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From: Dave Martin <Dave.Martin@arm.com>
To: Catalin Marinas <catalin.marinas@arm.com>
Cc: Mark Rutland <mark.rutland@arm.com>,
	kvm@vger.kernel.org, Szabolcs Nagy <Szabolcs.Nagy@arm.com>,
	Will Deacon <will.deacon@arm.com>,
	dri-devel@lists.freedesktop.org,
	Kostya Serebryany <kcc@google.com>,
	Khalid Aziz <khalid.aziz@oracle.com>,
	"open list:KERNEL SELFTEST FRAMEWORK"
	<linux-kselftest@vger.kernel.org>,
	Vincenzo Frascino <vincenzo.frascino@arm.com>,
	Will Deacon <will@kernel.org>,
	Jacob Bramley <Jacob.Bramley@arm.com>,
	Leon Romanovsky <leon@kernel.org>,
	linux-rdma@vger.kernel.org, amd-gfx@lists.freedesktop.org,
	Christoph Hellwig <hch@infradead.org>,
	Jason Gunthorpe <jgg@ziepe.ca>,
	Linux ARM <linux-arm-kernel@lists.infradead.org>,
	Ramana Radhakrishnan <Ramana.Radhakrishnan@arm.com>,
	Evgeniy Stepanov <eugenis@google.com>,
	linux-media@vger.kernel.org, Kees Cook <keescook@chromium.org>,
	Ruben Ayrapetyan <Ruben.Ayrapetyan@arm.com>,
	Andrey Konovalov <andreyknvl@google.com>,
	Kevin Brodsky <kevin.brodsky@arm.com>,
	Alex Williamson <alex.williamson@redhat.com>,
	Yishai Hadas <yishaih@mellanox.com>,
	Mauro Carvalho Chehab <mchehab@kernel.org>,
	Dmitry Vyukov <dvyukov@google.com>,
	Linux Memory Management List <linux-mm@kvack.org>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	Felix Kuehling <Felix.Kuehling@amd.com>,
	Dave Hansen <dave.hansen@intel.com>,
	LKML <linux-kernel@vger.kernel.org>,
	Jens Wiklander <jens.wiklander@linaro.org>,
	Lee Smith <Lee.Smith@arm.com>,
	Alexander Deucher <Alexander.Deucher@amd.com>,
	Andrew Morton <akpm@linux-foundation.org>, enh <enh@google.com>,
	Robin Murphy <robin.murphy@arm.com>,
	Christian Koenig <Christian.Koenig@amd.com>,
	Luc Van Oostenryck <luc.vanoostenryck@gmail.com>
Subject: Re: [PATCH v19 00/15] arm64: untag user pointers passed to the kernel
Date: Fri, 9 Aug 2019 10:28:00 +0100	[thread overview]
Message-ID: <20190809092758.GK10425@arm.com> (raw)
In-Reply-To: <20190809090016.GA23083@arrakis.emea.arm.com>

On Fri, Aug 09, 2019 at 10:00:17AM +0100, Catalin Marinas wrote:
> On Thu, Aug 08, 2019 at 04:09:04PM -0700, Kees Cook wrote:
> > On Thu, Aug 08, 2019 at 03:33:00PM -0700, Andrew Morton wrote:
> > > On Thu, 8 Aug 2019 14:12:19 -0700 Kees Cook <keescook@chromium.org> wrote:
> > > 
> > > > > The ones that are left are the mm ones: 4, 5, 6, 7 and 8.
> > > > > 
> > > > > Andrew, could you take a look and give your Acked-by or pick them up directly?
> > > > 
> > > > Given the subsystem Acks, it seems like 3-10 and 12 could all just go
> > > > via Andrew? I hope he agrees. :)
> > > 
> > > I'll grab everything that has not yet appeared in linux-next.  If more
> > > of these patches appear in linux-next I'll drop those as well.
> > > 
> > > The review discussion against " [PATCH v19 02/15] arm64: Introduce
> > > prctl() options to control the tagged user addresses ABI" has petered
> > > out inconclusively.  prctl() vs arch_prctl().
> > 
> > I've always disliked arch_prctl() existing at all. Given that tagging is
> > likely to be a multi-architectural feature, it seems like the controls
> > should live in prctl() to me.
> 
> It took a bit of grep'ing to figure out what Dave H meant by
> arch_prctl(). It's an x86-specific syscall which we do not have on arm64
> (and possibly any other architecture). Actually, we don't have any arm64
> specific syscalls, only the generic unistd.h, hence the confusion. For
> other arm64-specific prctls like SVE we used the generic sys_prctl() and
> I can see x86 not being consistent either (PR_MPX_ENABLE_MANAGEMENT).
> 
> In general I disagree with adding any arm64-specific syscalls but in
> this instance it can't even be justified. I'd rather see some clean-up
> similar to arch_ptrace/ptrace_request than introducing new syscall
> numbers (but as I suggested in my reply to Dave, that's for another
> patch series).

I had a go at refactoring this a while ago, but it fell by the wayside.

I can try to resurrect it if it's still considered worthwhile.

Cheers
---Dave

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  reply	other threads:[~2019-08-09  9:28 UTC|newest]

Thread overview: 51+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-07-23 17:58 [PATCH v19 00/15] arm64: untag user pointers passed to the kernel Andrey Konovalov
2019-07-23 17:58 ` [PATCH v19 01/15] arm64: untag user pointers in access_ok and __uaccess_mask_ptr Andrey Konovalov
2019-07-23 17:58 ` [PATCH v19 02/15] arm64: Introduce prctl() options to control the tagged user addresses ABI Andrey Konovalov
2019-07-31 17:05   ` Dave Hansen
2019-08-01 12:38     ` Kevin Brodsky
2019-08-01 16:45       ` Dave Hansen
2019-08-02 10:50         ` Catalin Marinas
2019-08-09 16:08   ` Catalin Marinas
2019-07-23 17:58 ` [PATCH v19 03/15] lib: untag user pointers in strn*_user Andrey Konovalov
2019-07-23 17:58 ` [PATCH v19 04/15] mm: untag user pointers passed to memory syscalls Andrey Konovalov
2019-08-09 16:03   ` Catalin Marinas
2019-07-23 17:58 ` [PATCH v19 05/15] mm: untag user pointers in mm/gup.c Andrey Konovalov
2019-07-23 17:58 ` [PATCH v19 06/15] mm: untag user pointers in get_vaddr_frames Andrey Konovalov
2019-07-23 17:58 ` [PATCH v19 07/15] fs/namespace: untag user pointers in copy_mount_options Andrey Konovalov
2019-07-23 17:58 ` [PATCH v19 08/15] userfaultfd: untag user pointers Andrey Konovalov
2019-07-23 17:58 ` [PATCH v19 09/15] drm/amdgpu: " Andrey Konovalov
2019-07-23 17:58 ` [PATCH v19 10/15] drm/radeon: untag user pointers in radeon_gem_userptr_ioctl Andrey Konovalov
2019-07-23 17:58 ` [PATCH v19 11/15] IB/mlx4: untag user pointers in mlx4_get_umem_mr Andrey Konovalov
2019-07-24 19:25   ` Jason Gunthorpe
2019-07-25 11:17     ` Andrey Konovalov
2019-07-23 17:58 ` [PATCH v19 12/15] media/v4l2-core: untag user pointers in videobuf_dma_contig_user_get Andrey Konovalov
2019-07-23 17:58 ` [PATCH v19 13/15] tee/shm: untag user pointers in tee_shm_register Andrey Konovalov
2019-07-23 17:58 ` [PATCH v19 14/15] vfio/type1: untag user pointers in vaddr_get_pfn Andrey Konovalov
2019-07-23 17:58 ` [PATCH v19 15/15] selftests, arm64: add a selftest for passing tagged pointers to kernel Andrey Konovalov
2019-07-23 18:03 ` [PATCH v19 00/15] arm64: untag user pointers passed to the kernel Andrey Konovalov
2019-07-24 14:02   ` Will Deacon
2019-07-24 14:16     ` Andrey Konovalov
2019-07-24 14:20       ` Will Deacon
2019-07-24 17:12         ` Vincenzo Frascino
2019-08-06 17:13         ` Will Deacon
2019-08-07 17:17           ` Andrey Konovalov
2019-08-08 21:12             ` Kees Cook
2019-08-08 22:33               ` Andrew Morton
2019-08-08 23:09                 ` Kees Cook
2019-08-09  9:00                   ` Catalin Marinas
2019-08-09  9:28                     ` Dave Martin [this message]
2019-07-25 13:50 ` [PATCH v6 0/2] arm64 relaxed ABI Vincenzo Frascino
2019-07-25 13:50   ` [PATCH v6 1/2] arm64: Define Documentation/arm64/tagged-address-abi.rst Vincenzo Frascino
2019-07-30 10:32     ` Kevin Brodsky
2019-07-30 13:25       ` Vincenzo Frascino
2019-07-30 13:57         ` Kevin Brodsky
2019-07-30 14:24           ` Vincenzo Frascino
2019-07-30 14:48             ` Kevin Brodsky
2019-07-31 16:43     ` Dave Hansen
2019-08-02 10:08       ` Catalin Marinas
2019-07-25 13:50   ` [PATCH v6 2/2] arm64: Relax Documentation/arm64/tagged-pointers.rst Vincenzo Frascino
2019-07-31 16:50 ` [PATCH v19 00/15] arm64: untag user pointers passed to the kernel Dave Hansen
2019-08-01 12:11   ` Kevin Brodsky
2019-08-01 12:48     ` Andrey Konovalov
2019-08-01 15:36       ` Dave Hansen
2019-08-02 10:20         ` Catalin Marinas

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