Console.readPassword() was failed on Linux s390x platform

[Ichiroh Takiguchi]

Hello.

I ran following testcase on Linux s390x platform.
------
import java.io.Console;

public class ConsoleTestC {
   public static void main(String[] args) {
     Console console = System.console();
     char password[] = console.readPassword("password> ");
     System.out.println(password);
   }
}
------

Test instruction
1. Compile and run ConsoleTestC on terminal
$ java ConsoleTestC
password>
2. Type "abc", then "abc" is displayed
3. Type "ls", but nothing is displayed
4. Type "stty echo" to change back the setting

I wrote following program for PD.
------
import java.io.*;
import java.lang.reflect.*;

public class ConsoleTestB {
   public static void main(String[] args) throws Exception {
     Console console = System.console();
     Method echo = Console.class.getDeclaredMethod("echo", 
boolean.class);
     echo.setAccessible(true);
     System.out.println("echo false");
     System.out.println(echo.invoke(console, false));
     console.reader().read();
     System.out.println("echo true");
     System.out.println(echo.invoke(console, true));
   }
}
------

Test instruction
1. Compile and run ConsoleTestB on terminal
$ java ConsoleTestB
......
echo false
false
2. Last output should be "true", so Java could not read echo flag 
properly
3. Press return key
echo true
false
$

Console.readPassword() could not read initial echo flag,
so move back to "-echo" instead of "echo"

Fix candidate is as follows:
======
diff -r 14708e1acdc3 src/java.base/unix/native/libjava/Console_md.c
--- a/src/java.base/unix/native/libjava/Console_md.c    Tue Jul 03 
09:27:41 2018 +0800
+++ b/src/java.base/unix/native/libjava/Console_md.c    Fri Jul 20 
02:52:38 2018 +0900
@@ -56,7 +56,7 @@
          JNU_ThrowIOExceptionWithLastError(env, "tcgetattr failed");
          return !on;
      }
-    old = (tio.c_lflag & ECHO);
+    old = (tio.c_lflag & ECHO) == ECHO ? JNI_TRUE : JNI_FALSE;
      if (on) {
          tio.c_lflag |= ECHO;
      } else {
======

I'd like to obtain a sponsor for this patch.
Could you put it into JDK11 ?

Thanks,
Ichiroh Takiguchi
IBM Japan, Ltd.