stable backports for arm64 shadow call stack pointer hardening patches

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Subject: stable backports for arm64 shadow call stack pointer hardening patches
From: Ard Biesheuvel <ardb@xxxxxxxxxx>
Date: Tue, 2 May 2023 11:57:38 +0200

Please backport the following changes to stable kernels v5.10 and newer:

2198d07c509f1db4 arm64: Always load shadow stack pointer directly from
the task struct
59b37fe52f499557 arm64: Stash shadow stack pointer in the task struct
on interrupt

Thanks,
Ard.

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