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

From: Steven Rostedt
Date: Wed Apr 02 2014 - 21:38:43 EST

On Wed, 2 Apr 2014 16:52:59 -0700
Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx> wrote:

> On Wed, Apr 2, 2014 at 4:47 PM, Jiri Kosina <jkosina@xxxxxxx> 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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