RFR: 8277204: Implementation of JEP 8264130: PAC-RET protection for Linux/AArch64 [v9]

[Andrew Haley]

On Tue, 25 Jan 2022 14:22:15 GMT, Alan Hayward <duke at openjdk.java.net> wrote:

>> Was this ever resolved?
>
> Sort of. That code has changed quite a bit - UseROPProtection now is a string field not a bool.
> "none" or not set - pac disabled.
> "pac-ret" - pac always enabled
> "standard" - pac enabled if the cpu+os support it.
> 
> Also, the pac instructions used aren't all in the NOP space. So, it will crash on a non-pac machine.  It might be possible to change it so it does only use nop space instructions, but I don't think it'll be optimal (need to double check).

OK, cool.

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