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

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Date:   Wed, 12 Jun 2019 13:14:30 +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,
        linux-rdma@...r.kernel.org, linux-media@...r.kernel.org,
        kvm@...r.kernel.org,
        "open list:KERNEL SELFTEST FRAMEWORK" 
        <linux-kselftest@...r.kernel.org>,
        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>,
        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>
Subject: Re: [PATCH v16 16/16] selftests, arm64: add a selftest for passing
 tagged pointers to kernel

On Tue, Jun 11, 2019 at 7:50 PM Catalin Marinas <catalin.marinas@....com> wrote:
>
> On Tue, Jun 11, 2019 at 07:18:04PM +0200, Andrey Konovalov wrote:
> > On Tue, Jun 11, 2019 at 5:01 PM Catalin Marinas <catalin.marinas@....com> wrote:
> > > static void *tag_ptr(void *ptr)
> > > {
> > >         static int tagged_addr_err = 1;
> > >         unsigned long tag = 0;
> > >
> > >         if (tagged_addr_err == 1)
> > >                 tagged_addr_err = prctl(PR_SET_TAGGED_ADDR_CTRL,
> > >                                         PR_TAGGED_ADDR_ENABLE, 0, 0, 0);
> >
> > I think this requires atomics. malloc() can be called from multiple threads.
>
> It's slightly racy but I assume in a real libc it can be initialised
> earlier than the hook calls while still in single-threaded mode (I had
> a quick attempt with __attribute__((constructor)) but didn't get far).
>
> Even with the race, under normal circumstances calling the prctl() twice
> is not a problem. I think the risk here is that someone disables the ABI
> via sysctl and the ABI is enabled for some of the threads only.

OK, I'll keep the code racy, but add a comment pointing it out. Thanks!

>
> --
> Catalin