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https://github.com/PaperMC/Paper.git
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01a13871de
Patch documentation to come Issues with the old system that are fixed now: - World generation does not scale with cpu cores effectively. - Relies on the main thread for scheduling and maintaining chunk state, dropping chunk load/generate rates at lower tps. - Unreliable prioritisation of chunk gen/load calls that block the main thread. - Shutdown logic is utterly unreliable, as it has to wait for all chunks to unload - is it guaranteed that the chunk system is in a state on shutdown that it can reliably do this? Watchdog shutdown also typically failed due to thread checks, which is now resolved. - Saving of data is not unified (i.e can save chunk data without saving entity data, poses problems for desync if shutdown is really abnormal. - Entities are not loaded with chunks. This caused quite a bit of headache for Chunk#getEntities API, but now the new chunk system loads entities with chunks so that they are ready whenever the chunk loads in. Effectively brings the behavior back to 1.16 era, but still storing entities in their own separate regionfiles. The above list is not complete. The patch documentation will complete it. New chunk system hard relies on starlight and dataconverter, and most importantly the new concurrent utilities in ConcurrentUtil. Some of the old async chunk i/o interface (i.e the old file io thread reroutes _some_ calls to the new file io thread) is kept for plugin compat reasons. It will be removed in the next major version of minecraft. The old legacy chunk system patches have been moved to the removed folder in case we need them again.
87 lines
4.6 KiB
Diff
87 lines
4.6 KiB
Diff
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Nassim Jahnke <nassim@njahnke.dev>
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Date: Wed, 1 Dec 2021 12:36:25 +0100
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Subject: [PATCH] Prevent sending oversized item data in equipment and metadata
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diff --git a/src/main/java/net/minecraft/network/syncher/EntityDataSerializers.java b/src/main/java/net/minecraft/network/syncher/EntityDataSerializers.java
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index 0c79613597e9ed1fbeeb36e9cb60a70bbda17bb9..79593d42ef881aa96eab7ea1e50683fa48ff4896 100644
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--- a/src/main/java/net/minecraft/network/syncher/EntityDataSerializers.java
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+++ b/src/main/java/net/minecraft/network/syncher/EntityDataSerializers.java
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@@ -38,7 +38,7 @@ public class EntityDataSerializers {
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public static final EntityDataSerializer<ItemStack> ITEM_STACK = new EntityDataSerializer<ItemStack>() {
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@Override
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public void write(FriendlyByteBuf buf, ItemStack value) {
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- buf.writeItem(value);
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+ buf.writeItem(net.minecraft.world.entity.LivingEntity.sanitizeItemStack(value, false)); // Paper - prevent oversized data
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}
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@Override
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diff --git a/src/main/java/net/minecraft/server/level/ServerEntity.java b/src/main/java/net/minecraft/server/level/ServerEntity.java
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index cc418554b655ea4111631e4a1abf69776e150e7c..319dfa82dff1fe188a52bed5aa2d39575853b793 100644
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--- a/src/main/java/net/minecraft/server/level/ServerEntity.java
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+++ b/src/main/java/net/minecraft/server/level/ServerEntity.java
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@@ -309,7 +309,10 @@ public class ServerEntity {
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ItemStack itemstack = ((LivingEntity) this.entity).getItemBySlot(enumitemslot);
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if (!itemstack.isEmpty()) {
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- list.add(Pair.of(enumitemslot, itemstack.copy()));
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+ // Paper start - prevent oversized data
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+ final ItemStack sanitized = LivingEntity.sanitizeItemStack(itemstack.copy(), false);
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+ list.add(Pair.of(enumitemslot, sanitized));
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+ // Paper end
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}
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}
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diff --git a/src/main/java/net/minecraft/world/entity/LivingEntity.java b/src/main/java/net/minecraft/world/entity/LivingEntity.java
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index 8ac7d25e6e1a22829d6c45522409763bbb1328a0..e7560eb298b563231407de832a81bb2c97e3c4cf 100644
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--- a/src/main/java/net/minecraft/world/entity/LivingEntity.java
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+++ b/src/main/java/net/minecraft/world/entity/LivingEntity.java
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@@ -3134,7 +3134,10 @@ public abstract class LivingEntity extends Entity {
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equipmentChanges.forEach((enumitemslot, itemstack) -> {
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ItemStack itemstack1 = itemstack.copy();
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- list.add(Pair.of(enumitemslot, itemstack1));
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+ // Paper start - prevent oversized data
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+ ItemStack toSend = sanitizeItemStack(itemstack1, true);
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+ list.add(Pair.of(enumitemslot, toSend));
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+ // Paper end
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switch (enumitemslot.getType()) {
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case HAND:
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this.setLastHandItem(enumitemslot, itemstack1);
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@@ -3147,6 +3150,34 @@ public abstract class LivingEntity extends Entity {
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((ServerLevel) this.level).getChunkSource().broadcast(this, new ClientboundSetEquipmentPacket(this.getId(), list));
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}
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+ // Paper start - prevent oversized data
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+ public static ItemStack sanitizeItemStack(final ItemStack itemStack, final boolean copyItemStack) {
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+ if (itemStack.isEmpty() || !itemStack.hasTag()) {
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+ return itemStack;
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+ }
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+
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+ final ItemStack copy = copyItemStack ? itemStack.copy() : itemStack;
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+ final CompoundTag tag = copy.getTag();
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+ if (copy.is(Items.BUNDLE) && tag.get("Items") instanceof ListTag oldItems && !oldItems.isEmpty()) {
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+ // Bundles change their texture based on their fullness.
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+ org.bukkit.inventory.meta.BundleMeta bundleMeta = (org.bukkit.inventory.meta.BundleMeta) copy.asBukkitMirror().getItemMeta();
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+ int sizeUsed = 0;
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+ for (org.bukkit.inventory.ItemStack item : bundleMeta.getItems()) {
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+ int scale = 64 / item.getMaxStackSize();
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+ sizeUsed += scale * item.getAmount();
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+ }
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+ // Now we add a single fake item that uses the same amount of slots as all other items.
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+ ListTag items = new ListTag();
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+ items.add(new ItemStack(Items.PAPER, sizeUsed).save(new CompoundTag()));
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+ tag.put("Items", items);
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+ }
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+ if (tag.get("BlockEntityTag") instanceof CompoundTag blockEntityTag) {
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+ blockEntityTag.remove("Items");
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+ }
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+ return copy;
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+ }
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+ // Paper end
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+
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private ItemStack getLastArmorItem(EquipmentSlot slot) {
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return (ItemStack) this.lastArmorItemStacks.get(slot.getIndex());
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}
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