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Allow enabling sand duping (#10191)

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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.
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Owen 2024-03-03 17:05:34 -05:00 • committed by GitHub
parent b21eb4d9a4
commit 89d51d5f29
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673 changed files with 157 additions and 189 deletions
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patches/server/0672-Fix-ChunkSnapshot-isSectionEmpty-int-and-optimize-Pa.patch Normal file
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@ -0,0 +1,43 @@
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Jason Penilla <11360596+jpenilla@users.noreply.github.com>
Date: Thu, 9 Dec 2021 00:08:11 -0800
Subject: [PATCH] Fix ChunkSnapshot#isSectionEmpty(int) and optimize
PalettedContainer copying by not using codecs
diff --git a/src/main/java/org/bukkit/craftbukkit/CraftChunk.java b/src/main/java/org/bukkit/craftbukkit/CraftChunk.java
index bfde7573acb6d84accfd3f7fee877bbfb3b0852f..260ca4a9c170567b27488466f802c91212997f91 100644
--- a/src/main/java/org/bukkit/craftbukkit/CraftChunk.java
+++ b/src/main/java/org/bukkit/craftbukkit/CraftChunk.java
@@ -337,13 +337,17 @@ public class CraftChunk implements Chunk {
PalettedContainerRO<Holder<net.minecraft.world.level.biome.Biome>>[] biome = (includeBiome || includeBiomeTempRain) ? new PalettedContainer[cs.length] : null;
Registry<net.minecraft.world.level.biome.Biome> iregistry = this.worldServer.registryAccess().registryOrThrow(Registries.BIOME);
- Codec<PalettedContainerRO<Holder<net.minecraft.world.level.biome.Biome>>> biomeCodec = PalettedContainer.codecRO(iregistry.asHolderIdMap(), iregistry.holderByNameCodec(), PalettedContainer.Strategy.SECTION_BIOMES, iregistry.getHolderOrThrow(Biomes.PLAINS));
for (int i = 0; i < cs.length; i++) {
- CompoundTag data = new CompoundTag();
- data.put("block_states", ChunkSerializer.BLOCK_STATE_CODEC.encodeStart(NbtOps.INSTANCE, cs[i].getStates()).get().left().get());
- sectionBlockIDs[i] = ChunkSerializer.BLOCK_STATE_CODEC.parse(NbtOps.INSTANCE, data.getCompound("block_states")).get().left().get();
+ // Paper start - Fix ChunkSnapshot#isSectionEmpty(int); and remove codec usage
+ sectionEmpty[i] = cs[i].hasOnlyAir(); // fix sectionEmpty array not being filled
+ if (!sectionEmpty[i]) {
+ sectionBlockIDs[i] = cs[i].getStates().copy(); // use copy instead of round tripping with codecs
+ } else {
+ sectionBlockIDs[i] = CraftChunk.emptyBlockIDs; // use cached instance for empty block sections
+ }
+ // Paper end - Fix ChunkSnapshot#isSectionEmpty(int)
LevelLightEngine lightengine = this.worldServer.getLightEngine();
DataLayer skyLightArray = lightengine.getLayerListener(LightLayer.SKY).getDataLayerData(SectionPos.of(this.x, chunk.getSectionYFromSectionIndex(i), this.z)); // SPIGOT-7498: Convert section index
@@ -362,8 +366,7 @@ public class CraftChunk implements Chunk {
}
if (biome != null) {
- data.put("biomes", biomeCodec.encodeStart(NbtOps.INSTANCE, cs[i].getBiomes()).get().left().get());
- biome[i] = biomeCodec.parse(NbtOps.INSTANCE, data.getCompound("biomes")).get().left().get();
+ biome[i] = ((PalettedContainer<Holder<net.minecraft.world.level.biome.Biome>>) cs[i].getBiomes()).copy(); // Paper - Perf: use copy instead of round tripping with codecs
}
}