On Tue, Jun 26, 2007 at 07:47:00PM -0700, Andrew Morton wrote:
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> On Tue, 26 Jun 2007 19:24:03 -0700 John Johansen <jjohansen@suse.de> wrot=
e:
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> > >=20
> > > so...  where do we stand with this?  Fundamental, irreconcilable
> > > differences over the use of pathname-based security?
> > >=20
> > There certainly seems to be some differences of opinion over the use
> > of pathname-based-security.
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> I was refreshed to have not been cc'ed on a lkml thread for once.  I guess
> it couldn't last.
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sorry about that

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> Do you agree with the "irreconcilable" part?  I think I do.
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I will concede that this may be the case for some.  However I am still
hopeful (perhaps naive) that this isn't the case in general.

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> I suspect that we're at the stage of having to decide between
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> a) set aside the technical issues and grudgingly merge this stuff as a
>    service to Suse and to their users (both of which entities are very
>    important to us) and leave it all as an object lesson in
>    how-not-to-develop-kernel-features.
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>    Minimisation of the impact on the rest of the kernel is of course
>    very important here.
Agreed, and I hope any changes that are made are for the benefit
of the kernel in general and will find uses in other parts.

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> versus
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> b) leave it out and require that Suse wear the permanent cost and
>    quality impact of maintaining it out-of-tree.  It will still be an
>    object lesson in how-not-to-develop-kernel-features.
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> Sigh.  Please don't put us in this position again.  Get stuff upstream
> before shipping it to customers, OK?  It ain't rocket science.
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Indeed, I can only appologize for the past, and offer reassurances
that we intend to do our best to do, it right going forward.

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> > > Are there any other sticking points?
> > >=20
> > >=20
> > The conditional passing of the vfsmnt mount in the vfs, as done in this
> > patch series, has received a NAK.  This problem results from NFS passing
> > a NULL nameidata into the vfs.  We have a second patch series that we
> > have posted for discussion that addresses this by splitting the nameida=
ta
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> > struct.
> > Message-Id: <20070626231510.883881222@suse.de>
> > Subject: [RFD 0/4] AppArmor - Don't pass NULL nameidata to
> > vfs_create/lookup/permission IOPs
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> > other issues that have been raised are:
> > - AppArmor does not currently mediate IPC and network communications.
> >   Mediation of these is a wip
> > - the use of d_path to generate the pathname used for mediation when a
> >   file is opened.
> >   - Generating the pathname using a reverse walk is considered ugly
> >   - A buffer is alloced to store the generated path name.
> >   - The  buffer size has a configurable upper limit which will cause
> >     opens to fail if the pathname length exceeds this limit.  This
> >     is a fail closed behavior.
> >   - there have been some concerns expressed about the performance
> >     of this approach
> >   We are evaluating our options on how best to address this issue.
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> OK, useful summary, thanks.  I'd encourage you to proceed apace.

thankyou