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=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=ham 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 5B6BCC04EB8 for ; Mon, 10 Dec 2018 12:51:24 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 2182220855 for ; Mon, 10 Dec 2018 12:51:24 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="o94crt9s" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 2182220855 Authentication-Results: mail.kernel.org; dmarc=fail (p=reject dis=none) header.from=google.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727856AbeLJMvW (ORCPT ); Mon, 10 Dec 2018 07:51:22 -0500 Received: from mail-wm1-f68.google.com ([209.85.128.68]:54772 "EHLO mail-wm1-f68.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727588AbeLJMvT (ORCPT ); Mon, 10 Dec 2018 07:51:19 -0500 Received: by mail-wm1-f68.google.com with SMTP id a62so3380303wmh.4 for ; Mon, 10 Dec 2018 04:51:16 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20161025; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=O6AqR+kzU7DWQeNGwKtE5aEN5/daSSLGL2wqVNM1I1o=; b=o94crt9sdWRW+Hm+QmVzs2SQOfXkb5I8ZA1YUWGR/rhiyXLta3D09PlbP8iJAgQz4P AaMOg13WCXc/3V43uJSupLTElnHz42/Ee7IzHa1JjP6TjqWFlUNN//X23cnby2HTY/og axjylPN+XFavkTnP0oGFHln3ZwFe2/juKQ5sJAgtxYNAFtsVDFeYuPsBQ0hII0bfcLEK XiMERt9XLjpmq8N8DJ1YK866L0D0OEONbAo9KCgz28iqGOX3iPjmbwdb16LAY28Asm+R C/Nun82fTDPABrkfsixYhSu9EPH9yIADCvsKOyVMjDxIqyFwkkJ/ZzoNiySiBB50PDA4 tGmQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=O6AqR+kzU7DWQeNGwKtE5aEN5/daSSLGL2wqVNM1I1o=; b=ThY2L9M8w/ZZPLl0goYi76k7aWB6ovRyGoQYiDfYx9J4MGpdSyI9wUryUiqpY34UrQ YUWIRZcBiscuaraALQmihisEPVZ0+q1gWilQmoNmJMvOj61ghdqnoxvdZ05AoJp17Vz6 biEiKhqp/30IrEo2iJEbR9xlxI3eZtd5tgDfr9juvvU5spl2M7eYOhNFuEiFa/9qO8/l qGIqpkfnMc7SKNUCEitaYBCOWV7MwIdjGRiG2Vs4UHZscZhY4Npnwa3A/DRYYKIH3DRD +8Hkk68+/kgjChP+7Zvk0leljTsHYwE4tUpnzq57AspW5u/RRrLrdKQOT6VyBDps790J 4p1g== X-Gm-Message-State: AA+aEWYWNFYWOdFAF7u3j1sB/nkavjOvdJ/SdIiav9TaTtgv02sGY92n VYXSaFioAXIRd2DYiEv+YQzlcA== X-Google-Smtp-Source: AFSGD/Xve6So/1Ery1o5wmvM73iVMPQ4hP1b6ACBIixN+5CPW479nD99WkZw/3+pQqT8QAsR/mEorA== X-Received: by 2002:a1c:570d:: with SMTP id l13mr11011978wmb.139.1544446275548; Mon, 10 Dec 2018 04:51:15 -0800 (PST) Received: from andreyknvl0.muc.corp.google.com ([2a00:79e0:15:10:3180:41f8:3010:ff61]) by smtp.gmail.com with ESMTPSA id l197sm36893363wma.44.2018.12.10.04.51.14 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Mon, 10 Dec 2018 04:51:14 -0800 (PST) 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 , linux-arm-kernel@lists.infradead.org, linux-doc@vger.kernel.org, linux-mm@kvack.org, linux-arch@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 , Andrey Konovalov Subject: [PATCH v9 4/8] mm, arm64: untag user addresses in mm/gup.c Date: Mon, 10 Dec 2018 13:51:01 +0100 Message-Id: X-Mailer: git-send-email 2.20.0.rc2.403.gdbc3b29805-goog In-Reply-To: References: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org mm/gup.c provides a kernel interface that accepts user addresses and manipulates user pages directly (for example get_user_pages, that is used by the futex syscall). Since a user can provided tagged addresses, we need to handle such case. Add untagging to gup.c functions that use user addresses for vma lookup. Signed-off-by: Andrey Konovalov --- mm/gup.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/mm/gup.c b/mm/gup.c index 8cb68a50dbdf..409aedb1e2d5 100644 --- a/mm/gup.c +++ b/mm/gup.c @@ -683,6 +683,8 @@ static long __get_user_pages(struct task_struct *tsk, struct mm_struct *mm, if (!nr_pages) return 0; + start = untagged_addr(start); + VM_BUG_ON(!!pages != !!(gup_flags & FOLL_GET)); /* @@ -845,6 +847,8 @@ int fixup_user_fault(struct task_struct *tsk, struct mm_struct *mm, struct vm_area_struct *vma; vm_fault_t ret, major = 0; + address = untagged_addr(address); + if (unlocked) fault_flags |= FAULT_FLAG_ALLOW_RETRY; -- 2.20.0.rc2.403.gdbc3b29805-goog