diff --git a/core/lib/Drupal/Core/Config/ConfigNameException.php b/core/lib/Drupal/Core/Config/ConfigNameException.php
new file mode 100644
index 0000000..f02f227
--- /dev/null
+++ b/core/lib/Drupal/Core/Config/ConfigNameException.php
@@ -0,0 +1,12 @@
+<?php
+
+/**
+ * Contains \Drupal\Core\Config\ConfigNameException.
+ */
+
+namespace Drupal\Core\Config;
+
+/**
+ * Defines an exception thrown when a config object name is invalid.
+ */
+class ConfigNameException extends ConfigException {}
diff --git a/core/modules/config/lib/Drupal/config/Tests/ConfigCRUDTest.php b/core/modules/config/lib/Drupal/config/Tests/ConfigCRUDTest.php
index 56e5ecf..a4a37db 100644
--- a/core/modules/config/lib/Drupal/config/Tests/ConfigCRUDTest.php
+++ b/core/modules/config/lib/Drupal/config/Tests/ConfigCRUDTest.php
@@ -7,6 +7,7 @@
 
 namespace Drupal\config\Tests;
 
+use Drupal\Core\Config\ConfigNameException;
 use Drupal\simpletest\DrupalUnitTestBase;
 
 /**
@@ -103,4 +104,45 @@ function testCRUD() {
     $this->assertIdentical($new_config->get('404'), $expected_values['404']);
   }
 
+  /**
+   * Tests the validation of configuration object names.
+   */
+  function testNameValidation() {
+    // Try to save an object name with no namespace.
+    $name = 'nonamespace';
+    $message = 'Expected ConfigNameException was thrown for a name without a namespace.';
+    try {
+      $config = config($name);
+      $config->save();
+      $this->fail($message);
+    }
+    catch (ConfigException $e) {
+      $this->pass($message);
+    }
+
+    // Try to save an object with a name longer than 250 characters.
+    $name = 'config_test.herman_melville.moby_dick_or_the_whale.harper_1851.now_small_fowls_flew_screaming_over_the_yet_yawning_gulf_a_sullen_white_surf_beat_against_its_steep_sides_then_all_collapsed_and_the_great_shroud_of_the_sea_rolled_on_as_it_rolled_five_thousand_years_ago';
+    $message = 'Expected ConfigNameException was thrown for a name longer than Config::MAX_NAME_LENGTH.'
+    try {
+      $config = config($name);
+      $config->save();
+      $this->fail($message);
+    }
+    catch (ConfigNameException $e) {
+      $this->pass($message);
+    }
+
+    // Try to save a valid object name.
+    $name = 'config.namespace';
+    $message = 'ConfigNameException was not thrown for a valid object name.';
+    try {
+      $config = config($name);
+      $config->save();
+      $this->pass($message);
+    }
+    catch (ConfigException $e) {
+      $this->fail($message);
+    }
+  }
+
 }