RFR: 8284910: Buffer clean in PasswordCallback [v8]

[Roger Riggs]

On Wed, 27 Apr 2022 16:02:05 GMT, Xue-Lei Andrew Fan <xuelei at openjdk.org> wrote:

>> Please review this password cleanup enhancement in the PasswordCallback implementation.  This is one of the effort to clean up the buffered passwords.
>> 
>> The PasswordCallback.setPassword() clones the password, but is not registered for cleanup. An application could call clearPassword() for the purpose, but it would be nice to cleanup the buffer as well if clearPassword() was not called in an application. And, if the setPassword() get called multiple times, the clearPassword() should also be called the same times if not relying on finalization. It could be fragile in practice.
>
> Xue-Lei Andrew Fan has updated the pull request incrementally with one additional commit since the last revision:
> 
>   remove trailing whitespace

test/jdk/javax/security/auth/callback/PasswordCallback/CheckCleanerBound.java line 50:

> 48:         for (int i = 0; i < 10 && weakHashMap.size() != 0; i++) {
> 49:             System.gc();
> 50:             Thread.sleep(100);

You can drop this sleep to 10ms to cut the average test time.  It might be interesting to know how many retries are typical.

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PR: https://git.openjdk.java.net/jdk/pull/8272