From patchwork Thu Nov 19 14:41:29 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Daniel Vetter X-Patchwork-Id: 11917839 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-13.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 9E389C6369E for ; Thu, 19 Nov 2020 14:45:16 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 3882722253 for ; Thu, 19 Nov 2020 14:45:16 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=ffwll.ch header.i=@ffwll.ch header.b="QsUGwdze" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728200AbgKSOl4 (ORCPT ); Thu, 19 Nov 2020 09:41:56 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:37384 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728192AbgKSOlz (ORCPT ); Thu, 19 Nov 2020 09:41:55 -0500 Received: from mail-wr1-x441.google.com (mail-wr1-x441.google.com [IPv6:2a00:1450:4864:20::441]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 0C460C0617A7 for ; Thu, 19 Nov 2020 06:41:54 -0800 (PST) Received: by mail-wr1-x441.google.com with SMTP id o15so6702946wru.6 for ; Thu, 19 Nov 2020 06:41:53 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ffwll.ch; s=google; h=from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; bh=0+QV0eroCOghP6iF2qF6VQojb/qmwXTdLdxbXgSm38Q=; b=QsUGwdzetI9prZKoeP2iAhcymfOD+I5vw5uQlsYPHXPJ6OfnoBMufDTFzZUJjNMLZ9 Yxrnkb3r0QOgb8tbJN+frKR3E7076su7FmADL1RedADyOMYsxHMJ1LuezxqfJ+4zvmNr w6i7QaH+qoovsm/gkgX6mzTZtHLEyBkDPfyDk= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; bh=0+QV0eroCOghP6iF2qF6VQojb/qmwXTdLdxbXgSm38Q=; b=niQis4EmSesJ4JS/RDYeX8M8hdys4Hi7YttPUwfQEsjkqKdxqH0kcdAjxTKKucNfSA J0o4e8/1cPKGTERbyUbNBstnXP7mprCy1PTZcJm8nB7PJe7SA5VF1tBS0nt5DNq/Taz0 f+Q26hYSXVsuct6T12BCbSHyirtkYO8a+WzXcnlWDZWQTqVV7azuCdJDFVdZhX+OOALA yw/byB6vit/I04oCFU3LT0w3t345mC4gjkMs4MPMNr/xMV32iS76tj7+umJrlrm5i3d2 As2dH1/rxTfExR7/O/3cM4h151MM/sioPG5NUd0ZX4Sj6rdb3CoQgiB1joTZLDyM/aTm A9bg== X-Gm-Message-State: AOAM5304G3sKqZ3EWgknWeIDpAniJGlsab0gZCgXdyrwz18vCbdC1Ih0 q7Nji/pNvGxti1NAzxazWLGDwA== X-Google-Smtp-Source: ABdhPJwEr0+MWxW25HcjQdBlrf+fNcxCL3BoIHGbwL4k+zwCdrQxRdMboyjz6DNXtMlDrKrjaCEFzw== X-Received: by 2002:a5d:4947:: with SMTP id r7mr9987226wrs.50.1605796912703; Thu, 19 Nov 2020 06:41:52 -0800 (PST) Received: from phenom.ffwll.local ([2a02:168:57f4:0:efd0:b9e5:5ae6:c2fa]) by smtp.gmail.com with ESMTPSA id x63sm51292wmb.48.2020.11.19.06.41.51 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 19 Nov 2020 06:41:51 -0800 (PST) From: Daniel Vetter To: DRI Development , LKML Cc: kvm@vger.kernel.org, linux-mm@kvack.org, linux-arm-kernel@lists.infradead.org, linux-samsung-soc@vger.kernel.org, linux-media@vger.kernel.org, Daniel Vetter Subject: [PATCH v6 00/17] follow_pfn and other iomap races Date: Thu, 19 Nov 2020 15:41:29 +0100 Message-Id: <20201119144146.1045202-1-daniel.vetter@ffwll.ch> X-Mailer: git-send-email 2.29.2 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-samsung-soc@vger.kernel.org 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/ v5: https://lore.kernel.org/dri-devel/20201030100815.2269-1-daniel.vetter@ffwll.ch/ And the discussion that sparked this journey: https://lore.kernel.org/dri-devel/20201007164426.1812530-1-daniel.vetter@ffwll.ch/ Unfortunately took way longer to update than I hoped, I got sidetracked with a few things. Changes in v6: - Tested v4l userptr as Tomasz suggested. No boom observed - Added RFC for locking down follow_pfn, per discussion with Christoph and Jason. - Explain why pup_fast is safe in relevant patches, there was a bit a confusion when discussing v5. - Fix up the resource patch, with CONFIG_IO_STRICT_DEVMEM it crashed on boot due to an unintended change (reported by John) 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 (17): 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 RFC: kvm: pass kvm argument to follow_pfn callsites RFC: mm: add mmu_notifier argument to follow_pfn arch/powerpc/kvm/book3s_64_mmu_hv.c | 2 +- arch/powerpc/kvm/book3s_64_mmu_radix.c | 2 +- arch/powerpc/kvm/e500_mmu_host.c | 2 +- arch/x86/kvm/mmu/mmu.c | 8 +- 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/kvm_host.h | 9 +- include/linux/mm.h | 50 +------- include/linux/sysfs.h | 2 + include/media/frame_vector.h | 47 +++++++ include/media/videobuf2-core.h | 1 + kernel/resource.c | 98 ++++++++++++++- mm/Kconfig | 3 - mm/Makefile | 1 - mm/memory.c | 115 +++++++++++++++--- mm/nommu.c | 48 +++++++- security/Kconfig | 13 ++ virt/kvm/kvm_main.c | 56 +++++---- 33 files changed, 447 insertions(+), 298 deletions(-) rename {mm => drivers/media/common/videobuf2}/frame_vector.c (84%) create mode 100644 include/media/frame_vector.h