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

[Steven Rostedt]

On Tue, 14 Jun 2016 12:21:35 +0200
Ingo Molnar <mingo@xxxxxxxxxx> wrote:

> * Borislav Petkov <bp@xxxxxxxxx> wrote:
> 
> > From: Borislav Petkov <bp@xxxxxxx>
> > 
> > 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