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From: Daniel Vetter <daniel.vetter@ffwll.ch>
To: DRI Development <dri-devel@lists.freedesktop.org>,
	LKML <linux-kernel@vger.kernel.org>
Cc: linux-samsung-soc@vger.kernel.org, kvm@vger.kernel.org,
	Daniel Vetter <daniel.vetter@ffwll.ch>,
	linux-mm@kvack.org, linux-arm-kernel@lists.infradead.org,
	linux-media@vger.kernel.org
Subject: [PATCH v5 00/15] follow_pfn and other iomap races
Date: Fri, 30 Oct 2020 11:08:00 +0100	[thread overview]
Message-ID: <20201030100815.2269-1-daniel.vetter@ffwll.ch> (raw)

Hi all

Another update of my patch series to clamp down a bunch of races and gaps
around follow_pfn and other access to iomem mmaps. Previous version:

v1: https://lore.kernel.org/dri-devel/20201007164426.1812530-1-daniel.vetter@ffwll.ch/
v2: https://lore.kernel.org/dri-devel/20201009075934.3509076-1-daniel.vetter@ffwll.ch
v3: https://lore.kernel.org/dri-devel/20201021085655.1192025-1-daniel.vetter@ffwll.ch/
v4: https://lore.kernel.org/dri-devel/20201026105818.2585306-1-daniel.vetter@ffwll.ch/

And the discussion that sparked this journey:

https://lore.kernel.org/dri-devel/20201007164426.1812530-1-daniel.vetter@ffwll.ch/

Changes in v5:
- Tomasz found some issues in the media patches
- Polish suggested by Christoph for the unsafe_follow_pfn patch

Changes in v4:
- Drop the s390 patch, that was very stand-alone and now queued up to land
  through s390 trees.
- Comment polish per Dan's review.

Changes in v3:
- Bunch of polish all over, no functional changes aside from one barrier
  in the resource code, for consistency.
- A few more r-b tags.

Changes in v2:
- tons of small polish&fixes all over, thanks to all the reviewers who
  spotted issues
- I managed to test at least the generic_access_phys and pci mmap revoke
  stuff with a few gdb sessions using our i915 debug tools (hence now also
  the drm/i915 patch to properly request all the pci bar regions)
- reworked approach for the pci mmap revoke: Infrastructure moved into
  kernel/resource.c, address_space mapping is now set up at open time for
  everyone (which required some sysfs changes). Does indeed look a lot
  cleaner and a lot less invasive than I feared at first.

I feel like this is ready for some wider soaking. Since the remaining bits
are all kinda connnected probably simplest if it all goes through -mm.

Cheers, Daniel

Daniel Vetter (15):
  drm/exynos: Stop using frame_vector helpers
  drm/exynos: Use FOLL_LONGTERM for g2d cmdlists
  misc/habana: Stop using frame_vector helpers
  misc/habana: Use FOLL_LONGTERM for userptr
  mm/frame-vector: Use FOLL_LONGTERM
  media: videobuf2: Move frame_vector into media subsystem
  mm: Close race in generic_access_phys
  mm: Add unsafe_follow_pfn
  media/videbuf1|2: Mark follow_pfn usage as unsafe
  vfio/type1: Mark follow_pfn as unsafe
  PCI: Obey iomem restrictions for procfs mmap
  /dev/mem: Only set filp->f_mapping
  resource: Move devmem revoke code to resource framework
  sysfs: Support zapping of binary attr mmaps
  PCI: Revoke mappings like devmem

 drivers/char/mem.c                            |  86 +--------------
 drivers/gpu/drm/exynos/Kconfig                |   1 -
 drivers/gpu/drm/exynos/exynos_drm_g2d.c       |  48 ++++-----
 drivers/media/common/videobuf2/Kconfig        |   1 -
 drivers/media/common/videobuf2/Makefile       |   1 +
 .../media/common/videobuf2}/frame_vector.c    |  57 ++++------
 .../media/common/videobuf2/videobuf2-memops.c |   3 +-
 drivers/media/platform/omap/Kconfig           |   1 -
 drivers/media/v4l2-core/videobuf-dma-contig.c |   2 +-
 drivers/misc/habanalabs/Kconfig               |   1 -
 drivers/misc/habanalabs/common/habanalabs.h   |   6 +-
 drivers/misc/habanalabs/common/memory.c       |  50 ++++-----
 drivers/pci/pci-sysfs.c                       |   4 +
 drivers/pci/proc.c                            |   6 ++
 drivers/vfio/vfio_iommu_type1.c               |   4 +-
 fs/sysfs/file.c                               |  11 ++
 include/linux/ioport.h                        |   6 +-
 include/linux/mm.h                            |  47 +-------
 include/linux/sysfs.h                         |   2 +
 include/media/frame_vector.h                  |  47 ++++++++
 include/media/videobuf2-core.h                |   1 +
 kernel/resource.c                             | 101 +++++++++++++++++-
 mm/Kconfig                                    |   3 -
 mm/Makefile                                   |   1 -
 mm/memory.c                                   |  80 +++++++++++++-
 mm/nommu.c                                    |  27 ++++-
 security/Kconfig                              |  13 +++
 27 files changed, 360 insertions(+), 250 deletions(-)
 rename {mm => drivers/media/common/videobuf2}/frame_vector.c (84%)
 create mode 100644 include/media/frame_vector.h

-- 
2.28.0

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             reply	other threads:[~2020-10-30 10:08 UTC|newest]

Thread overview: 59+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-10-30 10:08 Daniel Vetter [this message]
2020-10-30 10:08 ` [PATCH v5 01/15] drm/exynos: Stop using frame_vector helpers Daniel Vetter
2020-10-30 10:08 ` [PATCH v5 02/15] drm/exynos: Use FOLL_LONGTERM for g2d cmdlists Daniel Vetter
2020-10-30 10:08 ` [PATCH v5 03/15] misc/habana: Stop using frame_vector helpers Daniel Vetter
2020-10-30 10:08 ` [PATCH v5 04/15] misc/habana: Use FOLL_LONGTERM for userptr Daniel Vetter
2020-10-30 10:08 ` [PATCH v5 05/15] mm/frame-vector: Use FOLL_LONGTERM Daniel Vetter
2020-10-30 14:11   ` Tomasz Figa
2020-10-30 14:37     ` Daniel Vetter
2020-11-02 18:19       ` Tomasz Figa
2020-10-31  2:55   ` John Hubbard
2020-10-31 14:45     ` Daniel Vetter
2020-11-01  5:22       ` John Hubbard
2020-11-01 10:30         ` Daniel Vetter
2020-11-01 21:13           ` John Hubbard
2020-11-01 22:50             ` Daniel Vetter
2020-11-04 14:00               ` Jason Gunthorpe
2020-11-04 15:54                 ` Daniel Vetter
     [not found]                   ` <20201104162125.GA13007@infradead.org>
2020-11-04 16:26                     ` Daniel Vetter
     [not found]                       ` <20201104163758.GA17425@infradead.org>
     [not found]                         ` <20201104164119.GA18218@infradead.org>
2020-11-04 18:17                           ` Jason Gunthorpe
2020-11-04 18:44                             ` John Hubbard
2020-11-04 19:02                               ` Jason Gunthorpe
2020-11-05  9:25                               ` Daniel Vetter
2020-11-05 12:49                                 ` Jason Gunthorpe
2020-11-06  4:08                                   ` John Hubbard
2020-11-06 10:01                                     ` Daniel Vetter
2020-11-06 10:27                                       ` Daniel Vetter
2020-11-06 12:55                                         ` Jason Gunthorpe
2020-11-09  8:44                                           ` Thomas Hellström
2020-11-09 20:19                                             ` Jason Gunthorpe
2020-11-06 12:58                                       ` Jason Gunthorpe
2020-10-30 10:08 ` [PATCH v5 06/15] media: videobuf2: Move frame_vector into media subsystem Daniel Vetter
2020-10-30 10:08 ` [PATCH v5 07/15] mm: Close race in generic_access_phys Daniel Vetter
2020-10-30 10:08 ` [PATCH v5 08/15] mm: Add unsafe_follow_pfn Daniel Vetter
     [not found]   ` <20201102072931.GA16419@infradead.org>
2020-11-02 12:56     ` Daniel Vetter
2020-11-02 13:01       ` Jason Gunthorpe
2020-11-02 13:23         ` Daniel Vetter
2020-11-02 15:52           ` Jason Gunthorpe
2020-11-02 16:42             ` Daniel Vetter
2020-11-02 17:16               ` Jason Gunthorpe
2020-10-30 10:08 ` [PATCH v5 09/15] media/videbuf1|2: Mark follow_pfn usage as unsafe Daniel Vetter
2020-10-30 10:08 ` [PATCH v5 10/15] vfio/type1: Mark follow_pfn " Daniel Vetter
2020-10-30 10:08 ` [PATCH v5 11/15] PCI: Obey iomem restrictions for procfs mmap Daniel Vetter
2020-11-03 21:28   ` Bjorn Helgaas
2020-11-03 22:09     ` Dan Williams
2020-11-04  8:44       ` Daniel Vetter
2020-11-04 16:50         ` Bjorn Helgaas
2020-11-04 20:12           ` Dan Williams
2020-11-05  9:34             ` Daniel Vetter
2020-10-30 10:08 ` [PATCH v5 12/15] /dev/mem: Only set filp->f_mapping Daniel Vetter
2020-10-30 10:08 ` [PATCH v5 13/15] resource: Move devmem revoke code to resource framework Daniel Vetter
2020-10-31  6:36   ` John Hubbard
2020-10-31 14:40     ` Daniel Vetter
2020-11-03  6:06   ` [resource] 22b17dc667: Kernel panic - not syncing: Fatal exception lkp
2020-11-03  6:15     ` John Hubbard
2020-11-03 10:10       ` Daniel Vetter
2020-10-30 10:08 ` [PATCH v5 14/15] sysfs: Support zapping of binary attr mmaps Daniel Vetter
2020-10-30 10:08 ` [PATCH v5 15/15] PCI: Revoke mappings like devmem Daniel Vetter
2020-10-30 19:22   ` Dan Williams
2020-11-03 21:30   ` Bjorn Helgaas

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