Allow enabling sand duping (#10191)

Because this exploit has been widely known for years and has not been fixed by Mojang, we decided that it was worth allowing people to toggle it on/off due to how easy it is to make it configurable.

It should be noted that this decision does not promise all future exploits will be configurable. 

1 files changed, 22 insertions, 0 deletions

diff --git a/patches/server/0859-Prevent-GameEvents-being-fired-from-unloaded-chunks.patch b/patches/server/0859-Prevent-GameEvents-being-fired-from-unloaded-chunks.patch
new file mode 100644
index 0000000000..b0714f833f
--- /dev/null
+++ b/patches/server/0859-Prevent-GameEvents-being-fired-from-unloaded-chunks.patch
@@ -0,0 +1,22 @@
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: Shane Freeder <[email protected]>
+Date: Wed, 5 Apr 2023 20:15:47 +0100
+Subject: [PATCH] Prevent GameEvents being fired from unloaded chunks
+
+
+diff --git a/src/main/java/net/minecraft/server/level/ServerLevel.java b/src/main/java/net/minecraft/server/level/ServerLevel.java
+index 5f1a4a35d2179b7ff5a95390f82d65cacf4fd457..a6af6585aca50033f45138a4408218b056b8b785 100644
+--- a/src/main/java/net/minecraft/server/level/ServerLevel.java
++++ b/src/main/java/net/minecraft/server/level/ServerLevel.java
+@@ -1368,6 +1368,11 @@ public class ServerLevel extends Level implements WorldGenLevel {
+ 
+     @Override
+     public void gameEvent(GameEvent event, Vec3 emitterPos, GameEvent.Context emitter) {
++        // Paper start - Prevent GameEvents being fired from unloaded chunks
++        if (this.getChunkIfLoadedImmediately((Mth.floor(emitterPos.x) >> 4), (Mth.floor(emitterPos.z) >> 4)) == null) {
++            return;
++        }
++        // Paper end - Prevent GameEvents being fired from unloaded chunks
+         this.gameEventDispatcher.post(event, emitterPos, emitter);
+     }
+