linux-kernel - Re: [PATCHv3 xfstests 2/3] generic: test openat and new O

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Message-ID: <20150318025238.GC10105@dastard>
Date:	Wed, 18 Mar 2015 13:52:38 +1100
From:	Dave Chinner <david@...morbit.com>
To:	Kees Cook <keescook@...omium.org>
Cc:	David Drysdale <drysdale@...gle.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Alexander Viro <viro@...iv.linux.org.uk>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Meredydd Luff <meredydd@...atehouse.org>,
	Will Drewry <wad@...omium.org>,
	Jorge Lucangeli Obes <jorgelo@...gle.com>,
	Ricky Zhou <rickyz@...gle.com>,
	Lee Campbell <leecam@...gle.com>,
	Julien Tinnes <jln@...gle.com>,
	Mike Depinet <mdepinet@...gle.com>,
	James Morris <james.l.morris@...cle.com>,
	Andy Lutomirski <luto@...capital.net>,
	Paolo Bonzini <pbonzini@...hat.com>,
	Paul Moore <paul@...l-moore.com>,
	Christoph Hellwig <hch@...radead.org>,
	Michael Kerrisk <mtk.manpages@...il.com>,
	Linux API <linux-api@...r.kernel.org>,
	linux-security-module <linux-security-module@...r.kernel.org>,
	fstests@...r.kernel.org
Subject: Re: [PATCHv3 xfstests 2/3] generic: test openat and new O_BENEATH
 flag

On Tue, Mar 17, 2015 at 08:33:27AM -0700, Kees Cook wrote:
> On Mon, Mar 16, 2015 at 4:24 PM, Dave Chinner
> <david@...morbit.com> wrote:
> > On Mon, Mar 09, 2015 at 02:00:11PM +0000, David Drysdale wrote:
> >> Test basic openat(2) behaviour.
> >>
> >> Test that if O_BENEATH flag is set, openat() will only open
> >> paths that have no .. component and do not start with /.
> >> Symlinks are also checked for the same restrictions.
> >>
> >> Signed-off-by: David Drysdale <drysdale@...gle.com> ---
> >> .gitignore            |   1 + common/openat         |  61
> >> ++++++++++++++++++++++++++++++ src/Makefile          |   3 +-
> >> src/openat.c          | 100
> >> +++++++++++++++++++++++++++++++++++++++++++++++++
> >
> > This strikes me as something that shoul dbe added to xfs_io for
> > testing, as it already supports a heap of other open flags and
> > xfstests is already dependent on it.
> 
> While I don't see a problem adding this to xfs_io, I'd still like
> to see this test live in the kernel tree too.

You can do whatever you want with the kernel tree - it doesn't
concern me at all.

> Having it in the
> same source means more testing, IMO.

That's complete bunk, though.  This helper binary is a limited use,
one shot test that can't be combined with anything else.  "sharing"
the source code across multiple different test suites doesn't change
that. However, putting support into xfs_io means it will get more
testing because we can *easily* use the functionality in many, many
different ways.

Cheers,

Dave.
-- 
Dave Chinner
david@...morbit.com
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