Wed, 08 Feb 2012 08:45:09 -0500
From:	Mimi Zohar <zohar@...ux.vnet.ibm.com>
To:	Rusty Russell <rusty@...abs.org>
Cc:	"Kasatkin, Dmitry" <dmitry.kasatkin@...el.com>,
	James Morris <jmorris@...ei.org>,
	linux-security-module@...r.kernel.org,
	linux-kernel@...r.kernel.org, David Howells <dhowells@...hat.com>,
	Lucas De Marchi <lucas.demarchi@...fusion.mobi>,
	Jon Masters <jcm@...hat.com>
Subject: Re: [RFC][PATCH v1 0/2] integrity: module integrity verification

On Wed, 2012-02-08 at 10:09 +1030, Rusty Russell wrote:
> On Tue, 7 Feb 2012 23:18:38 +0200, "Kasatkin, Dmitry" <dmitry.kasatkin@...el.com> wrote:
> > On Tue, Feb 7, 2012 at 7:13 PM, Rusty Russell <rusty@...abs.org> wrote:
> > > On Mon, 6 Feb 2012 08:59:00 +0200, "Kasatkin, Dmitry" <dmitry.kasatkin@...el.com> wrote:
> > >> On Mon, Feb 6, 2012 at 3:51 AM, James Morris <jmorris@...ei.org> wrote:
> > >> > On Wed, 1 Feb 2012, Dmitry Kasatkin wrote:
> > >> >
> > >> >> Hi,
> > >> >>
> > >> >> Here is another module verification patchset, which is based on the recently
> > >> >> upstreamed digital signature support used by EVM and IMA-appraisal.
> > >> >
> > >> > You should cc: Rusty on any changes to the module code.
> > >> >
> > >>
> > >> Hello,
> > >>
> > >> Mimi already has pointed that out.
> > >> I have sent him an email with the link..
> > >
> > > Thanks.
> > >
> > > Using an external signature (via cmdline arguments) is simple, at
> > > least.  Not sure what the userspace side of this looks like?
> > >
> > 
> > Hello,
> > 
> > There are couple of patches for modprobe and insmod...
> > 
> > You could see them on the top at:
> > http://linux-ima.git.sourceforge.net/git/gitweb.cgi?p=linux-ima/module-init-tools.git;a=summary
> > 
> > It first tries to read signature from xattr, then from file...
> > "modprobe -v" will show 'ima='  parameter with signature.
> > 
> > - Dmitry
> 
> The problem is that distributions tend to have two variants of modules:
> stripped and unstripped.  Thus you may want to support multiple
> signatures, any *one* of which may match.
> 
> I've cc'd the module-init-tools and libkmod maintainers for their
> comments, too.
> 
> Cheers,
> Rusty.

Hi Rusty,

As a distro knows what it is shipping, why would you need support for
both stripped/unstripped versions.  Unless "stripping" occurs post
install.  Perhaps something similar to 'prelink'?

thanks,

Mimi

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