linux-kernel - Re: [PATCH v16 05/16] arm64: untag user pointers passed to memory syscalls

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Message-ID: <CAAeHK+zBDB6i+iEw+TJY14gZeccvWeOBEaU+otn1F+jzDLaRpA@mail.gmail.com>
Date:   Tue, 11 Jun 2019 17:35:31 +0200
From:   Andrey Konovalov <andreyknvl@...gle.com>
To:     Catalin Marinas <catalin.marinas@....com>
Cc:     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,
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        "open list:KERNEL SELFTEST FRAMEWORK" 
        <linux-kselftest@...r.kernel.org>,
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        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>,
        Alexander Deucher <Alexander.Deucher@....com>,
        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>,
        Luc Van Oostenryck <luc.vanoostenryck@...il.com>,
        Dave Martin <Dave.Martin@....com>,
        Khalid Aziz <khalid.aziz@...cle.com>, enh <enh@...gle.com>,
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        Lee Smith <Lee.Smith@....com>,
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        Jacob Bramley <Jacob.Bramley@....com>,
        Ruben Ayrapetyan <Ruben.Ayrapetyan@....com>,
        Robin Murphy <robin.murphy@....com>,
        Kevin Brodsky <kevin.brodsky@....com>,
        Szabolcs Nagy <Szabolcs.Nagy@....com>
Subject: Re: [PATCH v16 05/16] arm64: untag user pointers passed to memory syscalls

On Mon, Jun 10, 2019 at 4:28 PM Catalin Marinas <catalin.marinas@....com> wrote:
>
> On Mon, Jun 03, 2019 at 06:55:07PM +0200, Andrey Konovalov wrote:
> > This patch is a part of a series that extends arm64 kernel ABI to allow to
> > pass tagged user pointers (with the top byte set to something else other
> > than 0x00) as syscall arguments.
> >
> > This patch allows tagged pointers to be passed to the following memory
> > syscalls: get_mempolicy, madvise, mbind, mincore, mlock, mlock2, mprotect,
> > mremap, msync, munlock.
> >
> > Signed-off-by: Andrey Konovalov <andreyknvl@...gle.com>
>
> I would add in the commit log (and possibly in the code with a comment)
> that mremap() and mmap() do not currently accept tagged hint addresses.
> Architectures may interpret the hint tag as a background colour for the
> corresponding vma. With this:

I'll change the commit log. Where do you you think I should put this
comment? Before mmap and mremap definitions in mm/?

Thanks!

>
> Reviewed-by: Catalin Marinas <catalin.marinas@....com>
>
> --
> Catalin