ServiceManager: Allow system services running as secondary users to add services

This should be reverted when all system services have been cleaned up to not
do this. A process looking up a service while running in the background will
see the service registered by the active user (assuming the service is
registered on every user switch), not the service registered by the user that
the process itself belongs to.

BUG: 30795333
Change-Id: I1b74d58be38ed358f43c163692f9e704f8f31dbe
(cherry picked from commit e6bbe69ba739c8a08837134437aaccfea5f1d943)
diff --git a/cmds/servicemanager/Android.mk b/cmds/servicemanager/Android.mk
index 73c0367..b214f19 100644
--- a/cmds/servicemanager/Android.mk
+++ b/cmds/servicemanager/Android.mk
@@ -18,7 +18,7 @@
 include $(BUILD_EXECUTABLE)
 
 include $(CLEAR_VARS)
-LOCAL_SHARED_LIBRARIES := liblog libselinux
+LOCAL_SHARED_LIBRARIES := liblog libcutils libselinux
 LOCAL_SRC_FILES := service_manager.c binder.c
 LOCAL_CFLAGS += $(svc_c_flags)
 LOCAL_MODULE := servicemanager
diff --git a/cmds/servicemanager/service_manager.c b/cmds/servicemanager/service_manager.c
index 8a8e688..68e3ceb 100644
--- a/cmds/servicemanager/service_manager.c
+++ b/cmds/servicemanager/service_manager.c
@@ -8,6 +8,8 @@
 #include <stdlib.h>
 #include <string.h>
 
+#include <cutils/multiuser.h>
+
 #include <private/android_filesystem_config.h>
 
 #include <selinux/android.h>
@@ -122,7 +124,7 @@
 {
     const char *perm = "add";
 
-    if (uid >= AID_APP) {
+    if (multiuser_get_app_id(uid) >= AID_APP) {
         return 0; /* Don't allow apps to register services */
     }