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RE: [PATCH for-4.17] xen/arm: Support properly __ro_after_init on Arm
- To: Julien Grall <julien@xxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- From: Henry Wang <Henry.Wang@xxxxxxx>
- Date: Wed, 17 Aug 2022 04:45:52 +0000
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- Cc: Julien Grall <jgrall@xxxxxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Bertrand Marquis <Bertrand.Marquis@xxxxxxx>, Volodymyr Babchuk <Volodymyr_Babchuk@xxxxxxxx>
- Delivery-date: Wed, 17 Aug 2022 04:46:14 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
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- Thread-topic: [PATCH for-4.17] xen/arm: Support properly __ro_after_init on Arm
Hi Julien,
> -----Original Message-----
> Subject: [PATCH for-4.17] xen/arm: Support properly __ro_after_init on Arm
>
> From: Julien Grall <jgrall@xxxxxxxxxx>
>
> __ro_after_init was introduced recently to prevent modifying
> some variables after init.
>
> At the moment, on Arm, the variables will still be accessible
> because the region permission is not updated.
>
> Address that, but moving the sections .data.ro_after_init
> out of .data and then mark the region read-only once we finish
> to boot.
>
> Signed-off-by: Julien Grall <jgrall@xxxxxxxxxx>
Tested-by: Henry Wang <Henry.Wang@xxxxxxx>
Kind regards,
Henry
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