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: 10931519 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 2962B14DB for ; Mon, 6 May 2019 16:33:03 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 18A9A286AA for ; Mon, 6 May 2019 16:33:03 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 03F0028847; Mon, 6 May 2019 16:33:03 +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 A9645286AA for ; Mon, 6 May 2019 16:33:02 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727124AbfEFQbd (ORCPT ); Mon, 6 May 2019 12:31:33 -0400 Received: from mail-qk1-f202.google.com ([209.85.222.202]:43598 "EHLO mail-qk1-f202.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727107AbfEFQbc (ORCPT ); Mon, 6 May 2019 12:31:32 -0400 Received: by mail-qk1-f202.google.com with SMTP id p190so7306622qke.10 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=bEPntIYbvUz+WdRYTfMfBFAxDAkCriWKbh4nvfeyWstYJ7jzr1oInbQ9YkMYNoDssf DuOtml9Wan6BSw/+omvTKoFGoq2ejUziH/PgLUNUXJ7Q/dJyhaX+1DnzS9CNp7Ix4gOM V8X7QBYvkjI7Wg60IbVoYKIIV65uCrnK5RsJeNhoBAxhgsUZQrLdKzNzcPLi2Qr25s0v s+G8rQXDKhNaf3yjPU4nFuiRYqL0g3arVJKRk5fNwao/qFlQUG7zGSiKK5Y2wIQejy8x Y2v+aZDWfu/G87+c2d9R8tRqNsCfDW+CvXMjuo8I2GmvSqgArati2PDyaAJnN9X7aOFY ZNVA== X-Gm-Message-State: APjAAAWdGGkIhvcoQP8rXE/eOTXj30AEcpKdFSm/D9Hfy608CZnFegCU 7OCK5i55HYZEYJbTcLAHFPgZZqnkiWRTjMOc 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: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@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);