From patchwork Tue Jul 23 17:58:43 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Andrey Konovalov X-Patchwork-Id: 11054869 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 2FACB13A4 for ; Tue, 23 Jul 2019 17:59:31 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 213DD286C6 for ; Tue, 23 Jul 2019 17:59:31 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 13363286E0; Tue, 23 Jul 2019 17:59:31 +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 F0FE0286C8 for ; Tue, 23 Jul 2019 17:59:29 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2391310AbfGWR72 (ORCPT ); Tue, 23 Jul 2019 13:59:28 -0400 Received: from mail-vk1-f202.google.com ([209.85.221.202]:54277 "EHLO mail-vk1-f202.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2391293AbfGWR71 (ORCPT ); Tue, 23 Jul 2019 13:59:27 -0400 Received: by mail-vk1-f202.google.com with SMTP id l7so43948vkm.21 for ; Tue, 23 Jul 2019 10:59:26 -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=/huzVrn6iDinNK3gESNF6fMWuVj1J0a8E8YliY+JUMI=; b=Y7zAf+EqSsPzgFlPRtHiU2eaf3uvF3mBfxNqtK2dkyuo3VTBYXjjpviaGnsQe0yYUQ RZjdFooS3ZC7uUt58aVI/4cdpsAs60vswb3AsNKQ+PFZtVBvzHw5kY0TqkqeCmyj7riF mtQh5FnaNVG9iaAtW+G98/NdplTTfZ9IkSgAzb8usp7NHgKVNq41drkIZNhCHbFrZwbP oh8Z0GVIBTZb34XQapQJ/Cc8NMSc6thxgEsgQUYNQcR1lgRqwCY4KcosdJFpWo+DlmgQ eRBAMO05IGodFWFysR4D+7FGT50746wIbh4QySN2wsOGOenRi1KIej0OqRFaxZbG5kzF UnOg== 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=/huzVrn6iDinNK3gESNF6fMWuVj1J0a8E8YliY+JUMI=; b=mpBeEfQ/L0/uZj5DgSe6IyC5zh7r9sMfuNmyWj4kGinm33aou7CFBaxfZkqNO/yFQJ 35Zp/hlqiAGHJnN0fr2YSlPlpcS0dmXKSxrD3e/9M/KOVuaYa4y+Fp6Q8y05tSwqh4ty XHopP0CQP2M2v+cwhyWPie6tNit7pN8U4bXtsk48/p/Z3cdJOQrjeG1jnbOxZUtoeyAH 6npTwjA0HuMWfCLr0NOAoUyTjmMLEJIXN2bn/E97YqLXI72zuJ2pORopxkoxG37MpFYA aTEuy179RTTRHVe7jVLxfhavlAZNTLudc2g3y8DgEMxluarja6ZgVz8ZHABSm5E4QDVO 2B5Q== X-Gm-Message-State: APjAAAXegfPgalG6SSeWCaXhdyhIq32mNgPN60kDfpZ06GmeX8VBH+8T Yc3oryvtY0OarLUYd6GhHn+83p8mE1DZD9kc X-Google-Smtp-Source: APXvYqza4RkKEiX9RSMJ4O0WeYRSe7jZPKwJC2E9aqA1oTke3kgtphbjO4en0GBzP/IdlZCHDhS+pYVnwN9x8xEl X-Received: by 2002:ab0:1c2:: with SMTP id 60mr34283049ual.78.1563904765450; Tue, 23 Jul 2019 10:59:25 -0700 (PDT) Date: Tue, 23 Jul 2019 19:58:43 +0200 In-Reply-To: Message-Id: <28f05e49c92b2a69c4703323d6c12208f3d881fe.1563904656.git.andreyknvl@google.com> Mime-Version: 1.0 References: X-Mailer: git-send-email 2.22.0.709.g102302147b-goog Subject: [PATCH v19 06/15] mm: 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 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. 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. Reviewed-by: Khalid Aziz Reviewed-by: Vincenzo Frascino 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);