From patchwork Tue Jul 23 17:58:51 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Andrey Konovalov X-Patchwork-Id: 11054907 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 174AB13A4 for ; Tue, 23 Jul 2019 17:59:55 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 085CD286C8 for ; Tue, 23 Jul 2019 17:59:55 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id F03FA286F9; Tue, 23 Jul 2019 17:59:54 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-15.5 required=2.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,MAILING_LIST_MULTI,RCVD_IN_DNSWL_HI, USER_IN_DEF_DKIM_WL autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 9B6D7286C8 for ; Tue, 23 Jul 2019 17:59:54 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2388557AbfGWR7y (ORCPT ); Tue, 23 Jul 2019 13:59:54 -0400 Received: from mail-qt1-f202.google.com ([209.85.160.202]:34484 "EHLO mail-qt1-f202.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2391423AbfGWR7x (ORCPT ); Tue, 23 Jul 2019 13:59:53 -0400 Received: by mail-qt1-f202.google.com with SMTP id p34so39172927qtp.1 for ; Tue, 23 Jul 2019 10:59:52 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20161025; h=date:in-reply-to:message-id:mime-version:references:subject:from:to :cc; bh=bykoKqk+RfxIttYDE7/GdnEkPwV+NEF/LkGgW6aheBM=; b=t2L6A3co0IUcO5jJEupAYqmfSwA1Pmfl3+ZcIn/5Q85mp2WLmhw1iqLCswQ9as3aOF a0D+pYMEhkdmm+KSqXmSiU/lD0Pz3h6uvkPAeVEHs1IFoAwnv5BA1YbF3d7nwG6M8iRR Z5NEOhmfG5y3nopQ695DATYQQfXAIYJG7yd7F+lB9VoEza1F669VXhs6jrCa2pvOvN6l r1p+w7pUdDXihW/3CqVYzRnheU9A6fqtUiCr4NASapwor3nhJC+/jeMNYPGIPNIFjoFu E4g9GrA8tUOQtGrCF4JaEQ7hr5aZJYBDV43aYbaG/BPoNEA3mTX8DLrogiBkcDNJOYJ5 rrBA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:in-reply-to:message-id:mime-version :references:subject:from:to:cc; bh=bykoKqk+RfxIttYDE7/GdnEkPwV+NEF/LkGgW6aheBM=; b=fUf9WFTbpZmZB7rhxmEAaYHvehp8VqLyxrYDOnEDBcNwtcO1v6vnmxsuECV8CoOMRa EsUjCnnIjDyI7mJtWMI6SMhowpKSkNpaat78XEjFmyIp8QQMZqfmQMPGCRGL70hLpmGx Vb7+dpUZO0EW1PUOyVKkWm+LBn+ui+YuNaisnX45oBYSLIi1YLQlQQTXXwc0Vq4xKp97 v9DxZQld6A26fyhkeNEVsSwdc3UChNdKC5pK5YVhBMMs71Xpko47iBZNnuP82l9gJXJY DIbAWA9M1lx+p+eNIFFjlloauS1b6Lp8ETuGLfK7uY73WfrG72RlwZaN62Q/aAKs/HYB c1eg== X-Gm-Message-State: APjAAAVcVS/VZbUem/tVoi9OaxlJ+ljTZQSP3lPZxZJx3rBpXJy0cDcU L0jGwgw2QK4jagy75PUl3d3Gfe96dNmwNryf X-Google-Smtp-Source: APXvYqzy6KvMjkfI7Gkvl5k12zd++ICAyNUe8J8soJHrycJkzCW148ZA79khH20QvBebUrjeGJ/TSw9Gqxxo1fEA X-Received: by 2002:ac8:7251:: with SMTP id l17mr54199388qtp.277.1563904791730; Tue, 23 Jul 2019 10:59:51 -0700 (PDT) Date: Tue, 23 Jul 2019 19:58:51 +0200 In-Reply-To: Message-Id: <87422b4d72116a975896f2b19b00f38acbd28f33.1563904656.git.andreyknvl@google.com> Mime-Version: 1.0 References: X-Mailer: git-send-email 2.22.0.709.g102302147b-goog Subject: [PATCH v19 14/15] vfio/type1: untag user pointers in vaddr_get_pfn From: Andrey Konovalov To: linux-arm-kernel@lists.infradead.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, amd-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org, linux-rdma@vger.kernel.org, linux-media@vger.kernel.org, kvm@vger.kernel.org, linux-kselftest@vger.kernel.org Cc: Catalin Marinas , Vincenzo Frascino , Will Deacon , Mark Rutland , Andrew Morton , Greg Kroah-Hartman , Kees Cook , Yishai Hadas , Felix Kuehling , Alexander Deucher , Christian Koenig , Mauro Carvalho Chehab , Jens Wiklander , Alex Williamson , Leon Romanovsky , Luc Van Oostenryck , Dave Martin , Khalid Aziz , enh , Jason Gunthorpe , Christoph Hellwig , Dmitry Vyukov , Kostya Serebryany , Evgeniy Stepanov , Lee Smith , Ramana Radhakrishnan , Jacob Bramley , Ruben Ayrapetyan , Robin Murphy , Kevin Brodsky , Szabolcs Nagy , Andrey Konovalov , Eric Auger Sender: linux-kselftest-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kselftest@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP This patch is a part of a series that extends kernel ABI to allow to pass tagged user pointers (with the top byte set to something else other than 0x00) as syscall arguments. vaddr_get_pfn() uses provided user pointers for vma lookups, which can only by done with untagged pointers. Untag user pointers in this function. Reviewed-by: Eric Auger Reviewed-by: Vincenzo Frascino Reviewed-by: Catalin Marinas Reviewed-by: Kees Cook Signed-off-by: Andrey Konovalov --- drivers/vfio/vfio_iommu_type1.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/vfio/vfio_iommu_type1.c b/drivers/vfio/vfio_iommu_type1.c index 054391f30fa8..67a24b4d0fa4 100644 --- a/drivers/vfio/vfio_iommu_type1.c +++ b/drivers/vfio/vfio_iommu_type1.c @@ -368,6 +368,8 @@ static int vaddr_get_pfn(struct mm_struct *mm, unsigned long vaddr, down_read(&mm->mmap_sem); + vaddr = untagged_addr(vaddr); + vma = find_vma_intersection(mm, vaddr, vaddr + 1); if (vma && vma->vm_flags & VM_PFNMAP) {