Merge branch 'PHP-7.3' into PHP-7.4

* PHP-7.3:
  Fix #79825: opcache.file_cache causes SIGSEGV with custom opcode handlers

Author: SammyK

NEWS

@@ -23,6 +23,8 @@ PHP                                                                        NEWS
   . Fixed bug #80002 (calc free space for new interned string is wrong).
     (t-matsuno)
   . Fixed bug #80046 (FREE for SWITCH_STRING optimized away). (Nikita)
+  . Fixed bug #79825 (opcache.file_cache causes SIGSEGV when custom opcode
+    handlers changed). (SammyK)
 
 - PDO:
   . Fixed bug #80027 (Terrible performance using $query->fetch on queries with

ext/opcache/ZendAccelerator.c

@@ -2655,6 +2655,9 @@ static void accel_gen_system_id(void)
 {
 	PHP_MD5_CTX context;
 	unsigned char digest[16];
+	zend_module_entry *module;
+	zend_extension *extension;
+	zend_llist_position pos;
 
 	PHP_MD5Init(&context);
 	PHP_MD5Update(&context, PHP_VERSION, sizeof(PHP_VERSION)-1);
@@ -2665,6 +2668,19 @@ static void accel_gen_system_id(void)
 		PHP_MD5Update(&context, __DATE__, sizeof(__DATE__)-1);
 		PHP_MD5Update(&context, __TIME__, sizeof(__TIME__)-1);
 	}
+	/* Modules may have changed after restart which can cause dangling pointers from
+     * custom opcode handlers in the second-level cache files
+     */
+	ZEND_HASH_FOREACH_PTR(&module_registry, module) {
+		PHP_MD5Update(&context, module->name, strlen(module->name));
+		PHP_MD5Update(&context, module->version, strlen(module->version));
+	} ZEND_HASH_FOREACH_END();
+	extension = (zend_extension *) zend_llist_get_first_ex(&zend_extensions, &pos);
+	while (extension) {
+		PHP_MD5Update(&context, extension->name, strlen(extension->name));
+		PHP_MD5Update(&context, extension->version, strlen(extension->version));
+		extension = (zend_extension *) zend_llist_get_next_ex(&zend_extensions, &pos);
+	}
 	PHP_MD5Final(digest, &context);
 	php_hash_bin2hex(accel_system_id, digest, sizeof digest);
 }