Create 0166-Patch-RNG-reuse-that-could-lead-to-coord-exploit-Ran.patch

patches/server/0166-Patch-RNG-reuse-that-could-lead-to-coord-exploit-Ran.patch

@@ -0,0 +1,35 @@
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: Leijurv <[email protected]>
+Date: Tue, 16 Apr 2024 19:43:08 -0700
+Subject: [PATCH] Patch RNG reuse that could lead to coord exploit (Randar)
+
+Credits: Leijurv (From https://github.com/spawnmason/randar-explanation/blob/master/media/0386-Patch-RNG-reuse-that-could-lead-to-coord-exploit-Ran.patch)
+
+diff --git src/main/java/net/minecraft/server/World.java src/main/java/net/minecraft/server/World.java
+index cc9f467cc85704d536545aa63985340013e63703..a6e97eb3b57e65abf4399acbec9393bcab1ee2b9 100644
+--- src/main/java/net/minecraft/server/World.java
++++ 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();
++    // Dionysus start
++    private final Random separateRandOnlyForWorldGen = new Random();
++    // Dionysus end
+     public WorldProvider worldProvider;
+     protected NavigationListener t = new NavigationListener();
+     protected List<IWorldAccess> u;
+@@ -3224,9 +3227,10 @@ 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;
++        // Dionysus start
++        this.separateRandOnlyForWorldGen.setSeed(l);
++        return this.separateRandOnlyForWorldGen;
++        // Dionysus end
+     }
+
+     public CrashReportSystemDetails a(CrashReport crashreport) {