From: Daniel De Graaf <dgdegra@tycho.nsa.gov>
To: Doug Goldstein <cardoe@cardoe.com>, xen-devel@lists.xen.org
Subject: Re: [PATCH 10/17] flask: remove xen_flask_userlist operation
Date: Mon, 20 Jun 2016 11:07:05 -0400 [thread overview]
Message-ID: <345fecfb-d112-d8df-aed5-142f3ca4b14a@tycho.nsa.gov> (raw)
In-Reply-To: <a71bab90-d0b1-4d86-b802-8de6019caa3f@cardoe.com>
On 06/20/2016 10:35 AM, Doug Goldstein wrote:
> On 6/20/16 9:04 AM, Daniel De Graaf wrote:
>> This operation has no known users, and is primarily useful when an MLS
>> policy is in use (which has never been shipped with Xen). In addition,
>> the information it provides does not actually depend on hypervisor
>> state (only on the XSM policy), so an application that needs it could
>> compute the results without needing to involve the hypervisor.
>>
>
> So if I read this language correctly. Removing this does not affect
> someone being able to build a MLS policy at a later date right?
Correct; that support is still there. This hypercall was used to
compute a list of reachable security contexts for a given user, which
is trivial in a non-MLS policy but more complex when one is being
used. This computation makes more sense on Linux (where creating
new contexts via "exec" is common) than on Xen (where normally a
domain cannot create another).
--
Daniel De Graaf
National Security Agency
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next prev parent reply other threads:[~2016-06-20 15:07 UTC|newest]
Thread overview: 58+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-06-20 14:04 [PATCH v2 00/17] XSM/FLASK updates for 4.8 Daniel De Graaf
2016-06-20 14:04 ` [PATCH 01/17] flask/policy: split into modules Daniel De Graaf
2016-06-20 14:04 ` [PATCH 02/17] flask/policy: split out rules for system_r Daniel De Graaf
2016-06-20 14:04 ` [PATCH 03/17] flask/policy: move user definitions and constraints into modules Daniel De Graaf
2016-06-20 14:04 ` [PATCH 04/17] flask/policy: remove unused support for binary modules Daniel De Graaf
2016-06-20 14:04 ` [PATCH 05/17] flask/policy: xenstore stubdom policy Daniel De Graaf
2016-06-20 14:04 ` [PATCH 06/17] flask/policy: remove unused example Daniel De Graaf
2016-06-20 14:04 ` [PATCH 07/17] flask: unify {get, set}vcpucontext permissions Daniel De Graaf
2016-06-20 14:27 ` Doug Goldstein
2016-06-20 14:35 ` Andrew Cooper
2016-06-20 14:50 ` Daniel De Graaf
2016-06-20 14:58 ` Andrew Cooper
2016-06-20 14:04 ` [PATCH 08/17] flask: remove unused secondary context in ocontext Daniel De Graaf
2016-06-20 14:30 ` Doug Goldstein
2016-06-20 14:04 ` [PATCH 09/17] flask: remove unused AVC callback functions Daniel De Graaf
2016-06-20 14:32 ` Doug Goldstein
2016-06-20 14:04 ` [PATCH 10/17] flask: remove xen_flask_userlist operation Daniel De Graaf
2016-06-20 14:19 ` Jan Beulich
2016-06-20 14:35 ` Doug Goldstein
2016-06-20 15:07 ` Daniel De Graaf [this message]
2016-06-20 15:16 ` Doug Goldstein
2016-06-20 14:04 ` [PATCH 11/17] flask: improve unknown permission handling Daniel De Graaf
2016-06-20 14:37 ` Doug Goldstein
2016-06-20 14:04 ` [PATCH 12/17] xen/xsm: remove .xsm_initcall.init section Daniel De Graaf
2016-06-20 14:38 ` Doug Goldstein
2016-06-21 15:21 ` Andrew Cooper
2016-06-21 15:41 ` Julien Grall
2016-06-21 16:03 ` Andrew Cooper
2016-06-20 14:04 ` [PATCH 13/17] xen: move FLASK entry under XSM in Kconfig Daniel De Graaf
2016-06-20 14:41 ` Doug Goldstein
2016-06-20 14:42 ` Doug Goldstein
2016-06-20 14:46 ` Doug Goldstein
2016-06-20 15:11 ` Daniel De Graaf
2016-06-20 15:28 ` Jan Beulich
2016-06-20 16:49 ` Doug Goldstein
2016-06-21 17:09 ` [PATCH 13/17 v3] " Daniel De Graaf
2016-06-24 14:43 ` Doug Goldstein
2016-06-20 14:04 ` [PATCH 14/17] xsm: annotate setup functions with __init Daniel De Graaf
2016-06-20 14:46 ` Doug Goldstein
2016-06-20 14:04 ` [PATCH 15/17] xsm: clean up unregistration Daniel De Graaf
2016-06-20 14:47 ` Doug Goldstein
2016-06-20 14:04 ` [PATCH 16/17] xen: Make FLASK_AVC_STATS kconfig option visible Daniel De Graaf
2016-06-20 14:49 ` Doug Goldstein
2016-06-20 14:04 ` [PATCH 17/17] xsm: add a default policy to .init.data Daniel De Graaf
2016-06-20 14:52 ` Doug Goldstein
2016-06-24 16:30 ` Julien Grall
2016-06-24 16:50 ` Konrad Rzeszutek Wilk
2016-06-24 17:34 ` Daniel De Graaf
2016-06-24 17:40 ` Konrad Rzeszutek Wilk
2016-06-24 17:42 ` Daniel De Graaf
2016-06-24 17:46 ` Konrad Rzeszutek Wilk
2016-06-24 18:02 ` Daniel De Graaf
2016-06-24 18:36 ` Konrad Rzeszutek Wilk
2016-06-24 17:41 ` Konrad Rzeszutek Wilk
2016-06-24 17:47 ` Julien Grall
2016-06-24 17:44 ` Julien Grall
2016-06-21 15:24 ` [PATCH v2 00/17] XSM/FLASK updates for 4.8 Andrew Cooper
2016-06-27 9:48 ` Andrew Cooper
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