Properly set SELinux context after reboot

After reboot, the SELinux context labels for files located in `/data/adb` are reset to `u:object_r:adb_data_file:s0`.

To fully address the issue in ed1f61d, we should always compare the SELinux context and reset it when necessary.

Author: JingMatrix

daemon/src/main/java/org/lsposed/lspd/service/ConfigFileManager.java

@@ -70,6 +70,7 @@
 import java.util.HashSet;
 import java.util.List;
 import java.util.Locale;
+import java.util.stream.Stream;
 import java.util.zip.Deflater;
 import java.util.zip.ZipEntry;
 import java.util.zip.ZipFile;
@@ -454,20 +455,38 @@ static void ensureModuleFilePath(String path) throws RemoteException {
 
     static Path resolveModuleDir(String packageName, String dir, int userId, int uid) throws IOException {
         var path = modulePath.resolve(String.valueOf(userId)).resolve(packageName).resolve(dir).normalize();
-        if (uid != -1) {
-            if (path.toFile().mkdirs()) {
-                try {
-                    SELinux.setFileContext(path.toString(), "u:object_r:xposed_data:s0");
-                    Os.chown(path.toString(), uid, uid);
-                    Os.chmod(path.toString(), 0755);
-                } catch (ErrnoException e) {
-                    throw new IOException(e);
-                }
+        // Ensure the directory and any necessary parent directories exist.
+        path.toFile().mkdirs();
+
+        if (SELinux.getFileContext(path.toString()) != "u:object_r:xposed_data:s0") {
+            // SELinux label could be reset after a reboot.
+            try {
+                setSelinuxContextRecursive(path, "u:object_r:xposed_data:s0");
+                Os.chown(path.toString(), uid, uid);
+                Os.chmod(path.toString(), 0755);
+            } catch (ErrnoException e) {
+                throw new IOException(e);
             }
         }
         return path;
     }
 
+     private static void setSelinuxContextRecursive(Path path, String context) throws IOException {
+        try {
+            SELinux.setFileContext(path.toString(), context);
+
+            if (Files.isDirectory(path)) {
+                try (Stream<Path> stream = Files.list(path)) {
+                    for (Path entry : (Iterable<Path>) stream::iterator) {
+                        setSelinuxContextRecursive(entry, context);
+                    }
+                }
+            }
+        } catch (Exception e) {
+            throw new IOException("Failed to recursively set SELinux context for " + path, e);
+        }
+    }
+
     private static class FileLocker {
         private final FileChannel lockChannel;
         private final FileLock locker;

hiddenapi/stubs/src/main/java/android/os/SELinux.java

@@ -9,6 +9,10 @@ public static boolean setFileContext(String path, String context) {
         throw new UnsupportedOperationException("Stub");
     }
 
+    public static String getFileContext(String path) {
+        throw new UnsupportedOperationException("Stub");
+    }
+
     public static boolean setFSCreateContext(String context){
         throw new UnsupportedOperationException("Stub");
     }