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

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Message-ID: <CAGXu5jLfrGrVO=9sF6=TK0QQHq4SWRjL0urGu-e+e1H8gk9Y3Q@mail.gmail.com>
Date:	Tue, 17 Mar 2015 08:33:27 -0700
From:	Kees Cook <keescook@...omium.org>
To:	Dave Chinner <david@...morbit.com>
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 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. Having it in the same
source means more testing, IMO.

-Kees

-- 
Kees Cook
Chrome OS Security
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