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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.
51 lines
3.2 KiB
Diff
51 lines
3.2 KiB
Diff
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Spottedleaf <Spottedleaf@users.noreply.github.com>
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Date: Sun, 18 Jun 2023 23:04:46 -0700
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Subject: [PATCH] Do not read tile entities in chunks that are positioned
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outside of the chunk
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The tile entities are not accessible and so should not be loaded.
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This can happen as a result of users moving regionfiles around,
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which would cause a crash on Folia but would appear to function
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fine on Paper.
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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 3b046dc106b96b7ca2b148d605e8b7c97453d033..85de64c1e75e1323f8425fc53e525c215ff417ce 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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@@ -307,6 +307,13 @@ public class ChunkSerializer {
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for (int k1 = 0; k1 < nbttaglist3.size(); ++k1) {
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CompoundTag nbttagcompound4 = nbttaglist3.getCompound(k1);
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+ // Paper start - do not read tile entities positioned outside the chunk
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+ BlockPos blockposition = BlockEntity.getPosFromTag(nbttagcompound4);
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+ if ((blockposition.getX() >> 4) != chunkPos.x || (blockposition.getZ() >> 4) != chunkPos.z) {
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+ LOGGER.warn("Tile entity serialized in chunk " + chunkPos + " in world '" + world.getWorld().getName() + "' positioned at " + blockposition + " is located outside of the chunk");
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+ continue;
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+ }
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+ // Paper end - do not read tile entities positioned outside the chunk
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((ChunkAccess) object1).setBlockEntityNbt(nbttagcompound4);
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}
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@@ -517,10 +524,19 @@ public class ChunkSerializer {
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CompoundTag nbttagcompound1 = nbttaglist1.getCompound(i);
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boolean flag = nbttagcompound1.getBoolean("keepPacked");
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+ // Paper start - do not read tile entities positioned outside the chunk
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+ BlockPos blockposition = BlockEntity.getPosFromTag(nbttagcompound1); // moved up
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+ ChunkPos chunkPos = chunk.getPos();
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+ if ((blockposition.getX() >> 4) != chunkPos.x || (blockposition.getZ() >> 4) != chunkPos.z) {
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+ LOGGER.warn("Tile entity serialized in chunk " + chunkPos + " in world '" + world.getWorld().getName() + "' positioned at " + blockposition + " is located outside of the chunk");
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+ continue;
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+ }
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+ // Paper end - do not read tile entities positioned outside the chunk
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+
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if (flag) {
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chunk.setBlockEntityNbt(nbttagcompound1);
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} else {
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- BlockPos blockposition = BlockEntity.getPosFromTag(nbttagcompound1);
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+ // Paper - do not read tile entities positioned outside the chunk; move up
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BlockEntity tileentity = BlockEntity.loadStatic(blockposition, chunk.getBlockState(blockposition), nbttagcompound1);
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if (tileentity != null) {
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