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Paper/patches/server/0503-Do-not-let-the-server-load-chunks-from-newer-version.patch

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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If the server attempts to load a chunk generated by a newer version of
the game, immediately stop the server to prevent data corruption.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/world/level/chunk/storage/ChunkSerializer.java b/src/main/java/net/minecraft/world/level/chunk/storage/ChunkSerializer.java
index ed05a11f5038fdac90576ca33a0b710c83ab39a1..80b9f3547bc30cb470d272132e96fcce188efd91 100644
--- a/src/main/java/net/minecraft/world/level/chunk/storage/ChunkSerializer.java
+++ b/src/main/java/net/minecraft/world/level/chunk/storage/ChunkSerializer.java
@@ -96,10 +96,25 @@ public class ChunkSerializer {
holder.tasks.forEach(Runnable::run);
return holder.protoChunk;
}
+
+ // Paper start
+ private static final int CURRENT_DATA_VERSION = SharedConstants.getCurrentVersion().getWorldVersion();
+ private static final boolean JUST_CORRUPT_IT = Boolean.getBoolean("Paper.ignoreWorldDataVersion");
+ // Paper end
+
public static InProgressChunkHolder loadChunk(ServerLevel world, StructureManager structureManager, PoiManager poiStorage, ChunkPos pos, CompoundTag nbt, boolean distinguish) {
java.util.ArrayDeque<Runnable> tasksToExecuteOnMain = new java.util.ArrayDeque<>();
// Paper end
ChunkGenerator chunkgenerator = world.getChunkSource().getGenerator();
+ // Paper start - Do NOT attempt to load chunks saved with newer versions
+ if (nbt.contains("DataVersion", 99)) {
+ int dataVersion = nbt.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
BiomeSource worldchunkmanager = chunkgenerator.getBiomeSource();
CompoundTag nbttagcompound1 = nbt.getCompound("Level"); // Paper - diff on change, see ChunkSerializer#getChunkCoordinate
ChunkPos chunkcoordintpair1 = new ChunkPos(nbttagcompound1.getInt("xPos"), nbttagcompound1.getInt("zPos")); // Paper - diff on change, see ChunkSerializer#getChunkCoordinate