Implement stricter extension compatibility check

This hardens the dynamic module loading by checking the linker compatibility
between the core and the dynamic module. This likely should be extended
for the CRT as well, as 2015, 2017 and 2019 versions of Visual Studio
all have same DLL name for the CRT.

1 files changed, 10 insertions, 0 deletions

diff --git a/ext/standard/dl.c b/ext/standard/dl.c
index 226474efbf..ddc87a40d0 100644
--- a/ext/standard/dl.c
+++ b/ext/standard/dl.c
@@ -167,6 +167,16 @@ PHPAPI int php_load_extension(char *filename, int type, int start_now)
 		efree(err1);
 	}
 
+#ifdef PHP_WIN32
+	if (!php_win32_image_compatible(libpath, NULL, &err1)) {
+			php_error_docref(NULL, error_type, err1);
+			efree(err1);
+			efree(libpath);
+			DL_UNLOAD(handle);
+			return FAILURE;
+	}
+#endif
+
 	efree(libpath);
 
 	get_module = (zend_module_entry *(*)(void)) DL_FETCH_SYMBOL(handle, "get_module");