0386-Patch-RNG-reuse-that-could-lead-to-coord-exploit-Ran.patch

From eb0276ce90794a32825d71108f69f412268c6263 Mon Sep 17 00:00:00 2001
From: Leijurv <leijurv@gmail.com>
Date: Tue, 16 Apr 2024 19:43:08 -0700
Subject: [PATCH] Patch RNG reuse that could lead to coord exploit (Randar)


diff --git a/src/main/java/net/minecraft/server/World.java b/src/main/java/net/minecraft/server/World.java
index bc231c7f2..92c3e25f0 100644
--- a/src/main/java/net/minecraft/server/World.java
+++ b/src/main/java/net/minecraft/server/World.java
@@ -89,6 +89,9 @@ public abstract class World implements IBlockAccess {
     protected float q;
     private int M;
     public final Random random = new Random();
+    // Paper start
+    private final Random separateRandOnlyForWorldGen = new Random();
+    // Paper end
     public WorldProvider worldProvider;
     protected NavigationListener t = new NavigationListener();
     protected List<IWorldAccess> u;
@@ -3167,9 +3170,10 @@ public abstract class World implements IBlockAccess {
 
     public Random a(int i, int j, int k) {
         long l = (long) i * 341873128712L + (long) j * 132897987541L + this.getWorldData().getSeed() + (long) k;
-
-        this.random.setSeed(l);
-        return this.random;
+        // Paper start
+        this.separateRandOnlyForWorldGen.setSeed(l);
+        return this.separateRandOnlyForWorldGen;
+        // Paper end
     }
 
     public CrashReportSystemDetails a(CrashReport crashreport) {
-- 
2.37.0 (Apple Git-136)