UB when freeing a cloned _ZendTestFiber

[YuanchengJiang]

Description

The following code:

<?php
$fiber = new _ZendTestFiber(function (): int {
});
$fusion = $fiber;
clone $fusion;

Resulted in this output:

/php-src/ext/zend_test/fiber.c:205:3: runtime error: member access within misaligned address 0x736574646e657a5f for type 'zend_test_fiber' (aka 'struct _zend_test_fiber'), which requires 8 byte alignment

To reproduce:

-d "zend_extension=/php-src/modules/opcache.so" -d "opcache.enable_cli=1"

There are some similar issues, not sure if it is a dup.

PHP Version

nightly

Operating System

ubuntu 22.04

[cmb69]

Unless there is the need to clone instances of _ZendTestFiber, we can just disallow this:

 ext/zend_test/fiber.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/ext/zend_test/fiber.c b/ext/zend_test/fiber.c
index 30dbfa06e5..fa285aa2d6 100644
--- a/ext/zend_test/fiber.c
+++ b/ext/zend_test/fiber.c
@@ -352,4 +352,5 @@ void zend_test_fiber_init(void)
 	zend_test_fiber_handlers = std_object_handlers;
 	zend_test_fiber_handlers.dtor_obj = zend_test_fiber_object_destroy;
 	zend_test_fiber_handlers.free_obj = zend_test_fiber_object_free;
+	zend_test_fiber_handlers.clone_obj = NULL;
 }