linux-kernel - Re: [PATCH v15 05/17] arms64: untag user pointers passed to memory syscalls

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Message-ID: <20190528155644.GD28398@e103592.cambridge.arm.com>
Date:   Tue, 28 May 2019 16:56:45 +0100
From:   Dave Martin <Dave.Martin@....com>
To:     Catalin Marinas <catalin.marinas@....com>
Cc:     Andrew Murray <andrew.murray@....com>,
        Mark Rutland <mark.rutland@....com>, kvm@...r.kernel.org,
        Christian Koenig <Christian.Koenig@....com>,
        Szabolcs Nagy <Szabolcs.Nagy@....com>,
        Will Deacon <will.deacon@....com>,
        dri-devel@...ts.freedesktop.org, linux-mm@...ck.org,
        Lee Smith <Lee.Smith@....com>, linux-kselftest@...r.kernel.org,
        Vincenzo Frascino <vincenzo.frascino@....com>,
        Jacob Bramley <Jacob.Bramley@....com>,
        Leon Romanovsky <leon@...nel.org>, linux-rdma@...r.kernel.org,
        amd-gfx@...ts.freedesktop.org,
        linux-arm-kernel@...ts.infradead.org,
        Evgeniy Stepanov <eugenis@...gle.com>,
        linux-media@...r.kernel.org, Kees Cook <keescook@...omium.org>,
        Ruben Ayrapetyan <Ruben.Ayrapetyan@....com>,
        Andrey Konovalov <andreyknvl@...gle.com>,
        Kevin Brodsky <kevin.brodsky@....com>,
        Alex Williamson <alex.williamson@...hat.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Kostya Serebryany <kcc@...gle.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Felix Kuehling <Felix.Kuehling@....com>,
        linux-kernel@...r.kernel.org,
        Jens Wiklander <jens.wiklander@...aro.org>,
        Ramana Radhakrishnan <Ramana.Radhakrishnan@....com>,
        Alexander Deucher <Alexander.Deucher@....com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Robin Murphy <robin.murphy@....com>,
        Yishai Hadas <yishaih@...lanox.com>,
        Luc Van Oostenryck <luc.vanoostenryck@...il.com>
Subject: Re: [PATCH v15 05/17] arms64: untag user pointers passed to memory
 syscalls

On Tue, May 28, 2019 at 04:40:58PM +0100, Catalin Marinas wrote:

[...]

> My thoughts on allowing tags (quick look):
>
> brk - no

[...]

> mlock, mlock2, munlock - yes
> mmap - no (we may change this with MTE but not for TBI)

[...]

> mprotect - yes

I haven't following this discussion closely... what's the rationale for
the inconsistencies here (feel free to refer me back to the discussion
if it's elsewhere).

Cheers
---Dave