Update policy for Android 4.2 / latest master.
Primarily this consists of changes around the bluetooth subsystem.
The zygote also needs further permissions to set up /storage/emulated.
adbd service now gets a socket under /dev/socket.
keystore uses the binder.

Change-Id: I8c5aeb8d100313c75169734a0fa614aa974b3bfc
Signed-off-by: Stephen Smalley <sds@tycho.nsa.gov>

- allow all apps to connect to the keystore over unix socket
- dhcp runs scripts in /system/etc/dhcpcd/dhcpcd-hooks and creates/removes lease files
- mtp connects to dnsproxyd when a pptp vpn connection is established
- allow appdomain to also open qtaguid_proc and release_app to read qtaguid_device
- WifiWatchDog uses packet_socket when wifi comes up
- apps interact with isolated_apps when an app uses an isolated service and uses sockets for that interaction
- for apps with levelFromUid=true to interact with isolated_app, isolated_app must be an mlstrustedsubject

Change-Id: I09ff676267ab588ad4c73f04d8f23dba863c5949
Signed-off-by: Joshua Brindle <jbrindle@tresys.com>

The app_* syntax was a legacy of the original approach of looking up
the username returned by getpwuid() and the original username encoding
scheme by bionic.  With the recent changes to move away from this approach,
there is no reason to retain that syntax.  Instead, just use _app to match
app UIDs and _isolated to match isolated service UIDs.  The underscore
prefix is to signify that these are not real usernames and to avoid
conflicts with any system usernames.

Requires a corresponding change to libselinux.

Change-Id: Ic388a12c1c9d3e47386c8849db607140ef8a3d75
Signed-off-by: Stephen Smalley <sds@tycho.nsa.gov>

Used when an app service is declared with android:isolatedProcess="true".
Place such processes in a separate domain, and further isolate them
from each other via categories.

Change-Id: I1d64f8278f0619eedb448f9a741f1d2c31985325
Signed-off-by: Stephen Smalley <sds@tycho.nsa.gov>

Only enforce per-app process and file isolation via SELinux for third party apps, not platform apps.

Platform (any of the apps signed by build keys, i.e. platform|release|shared|media) apps expect to be able to share files with each other or with third party apps by passing open files or pathnames over Binder.  Therefore, we switch to only enforcing the per-app process and file isolation via SELinux on third party apps, not platform apps.

Make the platform app domains mlstrustedsubjects so that they can access any files created by third party apps.
Introduce a new platform_app_data_file type for platform apps so that we can mark it as a mlstrustedobject and allow third party apps to read/write files created by the platform apps.
Specify this new type for the platform app entries in seapp_contexts.
Remove levelFromUid=true for the platform apps in seapp_contexts since we are no longer enforcing per-app separation among them.