From patchwork Mon Jun 24 14:32:59 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Andrey Konovalov X-Patchwork-Id: 11013385 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 ADAE2924 for ; Mon, 24 Jun 2019 14:33:53 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 9D85F28BE2 for ; Mon, 24 Jun 2019 14:33:53 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 9158628BF5; Mon, 24 Jun 2019 14:33:53 +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 3059628BEE for ; Mon, 24 Jun 2019 14:33:53 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729744AbfFXOdw (ORCPT ); Mon, 24 Jun 2019 10:33:52 -0400 Received: from mail-vk1-f201.google.com ([209.85.221.201]:33385 "EHLO mail-vk1-f201.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729815AbfFXOdv (ORCPT ); Mon, 24 Jun 2019 10:33:51 -0400 Received: by mail-vk1-f201.google.com with SMTP id 63so2726213vki.0 for ; Mon, 24 Jun 2019 07:33:51 -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=/YALAWfXM1Ec4B1lOAT/D+NA+cyFiVncn64tZ/r98OM=; b=Ql48XStLri/shxEZnh2m2bPKZuWW0LbLVZb7Ke39XzoW6tnlHJqvY/w3tAOiQXd+HY +m0w0vy4Nc92IOCtwaAefDtVWKaMPae0qEokqCFh/15Etg3mPj9l+0y/QojMsq+32GDL FCc4x1guuctj7Dh9w2rpqoJJMnqXSJhRdYAnuBaH1m5ApCPzHjNZOJsEgqVYOMqcq1IK z4bmcgqikB0YNciNmYj3+oZnFq+Z3IRAKc7+MbjrKJ0m2yo/N7qQZlR4Wduu+I3SYaAM An3oELmPbKJBGAW9gnsznPT0Ku3QQIngN9+ygpAFQEEHuUfYflrAf46HUzwiWP0xvwhX EWWA== 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=/YALAWfXM1Ec4B1lOAT/D+NA+cyFiVncn64tZ/r98OM=; b=FHPBFJPujVmyvoq85/HrWXJA4jltmPbAhykaA3Ae2oxqkrrjL/jFSbkQhrS8Ki0Keu fDREOhtJBSRZNZmibAmNJ1ppJ1J7XbKRkF2ZXH4sxx364rpeglVIdizoLRPjXwv35JyX DETEgDPAMn5tCJWIOI7Z/GT61uZgsOhg0TiUSLJxue453mp/FjvqegmmvpuBtflpPuc9 8jqfzgwWem1A2bntw5BkMnn37ANKcXlnC5M6WAZ1ZmG0S8ryPIGCuHALseNIVyillB02 Bw+221G7zbJT+ejpoyXu1vqTwXqv2dAoVamKJivdlhOwaoQnuhJQPxc9ijefKhd9EIhv Pozw== X-Gm-Message-State: APjAAAVDWSTrAAPoQzeiw8UPi45B4CIekwnn/xFW6WGlKcLhZGnW4wQd A/28HcX7d591xtL4cdxhE8cjfcp2fH5tR8FS X-Google-Smtp-Source: APXvYqzcPL+MfuI0G9Nd/HSZW5720Hxob5Qe3sb32I8/yavc0Ub0kNUbvXmDnUxRuwL2tRyo+O0TaelZxw+BF2mv X-Received: by 2002:a1f:7dc2:: with SMTP id y185mr1688822vkc.51.1561386830607; Mon, 24 Jun 2019 07:33:50 -0700 (PDT) Date: Mon, 24 Jun 2019 16:32:59 +0200 In-Reply-To: Message-Id: <125994bfab8f29da8f58c8fcd0d94ef4bf55b3ea.1561386715.git.andreyknvl@google.com> Mime-Version: 1.0 References: X-Mailer: git-send-email 2.22.0.410.gd8fdbe21b5-goog Subject: [PATCH v18 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: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@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 add34adfadc7..7b8283e33d10 100644 --- a/drivers/vfio/vfio_iommu_type1.c +++ b/drivers/vfio/vfio_iommu_type1.c @@ -381,6 +381,8 @@ 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) {