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From:   Andrey Konovalov <andreyknvl@google.com>
Date:   Wed, 19 Jun 2019 16:45:02 +0200
Message-ID: <CAAeHK+xvtqALY9DESF048mR17Po=W++QwWOUOOeSXKgriVTC-w@mail.gmail.com>
Subject: Re: [PATCH v17 03/15] arm64: Introduce prctl() options to control the
 tagged user addresses ABI
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Cc:     Catalin Marinas <catalin.marinas@arm.com>,
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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?