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Use thread safe Random inside of ServerLoginPacketListenerImpl

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Vanilla uses a Random instance which is not thread safe inside of the
constructor for ServerLoginPacketListenerImpl, this is an issue because
instances of that class are created on the network worker threads, which
means that there is a potential (which we have reports confirming) that
multiple users logging on could trip this
This commit is contained in:
Shane Freeder 2022-08-11 14:38:45 +01:00
parent 7e11afa426
commit 3f0415b453
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1 changed files with 19 additions and 0 deletions
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patches/server/0933-Use-thread-safe-random-in-ServerLoginPacketListenerI.patch Normal file
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From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Shane Freeder <theboyetronic@gmail.com>
Date: Thu, 11 Aug 2022 14:37:33 +0100
Subject: [PATCH] Use thread safe random in ServerLoginPacketListenerImpl
diff --git a/src/main/java/net/minecraft/server/network/ServerLoginPacketListenerImpl.java b/src/main/java/net/minecraft/server/network/ServerLoginPacketListenerImpl.java
index bf488013e45b9ab97568e587f4dad899498b2f73..88a849a21d6e39fd70f6e7b554528da1a5a7dd57 100644
--- a/src/main/java/net/minecraft/server/network/ServerLoginPacketListenerImpl.java
+++ b/src/main/java/net/minecraft/server/network/ServerLoginPacketListenerImpl.java
@@ -52,7 +52,7 @@ public class ServerLoginPacketListenerImpl implements TickablePacketListener, Se
private static final AtomicInteger UNIQUE_THREAD_ID = new AtomicInteger(0);
static final Logger LOGGER = LogUtils.getLogger();
private static final int MAX_TICKS_BEFORE_LOGIN = 600;
- private static final RandomSource RANDOM = RandomSource.create();
+ private static final RandomSource RANDOM = new org.bukkit.craftbukkit.util.RandomSourceWrapper(new java.util.Random()); // Paper - This is called across threads, make safe
private final byte[] nonce;
final MinecraftServer server;
public final Connection connection;