From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <linux-kernel-owner@vger.kernel.org>
Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand
	id S933271AbcDYTHF (ORCPT <rfc822;w@1wt.eu>);
	Mon, 25 Apr 2016 15:07:05 -0400
Received: from bombadil.infradead.org ([198.137.202.9]:48464 "EHLO
	bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org
	with ESMTP id S933121AbcDYTHD (ORCPT
	<rfc822;linux-kernel@vger.kernel.org>);
	Mon, 25 Apr 2016 15:07:03 -0400
Date: Mon, 25 Apr 2016 21:06:51 +0200
From: Peter Zijlstra <peterz@infradead.org>
To: Steven Rostedt <rostedt@goodmis.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>,
        LKML <linux-kernel@vger.kernel.org>, Ingo Molnar <mingo@kernel.org>,
        Borislav Petkov <bp@alien8.de>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Andrew Morton <akpm@linux-foundation.org>,
        Uwe =?iso-8859-1?Q?Kleine-K=F6nig?= 
	<u.kleine-koenig@pengutronix.de>
Subject: Re: [PATCH v2] printk: Add kernel parameter to disable writes to
 /dev/kmsg
Message-ID: <20160425190651.GL3448@twins.programming.kicks-ass.net>
References: <20160425145606.598329f2@gandalf.local.home>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <20160425145606.598329f2@gandalf.local.home>
User-Agent: Mutt/1.5.21 (2012-12-30)
Sender: linux-kernel-owner@vger.kernel.org
List-ID: <linux-kernel.vger.kernel.org>
X-Mailing-List: linux-kernel@vger.kernel.org

On Mon, Apr 25, 2016 at 02:56:06PM -0400, Steven Rostedt wrote:
> +static bool __read_mostly devkmsg_disabled;
> +static int __init disable_devkmsg(char *str)
> +{
> +	devkmsg_disabled = true;
> +	return 0;
> +}
> +__setup("printk.disable_kmsg_write", disable_devkmsg);

Again, please default enable and use an easier name to toggle this.
Userspace flooding this with junk is really insane.