From 101486279f466d562f37e190f88e187239a3c79e Mon Sep 17 00:00:00 2001
From: Andreas Kling <kling@serenityos.org>
Date: Mon, 26 Jul 2021 00:27:42 +0200
Subject: [PATCH] Kernel: Clear the COW bits when making an AnonymousVMObject
 volatile

---
 Kernel/VM/AnonymousVMObject.cpp | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/Kernel/VM/AnonymousVMObject.cpp b/Kernel/VM/AnonymousVMObject.cpp
index 1f7356d6eb..4c15078a2e 100644
--- a/Kernel/VM/AnonymousVMObject.cpp
+++ b/Kernel/VM/AnonymousVMObject.cpp
@@ -224,6 +224,9 @@ KResult AnonymousVMObject::set_volatile(bool is_volatile, bool& was_purged)
 
         m_shared_committed_cow_pages = nullptr;
 
+        if (!m_cow_map.is_null())
+            m_cow_map = {};
+
         m_volatile = true;
         m_was_purged = false;
         return KSuccess;