From patchwork Tue Apr 30 13:25:04 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Andrey Konovalov X-Patchwork-Id: 10923585 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 0E09515A6 for ; Tue, 30 Apr 2019 13:27:28 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id F12DC28A63 for ; Tue, 30 Apr 2019 13:27:27 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id E4D6728AE7; Tue, 30 Apr 2019 13:27:27 +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 93ADE28AF7 for ; Tue, 30 Apr 2019 13:27:27 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727817AbfD3N11 (ORCPT ); Tue, 30 Apr 2019 09:27:27 -0400 Received: from mail-vk1-f201.google.com ([209.85.221.201]:35290 "EHLO mail-vk1-f201.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728370AbfD3NZn (ORCPT ); Tue, 30 Apr 2019 09:25:43 -0400 Received: by mail-vk1-f201.google.com with SMTP id s139so2571349vkf.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=g6659qt0zXjZvSiw8AYo4qowcE6bzcxYoKYz2XaHSCBaSDnEFSSOX/XYylaDAJY1a0 HNZXgeFvHFQ7ZR1+D1P+YR0SloKldt8xr6bwFbKAyVPICiz/gudpACSvGPPQk8g7RDtw Tr777YvLAUYgHcqBB8U5EWHKraPyOYEKJx3m7O3ISMBP8xP6zGf7eob6QzK9S2MMmuE5 y3D5xHqa8k9WDEgqjXX2iJ5pTDw9RBe67fw0zBAqaID83TMXAZE7GDlOLtr/KDWGjl9b P8txvnK8YPEFs6kPZrEXelRNmi469+8rQxS5vfCZZO4Tbcd2jREyhUZADNAD55c81QIP euXQ== X-Gm-Message-State: APjAAAWkDhAqNSxJVH3YYuwU/eA3d2o/4SC/pbJGAhtPfDe1Pvk0R4o3 fPNuWtQMmpAAVnIIfHaRxcaURwZL4MrXvbvS 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 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 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);