RFR: 8321053: Use ByteArrayInputStream.buf directly when parameter of transferTo() is trusted

[jmehrens]

On Thu, 30 Nov 2023 00:03:21 GMT, Brian Burkhalter <bpb at openjdk.org> wrote:

> Pass `ByteArrayInputStream.buf ` directly to the `OutputStream` parameter of `BAIS.transferTo` only if the target stream is in the `java.io` package.

src/java.base/share/classes/java/io/ByteArrayInputStream.java line 211:

> 209:         if (len > 0) {
> 210:             byte[] tmp;
> 211:             if ("java.io".equals(out.getClass().getPackageName()))

Isn't this protection defeated with:

ByteArrayInputStream bais = new ByteArrayInputStream(bytes);
UntrustedOutputStream uos = new UntrustedOutputStream();
bais.transferTo(new java.io.DataOutputStream(uos)); 


Or am I missing something?

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PR Review Comment: https://git.openjdk.org/jdk/pull/16893#discussion_r1410139928