1 files changed, 29 insertions, 0 deletions
diff --git a/service/java/com/android/server/wifi/util/WifiPermissionsUtil.java b/service/java/com/android/server/wifi/util/WifiPermissionsUtil.java
index 63197ea6d..ebe7ea481 100644
--- a/service/java/com/android/server/wifi/util/WifiPermissionsUtil.java
+++ b/service/java/com/android/server/wifi/util/WifiPermissionsUtil.java
@@ -30,6 +30,7 @@ import android.os.Build;
 import android.os.UserHandle;
 import android.os.UserManager;
 import android.provider.Settings;
+import android.util.EventLog;
 import android.util.Log;
 
 import com.android.internal.annotations.GuardedBy;
@@ -589,4 +590,32 @@ public class WifiPermissionsUtil {
         if (devicePolicyManager == null) return false;
         return devicePolicyManager.isProfileOwnerApp(packageName);
     }
+
+    /**
+     * Check if the given UID belongs to the current foreground user. This is
+     * used to prevent apps running in background users from modifying network
+     * configurations.
+     * <p>
+     * UIDs belonging to system internals (such as SystemUI) are always allowed,
+     * since they always run as {@link UserHandle#USER_SYSTEM}.
+     *
+     * @param uid uid of the app.
+     * @return true if the given UID belongs to the current foreground user,
+     *         otherwise false.
+     */
+    public boolean doesUidBelongToCurrentUser(int uid) {
+        if (uid == android.os.Process.SYSTEM_UID
+                // UIDs with the NETWORK_SETTINGS permission are always allowed since they are
+                // acting on behalf of the user.
+                || checkNetworkSettingsPermission(uid)) {
+            return true;
+        }
+        boolean isCurrentProfile = isCurrentProfile(uid);
+        if (!isCurrentProfile) {
+            // Fix for b/174749461
+            EventLog.writeEvent(0x534e4554, "174749461", -1,
+                    "Non foreground user trying to modify wifi configuration");
+        }
+        return isCurrentProfile;
+    }
 }