ext/standard: Reject NUL bytes in dl() (#22358)

Similar to #21942 and #21871. The dl function in std extension now silently truncates
from NUL bytes. Now we reject any parameter containing NUL byte(s) by throwing a 
ValueErrpr

Author: LamentXU123

NEWS

@@ -254,6 +254,8 @@ PHP                                                                        NEWS
     (Weilin Du)
   . getenv() and putenv() now raises a ValueError when the first argument
     contains null bytes. (Weilin Du)
+  . dl() now raises a ValueError when the $extension_filename argument
+    contains null bytes. (Weilin Du)
   . parse_str() now raises a ValueError when the $string argument contains
     null bytes. (Weilin Du)
   . proc_open() now raises a ValueError when the $cwd argument contains

UPGRADING

@@ -151,6 +151,8 @@ PHP 8.6 UPGRADE NOTES
     argument value is passed.
   . getenv() and putenv() now raises a ValueError when the first argument
     contains null bytes.
+  . dl() now raises a ValueError when the $extension_filename argument
+    contains null bytes.
   . parse_str() now raises a ValueError when the $string argument contains
     null bytes.
   . linkinfo() now raises a ValueError when the $path argument is empty.

ext/standard/dl.c

@@ -43,7 +43,7 @@ PHPAPI PHP_FUNCTION(dl)
 	size_t filename_len;
 
 	ZEND_PARSE_PARAMETERS_START(1, 1)
-		Z_PARAM_STRING(filename, filename_len)
+		Z_PARAM_PATH(filename, filename_len)
 	ZEND_PARSE_PARAMETERS_END();
 
 	if (!PG(enable_dl)) {

ext/standard/tests/general_functions/dl_null_bytes.phpt

@@ -0,0 +1,14 @@
+--TEST--
+dl() rejects null bytes in extension filename
+--FILE--
+<?php
+
+try {
+    dl("foo\0bar");
+} catch (ValueError $e) {
+    echo $e->getMessage(), "\n";
+}
+
+?>
+--EXPECT--
+dl(): Argument #1 ($extension_filename) must not contain any null bytes