From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail.linuxfoundation.org ([140.211.169.12]:36852 "EHLO mail.linuxfoundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751205AbdLDIsc (ORCPT ); Mon, 4 Dec 2017 03:48:32 -0500 Subject: Patch "mm: fail get_vaddr_frames() for filesystem-dax mappings" has been added to the 4.14-stable tree To: dan.j.williams@intel.com, akpm@linux-foundation.org, dledford@redhat.com, gregkh@linuxfoundation.org, hal.rosenstock@gmail.com, hch@lst.de, inki.dae@samsung.com, jack@suse.cz, jgg@mellanox.com, jmoyer@redhat.com, jy0922.shim@samsung.com, kyungmin.park@samsung.com, mchehab@kernel.org, mgorman@suse.de, ross.zwisler@linux.intel.com, sean.hefty@intel.com, sw0312.kim@samsung.com, torvalds@linux-foundation.org, vbabka@suse.cz Cc: , From: Date: Mon, 04 Dec 2017 09:48:32 +0100 Message-ID: <1512377312171137@kroah.com> MIME-Version: 1.0 Content-Type: text/plain; charset=ANSI_X3.4-1968 Content-Transfer-Encoding: 8bit Sender: stable-owner@vger.kernel.org List-ID: This is a note to let you know that I've just added the patch titled mm: fail get_vaddr_frames() for filesystem-dax mappings to the 4.14-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: mm-fail-get_vaddr_frames-for-filesystem-dax-mappings.patch and it can be found in the queue-4.14 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let know about it. >>From b7f0554a56f21fb3e636a627450a9add030889be Mon Sep 17 00:00:00 2001 From: Dan Williams Date: Wed, 29 Nov 2017 16:10:39 -0800 Subject: mm: fail get_vaddr_frames() for filesystem-dax mappings From: Dan Williams commit b7f0554a56f21fb3e636a627450a9add030889be upstream. Until there is a solution to the dma-to-dax vs truncate problem it is not safe to allow V4L2, Exynos, and other frame vector users to create long standing / irrevocable memory registrations against filesytem-dax vmas. [dan.j.williams@intel.com: add comment for vma_is_fsdax() check in get_vaddr_frames(), per Jan] Link: http://lkml.kernel.org/r/151197874035.26211.4061781453123083667.stgit@dwillia2-desk3.amr.corp.intel.com Link: http://lkml.kernel.org/r/151068939985.7446.15684639617389154187.stgit@dwillia2-desk3.amr.corp.intel.com Fixes: 3565fce3a659 ("mm, x86: get_user_pages() for dax mappings") Signed-off-by: Dan Williams Reviewed-by: Jan Kara Cc: Inki Dae Cc: Seung-Woo Kim Cc: Joonyoung Shim Cc: Kyungmin Park Cc: Mauro Carvalho Chehab Cc: Mel Gorman Cc: Vlastimil Babka Cc: Christoph Hellwig Cc: Doug Ledford Cc: Hal Rosenstock Cc: Jason Gunthorpe Cc: Jeff Moyer Cc: Ross Zwisler Cc: Sean Hefty Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds Signed-off-by: Greg Kroah-Hartman --- mm/frame_vector.c | 12 ++++++++++++ 1 file changed, 12 insertions(+) --- a/mm/frame_vector.c +++ b/mm/frame_vector.c @@ -53,6 +53,18 @@ int get_vaddr_frames(unsigned long start ret = -EFAULT; goto out; } + + /* + * While get_vaddr_frames() could be used for transient (kernel + * controlled lifetime) pinning of memory pages all current + * users establish long term (userspace controlled lifetime) + * page pinning. Treat get_vaddr_frames() like + * get_user_pages_longterm() and disallow it for filesystem-dax + * mappings. + */ + if (vma_is_fsdax(vma)) + return -EOPNOTSUPP; + if (!(vma->vm_flags & (VM_IO | VM_PFNMAP))) { vec->got_ref = true; vec->is_pfns = false; Patches currently in stable-queue which might be from dan.j.williams@intel.com are queue-4.14/mm-hugetlbfs-introduce-split-to-vm_operations_struct.patch queue-4.14/ib-core-disable-memory-registration-of-filesystem-dax-vmas.patch queue-4.14/mm-introduce-get_user_pages_longterm.patch queue-4.14/mm-fail-get_vaddr_frames-for-filesystem-dax-mappings.patch queue-4.14/device-dax-implement-split-to-catch-invalid-munmap-attempts.patch queue-4.14/v4l2-disable-filesystem-dax-mapping-support.patch queue-4.14/mm-fix-device-dax-pud-write-faults-triggered-by-get_user_pages.patch queue-4.14/mm-madvise.c-fix-madvise-infinite-loop-under-special-circumstances.patch