Re: printk: Add kernel parameter to disable writes to /dev/kmsg

[Austin S. Hemmelgarn]

On 2016-04-26 15:47, Steven Rostedt wrote:
> On Tue, 26 Apr 2016 20:44:58 +0200
> Pavel Machek <pavel@xxxxxx> wrote:
>
> > > I simply propose a way to let us kernel developers keep user space from
> > > interfering, by adding a new kernel command line parameter that will
> > > disable writing to /dev/kmsg. Any attempt to open the file in write
> > > mode will return a -EPERM error.
> >
> > chmod 400 /dev/kmsg? With udev, it should be possible to make it persistent...
>
> But this opened while initramdisk is used. I'm thinking this wont work,
> or does udev run before main root is mounted?
It does, but I don't think it runs before journald on systemd systems...

So it probably still wouldn't work.