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89d51d5f29
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.
41 lines
2.6 KiB
Diff
41 lines
2.6 KiB
Diff
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Zach Brown <zach@zachbr.io>
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Date: Tue, 23 Jul 2019 20:44:47 -0500
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Subject: [PATCH] Do not let the server load chunks from newer versions
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If the server attempts to load a chunk generated by a newer version of
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the game, immediately stop the server to prevent data corruption.
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You can override this functionality at your own peril.
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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
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index cbc8e95c8f890f0c0eb717d4d2ae3f427dc260d8..3b046dc106b96b7ca2b148d605e8b7c97453d033 100644
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--- a/src/main/java/net/minecraft/world/level/chunk/storage/ChunkSerializer.java
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+++ b/src/main/java/net/minecraft/world/level/chunk/storage/ChunkSerializer.java
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@@ -84,6 +84,10 @@ public class ChunkSerializer {
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public static final String BLOCK_LIGHT_TAG = "BlockLight";
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public static final String SKY_LIGHT_TAG = "SkyLight";
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+ // Paper start - Do not let the server load chunks from newer versions
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+ private static final int CURRENT_DATA_VERSION = net.minecraft.SharedConstants.getCurrentVersion().getDataVersion().getVersion();
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+ private static final boolean JUST_CORRUPT_IT = Boolean.getBoolean("Paper.ignoreWorldDataVersion");
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+ // Paper end - Do not let the server load chunks from newer versions
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public ChunkSerializer() {}
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// Paper start - guard against serializing mismatching coordinates
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@@ -99,6 +103,15 @@ public class ChunkSerializer {
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}
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// Paper end - guard against serializing mismatching coordinates
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public static ProtoChunk read(ServerLevel world, PoiManager poiStorage, ChunkPos chunkPos, CompoundTag nbt) {
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+ // Paper start - Do not let the server load chunks from newer versions
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+ if (nbt.contains("DataVersion", net.minecraft.nbt.Tag.TAG_ANY_NUMERIC)) {
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+ final int dataVersion = nbt.getInt("DataVersion");
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+ if (!JUST_CORRUPT_IT && dataVersion > CURRENT_DATA_VERSION) {
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+ new RuntimeException("Server attempted to load chunk saved with newer version of minecraft! " + dataVersion + " > " + CURRENT_DATA_VERSION).printStackTrace();
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+ System.exit(1);
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+ }
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+ }
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+ // Paper end - Do not let the server load chunks from newer versions
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ChunkPos chunkcoordintpair1 = new ChunkPos(nbt.getInt("xPos"), nbt.getInt("zPos")); // Paper - guard against serializing mismatching coordinates; diff on change, see ChunkSerializer#getChunkCoordinate
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if (!Objects.equals(chunkPos, chunkcoordintpair1)) {
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