Merge branch 'PHP-8.3' into PHP-8.4

* PHP-8.3:
  Preserve bare NUL access with open_basedir on Windows (#24158)

Author: shivammathur

main/fopen_wrappers.c

@@ -151,6 +151,14 @@ PHPAPI int php_check_specific_open_basedir(const char *basedir, const char *path
 	size_t path_len;
 	int nesting_level = 0;
 
+#ifdef PHP_WIN32
+	/* Preserve the working-directory permission check for bare NUL. */
+	if ((strcasecmp(path, "NUL") == 0 || strcasecmp(path, "NUL:") == 0)
+			&& php_check_specific_open_basedir(basedir, ".") == 0) {
+		return 0;
+	}
+#endif
+
 	/* Special case basedir==".": Use script-directory */
 	if (strcmp(basedir, ".") || !VCWD_GETCWD(local_open_basedir, MAXPATHLEN)) {
 		/* Else use the unmodified path */

tests/security/open_basedir_nul_win32.phpt

@@ -0,0 +1,57 @@
+--TEST--
+GH-24148: Bare NUL remains usable with open_basedir on Windows
+--SKIPIF--
+<?php
+if (PHP_OS_FAMILY !== 'Windows') die('skip Windows only');
+if (!function_exists('proc_open')) die('skip proc_open unavailable');
+?>
+--INI--
+open_basedir=
+--FILE--
+<?php
+chdir(__DIR__);
+foreach ([
+    'Directory allowed' => __DIR__,
+    'Devices explicitly allowed' => __FILE__ . ';NUL;NUL:',
+    'Only file allowed' => __FILE__,
+] as $label => $basedir) {
+    echo "$label:\n";
+    var_dump(ini_set('open_basedir', $basedir) !== false);
+    foreach (['NUL', 'nul:'] as $name) {
+        $stream = @fopen($name, 'c');
+        var_dump(is_resource($stream));
+        if (is_resource($stream)) {
+            fclose($stream);
+        }
+    }
+    $process = @proc_open('cmd /c exit 0', [
+        ['pipe', 'r'], ['file', 'NUL', 'w'], ['file', 'nul:', 'w'],
+    ], $pipes);
+    if (is_resource($process)) {
+        fclose($pipes[0]);
+        var_dump(proc_close($process) === 0);
+    } else {
+        var_dump(false);
+    }
+    var_dump(file_get_contents(__FILE__) !== false);
+}
+?>
+--EXPECT--
+Directory allowed:
+bool(true)
+bool(true)
+bool(true)
+bool(true)
+bool(true)
+Devices explicitly allowed:
+bool(true)
+bool(true)
+bool(true)
+bool(true)
+bool(true)
+Only file allowed:
+bool(true)
+bool(false)
+bool(false)
+bool(false)
+bool(true)