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

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  [PATCH v2] printk: Add kernel parameter to disable writes to  /dev/kmsg Steven Rostedt <rostedt@goodmis.org> - 2016-04-25 21:00 +0200
    Re: [PATCH v2] printk: Add kernel parameter to disable writes to  /dev/kmsg Peter Zijlstra <peterz@infradead.org> - 2016-04-25 21:10 +0200
      Re: [PATCH v2] printk: Add kernel parameter to disable writes to  /dev/kmsg Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2016-04-25 21:20 +0200
        Re: [PATCH v2] printk: Add kernel parameter to disable writes to  /dev/kmsg Peter Zijlstra <peterz@infradead.org> - 2016-04-25 21:30 +0200
          Re: [PATCH v2] printk: Add kernel parameter to disable writes to  /dev/kmsg Andrew Morton <akpm@linux-foundation.org> - 2016-04-25 21:50 +0200
          Re: [PATCH v2] printk: Add kernel parameter to disable writes to  /dev/kmsg Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2016-04-25 22:00 +0200
            Re: [PATCH v2] printk: Add kernel parameter to disable writes to  /dev/kmsg Steven Rostedt <rostedt@goodmis.org> - 2016-04-25 22:10 +0200
              Re: [PATCH v2] printk: Add kernel parameter to disable writes to /dev/kmsg Linus Torvalds <torvalds@linux-foundation.org> - 2016-04-25 22:30 +0200
                Re: [PATCH v2] printk: Add kernel parameter to disable writes to  /dev/kmsg Steven Rostedt <rostedt@goodmis.org> - 2016-04-25 22:40 +0200
                  Re: [PATCH v2] printk: Add kernel parameter to disable writes to /dev/kmsg Linus Torvalds <torvalds@linux-foundation.org> - 2016-04-25 22:50 +0200
                    Re: [PATCH v2] printk: Add kernel parameter to disable writes to  /dev/kmsg Steven Rostedt <rostedt@goodmis.org> - 2016-04-25 23:30 +0200
                Re: [PATCH v2] printk: Add kernel parameter to disable writes to  /dev/kmsg Borislav Petkov <bp@alien8.de> - 2016-04-26 13:10 +0200
            Re: [PATCH v2] printk: Add kernel parameter to disable writes to  /dev/kmsg Peter Zijlstra <peterz@infradead.org> - 2016-04-26 13:20 +0200
        Re: [PATCH v2] printk: Add kernel parameter to disable writes to  /dev/kmsg Steven Rostedt <rostedt@goodmis.org> - 2016-04-25 21:40 +0200
      Re: [PATCH v2] printk: Add kernel parameter to disable writes to /dev/kmsg Linus Torvalds <torvalds@linux-foundation.org> - 2016-04-25 21:30 +0200
        Re: [PATCH v2] printk: Add kernel parameter to disable writes to  /dev/kmsg Steven Rostedt <rostedt@goodmis.org> - 2016-04-25 21:40 +0200
        Re: [PATCH v2] printk: Add kernel parameter to disable writes to /dev/kmsg Linus Torvalds <torvalds@linux-foundation.org> - 2016-04-25 21:40 +0200
        Re: [PATCH v2] printk: Add kernel parameter to disable writes to  /dev/kmsg Steven Rostedt <rostedt@goodmis.org> - 2016-04-25 21:50 +0200
          Re: [PATCH v2] printk: Add kernel parameter to disable writes to  /dev/kmsg Ingo Molnar <mingo@kernel.org> - 2016-04-26 07:40 +0200
            Re: [PATCH v2] printk: Add kernel parameter to disable writes to /dev/kmsg Bjørn Mork <bjorn@mork.no> - 2016-04-26 12:50 +0200
              Re: [PATCH v2] printk: Add kernel parameter to disable writes to  /dev/kmsg Peter Zijlstra <peterz@infradead.org> - 2016-04-26 13:10 +0200
    Re: [PATCH v2] printk: Add kernel parameter to disable writes to /dev/kmsg Andi Kleen <andi@firstfloor.org> - 2016-04-25 21:50 +0200

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#1387375

On Tue, Apr 26, 2016 at 12:43:49PM +0200, Bjørn Mork wrote:
> Ingo Molnar <mingo@kernel.org> writes:
> 
> >  static int parse_proc_cmdline_item(const char *key, const char *value) {
> >
> >         /*
> >          * The systemd.log_xyz= settings are parsed by all tools, and
> >          * so is "debug".
> >          *
> >          * However, "quiet" is only parsed by PID 1, and only turns of
> >          * status output to /dev/console, but does not alter the log
> >          * level.
> >          */
> >
> >         if (streq(key, "debug") && !value)
> >                 log_set_max_level(LOG_DEBUG);
> >
> >         else if (streq(key, "systemd.log_target") && value) {
> >
> > Why systemd does this fully knowing that other software (such as the kernel) 
> > already uses 'debug', while systemd already has the 'system.*' parameter namespace 
> > is left up to the reader...
> 
> A couple of links to save that reader from making futile comments:
> https://lkml.org/lkml/2014/4/2/415
> https://bugs.freedesktop.org/show_bug.cgi?id=76935

Thanks for providing the links, I did remember all that.

Its one of the many reasons why I recommend against running
systemd(isease).

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#1386803 — Re: [PATCH v2] printk: Add kernel parameter to disable writes to /dev/kmsg

Steven Rostedt <rostedt@goodmis.org> writes:

> Over the weekend my server was acting funny. The display wasn't working
> well, and I assumed that a driver was going bad. I went to look at the
> kernel dmesg, but the buffer only had the following over and over:

You may also like

https://lkml.org/lkml/2016/4/9/70

Otherwise if you use Chrome the logs totally get spammed every time
you open a new tab. This was the number one log spam cause on my
system.

Unfortunately the audit maintainers totally fail to recognize this
as a fatal flaw :-(

-Andi

-- 
ak@linux.intel.com -- Speaking for myself only

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