Subject.java (doAsPrivileged): If acc is null, create a new AccessControlContext.

2005-02-08  Andrew Haley  <aph@redhat.com>

        * javax/security/auth/Subject.java (doAsPrivileged): If acc is
        null, create a new AccessControlContext.
        * java/security/SecureClassLoader.java (protectionDomainCache):
        new field.
        (defineClass): Create a new protection domain and add it to our
        cache.

        * java/rmi/server/UnicastRemoteObject.java (exportObject): Call
        addStub() to keep track of the stub we've exported.
        (unexportObject): Call deleteStub().
        * java/rmi/server/RemoteObject.java (stubs): New field.
        (addStub): New method.
        (deleteStub): New method.
        (toStub): Rewrite.

        * java/lang/VMCompiler.java (loadSharedLibrary): Pass
        true to findHelper (tryParents).
        * gnu/gcj/runtime/SharedLibLoader.java (SharedLibLoader):
        Likewise.
        * java/net/URLClassLoader.java (SoURLLoader): Likewise.
        * gnu/gcj/runtime/SharedLibHelper.java (SharedLibHelper): Pass
        ProtectionDomain.
        If tryParents is false, don't scan parent class loaders.

        * java/security/Permissions.java (PermissionsHash.implies):
        Iterate over the collection and invoke implies() on each
        element.

From-SVN: r95111

libjava/java/security/Permissions.java

@@ -228,9 +228,18 @@ class PermissionsHash extends PermissionCollection
    * @param perm the permission to check
    * @return true if it is implied
    */
+  // FIXME: Should this method be synchronized?
   public boolean implies(Permission perm)
   {
-    return perms.get(perm) != null;
+    Enumeration elements = elements();
+
+    while (elements.hasMoreElements())
+      {
+	Permission p = (Permission)elements.nextElement();
+	if (p.implies(perm))
+	  return true;
+      }
+    return false;
   }
 
   /**

libjava/java/security/SecureClassLoader.java

@@ -48,6 +48,8 @@ package java.security;
  */
 public class SecureClassLoader extends ClassLoader
 {
+  java.util.WeakHashMap protectionDomainCache = new java.util.WeakHashMap();
+
   protected SecureClassLoader(ClassLoader parent)
   {
     super(parent);
@@ -80,11 +82,29 @@ public class SecureClassLoader extends ClassLoader
   protected final Class defineClass(String name, byte[] b, int off, int len,
 				    CodeSource cs)
   {
-    // FIXME: Need to cache ProtectionDomains according to 1.3 docs.
     if (cs != null)
       {
-	ProtectionDomain protectionDomain
-          = new ProtectionDomain(cs, getPermissions(cs), this, null);
+	ProtectionDomain protectionDomain;
+	  
+	synchronized (protectionDomainCache)
+	  {
+	    protectionDomain = (ProtectionDomain)protectionDomainCache.get(cs);
+	  }
+
+	if (protectionDomain == null)
+	  {
+	    protectionDomain 
+	      = new ProtectionDomain(cs, getPermissions(cs), this, null);
+	    synchronized (protectionDomainCache)
+	      {
+		ProtectionDomain domain 
+		  = (ProtectionDomain)protectionDomainCache.get(cs);
+		if (domain == null)
+		  protectionDomainCache.put(cs, protectionDomain);
+		else
+		  protectionDomain = domain;
+	      }
+	  }
 	return super.defineClass(name, b, off, len, protectionDomain);
       } 
     else