Add new configuration loading path for apex module Cronet

Add an additional loading path which is used for libs permission
xml providing from Cronet apex module.

Bug: 145474221
Bug: 139397529
Test: build
Test: manual test with Cronet
Change-Id: I103539a45fe9182f84a79bfe45a6172d94068690
Merged-In: I02541eb2d4808d69ab8cb2d6a48cf8aaa39c86dc

core/java/com/android/server/SystemConfig.java

@@ -24,6 +24,7 @@ import android.content.pm.FeatureInfo;
 import android.content.pm.PackageManager;
 import android.os.Build;
 import android.os.Environment;
+import android.os.FileUtils;
 import android.os.Process;
 import android.os.SystemProperties;
 import android.os.storage.StorageManager;
@@ -417,6 +418,19 @@ public class SystemConfig {
                 Environment.getSystemExtDirectory(), "etc", "sysconfig"), ALLOW_ALL);
         readPermissions(Environment.buildPath(
                 Environment.getSystemExtDirectory(), "etc", "permissions"), ALLOW_ALL);
+
+        // Skip loading configuration from apex if it is not a system process.
+        if (!isSystemProcess()) {
+            return;
+        }
+        // Read configuration of libs from apex module.
+        // TODO(146407631): Use a solid way to filter apex module folders?
+        for (File f: FileUtils.listFilesOrEmpty(Environment.getApexDirectory())) {
+            if (f.isFile() || f.getPath().contains("@")) {
+                continue;
+            }
+            readPermissions(Environment.buildPath(f, "etc", "permissions"), ALLOW_LIBS);
+        }
     }
 
     void readPermissions(File libraryDir, int permissionFlag) {