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Re: [PATCH 2/2] printk: Add kernel parameter to control writes to /dev/kmsg

From Steven Rostedt <rostedt@goodmis.org>
Newsgroups linux.kernel
Subject Re: [PATCH 2/2] printk: Add kernel parameter to control writes to /dev/kmsg
Date 2016-06-14 20:20 +0200
Message-ID <rK16q-8sH-9@gated-at.bofh.it> (permalink)
References <rJTBT-3uB-7@gated-at.bofh.it> <rJTBT-3uB-17@gated-at.bofh.it> <rJTLz-3z3-7@gated-at.bofh.it>
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On Tue, 14 Jun 2016 12:21:35 +0200
Ingo Molnar <mingo@kernel.org> wrote:

> * Borislav Petkov <bp@alien8.de> wrote:
> 
> > From: Borislav Petkov <bp@suse.de>
> > 
> > Add a "printk.kmsg" kernel command line parameter which controls how
> > userspace writes into /dev/kmsg. It has two options:
> > 
> > * on  - unlimited logging from userspace
> > * off - logging from userspace gets ignored  
> 
> Please also add a sysctl!
> 
> I *so* want to enable this on distro kernels without having to reboot the 
> kernel...
> 

But can we make it a one way feature (or a kernel parameter to do so?)
that will prevent userspace from enabling it after it's been disabled.

-- Steve

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Thread

[PATCH 0/2] printk.kmsg: Ratelimit it by default Borislav Petkov <bp@alien8.de> - 2016-06-14 12:20 +0200
  [PATCH 2/2] printk: Add kernel parameter to control writes to /dev/kmsg Borislav Petkov <bp@alien8.de> - 2016-06-14 12:20 +0200
    Re: [PATCH 2/2] printk: Add kernel parameter to control writes to  /dev/kmsg Ingo Molnar <mingo@kernel.org> - 2016-06-14 12:30 +0200
      Re: [PATCH 2/2] printk: Add kernel parameter to control writes to  /dev/kmsg Steven Rostedt <rostedt@goodmis.org> - 2016-06-14 20:20 +0200
        Re: [PATCH 2/2] printk: Add kernel parameter to control writes to  /dev/kmsg Borislav Petkov <bp@alien8.de> - 2016-06-14 20:40 +0200
        Re: [PATCH 2/2] printk: Add kernel parameter to control writes to /dev/kmsg Linus Torvalds <torvalds@linux-foundation.org> - 2016-06-16 03:50 +0200
          Re: [PATCH 2/2] printk: Add kernel parameter to control writes to  /dev/kmsg Borislav Petkov <bp@alien8.de> - 2016-06-16 12:00 +0200
  Re: [PATCH 0/2] printk.kmsg: Ratelimit it by default Linus Torvalds <torvalds@linux-foundation.org> - 2016-06-16 03:50 +0200

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