linux-kernel - Re: [RFC PATCH] cmdline: Hide "debug" from /proc/cmdline

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Message-ID: <20140402213827.33d73f36@gandalf.local.home>
Date:	Wed, 2 Apr 2014 21:38:27 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Jiri Kosina <jkosina@...e.cz>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Mateusz Guzik <mguzik@...hat.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>, Borislav Petkov <bp@...en8.de>,
	Ingo Molnar <mingo@...nel.org>, Mel Gorman <mgorman@...e.de>,
	Kay Sievers <kay@...y.org>
Subject: Re: [RFC PATCH] cmdline: Hide "debug" from /proc/cmdline

On Wed, 2 Apr 2014 16:52:59 -0700
Linus Torvalds <torvalds@...ux-foundation.org> wrote:

> On Wed, Apr 2, 2014 at 4:47 PM, Jiri Kosina <jkosina@...e.cz> wrote:
> >
> > Which doesn't really protect you from tasks that do open()/write()/close()
> > cycle for /dev/kmsg write every 2ms though.
> 
> I don't think we should try to protect against wilful bad behavior
> unless that is shown to be necessary. Yeah, if it turns out that
> systemd really does that just to mess with us, we'd need to extend it,
> but in the absence of proof to the contrary, maybe this simple
> attached patch works?

I wonder if we should also add a "ignore_devkmsg" that basically
turns writing into /dev/kmsg into /dev/null. That way, a simple "debug"
and "ignore_devkmsg" wont blow away the printk ring buffer from data you
want to look at on boot up.

-- Steve
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