RFR: 8273108: RunThese24H crashes with SEGV in markWord::displaced_mark_helper() after JDK-8268276

[Sandhya Viswanathan]

On Thu, 9 Dec 2021 22:43:28 GMT, Scott Gibbons <duke at openjdk.java.net> wrote:

> The base64 decoder overwrites memory past the end of its output buffer in certain cases.  It will not overwrite if the encoded string length is < 64 bytes.  It also will not overwrite if the encoded string length mod 64 is >= 16.  So the case where it *will* overwrite is when the input string length (the encoded byte length) mod 64 is less than 16.
> 
> I also added a test case to detect this overrun.

@asgibbons  The change looks good to me. Could you please create this PR versus JDK 18 (https://github.com/openjdk/jdk18).

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PR: https://git.openjdk.java.net/jdk/pull/6786