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Date: Mon, 25 Apr 2016 12:54:37 -0700 From: Greg Kroah-Hartman <gregkh@...uxfoundation.org> To: Peter Zijlstra <peterz@...radead.org> Cc: Steven Rostedt <rostedt@...dmis.org>, Linus Torvalds <torvalds@...ux-foundation.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, Apr 25, 2016 at 09:24:35PM +0200, Peter Zijlstra wrote: > On Mon, Apr 25, 2016 at 12:18:15PM -0700, Greg Kroah-Hartman wrote: > > On Mon, Apr 25, 2016 at 09:06:51PM +0200, Peter Zijlstra wrote: > > > On Mon, Apr 25, 2016 at 02:56:06PM -0400, Steven Rostedt wrote: > > > > +static bool __read_mostly devkmsg_disabled; > > > > +static int __init disable_devkmsg(char *str) > > > > +{ > > > > + devkmsg_disabled = true; > > > > + return 0; > > > > +} > > > > +__setup("printk.disable_kmsg_write", disable_devkmsg); > > > > > > Again, please default enable and use an easier name to toggle this. > > > Userspace flooding this with junk is really insane. > > > > If you default enable, you break working systems today that want to log > > stuff through this interface, sorry. > > Oh, you mean those 'working' systems that livelocked my box because I > had console to serial enabled which could not keep up with the endless > flood of shite? > > This systemd exposure has seriously eroded your sanity. See Andrew's message, this was added because of klibc :)
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