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From: David Drysdale <drysdale@google.com>
To: Paul Moore <paul@paul-moore.com>
Cc: Andy Lutomirski <luto@amacapital.net>,
	LSM List <linux-security-module@vger.kernel.org>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	Alexander Viro <viro@zeniv.linux.org.uk>,
	Meredydd Luff <meredydd@senatehouse.org>,
	Kees Cook <keescook@chromium.org>,
	James Morris <james.l.morris@oracle.com>,
	Linux API <linux-api@vger.kernel.org>
Subject: Re: [PATCH 09/11] capsicum: implementations of new LSM hooks
Date: Wed, 2 Jul 2014 18:09:27 +0100	[thread overview]
Message-ID: <CAHse=S_wZez=XOfGwkCCWXGMAFj3ivbL9g93RX66bOw3cYw1kQ@mail.gmail.com> (raw)
In-Reply-To: <1871630.hB3tXi0r3a@sifl>

On Wed, Jul 2, 2014 at 2:49 PM, Paul Moore <paul@paul-moore.com> wrote:
> On Monday, June 30, 2014 09:05:38 AM Andy Lutomirski wrote:
>> On Mon, Jun 30, 2014 at 3:28 AM, David Drysdale <drysdale@google.com> wrote:
>> > If the LSM does not provide implementations of the .file_lookup and
>> > .file_install LSM hooks, always use the Capsicum implementations.
>> >
>> > The Capsicum implementation of file_lookup checks for a Capsicum
>> > capability wrapper file and unwraps to if the appropriate rights
>> > are available.
>> >
>> > The Capsicum implementation of file_install checks whether the file
>> > has restricted rights associated with it.  If it does, it is replaced
>> > with a Capsicum capability wrapper file before installation into the
>> > fdtable.
>>
>> I think I fall on the "no LSM" side of the fence.  This kind of stuff
>> should be available regardless of selected LSM (as it is in your
>> code) ...
>
> I agree.  Looking quickly at the patches, the code seems to take an odd
> approach of living largely outside the LSM framework, but then relying on a
> couple of LSM hooks.  Capsicum should either live fully as a LSM or fully
> outside of it, this mix seems a bit silly to me.

Yeah, the end result was definitely a bit odd, hence the queries in the
cover email.  The consensus so far seems to be that they don't help,
so I'll remove the gratuitous LSM hooks on the next iteration.

Thanks,
David

> --
> paul moore
> www.paul-moore.com
>

  reply	other threads:[~2014-07-02 17:09 UTC|newest]

Thread overview: 53+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2014-06-30 10:28 [RFC PATCH 00/11] Adding FreeBSD's Capsicum security framework (part 1) David Drysdale
2014-06-30 10:28 ` [PATCH 01/11] fs: add O_BENEATH_ONLY flag to openat(2) David Drysdale
2014-06-30 14:49   ` Andy Lutomirski
2014-06-30 15:49     ` David Drysdale
2014-06-30 15:53       ` Andy Lutomirski
2014-07-08 12:07         ` Christoph Hellwig
2014-07-08 12:48           ` Meredydd Luff
2014-07-08 12:51             ` Christoph Hellwig
2014-07-08 13:04               ` Meredydd Luff
2014-07-08 13:12                 ` Christoph Hellwig
2014-06-30 20:40   ` Andi Kleen
2014-06-30 21:11     ` Andy Lutomirski
2014-07-01  9:53     ` David Drysdale
2014-07-01 18:58       ` Loganaden Velvindron
2014-07-08 12:03   ` Christoph Hellwig
2014-07-08 16:54     ` David Drysdale
2014-07-09  8:48       ` Christoph Hellwig
2014-06-30 10:28 ` [PATCH 02/11] selftests: Add test of O_BENEATH_ONLY & openat(2) David Drysdale
2014-06-30 10:28 ` [PATCH 03/11] capsicum: rights values and structure definitions David Drysdale
2014-06-30 10:28 ` [PATCH 04/11] capsicum: implement fgetr() and friends David Drysdale
2014-06-30 10:28 ` [PATCH 05/11] capsicum: convert callers to use fgetr() etc David Drysdale
2014-06-30 10:28 ` [PATCH 06/11] capsicum: implement sockfd_lookupr() David Drysdale
2014-06-30 10:28 ` [PATCH 07/11] capsicum: convert callers to use sockfd_lookupr() etc David Drysdale
2014-06-30 10:28 ` [PATCH 08/11] capsicum: add new LSM hooks on FD/file conversion David Drysdale
2014-06-30 10:28 ` [PATCH 09/11] capsicum: implementations of new LSM hooks David Drysdale
2014-06-30 16:05   ` Andy Lutomirski
2014-07-02 13:49     ` Paul Moore
2014-07-02 17:09       ` David Drysdale [this message]
2014-06-30 10:28 ` [PATCH 10/11] capsicum: invocation " David Drysdale
2014-06-30 10:28 ` [PATCH 11/11] capsicum: add syscalls to limit FD rights David Drysdale
2014-06-30 10:28 ` [PATCH 1/5] man-pages: open.2: describe O_BENEATH_ONLY flag David Drysdale
2014-06-30 22:22   ` Andy Lutomirski
2014-06-30 10:28 ` [PATCH 2/5] man-pages: capsicum.7: describe Capsicum capability framework David Drysdale
2014-06-30 10:28 ` [PATCH 3/5] man-pages: rights.7: Describe Capsicum primary rights David Drysdale
2014-06-30 10:28 ` [PATCH 4/5] man-pages: cap_rights_limit.2: limit FD rights for Capsicum David Drysdale
2014-06-30 14:53   ` Andy Lutomirski
2014-06-30 15:35     ` David Drysdale
2014-06-30 16:06       ` Andy Lutomirski
2014-06-30 16:32         ` David Drysdale
2014-06-30 10:28 ` [PATCH 5/5] man-pages: cap_rights_get: retrieve Capsicum fd rights David Drysdale
2014-06-30 22:28   ` Andy Lutomirski
2014-07-01  9:19     ` David Drysdale
2014-07-01 14:18       ` Andy Lutomirski
2014-07-03  9:12 ` [RFC PATCH 00/11] Adding FreeBSD's Capsicum security framework (part 1) Paolo Bonzini
2014-07-03 10:01   ` Loganaden Velvindron
2014-07-03 18:39   ` David Drysdale
2014-07-04  7:03     ` Paolo Bonzini
2014-07-07 10:29       ` David Drysdale
2014-07-07 12:20         ` Paolo Bonzini
2014-07-07 14:11           ` David Drysdale
2014-07-07 22:33           ` Alexei Starovoitov
2014-07-08 14:58             ` Kees Cook
2014-08-16 15:41             ` Pavel Machek

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