From 329866d1d09d577de7188bb9f81bfd621ef4684c Mon Sep 17 00:00:00 2001
From: Augustin Cavalier <waddlesplash@gmail.com>
Date: Sat, 10 Aug 2019 19:45:57 -0400
Subject: [PATCH] kernel/vm: Set CLONEABLE_AREA before cloning areas for
 transfer.

---
 src/system/kernel/vm/vm.cpp | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/src/system/kernel/vm/vm.cpp b/src/system/kernel/vm/vm.cpp
index 28cb59bcdb..3d64c4d184 100644
--- a/src/system/kernel/vm/vm.cpp
+++ b/src/system/kernel/vm/vm.cpp
@@ -5992,6 +5992,11 @@ transfer_area(area_id id, void** _address, uint32 addressSpec, team_id target,
 	if (info.team != thread_get_current_thread()->team->id)
 		return B_PERMISSION_DENIED;
 
+	// We need to mark the area cloneable so the following operations work.
+	status = set_area_protection(id, info.protection | B_CLONEABLE_AREA);
+	if (status != B_OK)
+		return status;
+
 	area_id clonedArea = vm_clone_area(target, info.name, _address,
 		addressSpec, info.protection, REGION_NO_PRIVATE_MAP, id, kernel);
 	if (clonedArea < 0)
@@ -6003,6 +6008,9 @@ transfer_area(area_id id, void** _address, uint32 addressSpec, team_id target,
 		return status;
 	}
 
+	// Now we can reset the protection to whatever it was before.
+	set_area_protection(clonedArea, info.protection);
+
 	// TODO: The clonedArea is B_SHARED_AREA, which is not really desired.
 
 	return clonedArea;