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Strengthen entity list guard patch back up to its original level. Whilst upstream fixes attempt to fix this, they aren't fully functional and can cause the server to crash. This way we can both identify bad plugins and stop all crashes.

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This commit is contained in:
md_5 2014-03-10 09:04:25 +11:00
parent 6ed812be08
commit 71fce21cdd
2 changed files with 95 additions and 28 deletions
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79
CraftBukkit-Patches/0115-Guard-Entity-List.patch Normal file
View file

@ -0,0 +1,79 @@
From 71dc389b977238a15bb2a1aa44670aa12a6513a6 Mon Sep 17 00:00:00 2001
From: md_5 <git@md-5.net>
Date: Mon, 10 Mar 2014 09:03:28 +1100
Subject: [PATCH] Guard Entity List
diff --git a/src/main/java/net/minecraft/server/World.java b/src/main/java/net/minecraft/server/World.java
index 6ec7f5a..d0d9ea9 100644
--- a/src/main/java/net/minecraft/server/World.java
+++ b/src/main/java/net/minecraft/server/World.java
@@ -29,7 +29,32 @@ import org.bukkit.event.weather.ThunderChangeEvent;
public abstract class World implements IBlockAccess {
public boolean d;
- public List entityList = new ArrayList();
+ // Spigot start - guard entity list from removals
+ public List entityList = new ArrayList()
+ {
+ @Override
+ public Object remove(int index)
+ {
+ guard();
+ return super.remove( index );
+ }
+
+ @Override
+ public boolean remove(Object o)
+ {
+ guard();
+ return super.remove( o );
+ }
+
+ private void guard()
+ {
+ if ( guardEntityList )
+ {
+ throw new java.util.ConcurrentModificationException();
+ }
+ }
+ };
+ // Spigot end
protected List f = new ArrayList();
public Set tileEntityList = new HashSet(); // CraftBukkit - ArrayList -> HashSet
private List a = new ArrayList();
@@ -78,6 +103,7 @@ public abstract class World implements IBlockAccess {
int[] I;
// Spigot start
+ private boolean guardEntityList;
protected final gnu.trove.map.hash.TLongShortHashMap chunkTickList;
protected float growthOdds = 100;
protected float modifiedOdds = 100;
@@ -1272,6 +1298,7 @@ public abstract class World implements IBlockAccess {
org.spigotmc.ActivationRange.activateEntities(this); // Spigot
timings.entityTick.startTiming(); // Spigot
+ guardEntityList = true; // Spigot
// CraftBukkit start - Use field for loop variable
for (this.tickPosition = 0; this.tickPosition < this.entityList.size(); ++this.tickPosition) {
entity = (Entity) this.entityList.get(this.tickPosition);
@@ -1320,12 +1347,15 @@ public abstract class World implements IBlockAccess {
this.getChunkAt(j, k).b(entity);
}
+ guardEntityList = false; // Spigot
this.entityList.remove(this.tickPosition--); // CraftBukkit - Use field for loop variable
+ guardEntityList = true; // Spigot
this.b(entity);
}
this.methodProfiler.b();
}
+ guardEntityList = false; // Spigot
timings.entityTick.stopTiming(); // Spigot
this.methodProfiler.c("blockEntities");
--
1.8.3.2

44
CraftBukkit-Patches/0115-Guard-entity-list.patch
View file

@ -8,7 +8,7 @@ diff --git a/src/main/java/net/minecraft/server/World.java b/src/main/java/net/m
index 6ec7f5a..9bc4256 100644
--- a/src/main/java/net/minecraft/server/World.java
+++ b/src/main/java/net/minecraft/server/World.java
@@ -29,7 +29,25 @@ import org.bukkit.event.weather.ThunderChangeEvent;
@@ -29,7 +29,25 @@ import java.util.concurrent.Callable;
public abstract class World implements IBlockAccess {
public boolean d;
@ -35,51 +35,39 @@ index 6ec7f5a..9bc4256 100644
protected List f = new ArrayList();
public Set tileEntityList = new HashSet(); // CraftBukkit - ArrayList -> HashSet
private List a = new ArrayList();
@@ -78,6 +96,7 @@ public abstract class World implements IBlockAccess {
int[] I;
@@ -74,6 +92,7 @@ public abstract class World implements IBlockAccess {
int[] H;
public boolean isStatic;
// Spigot start
+ private boolean guardEntityList = false;
+ private boolean guardEntityList;
protected final gnu.trove.map.hash.TLongShortHashMap chunkTickList;
protected float growthOdds = 100;
protected float modifiedOdds = 100;
@@ -1033,7 +1052,12 @@ public abstract class World implements IBlockAccess {
if (index <= this.tickPosition) {
this.tickPosition--;
}
+ // Spigot start
+ boolean isGuarding = guardEntityList;
+ guardEntityList = false;
this.entityList.remove(index);
+ guardEntityList = isGuarding;
+ // Spigot end
}
// CraftBukkit end
@@ -1272,6 +1296,7 @@ public abstract class World implements IBlockAccess {
@@ -1285,6 +1304,7 @@ public abstract class World implements IBlockAccess {
org.spigotmc.ActivationRange.activateEntities(this); // Spigot
timings.entityTick.startTiming(); // Spigot
+ guardEntityList = true; // Spigot
// CraftBukkit start - Use field for loop variable
for (this.tickPosition = 0; this.tickPosition < this.entityList.size(); ++this.tickPosition) {
entity = (Entity) this.entityList.get(this.tickPosition);
@@ -1320,12 +1345,15 @@ public abstract class World implements IBlockAccess {
for (i = 0; i < this.entityList.size(); ++i) {
entity = (Entity) this.entityList.get(i);
@@ -1331,14 +1351,16 @@ public abstract class World implements IBlockAccess {
if (entity.ai && this.isChunkLoaded(j, k)) {
this.getChunkAt(j, k).b(entity);
}
-
+ guardEntityList = false; // Spigot
this.entityList.remove(this.tickPosition--); // CraftBukkit - Use field for loop variable
this.entityList.remove(i--);
+ guardEntityList = true; // Spigot
this.b(entity);
}
this.methodProfiler.b();
}
lastChunk = Long.MIN_VALUE; // Spigot
+ guardEntityList = false; // Spigot
timings.entityTick.stopTiming(); // Spigot
this.methodProfiler.c("blockEntities");
this.methodProfiler.c("tileEntities");
--
1.8.3.2
1.8.1.msysgit.1