Adding users for OEM native cod

by Dan Hein » Tue, 01 Sep 2009 14:41:35 GMT

Sponsored Links
 What if I want to add another oemuser, similar to "radio" such that I
can support neato_oem_widgit or neato_oem_daemon?  How do I do this in
Android such that I can better architect areas of code that need
privileged execution from those that do not, e.g. such as in the

I am currently running neato_oem_daemon as root.  I want to reduce its
privilege level to "oemuser", to better sandbox it, restrict the files
it can read/write, and give it it's own system properties,  etc.
However, reading the the current warnings about changing the AID list
in private/android_filesystem_config.h make it seem that adding such a
user is not possible.

What is the best way to do this (use setuid, restrict files for
oem_daemon, impart system properties to oem_daemon) in the bowls of
Android without messing up more widespread platform assumptions about
user IDs?


Adding users for OEM native cod

by JoelV » Wed, 02 Sep 2009 17:23:08 GMT

 Good question Dan, I had a similar one that I posted to the porting
forum a while back, see 

Sponsored Links

Adding users for OEM native cod

by Dianne Hackborn » Wed, 02 Sep 2009 19:07:07 GMT

 The only uids android uses as far as I know are those defined in the
filesystem header, and everything from 10000 and above for dynamically
assigning to applications.


Adding users for OEM native cod

by Dan Hein » Wed, 02 Sep 2009 20:32:17 GMT

 Thanks Dianne.

I think what Joel and I are really asking is whether or not we can
submit a patch to files such as


where we define a AID range for OEM use.  As Joel suggested, 9000-9100.

I think Joel and I want to follow best practices by running
'oem_widget' with least privilege and with proper confinement.


If this suggestion goes anywhere, we'd probably want to make the range
even larger, just to be forward-looking.

Many thanks,


Adding users for OEM native cod

by Dianne Hackborn » Wed, 02 Sep 2009 21:24:52 GMT

 That would be fine with me.


Adding users for OEM native cod

by JoelV » Thu, 03 Sep 2009 18:16:48 GMT

 Thanks Dianne, Dan. I'm fine with broadening the OEM ID range that we
allocate, although I suspect that we won't have too many cases for a
device/device family where we'd need more than 100.



Adding users for OEM native cod

by Dianne Hackborn » Thu, 03 Sep 2009 21:28:14 GMT

 Yeah 100 is quite a lot. :)  We probably don't even have half that number
used by the full platform, even counting all of the dynamic IDs assigned to
each of the built-in .apks. ;)

Dianne Hackborn
Android framework engineer

Note: please don't send private questions to me, as I don't have time to
provide private support, and so won't reply to such e-mails.  All such
questions should be posted on public forums, where I and others can see and
answer them.

Adding users for OEM native cod

by Dan Hein » Fri, 04 Sep 2009 03:42:46 GMT

 The attached patches show what I'm thinking.


Other Threads

1. Non OTA upgrades

How would people using phones like the Samsung I7500 without a
standard carrier like T-Mobile (say Airtel in India) get the next
Android upgrades? Don't think OTA is an option there...

If there isn't a manual upgrade option, that entire market is severely



2. How to Add New Building in Android Google Map

            I wanted add a new building in android Google map. Does
any one know how to Edit Android Google map and add new building.(i
don't want to use push pin). Please help any one to solve this.

Thank you ,


3. How to collect unhandled exception message in the app?

4. Whats the purpos of recovery.img??

5. A Layout question

6. Create ProgressBar programmatically

7. OpenCore 1.0 vs. 2.0