From 093333740468ad0af68280d53c928ed4bacfeea1 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?J=C3=A9r=C3=B4me=20Gardou?= <jerome.gardou@reactos.org>
Date: Wed, 18 Nov 2020 17:45:47 +0100
Subject: [PATCH] [NTOS/MM] Do not dirtify section pages for system-space maps

Cc does it for itself.
---
 ntoskrnl/mm/section.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/ntoskrnl/mm/section.c b/ntoskrnl/mm/section.c
index 46bf5cb571d..f108533ed2e 100644
--- a/ntoskrnl/mm/section.c
+++ b/ntoskrnl/mm/section.c
@@ -3343,8 +3343,12 @@ MmFreeSectionPage(PVOID Context, MEMORY_AREA* MemoryArea, PVOID Address,
         else
         {
             if (Process)
+            {
                 MmDeleteRmap(Page, Process, Address);
-            MmUnsharePageEntrySectionSegment(MemoryArea, Segment, &Offset, Dirty, FALSE, NULL);
+            }
+
+            /* We don't dirtify for System Space Maps. We let Cc manage that */
+            MmUnsharePageEntrySectionSegment(MemoryArea, Segment, &Offset, Process ? Dirty : FALSE, FALSE, NULL);
         }
     }
 }