From patchwork Mon Jun 24 14:32:51 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Andrey Konovalov X-Patchwork-Id: 11013453 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 1C6BB186E for ; Mon, 24 Jun 2019 14:34:43 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 0E14728BEB for ; Mon, 24 Jun 2019 14:34:43 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 0BC1528C00; Mon, 24 Jun 2019 14:34:43 +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 971D128BF8 for ; Mon, 24 Jun 2019 14:34:42 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729232AbfFXOd1 (ORCPT ); Mon, 24 Jun 2019 10:33:27 -0400 Received: from mail-vk1-f202.google.com ([209.85.221.202]:38033 "EHLO mail-vk1-f202.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729185AbfFXOdY (ORCPT ); Mon, 24 Jun 2019 10:33:24 -0400 Received: by mail-vk1-f202.google.com with SMTP id u202so6487540vku.5 for ; Mon, 24 Jun 2019 07:33:23 -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=6wOlIN9RCqtC4EMjbsO9NIyMZhz6XW377zGYJAhhjSw=; b=EdyxEJFnWG9rQS7GXNgeJyNTxEu5LtqPTYYbN/QLe+5zlbDexboGyDqBC815Hrokjj qfAzqSeaTKPFvVv9WWYIndqnAPiRljjB3TIDjGP/0IMssQbdVP4BzrpsfzCXDKI9BDHt WeSswvJDxczfbCTt3IQqYPH1jX0VOQ5O+GZOEn825FLst0HqKs8RjnFS0DrDqqOlKlcm +N5mzxkUilj5uw0wDqYjDhK1/db8t8dLQzbwnNuEhal4y8tjJfxP9svgAu0LB4ORTyVD OZMU426HgS0vYo8hjqCwVk8ERda/jHZQ5JXLr2v38JKqFFajbtzb+/rl5BB+KXJN5rjD 80IA== 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=6wOlIN9RCqtC4EMjbsO9NIyMZhz6XW377zGYJAhhjSw=; b=sRwSTMvpruSOp3rRUHKE30D4QDy6oKsQ903TmHJwu4uttYIPQ92lIJkx4GT7tXTH4U AXIG1s+mKmfsu/yPx9rYUmUnwzhnrnxyyy+1w070vr+sbzeG/W0R5SNCxt+73+dIvFX9 GY03X9iZQbNJ/SnmWVE90b6T4seXLaquy7K+sBHfCMQZT8wzd90maTZ+WdpanYGlqyTB /IPdsz3m806Nhd6eHUEMgfyFzLckSjiOxiQv6zqtVoi9Gi4l6QvWUk7cHq0GpTocUwQA CuPlrzwgunLSlNz8I41htHOWHvgzz31QaWA7h8UmMG2Gu1W7+LrVRXFKbOf8zGhKicIa Gj5A== X-Gm-Message-State: APjAAAXHPedpbEafXi8BxBGeiJdKdIoBxxZZ8gPG2nCvrVy+Sditog7x wFcid3QERcFnpfuOSUdW17fi4iuJ0ZcEdo0v X-Google-Smtp-Source: APXvYqypfx2HThdGezp/oUedjYKv44Fb8n5lNK45oyS/vOtxc58Rwt4c9Y+yK17e0xs6J7fV+AYN9l/kG2KmENab X-Received: by 2002:ab0:5c8:: with SMTP id e66mr54849002uae.10.1561386803022; Mon, 24 Jun 2019 07:33:23 -0700 (PDT) Date: Mon, 24 Jun 2019 16:32:51 +0200 In-Reply-To: Message-Id: Mime-Version: 1.0 References: X-Mailer: git-send-email 2.22.0.410.gd8fdbe21b5-goog Subject: [PATCH v18 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: 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. 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);