Re: [PATCH] printk: Add kernel parameter to disable writes to /dev/kmsg
From: Borislav Petkov
Date: Mon Apr 25 2016 - 14:32:58 EST
On Mon, Apr 25, 2016 at 01:08:53PM -0400, Steven Rostedt wrote:
> [ Sorry for the resend, I forgot to add "[PATCH]" to the subject, which
> may make this fail filters. ]
>
> 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:
...
> + disable_devkmsg_write
> + Disable writing to /dev/kmsg. This prevents user space
> + tools from writing into the kernel printk buffers.
> + When set, opening /dev/kmsg for write mode will return
> + -EPERM.
I like the general idea.
Perhaps can call that param "printk.disable_devkmsg" or so with the
proper namespace and in light of printk.always_kmsg_dump=...
Anyway, just my 2Â.
Thanks.
--
Regards/Gruss,
Boris.
ECO tip #101: Trim your mails when you reply.