From mboxrd@z Thu Jan  1 00:00:00 1970
From: Andrey Konovalov <andreyknvl@google.com>
Subject: Re: [PATCH v17 03/15] arm64: Introduce prctl() options to control the
 tagged user addresses ABI
Date: Wed, 19 Jun 2019 16:45:02 +0200
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Cc: Mark Rutland <mark.rutland@arm.com>, Szabolcs Nagy <Szabolcs.Nagy@arm.com>, Catalin Marinas <catalin.marinas@arm.com>, Will Deacon <will.deacon@arm.com>, Kostya Serebryany <kcc@google.com>, Khalid Aziz <khalid.aziz@oracle.com>, Felix Kuehling <Felix.Kuehling@amd.com>, Vincenzo Frascino <vincenzo.frascino@arm.com>, Jacob Bramley <Jacob.Bramley@arm.com>, Leon Romanovsky <leon@kernel.org>, Christoph Hellwig <hch@infradead.org>, Jason Gunthorpe <jgg@ziepe.ca>, Dave Martin <Dave.Martin@arm.com>, Evgeniy Stepanov <eugenis@google.com>, Kevin Brodsky <kevin.brodsky@arm.com>, Kees Cook <keescook@chromium.org>, Ruben Ayrapetyan <Ruben.Ayrapetyan@arm.com>, Ramana Radhakrishnan <Ramana.Radhakrishnan@arm.com>, Alex Williamson <alex.williamson@redhat.com>, Mauro Carvalho Chehab <mchehab@kernel.org>, Dmitry Vyukov <dvyukov@google.com>, Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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On Wed, Jun 12, 2019 at 1:43 PM Andrey Konovalov <andreyknvl@google.com> wrote:
>
> From: Catalin Marinas <catalin.marinas@arm.com>
>
> It is not desirable to relax the ABI to allow tagged user addresses into
> the kernel indiscriminately. This patch introduces a prctl() interface
> for enabling or disabling the tagged ABI with a global sysctl control
> for preventing applications from enabling the relaxed ABI (meant for
> testing user-space prctl() return error checking without reconfiguring
> the kernel). The ABI properties are inherited by threads of the same
> application and fork()'ed children but cleared on execve().
>
> The PR_SET_TAGGED_ADDR_CTRL will be expanded in the future to handle
> MTE-specific settings like imprecise vs precise exceptions.
>
> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>

Catalin, would you like to do the requested changes to this patch
yourself and send it to me or should I do that?