linux-kernel - Re: [PATCH 2/2] printk: Add kernel parameter to control writes to /dev/kmsg

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Date:	Tue, 14 Jun 2016 14:14:56 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Ingo Molnar <mingo@...nel.org>
Cc:	Borislav Petkov <bp@...en8.de>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Uwe Kleine-König 
	<u.kleine-koenig@...gutronix.de>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/2] printk: Add kernel parameter to control writes to
 /dev/kmsg

On Tue, 14 Jun 2016 12:21:35 +0200
Ingo Molnar <mingo@...nel.org> wrote:

> * Borislav Petkov <bp@...en8.de> wrote:
> 
> > From: Borislav Petkov <bp@...e.de>
> > 
> > Add a "printk.kmsg" kernel command line parameter which controls how
> > userspace writes into /dev/kmsg. It has two options:
> > 
> > * on  - unlimited logging from userspace
> > * off - logging from userspace gets ignored  
> 
> Please also add a sysctl!
> 
> I *so* want to enable this on distro kernels without having to reboot the 
> kernel...
> 

But can we make it a one way feature (or a kernel parameter to do so?)
that will prevent userspace from enabling it after it's been disabled.

-- Steve