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From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Zach Brown <zach@zachbr.io>
Date: Tue, 23 Jul 2019 20:44:47 -0500
Subject: [PATCH] Do not let the server load chunks from newer versions
If the server attempts to load a chunk generated by a newer version of
the game, immediately stop the server to prevent data corruption.
You can override this functionality at your own peril.
diff --git a/src/main/java/net/minecraft/server/ChunkRegionLoader.java b/src/main/java/net/minecraft/server/ChunkRegionLoader.java
index ac58fcb7985ebe0cfdab6e1400deb37c233ff637..66a39d75394236f5ee745da7ac0b0ac5fe71f911 100644
--- a/src/main/java/net/minecraft/server/ChunkRegionLoader.java
+++ b/src/main/java/net/minecraft/server/ChunkRegionLoader.java
@@ -51,10 +51,24 @@ public class ChunkRegionLoader {
return holder.protoChunk;
}
+ // Paper start
+ private static final int CURRENT_DATA_VERSION = SharedConstants.getGameVersion().getWorldVersion();
+ private static final boolean JUST_CORRUPT_IT = Boolean.getBoolean("Paper.ignoreWorldDataVersion");
+ // Paper end
+
public static InProgressChunkHolder loadChunk(WorldServer worldserver, DefinedStructureManager definedstructuremanager, VillagePlace villageplace, ChunkCoordIntPair chunkcoordintpair, NBTTagCompound nbttagcompound, boolean distinguish) {
ArrayDeque<Runnable> tasksToExecuteOnMain = new ArrayDeque<>();
// Paper end
ChunkGenerator chunkgenerator = worldserver.getChunkProvider().getChunkGenerator();
+ // Paper start - Do NOT attempt to load chunks saved with newer versions
+ if (nbttagcompound.hasKeyOfType("DataVersion", 99)) {
+ int dataVersion = nbttagcompound.getInt("DataVersion");
+ if (!JUST_CORRUPT_IT && dataVersion > CURRENT_DATA_VERSION) {
+ new RuntimeException("Server attempted to load chunk saved with newer version of minecraft! " + dataVersion + " > " + CURRENT_DATA_VERSION).printStackTrace();
+ System.exit(1);
+ }
+ }
+ // Paper end
WorldChunkManager worldchunkmanager = chunkgenerator.getWorldChunkManager();
NBTTagCompound nbttagcompound1 = nbttagcompound.getCompound("Level"); // Paper - diff on change, see ChunkRegionLoader#getChunkCoordinate
ChunkCoordIntPair chunkcoordintpair1 = new ChunkCoordIntPair(nbttagcompound1.getInt("xPos"), nbttagcompound1.getInt("zPos")); // Paper - diff on change, see ChunkRegionLoader#getChunkCoordinate
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