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

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Date:	Wed, 15 Jun 2016 15:40:04 -1000
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	Ingo Molnar <mingo@...nel.org>, Borislav Petkov <bp@...en8.de>,
	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, Jun 14, 2016 at 8:14 AM, Steven Rostedt <rostedt@...dmis.org> wrote:
>>
>> 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.

Possibly we could just say that if a kernel command line option has
been given, that is absolute.

And then a sysctl for when you do *not* explicitly set if on the
kernel command line?

             Linus