PaperMC/patches/server/0450-Thread-Safe-Vanilla-Command-permission-checking.patch
Nassim Jahnke d5f1ffc2e6
Remove somewhat broken patch
With the new chunk system it doesn't hurt too much to (temporarily) remove this until implemented in a safer manner
2022-12-19 11:46:55 +01:00

53 lines
3 KiB
Diff

From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Aikar <aikar@aikar.co>
Date: Sat, 11 Jul 2020 03:54:28 -0400
Subject: [PATCH] Thread Safe Vanilla Command permission checking
Datapacks check this on load and are built concurrently. This was breaking them badly due
to race conditions.
Plus, .canUse we want to be safe for async anyways.
diff --git a/src/main/java/com/mojang/brigadier/tree/CommandNode.java b/src/main/java/com/mojang/brigadier/tree/CommandNode.java
index 20a7cdf87f307878d66922aaac0c60cff218e46c..39844531b03eb8a6c70700b4ecbf0ff1a557424d 100644
--- a/src/main/java/com/mojang/brigadier/tree/CommandNode.java
+++ b/src/main/java/com/mojang/brigadier/tree/CommandNode.java
@@ -75,10 +75,10 @@ public abstract class CommandNode<S> implements Comparable<CommandNode<S>> {
public synchronized boolean canUse(final S source) {
if (source instanceof CommandSourceStack) {
try {
- ((CommandSourceStack) source).currentCommand = this;
+ ((CommandSourceStack) source).currentCommand.put(Thread.currentThread(), this); // Paper
return this.requirement.test(source);
} finally {
- ((CommandSourceStack) source).currentCommand = null;
+ ((CommandSourceStack) source).currentCommand.remove(Thread.currentThread()); // Paper
}
}
// CraftBukkit end
diff --git a/src/main/java/net/minecraft/commands/CommandSourceStack.java b/src/main/java/net/minecraft/commands/CommandSourceStack.java
index b8f5b5895bf75aa8e08b2b0431ef6fdacd235430..c2af60bdb755034e46b85143826a29c4482d58f5 100644
--- a/src/main/java/net/minecraft/commands/CommandSourceStack.java
+++ b/src/main/java/net/minecraft/commands/CommandSourceStack.java
@@ -61,7 +61,7 @@ public class CommandSourceStack implements SharedSuggestionProvider, com.destroy
private final Vec2 rotation;
private final CommandSigningContext signingContext;
private final TaskChainer chatMessageChainer;
- public volatile CommandNode currentCommand; // CraftBukkit
+ public java.util.Map<Thread, CommandNode> currentCommand = new java.util.concurrent.ConcurrentHashMap<>(); // CraftBukkit // Paper
public boolean bypassSelectorPermissions = false; // Paper
public CommandSourceStack(CommandSource output, Vec3 pos, Vec2 rot, ServerLevel world, int level, String name, Component displayName, MinecraftServer server, @Nullable Entity entity) {
@@ -194,9 +194,11 @@ public class CommandSourceStack implements SharedSuggestionProvider, com.destroy
@Override
public boolean hasPermission(int level) {
// CraftBukkit start
- CommandNode currentCommand = this.currentCommand;
+ // Paper start - fix concurrency issue
+ CommandNode currentCommand = this.currentCommand.get(Thread.currentThread());
if (currentCommand != null) {
return this.hasPermission(level, org.bukkit.craftbukkit.command.VanillaCommandWrapper.getPermission(currentCommand));
+ // Paper end
}
// CraftBukkit end