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c5a10665b8
Spigot still maintains some partial implementation of "tick skipping", a practice in which the MinecraftServer.currentTick field is updated not by an increment of one per actual tick, but instead set to System.currentTimeMillis() / 50. This behaviour means that the tracked tick may "skip" a tick value in case a previous tick took more than the expected 50ms. To compensate for this in important paths, spigot/craftbukkit implements "wall-time". Instead of incrementing/decrementing ticks on block entities/entities by one for each call to their tick() method, they instead increment/decrement important values, like an ItemEntity's age or pickupDelay, by the difference of `currentTick - lastTick`, where `lastTick` is the value of `currentTick` during the last tick() call. These "fixes" however do not play nicely with minecraft's simulation distance as entities/block entities implementing the above behaviour would "catch up" their values when moving from a non-ticking chunk to a ticking one as their `lastTick` value remains stuck on the last tick in a ticking chunk and hence lead to a large "catch up" once ticked again. Paper completely removes the "tick skipping" behaviour (See patch "Further-improve-server-tick-loop"), making the above precautions completely unnecessary, which also rids paper of the previous described incompatibility with non-ticking chunks.
25 lines
1.5 KiB
Diff
25 lines
1.5 KiB
Diff
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Jason Penilla <11360596+jpenilla@users.noreply.github.com>
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Date: Mon, 11 Jan 2021 12:43:51 -0800
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Subject: [PATCH] Fix villager boat exploit
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diff --git a/src/main/java/net/minecraft/server/players/PlayerList.java b/src/main/java/net/minecraft/server/players/PlayerList.java
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index 98eb00a8ee23543714d424d3ff5ca19887d6db19..9436a9614dea81d14c4f77cc21ca91f85ca87152 100644
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--- a/src/main/java/net/minecraft/server/players/PlayerList.java
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+++ b/src/main/java/net/minecraft/server/players/PlayerList.java
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@@ -595,6 +595,14 @@ public abstract class PlayerList {
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PlayerList.LOGGER.debug("Removing player mount");
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entityplayer.stopRiding();
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entity.getPassengersAndSelf().forEach((entity1) -> {
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+ // Paper start - Fix villager boat exploit
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+ if (entity1 instanceof net.minecraft.world.entity.npc.AbstractVillager villager) {
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+ final net.minecraft.world.entity.player.Player human = villager.getTradingPlayer();
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+ if (human != null) {
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+ villager.setTradingPlayer(null);
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+ }
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+ }
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+ // Paper end - Fix villager boat exploit
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entity1.setRemoved(Entity.RemovalReason.UNLOADED_WITH_PLAYER, EntityRemoveEvent.Cause.PLAYER_QUIT); // CraftBukkit - add Bukkit remove cause
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});
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}
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