I was leaning towards bug myself, thanks for clarifying. Patch uploaded:
https://android-review.googlesource.com/223300

From: Nick Kralevich [mailto:n...@google.com]
Sent: Friday, May 6, 2016 3:43 AM
To: Roberts, William C <william.c.robe...@intel.com>
Cc: seandroid-list@tycho.nsa.gov
Subject: Re: platform_app property_service:set

This seems like a bug in the policy. The intention of 
https://android-review.googlesource.com/194717 was to allow property setting 
access for platform_app.

Can you upload a change to fix this?

-- Nick

On Thu, May 5, 2016 at 8:37 AM, Roberts, William C 
<william.c.robe...@intel.com<mailto:william.c.robe...@intel.com>> wrote:
With platform app runing with a category set, it cannot access the 
property_socket since it is not mlstrustedobject. Which one of the following is 
this an example of:

1.       A bug in the policy

2.       Something you shouldn’t do

3.       Up to OEMs and if they want to add that typeattribute who cares… 
(property_set is restricted via neverallows on a few domains including 
untrusted_app).

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