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https://github.com/PaperMC/Paper.git
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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.
79 lines
4.6 KiB
Diff
79 lines
4.6 KiB
Diff
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Jake Potrebic <jake.m.potrebic@gmail.com>
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Date: Tue, 22 Mar 2022 12:44:30 -0700
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Subject: [PATCH] Throw exception on world create while being ticked
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There are no plans to support creating worlds while worlds are
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being ticked themselvess.
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diff --git a/src/main/java/net/minecraft/server/MinecraftServer.java b/src/main/java/net/minecraft/server/MinecraftServer.java
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index 8080eee9babe02660724eee756700a4d5e69014f..ab1f4e62b2ffed99b47ae23cae172f20ed586b27 100644
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--- a/src/main/java/net/minecraft/server/MinecraftServer.java
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+++ b/src/main/java/net/minecraft/server/MinecraftServer.java
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@@ -307,6 +307,7 @@ public abstract class MinecraftServer extends ReentrantBlockableEventLoop<TickTa
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// Spigot end
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public final io.papermc.paper.configuration.PaperConfigurations paperConfigurations; // Paper - add paper configuration files
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public static long currentTickLong = 0L; // Paper - track current tick as a long
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+ public boolean isIteratingOverLevels = false; // Paper - Throw exception on world create while being ticked
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public static <S extends MinecraftServer> S spin(Function<Thread, S> serverFactory) {
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AtomicReference<S> atomicreference = new AtomicReference();
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@@ -1501,7 +1502,7 @@ public abstract class MinecraftServer extends ReentrantBlockableEventLoop<TickTa
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this.getFunctions().tick();
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MinecraftTimings.commandFunctionsTimer.stopTiming(); // Spigot // Paper
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this.profiler.popPush("levels");
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- Iterator iterator = this.getAllLevels().iterator();
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+ //Iterator iterator = this.getAllLevels().iterator(); // Paper - Throw exception on world create while being ticked; moved down
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// CraftBukkit start
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// Run tasks that are waiting on processing
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@@ -1533,6 +1534,8 @@ public abstract class MinecraftServer extends ReentrantBlockableEventLoop<TickTa
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// Paper end - Perf: Optimize time updates
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MinecraftTimings.timeUpdateTimer.stopTiming(); // Spigot // Paper
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+ this.isIteratingOverLevels = true; // Paper - Throw exception on world create while being ticked
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+ Iterator iterator = this.getAllLevels().iterator(); // Paper - Throw exception on world create while being ticked; move down
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while (iterator.hasNext()) {
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ServerLevel worldserver = (ServerLevel) iterator.next();
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worldserver.hasPhysicsEvent = org.bukkit.event.block.BlockPhysicsEvent.getHandlerList().getRegisteredListeners().length > 0; // Paper - BlockPhysicsEvent
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@@ -1571,6 +1574,7 @@ public abstract class MinecraftServer extends ReentrantBlockableEventLoop<TickTa
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this.profiler.pop();
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worldserver.explosionDensityCache.clear(); // Paper - Optimize explosions
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}
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+ this.isIteratingOverLevels = false; // Paper - Throw exception on world create while being ticked
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this.profiler.popPush("connection");
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MinecraftTimings.connectionTimer.startTiming(); // Spigot // Paper
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diff --git a/src/main/java/org/bukkit/craftbukkit/CraftServer.java b/src/main/java/org/bukkit/craftbukkit/CraftServer.java
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index f3b461baac5a5de61f6b1c00251961bd25eb4773..562953515e21adc1cffadfe3ffb803c2d5059df0 100644
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--- a/src/main/java/org/bukkit/craftbukkit/CraftServer.java
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+++ b/src/main/java/org/bukkit/craftbukkit/CraftServer.java
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@@ -886,6 +886,11 @@ public final class CraftServer implements Server {
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return new ArrayList<World>(this.worlds.values());
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}
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+ @Override
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+ public boolean isTickingWorlds() {
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+ return console.isIteratingOverLevels;
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+ }
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+
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public DedicatedPlayerList getHandle() {
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return this.playerList;
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}
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@@ -1145,6 +1150,7 @@ public final class CraftServer implements Server {
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@Override
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public World createWorld(WorldCreator creator) {
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Preconditions.checkState(this.console.getAllLevels().iterator().hasNext(), "Cannot create additional worlds on STARTUP");
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+ //Preconditions.checkState(!this.console.isIteratingOverLevels, "Cannot create a world while worlds are being ticked"); // Paper - Cat - Temp disable. We'll see how this goes.
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Preconditions.checkArgument(creator != null, "WorldCreator cannot be null");
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String name = creator.name();
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@@ -1317,6 +1323,7 @@ public final class CraftServer implements Server {
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@Override
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public boolean unloadWorld(World world, boolean save) {
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+ //Preconditions.checkState(!this.console.isIteratingOverLevels, "Cannot unload a world while worlds are being ticked"); // Paper - Cat - Temp disable. We'll see how this goes.
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if (world == null) {
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return false;
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}
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