Issue #3436395 by kristiaanvandeneynde, xjm, smustgrave, gabesullice,...

Issue #3436395 by kristiaanvandeneynde, xjm, smustgrave, gabesullice, longwave, catch, effulgentsia, heddn, mcdruid, dww, bbrala, deviantintegral, greggles, benjifisher, drumm, larowlan, poker10: UserRolesCacheContext can lead to poisoned cache returns for user 1

(cherry picked from commit da8c7555)

core/lib/Drupal/Core/Cache/Context/UserRolesCacheContext.php

@@ -27,13 +27,6 @@ public static function getLabel() {
    * {@inheritdoc}
    */
   public function getContext($role = NULL) {
-    // User 1 does not actually have any special behavior for roles; this is
-    // added as additional security and backwards compatibility protection for
-    // SA-CORE-2015-002.
-    // @todo Remove in Drupal 9.0.0.
-    if ($this->user->id() == 1) {
-      return 'is-super-user';
-    }
     if ($role === NULL) {
       return implode(',', $this->user->getRoles());
     }

core/tests/Drupal/KernelTests/Core/Render/RenderCacheTest.php

-<?php
-
-declare(strict_types=1);
-
-namespace Drupal\KernelTests\Core\Render;
-
-use Drupal\KernelTests\KernelTestBase;
-use Drupal\Tests\user\Traits\UserCreationTrait;
-
-/**
- * Tests the caching of render items via functional tests.
- *
- * @todo Remove or updated in https://www.drupal.org/project/drupal/issues/3436395.
- *
- * @group Render
- */
-class RenderCacheTest extends KernelTestBase {
-
-  use UserCreationTrait;
-
-  /**
-   * {@inheritdoc}
-   */
-  protected static $modules = ['user', 'system'];
-
-  /**
-   * {@inheritdoc}
-   *
-   * @todo Remove and fix test to not rely on super user.
-   * @see https://www.drupal.org/project/drupal/issues/3437620
-   */
-  protected bool $usesSuperUserAccessPolicy = TRUE;
-
-  /**
-   * {@inheritdoc}
-   */
-  protected function setUp(): void {
-    parent::setUp();
-    $this->installEntitySchema('user');
-    $this->installConfig(['user']);
-  }
-
-  /**
-   * Tests that user 1 has a different permission context with the same roles.
-   */
-  public function testUser1PermissionContext(): void {
-    $this->doTestUser1WithContexts(['user.permissions']);
-  }
-
-  /**
-   * Tests that user 1 has a different roles context with the same roles.
-   */
-  public function testUser1RolesContext(): void {
-    $this->doTestUser1WithContexts(['user.roles']);
-  }
-
-  /**
-   * Ensures that user 1 has a unique render cache for the given context.
-   *
-   * @param string[] $contexts
-   *   List of cache contexts to use.
-   */
-  protected function doTestUser1WithContexts($contexts) {
-    // Test that user 1 does not share the cache with other users who have the
-    // same roles, even when using a role-based cache context.
-    $user1 = $this->createUser();
-    $this->assertEquals(1, $user1->id());
-    $first_authenticated_user = $this->createUser();
-    $second_authenticated_user = $this->createUser();
-    $admin_user = $this->createUser([], NULL, TRUE);
-
-    $this->assertEquals($user1->getRoles(), $first_authenticated_user->getRoles(), 'User 1 has the same roles as an authenticated user.');
-    // Impersonate user 1 and render content that only user 1 should have
-    // permission to see.
-    \Drupal::service('account_switcher')->switchTo($user1);
-    $test_element = [
-      '#cache' => [
-        'keys' => ['test'],
-        'contexts' => $contexts,
-      ],
-    ];
-    $element = $test_element;
-    $element['#markup'] = 'content for admin users';
-    $output = \Drupal::service('renderer')->renderRoot($element);
-    $this->assertEquals('content for admin users', $output);
-
-    // Verify the cache is working by rendering the same element but with
-    // different markup passed in; the result should be the same.
-    $element = $test_element;
-    $element['#markup'] = 'should not be used';
-    $output = \Drupal::service('renderer')->renderRoot($element);
-    $this->assertEquals('content for admin users', $output);
-    \Drupal::service('account_switcher')->switchBack();
-
-    // Verify that the first authenticated user does not see the same content
-    // as user 1.
-    \Drupal::service('account_switcher')->switchTo($first_authenticated_user);
-    $element = $test_element;
-    $element['#markup'] = 'content for authenticated users';
-    $output = \Drupal::service('renderer')->renderRoot($element);
-    $this->assertEquals('content for authenticated users', $output);
-    \Drupal::service('account_switcher')->switchBack();
-
-    // Verify that the second authenticated user shares the cache with the
-    // first authenticated user.
-    \Drupal::service('account_switcher')->switchTo($second_authenticated_user);
-    $element = $test_element;
-    $element['#markup'] = 'should not be used';
-    $output = \Drupal::service('renderer')->renderRoot($element);
-    $this->assertEquals('content for authenticated users', $output);
-    \Drupal::service('account_switcher')->switchBack();
-
-    // The admin user should have the same cache as user 1, as the admin role
-    // has the same permissions hash.
-    \Drupal::service('account_switcher')->switchTo($admin_user);
-    $element = $test_element;
-    $element['#markup'] = 'content that is role specific';
-    $output = \Drupal::service('renderer')->renderRoot($element);
-    $expected = in_array('user.roles', $contexts, TRUE) ? 'content that is role specific' : 'content for admin users';
-    $this->assertEquals($expected, $output);
-    \Drupal::service('account_switcher')->switchBack();
-  }
-
-}