Merge branch 'PHP-8.4'

* PHP-8.4:
  Fix GH-18417: Windows SHM reattachment fails when increasing memory_consumption or jit_buffer_size

Author: nielsdos

ext/opcache/shared_alloc_win32.c

@@ -69,9 +69,9 @@ static void zend_win_error_message(int type, char *msg, int err)
 	php_win32_error_msg_free(buf);
 }
 
-static char *create_name_with_username(char *name)
+static char *create_name_with_username(const char *name, size_t unique_id)
 {
-	static char newname[MAXPATHLEN + 1 + 32 + 1 + 20 + 1 + 32 + 1];
+	static char newname[MAXPATHLEN + 1 + 32 + 1 + 20 + 1 + 32 + sizeof("ffffffffffffffff")-1 + 1];
 	char *p = newname;
 	p += strlcpy(newname, name, MAXPATHLEN + 1);
 	*(p++) = '@';
@@ -80,15 +80,19 @@ static char *create_name_with_username(char *name)
 	p += strlcpy(p, sapi_module.name, 21);
 	*(p++) = '@';
 	p = zend_mempcpy(p, zend_system_id, 32);
-	*(p++) = '\0';
+	if (unique_id) {
+		p += snprintf(p, sizeof("ffffffffffffffff"), "%zx", unique_id) + 1;
+	} else {
+		*(p++) = '\0';
+	}
 	ZEND_ASSERT(p - newname <= sizeof(newname));
 
 	return newname;
 }
 
 void zend_shared_alloc_create_lock(void)
 {
-	memory_mutex = CreateMutex(NULL, FALSE, create_name_with_username(ACCEL_MUTEX_NAME));
+	memory_mutex = CreateMutex(NULL, FALSE, create_name_with_username(ACCEL_MUTEX_NAME, 0));
 	if (!memory_mutex) {
 		zend_accel_error(ACCEL_LOG_FATAL, "Cannot create mutex (error %lu)", GetLastError());
 		return;
@@ -222,7 +226,7 @@ static int create_segments(size_t requested_size, zend_shared_segment ***shared_
 	   can be called before the child process is killed. In this case, the mapping will fail
 	   and we have to sleep some time (until the child releases the mapping object) and retry.*/
 	do {
-		memfile = OpenFileMapping(FILE_MAP_READ|FILE_MAP_WRITE|FILE_MAP_EXECUTE, 0, create_name_with_username(ACCEL_FILEMAP_NAME));
+		memfile = OpenFileMapping(FILE_MAP_READ|FILE_MAP_WRITE|FILE_MAP_EXECUTE, 0, create_name_with_username(ACCEL_FILEMAP_NAME, requested_size));
 		if (memfile == NULL) {
 			err = GetLastError();
 			break;
@@ -267,7 +271,7 @@ static int create_segments(size_t requested_size, zend_shared_segment ***shared_
 	(*shared_segments_p)[0] = shared_segment;
 
 	memfile	= CreateFileMapping(INVALID_HANDLE_VALUE, NULL, PAGE_EXECUTE_READWRITE | SEC_COMMIT, size_high, size_low,
-								create_name_with_username(ACCEL_FILEMAP_NAME));
+								create_name_with_username(ACCEL_FILEMAP_NAME, requested_size));
 	if (memfile == NULL) {
 		err = GetLastError();
 		zend_shared_alloc_unlock_win32();

ext/opcache/tests/gh18417.phpt

@@ -0,0 +1,40 @@
+--TEST--
+GH-18417 (Windows SHM reattachment fails when increasing memory_consumption or jit_buffer_size)
+--SKIPIF--
+<?php
+$extDir = ini_get('extension_dir');
+if (!file_exists($extDir . '/php_opcache.dll')) {
+    die('skip Opcache DLL not found in extension_dir (Windows-only)');
+}
+?>
+--FILE--
+<?php
+$memory_consumption = (int) ini_get("opcache.memory_consumption");
+$new_memory_consumption = $memory_consumption * 2;
+$extension_dir = ini_get("extension_dir");
+
+$descriptorspec = [
+    0 => ["pipe", "r"],
+    1 => ["pipe", "w"],
+    2 => ["pipe", "w"],
+];
+
+$proc = proc_open([
+    PHP_BINARY,
+    "-n",
+    "-d", "extension_dir=$extension_dir",
+    "-d", "zend_extension=opcache",
+    "-d", "opcache.memory_consumption=$new_memory_consumption",
+    "-d", "opcache.enable=1",
+    "-d", "opcache.enable_cli=1",
+    "-r",
+    "echo 1;"
+], $descriptorspec, $pipes);
+
+echo stream_get_contents($pipes[1]);
+echo stream_get_contents($pipes[2]);
+
+proc_close($proc);
+?>
+--EXPECT--
+1