linux-kernel - Re: [PATCH v19 00/15] arm64: untag user pointers passed to the kernel

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Message-ID: <CAAeHK+zTFqsLiB3Wf0bAi5A8ukQX5ZuvfUg4td-=r5UhBsUBOQ@mail.gmail.com>
Date:   Thu, 1 Aug 2019 14:48:37 +0200
From:   Andrey Konovalov <andreyknvl@...gle.com>
To:     Kevin Brodsky <kevin.brodsky@....com>
Cc:     Dave Hansen <dave.hansen@...el.com>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        Linux Memory Management List <linux-mm@...ck.org>,
        LKML <linux-kernel@...r.kernel.org>,
        amd-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
        linux-rdma@...r.kernel.org, linux-media@...r.kernel.org,
        kvm@...r.kernel.org,
        "open list:KERNEL SELFTEST FRAMEWORK" 
        <linux-kselftest@...r.kernel.org>,
        Catalin Marinas <catalin.marinas@....com>,
        Vincenzo Frascino <vincenzo.frascino@....com>,
        Will Deacon <will.deacon@....com>,
        Mark Rutland <mark.rutland@....com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Kees Cook <keescook@...omium.org>,
        Yishai Hadas <yishaih@...lanox.com>,
        Felix Kuehling <Felix.Kuehling@....com>,
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        Christian Koenig <Christian.Koenig@....com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Jens Wiklander <jens.wiklander@...aro.org>,
        Alex Williamson <alex.williamson@...hat.com>,
        Leon Romanovsky <leon@...nel.org>,
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        Ramana Radhakrishnan <Ramana.Radhakrishnan@....com>,
        Jacob Bramley <Jacob.Bramley@....com>,
        Ruben Ayrapetyan <Ruben.Ayrapetyan@....com>,
        Robin Murphy <robin.murphy@....com>,
        Szabolcs Nagy <Szabolcs.Nagy@....com>
Subject: Re: [PATCH v19 00/15] arm64: untag user pointers passed to the kernel

On Thu, Aug 1, 2019 at 2:11 PM Kevin Brodsky <kevin.brodsky@....com> wrote:
>
> On 31/07/2019 17:50, Dave Hansen wrote:
> > On 7/23/19 10:58 AM, Andrey Konovalov wrote:
> >> The mmap and mremap (only new_addr) syscalls do not currently accept
> >> tagged addresses. Architectures may interpret the tag as a background
> >> colour for the corresponding vma.
> > What the heck is a "background colour"? :)
>
> Good point, this is some jargon that we started using for MTE, the idea being that
> the kernel could set a tag value (specified during mmap()) as "background colour" for
> anonymous pages allocated in that range.
>
> Anyway, this patch series is not about MTE. Andrey, for v20 (if any), I think it's
> best to drop this last sentence to avoid any confusion.

Sure, thanks!

>
> Kevin