Bug #77849 [NEW]: Unexpected segfault attempting to use cloned PDO object

From: jordan dot ledoux at gmail dot com Operating system: Ubuntu (AWS AMI) PHP version: 7.2.17 Package: PDO MySQL Bug Type: Bug Bug description:Unexpected segfault attempting to use cloned PDO object Description: ------------ I encountered a segfault after attempting to use the query() method on the PDO class after it had been unexpectedly cloned. This was actually done on 7.2.16, but I don't have the ability to test it on other version at the moment. Test script: --------------- <?php $dsn = 'mysql:dbname=testdb;host=127.0.0.1'; $user = 'testuser'; $pass = 'testpass'; $db1 = new PDO($dsn, $user, $pass); $result1 = $db1->query("SELECT COUNT(*) FROM testtable"); // Will return PDOStatement object $db2 = clone $db1; $result2 = $db2->query("SELECT COUNT(*) FROM testtable"); // Will segfault Expected result: ---------------- Since there is no case I can think of where cloning a PDO object is necessary, I think that maybe throwing an exception of clone is used on a PDO object would be an acceptable solution, however as I'm not an active participant in internals I defer to the judgement of those implementing. This patch can be accomplished in user space as well (though obviously not the perfect solution) by extending the PDO object and implementing a __clone() method that always throws an exception. Actual result: -------------- Segmentation Fault -- Edit bug report at https://bugs.php.net/bug.php?id=77849&edit=1 -- Try a snapshot (PHP 5.4): https://bugs.php.net/fix.php?id=77849&r=trysnapshot54 Try a snapshot (PHP 5.5): https://bugs.php.net/fix.php?id=77849&r=trysnapshot55 Try a snapshot (trunk): https://bugs.php.net/fix.php?id=77849&r=trysnapshottrunk Fixed in SVN: https://bugs.php.net/fix.php?id=77849&r=fixed Fixed in release: https://bugs.php.net/fix.php?id=77849&r=alreadyfixed Need backtrace: https://bugs.php.net/fix.php?id=77849&r=needtrace Need Reproduce Script: https://bugs.php.net/fix.php?id=77849&r=needscript Try newer version: https://bugs.php.net/fix.php?id=77849&r=oldversion Not developer issue: https://bugs.php.net/fix.php?id=77849&r=support Expected behavior: https://bugs.php.net/fix.php?id=77849&r=notwrong Not enough info: https://bugs.php.net/fix.php?id=77849&r=notenoughinfo Submitted twice: https://bugs.php.net/fix.php?id=77849&r=submittedtwice register_globals: https://bugs.php.net/fix.php?id=77849&r=globals PHP 4 support discontinued: https://bugs.php.net/fix.php?id=77849&r=php4 Daylight Savings: https://bugs.php.net/fix.php?id=77849&r=dst IIS Stability: https://bugs.php.net/fix.php?id=77849&r=isapi Install GNU Sed: https://bugs.php.net/fix.php?id=77849&r=gnused Floating point limitations: https://bugs.php.net/fix.php?id=77849&r=float No Zend Extensions: https://bugs.php.net/fix.php?id=77849&r=nozend MySQL Configuration Error: https://bugs.php.net/fix.php?id=77849&r=mysqlcfg