Anyway to split apps sharing an UID?

Question

For a while, I had an exclamation mark instead of a signal status in the top bar, and some apps didn't realize they were connected to Internet when other worked perfectly.
Thanks to AFWall+ logs, I found the issue.
I need to allow access to an app called com.android.engineeringmode.



But this app is tied (in OnePlus 3) with some others, as you can see in this screenshot :
screenshot taken in AFWall+



I'm OK to allow access to EngineerMode, but certainly not to all this bunch of apps (especially camera or fingerprints services).



After searching the web, I found that all theses apps are linked in /data/system/packages.xml using the sharedUid 1000. But it is said to never change the UID of an app when it's shared (I didn't really get why).



I'm using the stock ROM (OxygenOS 3.2.8) from OP3, but rooted (got Xposed an Xprivacy too), so it's Android 6.0.1.



Is there any chance I can allow Network access to EngineerMode only ?


— Stopi | Sources

Answer

While iBug's comment seems a better answer to the question, my real need was to have a correct Internet access detection over the system.



In order to fix my issue I had to open an adb shell, type in 



settings put global captive_portal_detection_enabled 0


Then reboot. The exclamation mark went away and problematic apps behave better now.



For the record, this prevent a check on Google's servers. This check was impossible with my firewall's rules.



Thanks to Dan Hulme and iBug for their help.


— Stopi | Sources

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