diff --git a/core/lib/Drupal/Core/Config/Config.php b/core/lib/Drupal/Core/Config/Config.php
index 51ade6c..543417e 100644
--- a/core/lib/Drupal/Core/Config/Config.php
+++ b/core/lib/Drupal/Core/Config/Config.php
@@ -68,7 +68,9 @@ class Config extends StorableConfigBase {
    *   The typed configuration manager service.
    */
   public function __construct($name, StorageInterface $storage, EventDispatcherInterface $event_dispatcher, TypedConfigManagerInterface $typed_config) {
-    $this->name = $name;
+    // Calling parent constructor is needed for properly validate the
+    // configuration object name.
+    parent::__construct($name);
     $this->storage = $storage;
     $this->eventDispatcher = $event_dispatcher;
     $this->typedConfigManager = $typed_config;
@@ -204,9 +206,6 @@ public function clear($key) {
    * {@inheritdoc}
    */
   public function save() {
-    // Validate the configuration object name before saving.
-    static::validateName($this->name);
-
     // If there is a schema for this configuration object, cast all values to
     // conform to the schema.
     if ($this->typedConfigManager->hasConfigSchema($this->name)) {
diff --git a/core/lib/Drupal/Core/Config/ConfigBase.php b/core/lib/Drupal/Core/Config/ConfigBase.php
index eee76a2..bc370a2 100644
--- a/core/lib/Drupal/Core/Config/ConfigBase.php
+++ b/core/lib/Drupal/Core/Config/ConfigBase.php
@@ -61,6 +61,18 @@
   const MAX_NAME_LENGTH = 250;
 
   /**
+   * Constructs a configuration object.
+   *
+   * @param string $name
+   *   The name of the configuration object being constructed.
+   */
+  public function __construct($name) {
+    // Validate the configuration object name.
+    static::validateName($name);
+    $this->name = $name;
+  }
+
+  /**
    * Returns the name of this configuration object.
    *
    * @return string
@@ -80,6 +92,8 @@ public function getName() {
    *   The configuration object.
    */
   public function setName($name) {
+    // Validate the configuration object.
+    static::validateName($name);
     $this->name = $name;
     return $this;
   }
@@ -87,6 +101,11 @@ public function setName($name) {
   /**
    * Validates the configuration object name.
    *
+   * A valid name must:
+   * - Be namespaced by its owner (i.e. contain at least one '.').
+   * - Be shorter than Config::MAX_NAME_LENGTH characters.
+   * - Not contain any of the following characters: ? : * < > " ' / \
+   *
    * @param string $name
    *  The name of the configuration object.
    *
@@ -95,7 +114,7 @@ public function setName($name) {
    * @see Config::MAX_NAME_LENGTH
    */
   public static function validateName($name) {
-    // The name must be namespaced by owner.
+    // The name must be namespaced by its owner.
     if (strpos($name, '.') === FALSE) {
       throw new ConfigNameException(SafeMarkup::format('Missing namespace in Config object name @name.', array(
         '@name' => $name,
diff --git a/core/modules/language/src/Config/LanguageConfigOverride.php b/core/modules/language/src/Config/LanguageConfigOverride.php
index 5be48ad..8a88562 100644
--- a/core/modules/language/src/Config/LanguageConfigOverride.php
+++ b/core/modules/language/src/Config/LanguageConfigOverride.php
@@ -41,7 +41,9 @@ class LanguageConfigOverride extends StorableConfigBase {
    *   The event dispatcher.
    */
   public function __construct($name, StorageInterface $storage, TypedConfigManagerInterface $typed_config, EventDispatcherInterface $event_dispatcher) {
-    $this->name = $name;
+    // Calling parent constructor is needed for properly validate the
+    // configuration object name.
+    parent::__construct($name);
     $this->storage = $storage;
     $this->typedConfigManager = $typed_config;
     $this->eventDispatcher = $event_dispatcher;
diff --git a/core/tests/Drupal/Tests/Core/Access/AccessResultTest.php b/core/tests/Drupal/Tests/Core/Access/AccessResultTest.php
index 123888a..fb5fee4 100644
--- a/core/tests/Drupal/Tests/Core/Access/AccessResultTest.php
+++ b/core/tests/Drupal/Tests/Core/Access/AccessResultTest.php
@@ -433,7 +433,9 @@ public function testCacheTags() {
     $this->assertEquals($a, $b);
 
     // ::cacheUntilConfigurationChanges() convenience method.
-    $configuration = $this->getMock('\Drupal\Core\Config\ConfigBase');
+    $configuration = $this->getMockBuilder('\Drupal\Core\Config\ConfigBase')
+      ->disableOriginalConstructor()
+      ->getMock();
     $configuration->expects($this->any())
       ->method('getCacheTags')
       ->will($this->returnValue(array('config:foo.bar.baz')));
diff --git a/core/tests/Drupal/Tests/Core/Config/ImmutableConfigTest.php b/core/tests/Drupal/Tests/Core/Config/ImmutableConfigTest.php
index 8b0bbf8..f7c83de 100644
--- a/core/tests/Drupal/Tests/Core/Config/ImmutableConfigTest.php
+++ b/core/tests/Drupal/Tests/Core/Config/ImmutableConfigTest.php
@@ -28,13 +28,13 @@ protected function setUp() {
     $storage = $this->getMock('Drupal\Core\Config\StorageInterface');
     $event_dispatcher = $this->getMock('Symfony\Component\EventDispatcher\EventDispatcherInterface');
     $typed_config = $this->getMock('Drupal\Core\Config\TypedConfigManagerInterface');
-    $this->config = new ImmutableConfig('test', $storage, $event_dispatcher, $typed_config);
+    $this->config = new ImmutableConfig('test.immutable_config', $storage, $event_dispatcher, $typed_config);
   }
 
   /**
    * @covers ::set
    * @expectedException \Drupal\Core\Config\ImmutableConfigException
-   * @expectedExceptionMessage Can not set values on immutable configuration test:name. Use \Drupal\Core\Config\ConfigFactoryInterface::getEditable() to retrieve a mutable configuration object
+   * @expectedExceptionMessage Can not set values on immutable configuration test.immutable_config:name. Use \Drupal\Core\Config\ConfigFactoryInterface::getEditable() to retrieve a mutable configuration object
    */
   public function testSet() {
     $this->config->set('name', 'value');
@@ -43,7 +43,7 @@ public function testSet() {
   /**
    * @covers ::clear
    * @expectedException \Drupal\Core\Config\ImmutableConfigException
-   * @expectedExceptionMessage Can not clear name key in immutable configuration test. Use \Drupal\Core\Config\ConfigFactoryInterface::getEditable() to retrieve a mutable configuration object
+   * @expectedExceptionMessage Can not clear name key in immutable configuration test.immutable_config. Use \Drupal\Core\Config\ConfigFactoryInterface::getEditable() to retrieve a mutable configuration object
    */
   public function testClear() {
     $this->config->clear('name');
@@ -52,7 +52,7 @@ public function testClear() {
   /**
    * @covers ::save
    * @expectedException \Drupal\Core\Config\ImmutableConfigException
-   * @expectedExceptionMessage Can not save immutable configuration test. Use \Drupal\Core\Config\ConfigFactoryInterface::getEditable() to retrieve a mutable configuration object
+   * @expectedExceptionMessage Can not save immutable configuration test.immutable_config. Use \Drupal\Core\Config\ConfigFactoryInterface::getEditable() to retrieve a mutable configuration object
    */
   public function testSave() {
     $this->config->save();
@@ -61,7 +61,7 @@ public function testSave() {
   /**
    * @covers ::delete
    * @expectedException \Drupal\Core\Config\ImmutableConfigException
-   * @expectedExceptionMessage Can not delete immutable configuration test. Use \Drupal\Core\Config\ConfigFactoryInterface::getEditable() to retrieve a mutable configuration object
+   * @expectedExceptionMessage Can not delete immutable configuration test.immutable_config. Use \Drupal\Core\Config\ConfigFactoryInterface::getEditable() to retrieve a mutable configuration object
    */
   public function testDelete() {
     $this->config->delete();