From patchwork Mon May 6 16:30:54 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Andrey Konovalov X-Patchwork-Id: 10931413 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 8EF541575 for ; Mon, 6 May 2019 16:31:35 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 7CBCE287EA for ; Mon, 6 May 2019 16:31:35 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 7021D28847; Mon, 6 May 2019 16:31:35 +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 20872287EA for ; Mon, 6 May 2019 16:31:35 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727123AbfEFQbd (ORCPT ); Mon, 6 May 2019 12:31:33 -0400 Received: from mail-qk1-f202.google.com ([209.85.222.202]:56095 "EHLO mail-qk1-f202.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727108AbfEFQbc (ORCPT ); Mon, 6 May 2019 12:31:32 -0400 Received: by mail-qk1-f202.google.com with SMTP id l4so14914893qke.22 for ; Mon, 06 May 2019 09:31:32 -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=9noxdAH/DJOJ2FYayyiyYQz8DnKHvszaUU/XpncZrgo=; b=Gh9uHUEwhI8X3KH3oum4TP3+K5YcLVeFgNxy28sxooe9hD0KxqO+/9bu9ASe+gwO9m +npnzk9MzBx/G95AnHz8npJA2JLqfUYczohkOpf1cDAEGWB/X7jH7ATuoeQyoUMeyaJE M+s2UJpwoXBo6kJQ8MvPZRd/OM9IAl3ZUMX+L/PvePvsqcjFIcb/KoU1n2dvqK/g4dyS WX9LAM4MfJzSphXX3HTjOHZ2WfucwXBSdBhXaGaeltxjREoqu7g25XXVhrt4uPYNQRup Pi925C63hraEJZZpZwP5S6UZPdegfoPkW1yuXxVcy9QEkU3hg9EUu8QmKcerWhcvmd7i pz0w== 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=9noxdAH/DJOJ2FYayyiyYQz8DnKHvszaUU/XpncZrgo=; b=ZB1RPrXRFdEN2YKnZW4KVTCSQZkprVlS1wZqniQIC2ml5mySSqAXf6RyiWh5IZA2lp ymGO1UtnGn4pJNtzzQJAM1Zx8ERKWo6dh//dn5FjUKPUhPiBSg+pOd3b1NemAL3i/7Ne rUi8rDMY7U2gZyzZfIa2s5oRXgCUX+lMLCZBFmNUcIBea0OhULpCJ0guUUfRSwxuy89o bSq6x1i6PsgaC9En6atnv0Qk1AYirJot5lifAp5swC+RVxEkKXSLWatMwtIwM+3hxhKJ FHHV0HSnc4p/NwPahOHivPDOgCEzLbfaD+T15PmkoCgrUJuSyPDHDI2VdsWPGryGeWTo B1EA== X-Gm-Message-State: APjAAAXh1eVRvG89ibNHSu+3VNtL+79l/5jRCKiNvJKpggIoiD11E/tM sAIhq1Qk5czl7LNxei6D16/fE40QGYBdbGdV X-Google-Smtp-Source: APXvYqxoF+XMyoqlEFPsaust8CXG+VIOr8CluDz21rRB5hrxS5C2Phu1lQB5er/vngGdw0Qf3GTM8MJuymHjvFcO X-Received: by 2002:ad4:540b:: with SMTP id f11mr5876305qvt.42.1557160291702; Mon, 06 May 2019 09:31:31 -0700 (PDT) Date: Mon, 6 May 2019 18:30:54 +0200 In-Reply-To: Message-Id: Mime-Version: 1.0 References: X-Mailer: git-send-email 2.21.0.1020.gf2820cf01a-goog Subject: [PATCH v15 08/17] 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 , Dmitry Vyukov , Kostya Serebryany , Evgeniy Stepanov , Lee Smith , Ramana Radhakrishnan , Jacob Bramley , Ruben Ayrapetyan , Robin Murphy , Luc Van Oostenryck , Dave Martin , Kevin Brodsky , Szabolcs Nagy , Andrey Konovalov Sender: linux-media-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP 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. 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);