[jdk21u-dev] RFR: 8345296: AArch64: VM crashes with SIGILL when prctl is disallowed

[Kerem Kat]

On Wed, 11 Dec 2024 17:24:05 GMT, Kerem Kat <krk at openjdk.org> wrote:

> Ref. https://github.com/openjdk/jdk/pull/22479
> 
>> We have caught this in some prod environments, where prctl is forbidden by the sandboxing mechanism. This fails the JVM
> 
> Backport depends on [JDK-8339063](https://bugs.openjdk.org/browse/) which is included.
> 
> JDK-8339063 did not apply cleanly, resolved conflict in `src/hotspot/cpu/aarch64/aarch64.ad` by keeping const qualifiers. These were removed in [JDK-8310948](https://bugs.openjdk.org/browse/JDK-8310948) which doesn't apply cleanly either.
> 
> Additional testing:
> 
> - [x] Verified the bug is fixed with the seccomp repro from [JDK-8345296](https://bugs.openjdk.org/browse/JDK-8345296?focusedId=14727386&page=com.atlassian.jira.plugin.system.issuetabpanels%3Acomment-tabpanel#comment-14727386): Segfault without the patch, works with.

Thanks for the details. Yes, it was to access the new `FloatRegister` constants. Simplifying this now.

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PR Comment: https://git.openjdk.org/jdk21u-dev/pull/1222#issuecomment-2538653197