Paper/patches/server/0750-Prevent-entity-loading-causing-async-lookups.patch
Owen 89d51d5f29
Allow enabling sand duping (#10191)
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.
2024-03-03 17:05:34 -05:00

75 lines
3.3 KiB
Diff

From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Owen1212055 <23108066+Owen1212055@users.noreply.github.com>
Date: Sun, 6 Mar 2022 11:09:09 -0500
Subject: [PATCH] Prevent entity loading causing async lookups
diff --git a/src/main/java/net/minecraft/world/entity/Entity.java b/src/main/java/net/minecraft/world/entity/Entity.java
index 3d0f7310840742a5b16f0c0a7115dc0c90202919..45712b358e97b65396f63b34c09debc1d42fdbb9 100644
--- a/src/main/java/net/minecraft/world/entity/Entity.java
+++ b/src/main/java/net/minecraft/world/entity/Entity.java
@@ -727,6 +727,7 @@ public abstract class Entity implements Nameable, EntityAccess, CommandSource, S
public void baseTick() {
this.level().getProfiler().push("entityBaseTick");
+ if (firstTick && this instanceof net.minecraft.world.entity.NeutralMob neutralMob) neutralMob.tickInitialPersistentAnger(level); // Paper - Prevent entity loading causing async lookups
this.feetBlockState = null;
if (this.isPassenger() && this.getVehicle().isRemoved()) {
this.stopRiding();
diff --git a/src/main/java/net/minecraft/world/entity/NeutralMob.java b/src/main/java/net/minecraft/world/entity/NeutralMob.java
index fa64c7baa7587f2cfe80b78ed83be011239618cf..47d5a0928f3c86d71f851738bfe7beedc98cfbb3 100644
--- a/src/main/java/net/minecraft/world/entity/NeutralMob.java
+++ b/src/main/java/net/minecraft/world/entity/NeutralMob.java
@@ -42,18 +42,11 @@ public interface NeutralMob {
UUID uuid = nbt.getUUID("AngryAt");
this.setPersistentAngerTarget(uuid);
- Entity entity = ((ServerLevel) world).getEntity(uuid);
-
- if (entity != null) {
- if (entity instanceof Mob) {
- this.setLastHurtByMob((Mob) entity);
- }
-
- if (entity.getType() == EntityType.PLAYER) {
- this.setLastHurtByPlayer((Player) entity);
- }
-
- }
+ // Paper - Prevent entity loading causing async lookups; Moved diff to separate method
+ // If this entity already survived its first tick, e.g. is loaded and ticked in sync, actively
+ // tick the initial persistent anger.
+ // If not, let the first tick on the baseTick call the method later down the line.
+ if (this instanceof Entity entity && !entity.firstTick) this.tickInitialPersistentAnger(world);
}
}
}
@@ -127,4 +120,27 @@ public interface NeutralMob {
@Nullable
LivingEntity getTarget();
+
+ // Paper start - Prevent entity loading causing async lookups
+ // Update last hurt when ticking
+ default void tickInitialPersistentAnger(Level level) {
+ UUID target = getPersistentAngerTarget();
+ if (target == null) {
+ return;
+ }
+
+ Entity entity = ((ServerLevel) level).getEntity(target);
+
+ if (entity != null) {
+ if (entity instanceof Mob) {
+ this.setLastHurtByMob((Mob) entity);
+ }
+
+ if (entity.getType() == EntityType.PLAYER) {
+ this.setLastHurtByPlayer((Player) entity);
+ }
+
+ }
+ }
+ // Paper end - Prevent entity loading causing async lookups
}