PaperMC/Spigot-Server-Patches/0054-Add-velocity-warnings.patch
Aikar b62dfa0bf9
Updated Upstream (Bukkit/CraftBukkit)
Upstream has released updates that appears to apply and compile correctly.
This update has not been tested by PaperMC and as with ANY update, please do your own testing

Bukkit Changes:
39ce5d3a SPIGOT-4399: ItemMeta.equals broken with AttributeModifiers

CraftBukkit Changes:
1cf8b5dc SPIGOT-4400: Populators running on existing chunks
116cb9a1 SPIGOT-4399: Add attribute modifier equality test
5ee1c18a SPIGOT-4398: Set ASM7_EXPERIMENTAL flag
2018-09-28 19:31:59 -04:00

95 lines
4.7 KiB
Diff

From 901aeed4b57279cd6901464e6643049fc57e2a5f Mon Sep 17 00:00:00 2001
From: Joseph Hirschfeld <joe@ibj.io>
Date: Thu, 3 Mar 2016 02:48:12 -0600
Subject: [PATCH] Add velocity warnings
diff --git a/src/main/java/org/bukkit/craftbukkit/CraftServer.java b/src/main/java/org/bukkit/craftbukkit/CraftServer.java
index 267224c69c..17fdc58bd0 100644
--- a/src/main/java/org/bukkit/craftbukkit/CraftServer.java
+++ b/src/main/java/org/bukkit/craftbukkit/CraftServer.java
@@ -196,6 +196,7 @@ public final class CraftServer implements Server {
public boolean ignoreVanillaPermissions = false;
private final List<CraftPlayer> playerView;
public int reloadCount;
+ public static Exception excessiveVelEx; // Paper - Velocity warnings
private final class BooleanWrapper {
private boolean value = true;
diff --git a/src/main/java/org/bukkit/craftbukkit/entity/CraftEntity.java b/src/main/java/org/bukkit/craftbukkit/entity/CraftEntity.java
index 0c9b7276fc..ae705e86f9 100644
--- a/src/main/java/org/bukkit/craftbukkit/entity/CraftEntity.java
+++ b/src/main/java/org/bukkit/craftbukkit/entity/CraftEntity.java
@@ -264,12 +264,44 @@ public abstract class CraftEntity implements org.bukkit.entity.Entity {
public void setVelocity(Vector velocity) {
Preconditions.checkArgument(velocity != null, "velocity");
velocity.checkFinite();
+
+ // Paper start - Warn server owners when plugins try to set super high velocities
+ if (!(this instanceof org.bukkit.entity.Projectile) && isUnsafeVelocity(velocity)) {
+ CraftServer.excessiveVelEx = new Exception("Excessive velocity set detected: tried to set velocity of entity " + entity.getName() + " id #" + getEntityId() + " to (" + velocity.getX() + "," + velocity.getY() + "," + velocity.getZ() + ").");
+ }
+ // Paper end
+
entity.motX = velocity.getX();
entity.motY = velocity.getY();
entity.motZ = velocity.getZ();
entity.velocityChanged = true;
}
+ // Paper start
+ /**
+ * Checks if the given velocity is not necessarily safe in all situations.
+ * This function returning true does not mean the velocity is dangerous or to be avoided, only that it may be
+ * a detriment to performance on the server.
+ *
+ * It is not to be used as a hard rule of any sort.
+ * Paper only uses it to warn server owners in watchdog crashes.
+ *
+ * @param vel incoming velocity to check
+ * @return if the velocity has the potential to be a performance detriment
+ */
+ private static boolean isUnsafeVelocity(Vector vel) {
+ final double x = vel.getX();
+ final double y = vel.getY();
+ final double z = vel.getZ();
+
+ if (x > 4 || x < -4 || y > 4 || y < -4 || z > 4 || z < -4) {
+ return true;
+ }
+
+ return false;
+ }
+ // Paper end
+
@Override
public double getHeight() {
return getHandle().length;
diff --git a/src/main/java/org/spigotmc/WatchdogThread.java b/src/main/java/org/spigotmc/WatchdogThread.java
index 91b8aa6a16..0c106ea9c5 100644
--- a/src/main/java/org/spigotmc/WatchdogThread.java
+++ b/src/main/java/org/spigotmc/WatchdogThread.java
@@ -66,7 +66,19 @@ public class WatchdogThread extends Thread
log.log( Level.SEVERE, "During the run of the server, a physics stackoverflow was supressed" );
log.log( Level.SEVERE, "near " + net.minecraft.server.World.blockLocation);
}
- //
+ // Paper start - Warn in watchdog if an excessive velocity was ever set
+ if ( org.bukkit.craftbukkit.CraftServer.excessiveVelEx != null )
+ {
+ log.log( Level.SEVERE, "------------------------------" );
+ log.log( Level.SEVERE, "During the run of the server, a plugin set an excessive velocity on an entity" );
+ log.log( Level.SEVERE, "This may be the cause of the issue, or it may be entirely unrelated" );
+ log.log( Level.SEVERE, org.bukkit.craftbukkit.CraftServer.excessiveVelEx.getMessage());
+ for ( StackTraceElement stack : org.bukkit.craftbukkit.CraftServer.excessiveVelEx.getStackTrace() )
+ {
+ log.log( Level.SEVERE, "\t\t" + stack );
+ }
+ }
+ // Paper end
log.log( Level.SEVERE, "------------------------------" );
log.log( Level.SEVERE, "Server thread dump (Look for plugins here before reporting to Paper!):" );
dumpThread( ManagementFactory.getThreadMXBean().getThreadInfo( MinecraftServer.getServer().primaryThread.getId(), Integer.MAX_VALUE ), log );
--
2.19.0