functools caching and doc.

volatility3/framework/symbols/linux/utilities/tainting.py

@@ -1,3 +1,5 @@
+import functools
+
 from volatility3 import framework
 from volatility3.framework import interfaces
 from volatility3.framework.constants import linux as linux_constants
@@ -18,11 +20,18 @@ class Tainting(interfaces.configuration.VersionableInterface):
     framework.require_interface_version(*_required_framework_version)
 
     @classmethod
+    @functools.lru_cache
     def _get_kernel_taint_flags_list(
         cls,
         context: interfaces.context.ContextInterface,
         kernel_module_name: str,
     ) -> Optional[List[interfaces.objects.ObjectInterface]]:
+        """Determine whether the kernel embeds taint flags definition
+        in-memory or not.
+
+        Returns:
+            A list of "taint_flag" kernel objects if taint_flags symbok exists
+        """
         kernel = context.modules[kernel_module_name]
         if kernel.has_symbol("taint_flags"):
             return list(kernel.object_from_symbol("taint_flags"))