diff --git a/linker/linker_namespaces.cpp b/linker/linker_namespaces.cpp
new file mode 100644
index 0000000..675f324
--- /dev/null
+++ b/linker/linker_namespaces.cpp
@@ -0,0 +1,59 @@
+/*
+ * Copyright (C) 2016 The Android Open Source Project
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *  * Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ *  * Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
+ * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include "linker_namespaces.h"
+#include "linker_utils.h"
+
+#include <vector>
+
+bool android_namespace_t::is_accessible(const std::string& file) {
+  if (!is_isolated_) {
+    return true;
+  }
+
+  for (const auto& dir : ld_library_paths_) {
+    if (file_is_in_dir(file, dir)) {
+      return true;
+    }
+  }
+
+  for (const auto& dir : default_library_paths_) {
+    if (file_is_in_dir(file, dir)) {
+      return true;
+    }
+  }
+
+  for (const auto& dir : permitted_paths_) {
+    if (file_is_under_dir(file, dir)) {
+      return true;
+    }
+  }
+
+  return false;
+}
+