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

[Alan Hayward]

On Mon, 31 Jan 2022 22:35:35 GMT, David Holmes <dholmes at openjdk.org> wrote:

>> Alan Hayward has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Fix popframe failures
>
> src/hotspot/cpu/aarch64/vm_version_aarch64.cpp line 429:
> 
>> 427: #else
>> 428:     warning("UseROPProtection specified, but not supported in the VM.");
>> 429: #endif
> 
> If we issue these warnings should `_rop_protection` still be set true?

As per this conversation: https://github.com/openjdk/jdk/pull/6334#discussion_r791722292

The idea was, the user is explicitly asking for asking for pac-ret so we should honour that. Whereas standard would only enable what is supported for that system.

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