From: Andrey Konovalov <andreyknvl@google.com>
To: Jason Gunthorpe <jgg@ziepe.ca>,
Catalin Marinas <catalin.marinas@arm.com>
Cc: Linux ARM <linux-arm-kernel@lists.infradead.org>,
Linux Memory Management List <linux-mm@kvack.org>,
LKML <linux-kernel@vger.kernel.org>,
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"open list:KERNEL SELFTEST FRAMEWORK"
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Andrew Morton <akpm@linux-foundation.org>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Kees Cook <keescook@chromium.org>,
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Szabolcs Nagy <Szabolcs.Nagy@arm.com>
Subject: Re: [PATCH v16 12/16] IB, arm64: untag user pointers in ib_uverbs_(re)reg_mr()
Date: Tue, 4 Jun 2019 15:09:26 +0200 [thread overview]
Message-ID: <CAAeHK+xBxDB-OBuzPDcNaTHCNJqu6djHwqoVGSYpxG33w-YR9g@mail.gmail.com> (raw)
In-Reply-To: <20190604130207.GD15385@ziepe.ca>
On Tue, Jun 4, 2019 at 3:02 PM Jason Gunthorpe <jgg@ziepe.ca> wrote:
>
> On Tue, Jun 04, 2019 at 02:45:32PM +0200, Andrey Konovalov wrote:
> > On Tue, Jun 4, 2019 at 2:27 PM Jason Gunthorpe <jgg@ziepe.ca> wrote:
> > >
> > > On Tue, Jun 04, 2019 at 02:18:19PM +0200, Andrey Konovalov wrote:
> > > > On Mon, Jun 3, 2019 at 7:46 PM Jason Gunthorpe <jgg@ziepe.ca> wrote:
> > > > >
> > > > > On Mon, Jun 03, 2019 at 06:55:14PM +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.
> > > > > >
> > > > > > ib_uverbs_(re)reg_mr() use provided user pointers for vma lookups (through
> > > > > > e.g. mlx4_get_umem_mr()), which can only by done with untagged pointers.
> > > > > >
> > > > > > Untag user pointers in these functions.
> > > > > >
> > > > > > Signed-off-by: Andrey Konovalov <andreyknvl@google.com>
> > > > > > drivers/infiniband/core/uverbs_cmd.c | 4 ++++
> > > > > > 1 file changed, 4 insertions(+)
> > > > > >
> > > > > > diff --git a/drivers/infiniband/core/uverbs_cmd.c b/drivers/infiniband/core/uverbs_cmd.c
> > > > > > index 5a3a1780ceea..f88ee733e617 100644
> > > > > > +++ b/drivers/infiniband/core/uverbs_cmd.c
> > > > > > @@ -709,6 +709,8 @@ static int ib_uverbs_reg_mr(struct uverbs_attr_bundle *attrs)
> > > > > > if (ret)
> > > > > > return ret;
> > > > > >
> > > > > > + cmd.start = untagged_addr(cmd.start);
> > > > > > +
> > > > > > if ((cmd.start & ~PAGE_MASK) != (cmd.hca_va & ~PAGE_MASK))
> > > > > > return -EINVAL;
> > > > >
> > > > > I feel like we shouldn't thave to do this here, surely the cmd.start
> > > > > should flow unmodified to get_user_pages, and gup should untag it?
> > > > >
> > > > > ie, this sort of direction for the IB code (this would be a giant
> > > > > patch, so I didn't have time to write it all, but I think it is much
> > > > > saner):
> > > >
> > > > Hi Jason,
> > > >
> > > > ib_uverbs_reg_mr() passes cmd.start to mlx4_get_umem_mr(), which calls
> > > > find_vma(), which only accepts untagged addresses. Could you explain
> > > > how your patch helps?
> > >
> > > That mlx4 is just a 'weird duck', it is not the normal flow, and I
> > > don't think the core code should be making special consideration for
> > > it.
> >
> > How do you think we should do untagging (or something else) to deal
> > with this 'weird duck' case?
>
> mlx4 should handle it around the call to find_vma like other patches
> do, ideally as part of the cast from a void __user * to the unsigned
> long that find_vma needs
So essentially what we had a few versions ago
(https://lkml.org/lkml/2019/4/30/785) plus changing unsigned longs to
__user * across all IB code? I think the second part is something
that's not related to this series and needs to be done separately. I
can move untagging back to mlx4_get_umem_mr() though.
Catalin, you've initially asked to to move untagging out of
mlx4_get_umem_mr(), do you have any comments on this?
>
> Jason
next prev parent reply other threads:[~2019-06-04 13:09 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
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 [this message]
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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