RFR: 8277204: Implementation of JEP 8264130: PAC-RET protection for Linux/AArch64 [v14]

[Alan Hayward]

On Tue, 1 Feb 2022 18:33:28 GMT, Andrew Haley <aph at openjdk.org> wrote:

>> But we can't honour that because it is not supported. Further, the suggestion in the referenced discussion seemed to be based on the assumption that doing so would be harmless because it is NOP based, but you have indicated that may not be the case and so it may actually lead to a crash!
>
> Given that the implementation has now changed so much that it's no longer NOP based, I'll go with @dholmes-ora .
> One other thing, though: it might be better to say here "but this VM was built without ROP-protection support." That's more informative, IMO.

Ok, I'll fix up as suggested.

The beginning part of that message needs fixing too - UseROPProtection is no longer the name of the flag. I'll switch to:
"ROP-protection specified, but this VM was built without ROP-protection support."

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PR: https://git.openjdk.java.net/jdk/pull/6334