8321131: Console read line with zero out should zero out underlying buffer in JLine

Reviewed-by: iris, alanb, jlahoda

src/jdk.internal.le/share/classes/jdk/internal/org/jline/JdkConsoleProviderImpl.java

@@ -67,6 +67,9 @@ public class JdkConsoleProviderImpl implements JdkConsoleProvider {
      * public Console class.
      */
     private static class JdkConsoleImpl implements JdkConsole {
+        private final Terminal terminal;
+        private volatile LineReader jline;
+
         @Override
         public PrintWriter writer() {
             return terminal.writer();
@@ -110,6 +113,8 @@ public class JdkConsoleProviderImpl implements JdkConsoleProvider {
                 return jline.readLine(fmt.formatted(args), '\0').toCharArray();
             } catch (EndOfFileException eofe) {
                 return null;
+            } finally {
+                jline.getBuffer().zeroOut();
             }
         }
 
@@ -128,9 +133,6 @@ public class JdkConsoleProviderImpl implements JdkConsoleProvider {
             return terminal.encoding();
         }
 
-        private final Terminal terminal;
-        private volatile LineReader jline;
-
         public JdkConsoleImpl(Terminal terminal) {
             this.terminal = terminal;
         }

src/jdk.internal.le/share/classes/jdk/internal/org/jline/reader/Buffer.java

@@ -84,4 +84,8 @@ public interface Buffer {
 
     void copyFrom(Buffer buffer);
 
+    // JDK specific modification
+    default void zeroOut() {
+        throw new UnsupportedOperationException();
+    }
 }

src/jdk.internal.le/share/classes/jdk/internal/org/jline/reader/impl/BufferImpl.java

@@ -8,6 +8,7 @@
  */
 package jdk.internal.org.jline.reader.impl;
 
+import java.util.Arrays;
 import java.util.Objects;
 
 import jdk.internal.org.jline.reader.Buffer;
@@ -369,4 +370,10 @@ public class BufferImpl implements Buffer
             g1 += l;
         }
     }
+
+    // JDK specific modification
+    @Override
+    public void zeroOut() {
+        Arrays.fill(buffer, 0);
+    }
 }