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Allow enabling sand duping (#10191)

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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.
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Owen 2024-03-03 17:05:34 -05:00 • committed by GitHub
parent b21eb4d9a4
commit 89d51d5f29
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GPG key ID: B5690EEEBB952194
673 changed files with 157 additions and 189 deletions
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35
patches/server/0410-Optimize-NetworkManager-Exception-Handling.patch
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@ -1,35 +0,0 @@
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Andrew Steinborn <git@steinborn.me>
Date: Sun, 5 Jul 2020 22:38:18 -0400
Subject: [PATCH] Optimize NetworkManager Exception Handling
diff --git a/src/main/java/net/minecraft/network/ConnectionProtocol.java b/src/main/java/net/minecraft/network/ConnectionProtocol.java
index ac1aa37329bd4d411964ea34ea8147f6db945b9a..0ed8d5691a5562a944b68f385b97ef814c2380e1 100644
--- a/src/main/java/net/minecraft/network/ConnectionProtocol.java
+++ b/src/main/java/net/minecraft/network/ConnectionProtocol.java
@@ -341,6 +341,7 @@ public enum ConnectionProtocol {
@Nullable
public Packet<?> createPacket(int id, FriendlyByteBuf buf) {
+ if (id < 0 || id >= this.idToDeserializer.size()) return null; // Paper - Perf: Optimize exception handling
Function<FriendlyByteBuf, ? extends Packet<? super T>> function = this.idToDeserializer.get(id);
return function != null ? function.apply(buf) : null;
}
diff --git a/src/main/java/net/minecraft/network/Varint21FrameDecoder.java b/src/main/java/net/minecraft/network/Varint21FrameDecoder.java
index 00c170a16a57f41f881c6b282cba474ce485b34c..137b9a088c82ce6813bf8a80468675bb4992ce53 100644
--- a/src/main/java/net/minecraft/network/Varint21FrameDecoder.java
+++ b/src/main/java/net/minecraft/network/Varint21FrameDecoder.java
@@ -39,6 +39,12 @@ public class Varint21FrameDecoder extends ByteToMessageDecoder {
}
protected void decode(ChannelHandlerContext channelHandlerContext, ByteBuf byteBuf, List<Object> list) {
+ // Paper start - Perf: Optimize exception handling; if channel is not active just discard the packet
+ if (!channelHandlerContext.channel().isActive()) {
+ byteBuf.skipBytes(byteBuf.readableBytes());
+ return;
+ }
+ // Paper end - Perf: Optimize exception handling
byteBuf.markReaderIndex();
this.helperBuf.clear();
if (!copyVarint(byteBuf, this.helperBuf)) {