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From:   Marco Elver <elver@google.com>
Date:   Tue, 22 Sep 2020 11:56:26 +0200
Message-ID: <CANpmjNNdGWoY_FcqUDUZ2vXy840H2+LGzN3WWrK8iERTKntSTw@mail.gmail.com>
Subject: Re: [PATCH v3 03/10] arm64, kfence: enable KFENCE for ARM64
To:     Will Deacon <will@kernel.org>
Cc:     Alexander Potapenko <glider@google.com>,
        Andrew Morton <akpm@linux-foundation.org>,
        "H. Peter Anvin" <hpa@zytor.com>,
        "Paul E. McKenney" <paulmck@kernel.org>,
        Andrey Konovalov <andreyknvl@google.com>,
        Andrey Ryabinin <aryabinin@virtuozzo.com>,
        Andy Lutomirski <luto@kernel.org>,
        Borislav Petkov <bp@alien8.de>,
        Catalin Marinas <catalin.marinas@arm.com>,
        Christoph Lameter <cl@linux.com>,
        Dave Hansen <dave.hansen@linux.intel.com>,
        David Rientjes <rientjes@google.com>,
        Dmitriy Vyukov <dvyukov@google.com>,
        Eric Dumazet <edumazet@google.com>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Hillf Danton <hdanton@sina.com>,
        Ingo Molnar <mingo@redhat.com>, Jann Horn <jannh@google.com>,
        Jonathan Cameron <Jonathan.Cameron@huawei.com>,
        Jonathan Corbet <corbet@lwn.net>,
        Joonsoo Kim <iamjoonsoo.kim@lge.com>,
        Kees Cook <keescook@chromium.org>,
        Mark Rutland <mark.rutland@arm.com>,
        Pekka Enberg <penberg@kernel.org>,
        Peter Zijlstra <peterz@infradead.org>,
        SeongJae Park <sjpark@amazon.com>,
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On Mon, 21 Sep 2020 at 19:44, Will Deacon <will@kernel.org> wrote:
[...]
> > > > > For ARM64, we would like to solicit feedback on what the best option is
> > > > > to obtain a constant address for __kfence_pool. One option is to declare
> > > > > a memory range in the memory layout to be dedicated to KFENCE (like is
> > > > > done for KASAN), however, it is unclear if this is the best available
> > > > > option. We would like to avoid touching the memory layout.
> > > >
> > > > Sorry for the delay on this.
> > >
> > > NP, thanks for looking!
> > >
> > > > Given that the pool is relatively small (i.e. when compared with our virtual
> > > > address space), dedicating an area of virtual space sounds like it makes
> > > > the most sense here. How early do you need it to be available?
> > >
> > > Yes, having a dedicated address sounds good.
> > > We're inserting kfence_init() into start_kernel() after timekeeping_init().
> > > So way after mm_init(), if that matters.
> >
> > The question is though, how big should that dedicated area be?
> > Right now KFENCE_NUM_OBJECTS can be up to 16383 (which makes the pool
> > size 64MB), but this number actually comes from the limitation on
> > static objects, so we might want to increase that number on arm64.
>
> What happens on x86 and why would we do something different?

On x86 we just do `char __kfence_pool[KFENCE_POOL_SIZE] ...;` to
statically allocate the pool. On arm64 this doesn't seem to work
because static memory doesn't have struct pages?

Thanks,
-- Marco