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Add more info, triggers to watchdog velocity warn

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Adds entity name to exception message
Checks that the velocity to be set is NaN
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Zach Brown 2017-05-28 00:06:26 -05:00
parent 7611b62cf0
commit d032cd0568
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GPG Key ID: CC9DA35FC5450B76
1 changed files with 38 additions and 5 deletions
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43
Spigot-Server-Patches/0059-Add-velocity-warnings.patch
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@ -1,4 +1,4 @@
From 1dae630a507144c4669bb19181840fb3860bcb24 Mon Sep 17 00:00:00 2001
From 3ae56f998b55e3a503566891a5006dfd11c3dbd5 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
@ -17,21 +17,54 @@ index 1381d234e..00208ff45 100644
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 87813d59c..36c90e668 100644
index 87813d59c..0a05da58f 100644
--- a/src/main/java/org/bukkit/craftbukkit/entity/CraftEntity.java
+++ b/src/main/java/org/bukkit/craftbukkit/entity/CraftEntity.java
@@ -237,6 +237,11 @@ public abstract class CraftEntity implements org.bukkit.entity.Entity {
@@ -237,12 +237,44 @@ public abstract class CraftEntity implements org.bukkit.entity.Entity {
}
public void setVelocity(Vector vel) {
+ // Paper start - Warn server owners when plugins try to set super high velocities
+ if (!(this instanceof org.bukkit.entity.Projectile) && (vel.getX() > 4 || vel.getX() < -4 || vel.getY() > 4 || vel.getY() < -4 || vel.getZ() > 4 || vel.getZ() < -4)) {
+ CraftServer.excessiveVelEx = new Exception("Excessive velocity set detected: tried to set velocity of entity #" + getEntityId() + " to (" + vel.getX() + "," + vel.getY() + "," + vel.getZ() + ").");
+ if (!(this instanceof org.bukkit.entity.Projectile) && isUnsafeVelocity(vel)) {
+ CraftServer.excessiveVelEx = new Exception("Excessive velocity set detected: tried to set velocity of entity " + entity.getName() + " id #" + getEntityId() + " to (" + vel.getX() + "," + vel.getY() + "," + vel.getZ() + ").");
+ }
+ // Paper end
entity.motX = vel.getX();
entity.motY = vel.getY();
entity.motZ = vel.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;
+ } else if (x != x || y != y || z != z) { // NaN check
+ 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 3ed983cc0..6384d50e7 100644
--- a/src/main/java/org/spigotmc/WatchdogThread.java