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=-16.6 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_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 BB644C43219 for ; Tue, 30 Apr 2019 13:27:23 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 869D221734 for ; Tue, 30 Apr 2019 13:27:23 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="wBxzW9uz" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728628AbfD3N1W (ORCPT ); Tue, 30 Apr 2019 09:27:22 -0400 Received: from mail-ua1-f73.google.com ([209.85.222.73]:34947 "EHLO mail-ua1-f73.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728368AbfD3NZn (ORCPT ); Tue, 30 Apr 2019 09:25:43 -0400 Received: by mail-ua1-f73.google.com with SMTP id e8so1927650ual.2 for ; Tue, 30 Apr 2019 06:25:42 -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=4c/fu3qC3Skvw+ZZk7UHJQzalE9hfnOxHloiMgOUfYw=; b=wBxzW9uz5sqQEs2k0kS4yhvkUsLQPUol5yYuscC/EhJQq88IJKN51oJN9Ma9N+F87j 0yaXqLxOKrSBWEzg6TAlDuogkZNA4XMbprAL12kWJ8MdNH7JIvTO8ZRXCqw/W9rKaVTK 0th2TjbWtiytISvyVjLE74X1hS0zo7K7eSu+m53APk0oWFg+5hHivN//aHp583NOkYkp q/Xzdqo7lpDQuozd8M9soPmozGOH2C019sBJyK9gvXzEw1QU7pl845OD9URqwv3Lf0aM RmLDFBkc4rSunB/Q4UnHBTaxv0r2wOX1jQXVnW4MBVL+0daNYML4EK5a4hKos8NfLzsy dlFw== 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=4c/fu3qC3Skvw+ZZk7UHJQzalE9hfnOxHloiMgOUfYw=; b=cIqnx2poZdXNn55R9CDhzAqrtXsS8NQVtAauGMt64d4/szRMJGmOkcx9RZmx9n55s9 pT9GS1kts9uYAWQEasHp5EwO10F9cFWaVpTIJx5LDmsIwD8HQtUU4Fja4hZj8fPAtij1 DdbmjxtqwxqTIbfCS9LLi3/rseSZrI6t/5JTPvwK0ahjTjPzg+BeVoIgzV00Co6QpP7k KVjuhx4vsT7FgS7iJWalM2D7+2T/ozST/ZIGZ3aVxpHWtgx9C8tDR3NEn6O4dtcLhsUi Ms+Q+Tz+zjH77u0q08qOU9mr4vC7V+5Ax6Uq9SjICeQXi8185yDm0KCacDSlBQ8Vz9r8 pySQ== X-Gm-Message-State: APjAAAXIvMmYHsEYSF5ITpy7SSj+9fyIdLdqP4vsGas3K5ldpliBboB+ M9hkJjwI1dMc1Td97ysXmcIiC2IPms60JNYo X-Google-Smtp-Source: APXvYqx4TL4lB6fuuHN3vQZgSBJDs10/R98gvbNQDm51wxIVMnZyNgUuaizbdtdyYw1MeWbTLc+s/luHbNJTgZgZ X-Received: by 2002:a67:8155:: with SMTP id c82mr6290812vsd.200.1556630742131; Tue, 30 Apr 2019 06:25:42 -0700 (PDT) Date: Tue, 30 Apr 2019 15:25:04 +0200 In-Reply-To: Message-Id: <8e20df035de677029b3f970744ba2d35e2df1db3.1556630205.git.andreyknvl@google.com> Mime-Version: 1.0 References: X-Mailer: git-send-email 2.21.0.593.g511ec345e18-goog Subject: [PATCH v14 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 , Kuehling@google.com, Felix , Deucher@google.com, Alexander , Koenig@google.com, Christian , 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 , Chintan Pandya , 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); -- 2.21.0.593.g511ec345e18-goog