From mboxrd@z Thu Jan 1 00:00:00 1970 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=-16.3 required=3.0 tests=DKIMWL_WL_MED,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH, MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT, USER_IN_DEF_DKIM_WL 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 22BF4C31E49 for ; Wed, 12 Jun 2019 11:44:05 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id F117A21734 for ; Wed, 12 Jun 2019 11:44:04 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="hBGTTVG6" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2438466AbfFLLoE (ORCPT ); Wed, 12 Jun 2019 07:44:04 -0400 Received: from mail-yw1-f73.google.com ([209.85.161.73]:35096 "EHLO mail-yw1-f73.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2438421AbfFLLn4 (ORCPT ); Wed, 12 Jun 2019 07:43:56 -0400 Received: by mail-yw1-f73.google.com with SMTP id p68so1345523ywp.2 for ; Wed, 12 Jun 2019 04:43:56 -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=YVD/WVehggR5Wc73HNU/6Lbl/J+rO7t+BXcE3PMRRDE=; b=hBGTTVG6ghhZ3+0guLELKJ8wGbky2Qh0tZY2BONpI+zCvbTSjhlIF7W0/JokOx5TzR VO5Rbf4FBD1McYuvKbubXsd/VFsD/O7BipMIP18RAMdpnsTMlCRbLlZbiP7oKXwSNsh/ 7N4rlsaJS9M2NXxtFUlEJJPsr6p+or/nlT4Zv12ZmDZup6gUVLdgoPgHeFDcpmGNRrjd 3ALIrSuYojaH/pslqsc0jXMozZhljZkCeYnT4XFg9eFUPMSJzEQdr0RcX9d6uIudOkk2 t4M2C4U//NS1sNKKoHlt+ReZpRZW4iLnE+17ISBaStJwmRniOrfV+Za5ClmC/tGhrMxn H1LA== 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=YVD/WVehggR5Wc73HNU/6Lbl/J+rO7t+BXcE3PMRRDE=; b=OUYad0I8Z0VdRiiwFyWWIZ56rbnjwSRAn80Ay+onVyQeJAOrIjqOD1bWwF3Sx64p2t 4pvMI2HRnrWTRK3b4Il82SnDNB7mhpwLrcnvcxgEaXMgpsF1H17AEtvMTK1GS+eCcRpU EuMsib/HcSphobUrxmBdbh34l0syxykKjAX0If7LdcCmzCVx5FWN8pP/WRBQ13Pde6S/ eL+cJwB8eWL2dfjxnWK/SuI9ZbmdkV4BL3io2mj9WzAH8TtGD6Rne23KT/c34hUNE0Pz iAMEOiUoWNq45kybAycmRoY4ResutKLH3aXwsqYwcE0xPYLJrkWKpG7nsFnKSH4VjN/S SSKA== X-Gm-Message-State: APjAAAW77zxhW3jF2Z1lo1MnSvIIoqSWxuogXN3/TeYRjmuL3bF74BBR xp/g7WSplst02bdfXRq2ocx6AQK5PERJ5pG0 X-Google-Smtp-Source: APXvYqzC8DIDqxpBDUE3Cs2MqoYPwBYxauFh78Yi9sE2QOVumKFBSV5WM5ycdrw0GZ9JIDvcxx34zgkY7MRSX6GJ X-Received: by 2002:a81:9947:: with SMTP id q68mr46506819ywg.197.1560339835908; Wed, 12 Jun 2019 04:43:55 -0700 (PDT) Date: Wed, 12 Jun 2019 13:43:23 +0200 In-Reply-To: Message-Id: <4c0b9a258e794437a1c6cec97585b4b5bd2d3bba.1560339705.git.andreyknvl@google.com> Mime-Version: 1.0 References: X-Mailer: git-send-email 2.22.0.rc2.383.gf4fbbf30c2-goog Subject: [PATCH v17 06/15] mm, arm64: untag user pointers in get_vaddr_frames 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 Content-Type: text/plain; charset="UTF-8" Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org This patch is a part of a series that extends arm64 kernel ABI to allow to pass tagged user pointers (with the top byte set to something else other than 0x00) as syscall arguments. get_vaddr_frames uses provided user pointers for vma lookups, which can only by done with untagged pointers. Instead of locating and changing all callers of this function, perform untagging in it. Acked-by: Catalin Marinas Reviewed-by: Kees Cook Signed-off-by: Andrey Konovalov --- mm/frame_vector.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/mm/frame_vector.c b/mm/frame_vector.c index c64dca6e27c2..c431ca81dad5 100644 --- a/mm/frame_vector.c +++ b/mm/frame_vector.c @@ -46,6 +46,8 @@ int get_vaddr_frames(unsigned long start, unsigned int nr_frames, if (WARN_ON_ONCE(nr_frames > vec->nr_allocated)) nr_frames = vec->nr_allocated; + start = untagged_addr(start); + down_read(&mm->mmap_sem); locked = 1; vma = find_vma_intersection(mm, start, start + 1); -- 2.22.0.rc2.383.gf4fbbf30c2-goog