RFR [9] 7067728: Remove stopThread default java.policy

[Chris Hegarty]

The "stopThread” RuntimePermission is granted by default. The Thread.stop
methods have been deprecated for more than 15 years. It seems reasonable,
in a major release, to remove the default grant of stopThread.
 
diff --git a/src/java.base/share/conf/security/java.policy b/src/java.base/share/conf/security/java.policy
--- a/src/java.base/share/conf/security/java.policy
+++ b/src/java.base/share/conf/security/java.policy
@@ -94,17 +94,6 @@
 // default permissions granted to all domains
 
 grant {
-        // Allows any thread to stop itself using the java.lang.Thread.stop()
-        // method that takes no argument.
-        // Note that this permission is granted by default only to remain
-        // backwards compatible.
-        // It is strongly recommended that you either remove this permission
-        // from this policy file or further restrict it to code sources
-        // that you specify, because Thread.stop() is potentially unsafe.
-        // See the API specification of java.lang.Thread.stop() for more
-        // information.
-        permission java.lang.RuntimePermission "stopThread";
-
 
As a result of this change, untrusted code calling Thread.stop will throw a
SecurityException, as it will not have the required permission. The solution,
from the deployers perspective, is to add "stopThread” RuntimePermission
to the policy file.

-Chris.