Resolve conflicting values of usesCleartextTraffic for shared processes

Bug: 148240416
Test: Manually tested by installing two apps running in a shared process
and starting their shared process activities in various orders. The
value of usesCleartextTraffic gets set as expected.
Change-Id: Ib350c09c42d5524734fb259a2ab787790f2d8e30

core/java/android/app/LoadedApk.java

@@ -46,6 +46,7 @@ import android.os.StrictMode;
 import android.os.SystemProperties;
 import android.os.Trace;
 import android.os.UserHandle;
+import android.security.net.config.NetworkSecurityConfigProvider;
 import android.sysprop.VndkProperties;
 import android.text.TextUtils;
 import android.util.AndroidRuntimeException;
@@ -1202,6 +1203,9 @@ public final class LoadedApk {
             }
 
             ContextImpl appContext = ContextImpl.createAppContext(mActivityThread, this);
+            // The network security config needs to be aware of multiple
+            // applications in the same process to handle discrepancies
+            NetworkSecurityConfigProvider.handleNewApplication(appContext);
             app = mActivityThread.mInstrumentation.newApplication(
                     cl, appClass, appContext);
             appContext.setOuterContext(app);

core/java/android/security/net/config/NetworkSecurityConfigProvider.java

@@ -17,11 +17,14 @@
 package android.security.net.config;
 
 import android.content.Context;
-import java.security.Security;
+import android.util.Log;
+
 import java.security.Provider;
+import java.security.Security;
 
 /** @hide */
 public final class NetworkSecurityConfigProvider extends Provider {
+    private static final String LOG_TAG = "nsconfig";
     private static final String PREFIX =
             NetworkSecurityConfigProvider.class.getPackage().getName() + ".";
 
@@ -42,4 +45,30 @@ public final class NetworkSecurityConfigProvider extends Provider {
         }
         libcore.net.NetworkSecurityPolicy.setInstance(new ConfigNetworkSecurityPolicy(config));
     }
+
+    /**
+     * For a shared process, resolves conflicting values of usesCleartextTraffic.
+     * 1. Throws a RuntimeException if the shared process with conflicting
+     * usesCleartextTraffic values have per domain rules.
+     * 2. Sets the default instance to the least strict config.
+     */
+    public static void handleNewApplication(Context context) {
+        ApplicationConfig config = new ApplicationConfig(new ManifestConfigSource(context));
+        ApplicationConfig defaultConfig = ApplicationConfig.getDefaultInstance();
+        String mProcessName = context.getApplicationInfo().processName;
+        if (defaultConfig != null) {
+            if (defaultConfig.isCleartextTrafficPermitted()
+                    != config.isCleartextTrafficPermitted()) {
+                Log.w(LOG_TAG, mProcessName
+                        + ": New config does not match the previously set config.");
+
+                if (defaultConfig.hasPerDomainConfigs()
+                        || config.hasPerDomainConfigs()) {
+                    throw new RuntimeException("Found multiple conflicting per-domain rules");
+                }
+                config = defaultConfig.isCleartextTrafficPermitted() ? defaultConfig : config;
+            }
+        }
+        ApplicationConfig.setDefaultInstance(config);
+    }
 }