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=-1.0 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_PASS,URIBL_BLOCKED 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 5748FC43441 for ; Mon, 19 Nov 2018 15:19:11 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 22BCC20831 for ; Mon, 19 Nov 2018 15:19:11 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 22BCC20831 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=linux.intel.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 S1729741AbeKTBnD (ORCPT ); Mon, 19 Nov 2018 20:43:03 -0500 Received: from mga14.intel.com ([192.55.52.115]:62708 "EHLO mga14.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729589AbeKTBnD (ORCPT ); Mon, 19 Nov 2018 20:43:03 -0500 X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from fmsmga001.fm.intel.com ([10.253.24.23]) by fmsmga103.fm.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 19 Nov 2018 07:19:09 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.56,252,1539673200"; d="scan'208";a="109370299" Received: from linux.intel.com ([10.54.29.200]) by fmsmga001.fm.intel.com with ESMTP; 19 Nov 2018 07:19:08 -0800 Received: from [10.252.27.191] (abudanko-mobl.ccr.corp.intel.com [10.252.27.191]) by linux.intel.com (Postfix) with ESMTP id 5740D580032; Mon, 19 Nov 2018 07:19:04 -0800 (PST) Subject: Re: [PATCH v1 2/2]: Documentation/admin-guide: introduce perf-security.rst file To: Jordan Glover , Peter Zijlstra Cc: Thomas Gleixner , Kees Cook , Jann Horn , Ingo Molnar , Arnaldo Carvalho de Melo , Andi Kleen , Jonatan Corbet , Alexander Shishkin , Jiri Olsa , Namhyung Kim , Mark Rutland , Tvrtko Ursulin , linux-kernel , "kernel-hardening@lists.openwall.com" , "linux-doc@vger.kernel.org" References: <0ac97cd0-4773-fff6-7d4e-74c4a1f076c4@linux.intel.com> <20181119104646.GB9761@hirez.programming.kicks-ass.net> From: Alexey Budankov Organization: Intel Corp. Message-ID: Date: Mon, 19 Nov 2018 18:19:03 +0300 User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:52.0) Gecko/20100101 Thunderbird/52.9.1 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi, On 19.11.2018 13:49, Jordan Glover wrote: > On Monday, November 19, 2018 11:46 AM, Peter Zijlstra wrote: > >> On Mon, Nov 19, 2018 at 10:35:59AM +0000, Jordan Glover wrote: >> >>> On Monday, November 19, 2018 6:42 AM, Alexey Budankov alexey.budankov@linux.intel.com wrote: >>> >>>> +>=3: >>>> >>>> - Restrict *access* to PCL performance monitoring for unprivileged processes. >>>> >>>> >>>> - This is the default on Debian and Android [7]_ , [8]_ . >>>> >>>> >>> >>> AFAIK there is no support for '+>=3' in mainline kernel[1]. >>> Debian and Android use out-of-tree patch for that[2]. >>> Maybe someone should upstream it? >> >> NAK still stands on that. Alternative's have been proposed but so far >> nobody that cared seems to care enough to implement those. > > So, I guess we can't document NAKed patches :) Please stay tuned for v2. Thanks, Alexey > > Jordan > >