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=-0.9 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_PASS autolearn=no 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 84D7CC54EEB for ; Tue, 24 Mar 2020 18:24:23 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 5F7532076E for ; Tue, 24 Mar 2020 18:24:23 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=chromium.org header.i=@chromium.org header.b="Te+uoNkO" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727657AbgCXSYW (ORCPT ); Tue, 24 Mar 2020 14:24:22 -0400 Received: from mail-pl1-f193.google.com ([209.85.214.193]:40419 "EHLO mail-pl1-f193.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727333AbgCXSYW (ORCPT ); Tue, 24 Mar 2020 14:24:22 -0400 Received: by mail-pl1-f193.google.com with SMTP id h11so7741799plk.7 for ; Tue, 24 Mar 2020 11:24:20 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=chromium.org; s=google; h=date:from:to:cc:subject:message-id:references:mime-version :content-disposition:in-reply-to; bh=hdZ4pb4Hr5HLh2IG65w9wREWo960MwcI9Mci2dzvou4=; b=Te+uoNkO5YxQ0PKXCfa8hPTzOvAaDtBv/xpbdWENa6MfwcHMxtYXq/55et3D+JiKkY k4+jNo46o/8o71/LmFLB2IexDKnRrsjXYhSoJhHfbl+OStyILKMIElZXSlBG+hMqIiiP THT3fW3und8bgqoYTJX0uiGfiDFFaBZPa7of0= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:from:to:cc:subject:message-id:references :mime-version:content-disposition:in-reply-to; bh=hdZ4pb4Hr5HLh2IG65w9wREWo960MwcI9Mci2dzvou4=; b=DpJ6S6i0n/e6GP6bRIdWnqWtVggeXmrnSJ29DgeJfuTC/1jpffjoyXXUGihOKrYB2c 5W9DXT3MR9xP8Gh0uCeGPPL8dxFCSxBbw1CFG7MjN1Bsk+alTG9bkr/YjTjZDMQNIklC 377JdyhaHloC/fIEtsy6YUfEWqLSH9drv5VN9vEWTXL/ytYYsL8LkIQgOq7rczfO/Snx NMbRDcLCn3TNyIG3iRqMlPLwFbIqFAWendRSfMByH7pZWBtyY18Eva3hYSDsivhkrR7o FixGJDFyV9duYpZhy7m88IXhgC7WUNSqNI3QjGRUE67vCjrGbCB2vti4v2nOQvtjHx26 lFNw== X-Gm-Message-State: ANhLgQ2CO/AYurJMgaUyAy86epqUL9dv8LEcf0Br/7yRxfKD7Tpgx5QG IjcPUylvjn32/om9j+zE2puvzw== X-Google-Smtp-Source: ADFU+vsOsKtovHRYR1HCH2j5HOW+TQwDponkESPPOmpa5eJqfEtjFxsV1s5h4YhSH6jF3y7mNBC1FA== X-Received: by 2002:a17:902:b096:: with SMTP id p22mr22516835plr.262.1585074259621; Tue, 24 Mar 2020 11:24:19 -0700 (PDT) Received: from www.outflux.net (smtp.outflux.net. [198.145.64.163]) by smtp.gmail.com with ESMTPSA id t1sm15518010pgh.88.2020.03.24.11.24.18 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 24 Mar 2020 11:24:18 -0700 (PDT) Date: Tue, 24 Mar 2020 11:24:17 -0700 From: Kees Cook To: Vlastimil Babka Cc: Luis Chamberlain , Iurii Zaikin , linux-kernel@vger.kernel.org, linux-api@vger.kernel.org, linux-mm@kvack.org, Ivan Teterevkov , Michal Hocko , David Rientjes , Matthew Wilcox , "Eric W . Biederman" Subject: Re: [RFC] kernel/sysctl: support setting sysctl parameters from kernel command line Message-ID: <202003241121.44E725B@keescook> References: <20200317132105.24555-1-vbabka@suse.cz> <202003171421.5DCADF51@keescook> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: Sender: linux-api-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-api@vger.kernel.org On Tue, Mar 24, 2020 at 05:50:49PM +0100, Vlastimil Babka wrote: > On 3/17/20 10:29 PM, Kees Cook wrote: > > mm.transparent_hugepage.enabled > > Hm, transparent_hugepage is in sysfs (/sys/kernel/mm), but not sysctl, at least > in my case the sysctl tool doesn't list it. Yours does? Yay for consistency. Oh, whoops! That was my mistake; my eyes skipped out of /proc/sys ;) > > I like the idea if just for having to build less boiler plate for > > supporting things that I've had to plumb to both boot_params and sysctl. > > :) > > Thanks, I will pursue the idea further then :) Awesome! I've wanted this for a long time but never had the time to give it a try. :) -- Kees Cook