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=-16.5 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_PASS,T_DKIMWL_WL_MED,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 A4E94C04A6B for ; Mon, 6 May 2019 16:31:36 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 764E120B7C for ; Mon, 6 May 2019 16:31:36 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="Gh9uHUEw" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727133AbfEFQbf (ORCPT ); Mon, 6 May 2019 12:31:35 -0400 Received: from mail-qk1-f201.google.com ([209.85.222.201]:54609 "EHLO mail-qk1-f201.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727050AbfEFQbc (ORCPT ); Mon, 6 May 2019 12:31:32 -0400 Received: by mail-qk1-f201.google.com with SMTP id k68so14959387qkd.21 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=LlY0l9SwwDeT4pNq0ZnI7/evKGmc1e/YqsKVRVzuGXcxucafH8LvH1a4vs8Jce6qjs STK69pviN1zrnZkhRwS4DYlwuLa0E88i/V5F+Npg7oJ18SUtrN5MWJkaXIwuFtQPvam9 vox8lM+5e3sBZFt6M1brgGXkCNbMmloCEDZNnvYnsL6rwWiVDsQr3LdgC/IHMWbTwJ+r IDizVXxwHKodndoGDt5iyptYG/Age4t2vvguEG1VbTvHqDpGdWKgifBrRoy0GYC7pJ+Z LbmaFugF4Ln1XR/XFFgf8MFnOn799FF8+1J3fn7vdRxnyH/sAEQRK/erW+5zl8G4IoCn X7WA== X-Gm-Message-State: APjAAAVCkzkLnRBzU+gfuTljywJZfJ+LZ3Ftx9AYnZ2D/n5J2ies9+pB gox7uDRcBLPMHHnaY1II20m06MsZvURNc+uC 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 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. 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); -- 2.21.0.1020.gf2820cf01a-goog