linux-kernel - Re: [PATCH v16 16/16] selftests, arm64: add a selftest for passing tagged pointers to kernel

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Message-ID: <2bc277f8-e67e-30e0-5824-8184c2b03237@kernel.org>
Date:   Mon, 10 Jun 2019 16:08:10 -0600
From:   shuah <shuah@...nel.org>
To:     Kees Cook <keescook@...omium.org>,
        Andrey Konovalov <andreyknvl@...gle.com>
Cc:     linux-arm-kernel@...ts.infradead.org, linux-mm@...ck.org,
        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,
        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>,
        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>,
        Jason Gunthorpe <jgg@...pe.ca>,
        Christoph Hellwig <hch@...radead.org>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Kostya Serebryany <kcc@...gle.com>,
        Evgeniy Stepanov <eugenis@...gle.com>,
        Lee Smith <Lee.Smith@....com>,
        Ramana Radhakrishnan <Ramana.Radhakrishnan@....com>,
        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>, shuah <shuah@...nel.org>
Subject: Re: [PATCH v16 16/16] selftests, arm64: add a selftest for passing
 tagged pointers to kernel

On 6/7/19 9:56 PM, Kees Cook wrote:
> On Mon, Jun 03, 2019 at 06:55:18PM +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 adds a simple test, that calls the uname syscall with a
>> tagged user pointer as an argument. Without the kernel accepting tagged
>> user pointers the test fails with EFAULT.
>>
>> Signed-off-by: Andrey Konovalov <andreyknvl@...gle.com>
> 
> I'm adding Shuah to CC in case she has some suggestions about the new
> selftest.

Thanks Kees.

> 
> Reviewed-by: Kees Cook <keescook@...omium.org>
> 
> -Kees
> 

Looks good to me.

Acked-by: Shuah Khan <skhan@...uxfoundation.org>

thanks,
-- Shuah