linux-kernel - Re: [PATCH v2] printk: Add kernel parameter to disable writes to /dev/kmsg

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Date:	Mon, 25 Apr 2016 16:34:18 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Peter Zijlstra <peterz@...radead.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...nel.org>, Borislav Petkov <bp@...en8.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Uwe Kleine-König 
	<u.kleine-koenig@...gutronix.de>
Subject: Re: [PATCH v2] printk: Add kernel parameter to disable writes to
 /dev/kmsg

On Mon, 25 Apr 2016 13:23:36 -0700
Linus Torvalds <torvalds@...ux-foundation.org> wrote:

 
> But the other issue is that once you actually have logging working, I
> don't see why you don't just look at the system logs. Yeah, it's not
> /var/log/messages any more, but it's not *that* hard to do. Just use
> "journalctl -k" instead of dmesg, and you won't be missing data.

There's a bug somewhere with mine:

# journalctl -k
No journal files were found.
-- No entries --

And dmesg is filled with that session crap.

> 
> This is why I harp on rate limiting, and I think your patch is silly:
> it solves the wrong problem (the one that isn't a real problem), and
> it does it with a sledgehammer when a flyswatter would be more
> appropriate.
> 

Unfortunately, it appears that my logging is broken. I don't have
anything useful in /var/log/ with respect to kernel messages.

Thus when userspace is broken, you are basically shit-out-of-luck.

-- Steve