From: Catalin Marinas <catalin.marinas@arm.com>
To: Andrey Konovalov <andreyknvl@google.com>
Cc: Mark Rutland <mark.rutland@arm.com>,
kvm@vger.kernel.org, Szabolcs Nagy <Szabolcs.Nagy@arm.com>,
Will Deacon <will.deacon@arm.com>,
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Robin Murphy <robin.murphy@arm.com>,
Christian Koenig <Christian.Koenig@amd.com>,
Luc Van Oostenryck <luc.vanoostenryck@gmail.com>
Subject: Re: [PATCH v16 02/16] arm64: untag user pointers in access_ok and __uaccess_mask_ptr
Date: Tue, 11 Jun 2019 18:39:04 +0100 [thread overview]
Message-ID: <20190611173903.4icrfmoyfvms35cy@mbp> (raw)
In-Reply-To: <CAAeHK+z5nSOOaGfehETzznNcMq5E5U+Eb1rZE16UVsT8FWT0Vg@mail.gmail.com>
On Tue, Jun 11, 2019 at 07:09:46PM +0200, Andrey Konovalov wrote:
> On Tue, Jun 11, 2019 at 4:57 PM Catalin Marinas <catalin.marinas@arm.com> wrote:
> >
> > On Mon, Jun 10, 2019 at 06:53:27PM +0100, Catalin Marinas wrote:
> > > On Mon, Jun 03, 2019 at 06:55:04PM +0200, Andrey Konovalov wrote:
> > > > diff --git a/arch/arm64/include/asm/uaccess.h b/arch/arm64/include/asm/uaccess.h
> > > > index e5d5f31c6d36..9164ecb5feca 100644
> > > > --- a/arch/arm64/include/asm/uaccess.h
> > > > +++ b/arch/arm64/include/asm/uaccess.h
> > > > @@ -94,7 +94,7 @@ static inline unsigned long __range_ok(const void __user *addr, unsigned long si
> > > > return ret;
> > > > }
> > > >
> > > > -#define access_ok(addr, size) __range_ok(addr, size)
> > > > +#define access_ok(addr, size) __range_ok(untagged_addr(addr), size)
> > >
> > > I'm going to propose an opt-in method here (RFC for now). We can't have
> > > a check in untagged_addr() since this is already used throughout the
> > > kernel for both user and kernel addresses (khwasan) but we can add one
> > > in __range_ok(). The same prctl() option will be used for controlling
> > > the precise/imprecise mode of MTE later on. We can use a TIF_ flag here
> > > assuming that this will be called early on and any cloned thread will
> > > inherit this.
> >
> > Updated patch, inlining it below. Once we agreed on the approach, I
> > think Andrey can insert in in this series, probably after patch 2. The
> > differences from the one I posted yesterday:
> >
> > - renamed PR_* macros together with get/set variants and the possibility
> > to disable the relaxed ABI
> >
> > - sysctl option - /proc/sys/abi/tagged_addr to disable the ABI globally
> > (just the prctl() opt-in, tasks already using it won't be affected)
> >
> > And, of course, it needs more testing.
>
> Sure, I'll add it to the series.
>
> Should I drop access_ok() change from my patch, since yours just reverts it?
Not necessary, your patch just relaxes the ABI for all apps, mine
tightens it. You could instead move the untagging to __range_ok() and
rebase my patch accordingly.
--
Catalin
next prev parent reply other threads:[~2019-06-11 17:39 UTC|newest]
Thread overview: 72+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-06-03 16:55 [PATCH v16 00/16] arm64: untag user pointers passed to the kernel Andrey Konovalov
2019-06-03 16:55 ` [PATCH v16 01/16] uaccess: add untagged_addr definition for other arches Andrey Konovalov
2019-06-03 17:02 ` Khalid Aziz
2019-06-03 17:06 ` Andrey Konovalov
2019-06-03 17:24 ` Khalid Aziz
2019-06-03 17:29 ` Christoph Hellwig
2019-06-03 18:17 ` Khalid Aziz
2019-06-04 11:45 ` Andrey Konovalov
2019-06-03 16:55 ` [PATCH v16 02/16] arm64: untag user pointers in access_ok and __uaccess_mask_ptr Andrey Konovalov
2019-06-08 3:51 ` Kees Cook
2019-06-10 17:53 ` Catalin Marinas
2019-06-10 18:07 ` Kees Cook
2019-06-10 18:53 ` Catalin Marinas
2019-06-10 20:36 ` Kees Cook
2019-06-11 14:57 ` Catalin Marinas
2019-06-11 17:09 ` Vincenzo Frascino
2019-06-12 9:32 ` Catalin Marinas
2019-06-12 11:52 ` Vincenzo Frascino
2019-06-11 17:09 ` Andrey Konovalov
2019-06-11 17:39 ` Catalin Marinas [this message]
2019-06-12 11:03 ` Andrey Konovalov
2019-06-12 11:04 ` Catalin Marinas
2019-06-03 16:55 ` [PATCH v16 03/16] lib, arm64: untag user pointers in strn*_user Andrey Konovalov
2019-06-08 3:48 ` Kees Cook
2019-06-11 20:06 ` Khalid Aziz
2019-06-03 16:55 ` [PATCH v16 04/16] mm: untag user pointers in do_pages_move Andrey Konovalov
2019-06-08 3:49 ` Kees Cook
2019-06-11 20:18 ` Khalid Aziz
2019-06-12 11:08 ` Andrey Konovalov
2019-06-03 16:55 ` [PATCH v16 05/16] arm64: untag user pointers passed to memory syscalls Andrey Konovalov
2019-06-08 3:51 ` Kees Cook
2019-06-10 14:28 ` Catalin Marinas
2019-06-11 15:35 ` Andrey Konovalov
2019-06-11 17:44 ` Catalin Marinas
2019-06-12 11:13 ` Andrey Konovalov
2019-06-03 16:55 ` [PATCH v16 06/16] mm, arm64: untag user pointers in mm/gup.c Andrey Konovalov
2019-06-08 3:59 ` Kees Cook
2019-06-03 16:55 ` [PATCH v16 07/16] mm, arm64: untag user pointers in get_vaddr_frames Andrey Konovalov
2019-06-08 4:00 ` Kees Cook
2019-06-10 14:29 ` Catalin Marinas
2019-06-03 16:55 ` [PATCH v16 08/16] fs, arm64: untag user pointers in copy_mount_options Andrey Konovalov
2019-06-08 4:02 ` Kees Cook
2019-06-11 14:38 ` Andrey Konovalov
2019-06-12 11:36 ` Andrey Konovalov
2019-06-03 16:55 ` [PATCH v16 09/16] fs, arm64: untag user pointers in fs/userfaultfd.c Andrey Konovalov
2019-06-08 4:03 ` Kees Cook
2019-06-12 10:45 ` Catalin Marinas
2019-06-03 16:55 ` [PATCH v16 10/16] drm/amdgpu, arm64: untag user pointers Andrey Konovalov
2019-06-03 16:55 ` [PATCH v16 11/16] drm/radeon, arm64: untag user pointers in radeon_gem_userptr_ioctl Andrey Konovalov
2019-06-03 16:55 ` [PATCH v16 12/16] IB, arm64: untag user pointers in ib_uverbs_(re)reg_mr() Andrey Konovalov
2019-06-03 17:46 ` Jason Gunthorpe
2019-06-04 12:18 ` Andrey Konovalov
2019-06-04 12:27 ` Jason Gunthorpe
2019-06-04 12:45 ` Andrey Konovalov
2019-06-04 13:02 ` Jason Gunthorpe
2019-06-04 13:09 ` Andrey Konovalov
2019-06-12 11:01 ` Catalin Marinas
2019-06-03 16:55 ` [PATCH v16 13/16] media/v4l2-core, arm64: untag user pointers in videobuf_dma_contig_user_get Andrey Konovalov
2019-06-08 3:52 ` Kees Cook
2019-06-03 16:55 ` [PATCH v16 14/16] tee, arm64: untag user pointers in tee_shm_register Andrey Konovalov
2019-06-07 5:33 ` Jens Wiklander
2019-06-08 4:05 ` Kees Cook
2019-06-03 16:55 ` [PATCH v16 15/16] vfio/type1, arm64: untag user pointers in vaddr_get_pfn Andrey Konovalov
2019-06-08 3:58 ` Kees Cook
2019-06-12 10:38 ` Catalin Marinas
2019-06-03 16:55 ` [PATCH v16 16/16] selftests, arm64: add a selftest for passing tagged pointers to kernel Andrey Konovalov
2019-06-08 3:56 ` Kees Cook
2019-06-10 22:08 ` shuah
2019-06-11 15:01 ` Catalin Marinas
2019-06-11 17:18 ` Andrey Konovalov
2019-06-11 17:50 ` Catalin Marinas
2019-06-12 11:14 ` Andrey Konovalov
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