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=-0.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_PASS 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 D7DEEC6778F for ; Fri, 27 Jul 2018 20:11:08 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 9101220857 for ; Fri, 27 Jul 2018 20:11:08 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 9101220857 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=goodmis.org 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 S2389464AbeG0Vee (ORCPT ); Fri, 27 Jul 2018 17:34:34 -0400 Received: from mail.kernel.org ([198.145.29.99]:52682 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730932AbeG0Ved (ORCPT ); Fri, 27 Jul 2018 17:34:33 -0400 Received: from gandalf.local.home (cpe-66-24-56-78.stny.res.rr.com [66.24.56.78]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id C753820842; Fri, 27 Jul 2018 20:11:04 +0000 (UTC) Date: Fri, 27 Jul 2018 16:11:03 -0400 From: Steven Rostedt To: "Theodore Y. Ts'o" Cc: Jann Horn , salyzyn@google.com, Nick Desaulniers , Golden_Miller83@protonmail.ch, Greg KH , Kees Cook , salyzyn@android.com, kernel list , Ingo Molnar , kernel-team@android.com, stable@vger.kernel.org, Kernel Hardening , Jeffrey Vander Stoep Subject: Re: [PATCH] tracing: do not leak kernel addresses Message-ID: <20180727161103.797f12b7@gandalf.local.home> In-Reply-To: <20180727195416.GF13922@thunk.org> References: <20180726181558.25a5c3b8@gandalf.local.home> <753E9YR1QhdsPhsFoYuXCwfUzfyntDrc_A93hMUkktMi7lbh3KUZMcbfqKVWUfi15zYhuiDFant-ROa4QNV5shx74ff4hGngq2BOJDv-hq4=@protonmail.ch> <20180727094730.3a448629@gandalf.local.home> <20180727143141.4b53d554@gandalf.local.home> <20180727195416.GF13922@thunk.org> X-Mailer: Claws Mail 3.16.0 (GTK+ 2.24.32; x86_64-pc-linux-gnu) MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Fri, 27 Jul 2018 15:54:16 -0400 "Theodore Y. Ts'o" wrote: > More generally, stupid question, but does Android *really* need to > have debugfs mounted? And if so, can we figure out what facilities > that are needed and can we find some other way of meeting those > requirements? I do know that they have applications that use ftrace. But then again, the ftrace files are under its own tracefs file system (that just happens to be mounted when debugfs is). That said, I would assume that other Android utilities are using other debugfs files for system status and such. -- Steve