security #cve-2019-10912 [Cache][PHPUnit Bridge] Prevent destructors with side-effects from being unserialized (nicolas-grekas)

This PR was merged into the 3.4 branch.

Discussion
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[Cache][PHPUnit Bridge] Prevent destructors with side-effects from being unserialized

| Q             | A
| ------------- | ---
| Branch?       | 3.4
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | -
| License       | MIT
| Doc PR        | -

Reported for `FilesystemCommonTrait` at https://www.intigriti.com/company/submission/CfDJ8Pja6NZvkpNCmx5vVyiGSn7yW8c1j4H0-cnAhIk6fbstOMm028X-XD1kmSuQkGB2n0cRyyVrA2yAiLN_I0EVilaKVLSiSa0UXZJGfN1h85vmk5c2dBBpu619r1YQEIjcXA

Commits
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4fb9752816 Prevent destructors with side-effects from being unserialized

Author: nicolas-grekas

Tests/Kernel/ConcreteMicroKernel.php

@@ -64,6 +64,16 @@ public function getLogDir()
         return $this->cacheDir;
     }
 
+    public function __sleep()
+    {
+        throw new \BadMethodCallException('Cannot serialize '.__CLASS__);
+    }
+
+    public function __wakeup()
+    {
+        throw new \BadMethodCallException('Cannot unserialize '.__CLASS__);
+    }
+
     public function __destruct()
     {
         $fs = new Filesystem();