From patchwork Wed Mar 20 14:51:20 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Andrey Konovalov X-Patchwork-Id: 1059311 X-Patchwork-Delegate: davem@davemloft.net Return-Path: X-Original-To: patchwork-incoming-netdev@ozlabs.org Delivered-To: patchwork-incoming-netdev@ozlabs.org Authentication-Results: ozlabs.org; spf=none (mailfrom) smtp.mailfrom=vger.kernel.org (client-ip=209.132.180.67; helo=vger.kernel.org; envelope-from=netdev-owner@vger.kernel.org; receiver=) Authentication-Results: ozlabs.org; dmarc=pass (p=reject dis=none) header.from=google.com Authentication-Results: ozlabs.org; dkim=pass (2048-bit key; unprotected) header.d=google.com header.i=@google.com header.b="A+JYGhZ3"; dkim-atps=neutral Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by ozlabs.org (Postfix) with ESMTP id 44PXyK5Yttz9sPb for ; Thu, 21 Mar 2019 01:54:49 +1100 (AEDT) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728464AbfCTOwH (ORCPT ); Wed, 20 Mar 2019 10:52:07 -0400 Received: from mail-ua1-f73.google.com ([209.85.222.73]:42837 "EHLO mail-ua1-f73.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728449AbfCTOwD (ORCPT ); Wed, 20 Mar 2019 10:52:03 -0400 Received: by mail-ua1-f73.google.com with SMTP id 32so218692uaf.9 for ; Wed, 20 Mar 2019 07:52:03 -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=o/tjHBN+YdVOHlZBhUHSY9iDnhLS0V50uWJeHP43be4=; b=A+JYGhZ3fQkhscb6lUBmQ1muz6oemHopDmPki/B278rzjZ0dk/UjohSsOxEu8keiCi W5/VXLZ67gUh0RZN3rq5skpPYsUC7oWDq+tl+3khHwdNxCrmhkhxq7w99dcsLgc3Elx7 dmeBy427vSPfFNaJS7DfUhAb/Fwd/EACn2TYRVMksoGnObzxZTWUPnBuSuAiS/JRvPZA f0EsOCj85jPSuENzq/Bg7zakYTOA4bo6fX1BKjPllZeRcF3GtXBJjjiVIF4U6HkOW9id X49/giQrlJvYsmuoQtVxMGCVLZT2pR3apmEVULZaKks3LsI2Ip7Pr6oRl+H4swKOnmZR D5tA== 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=o/tjHBN+YdVOHlZBhUHSY9iDnhLS0V50uWJeHP43be4=; b=YSj3JX6e1XldSv2VInGtRiEhYwrMVuyMwGu7osYhaswfboWv+s5NYKAW7I+UN1qKjs mD660PvHg9PPJLAldUB1fuUPJosfimE3lBVrjdfXuLX0zJ0Gjhr9kXdS0HOp3otqVZ8c eEWIzSvcuxUk2/KbA9RDaPMZc/yAdGLrUfrbVyZmLCBoD7CIzq1QasU4y29En+Fkn2K+ JKwX85//5Q1mnQDNYl0c2mRN/LigxV7Hk8cCqgHapHRkSqe3KKhwaIlu24XhpHbTbrHk BeFDtlq0UeqLXGtOWRPBI3XK/CH6pAqPx9lkl71RXz3TF4HGwBqeRE3QmTU44gGaoi2i eiQQ== X-Gm-Message-State: APjAAAXBtIV7K/rxgKzH149w9g1MDG5gSDi8VjyojaPc3jEnc8I5aS8j g3q1GIjFMbYKc4Aul3cc7HwCwI3b6SVJsREN X-Google-Smtp-Source: APXvYqyHOngs34In5uhQcXPzOfQqpf0ARHPrNyLHXpzz5ogONfScZvSMOj1YE9ihREsOQQ2kQeo8TqNX7xzilecW X-Received: by 2002:a67:7651:: with SMTP id r78mr6363022vsc.39.1553093522664; Wed, 20 Mar 2019 07:52:02 -0700 (PDT) Date: Wed, 20 Mar 2019 15:51:20 +0100 In-Reply-To: Message-Id: Mime-Version: 1.0 References: X-Mailer: git-send-email 2.21.0.225.g810b269d1ac-goog Subject: [PATCH v13 06/20] mm, arm64: untag user pointers in get_vaddr_frames From: Andrey Konovalov To: Catalin Marinas , Will Deacon , Mark Rutland , Robin Murphy , Kees Cook , Kate Stewart , Greg Kroah-Hartman , Andrew Morton , Ingo Molnar , "Kirill A . Shutemov" , Shuah Khan , Vincenzo Frascino , Eric Dumazet , "David S. Miller" , Alexei Starovoitov , Daniel Borkmann , Steven Rostedt , Ingo Molnar , Peter Zijlstra , Arnaldo Carvalho de Melo , Alex Deucher , "=?UTF-8?q?Christian=20K=C3=B6nig?=" , "David (ChunMing) Zhou" , Yishai Hadas , Mauro Carvalho Chehab , Jens Wiklander , Alex Williamson , linux-arm-kernel@lists.infradead.org, linux-mm@kvack.org, linux-arch@vger.kernel.org, netdev@vger.kernel.org, bpf@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, linux-kernel@vger.kernel.org Cc: Dmitry Vyukov , Kostya Serebryany , Evgeniy Stepanov , Lee Smith , Ramana Radhakrishnan , Jacob Bramley , Ruben Ayrapetyan , Chintan Pandya , Luc Van Oostenryck , Dave Martin , Kevin Brodsky , Szabolcs Nagy , Andrey Konovalov Sender: netdev-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: netdev@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);