Re: [PATCH RFC 03/10] arm64, kfence: enable KFENCE for ARM64

From: Marco Elver
Date: Wed Sep 09 2020 - 13:07:48 EST

Hello arm64 maintainers,

On Mon, 7 Sep 2020 at 15:41, Marco Elver <elver@xxxxxxxxxx> wrote:
> Add architecture specific implementation details for KFENCE and enable
> KFENCE for the arm64 architecture. In particular, this implements the
> required interface in <asm/kfence.h>. Currently, the arm64 version does
> not yet use a statically allocated memory pool, at the cost of a pointer
> load for each is_kfence_address().

> For ARM64, we would like to solicit feedback on what the best option is
> to obtain a constant address for __kfence_pool. One option is to declare
> a memory range in the memory layout to be dedicated to KFENCE (like is
> done for KASAN), however, it is unclear if this is the best available
> option. We would like to avoid touching the memory layout.

We can't yet tell what the best option for this might be. So, any
suggestions on how to go about switching to a static pool would be
much appreciated.

Many thanks,
-- Marco