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

From	Borislav Petkov <bp@alien8.de>
Newsgroups	linux.kernel
Subject	Re: [PATCH] printk: Add kernel parameter to disable writes to /dev/kmsg
Date	2016-04-25 20:40 +0200
Message-ID	<rrTAl-22j-1@gated-at.bofh.it> (permalink)
References	<rrSbg-172-3@gated-at.bofh.it> <rrSbh-172-21@gated-at.bofh.it>
Organization	linux.* mail to news gateway

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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 2¢.

Thanks.

-- 
Regards/Gruss,
    Boris.

ECO tip #101: Trim your mails when you reply.

Thread

printk: Add kernel parameter to disable writes to /dev/kmsg Steven Rostedt <rostedt@goodmis.org> - 2016-04-25 19:10 +0200
  [PATCH] printk: Add kernel parameter to disable writes to /dev/kmsg Steven Rostedt <rostedt@goodmis.org> - 2016-04-25 19:10 +0200
    Re: [PATCH] printk: Add kernel parameter to disable writes to  /dev/kmsg Borislav Petkov <bp@alien8.de> - 2016-04-25 20:40 +0200
      Re: [PATCH] printk: Add kernel parameter to disable writes to  /dev/kmsg Steven Rostedt <rostedt@goodmis.org> - 2016-04-25 20:50 +0200
  Re: printk: Add kernel parameter to disable writes to /dev/kmsg Peter Zijlstra <peterz@infradead.org> - 2016-04-25 21:00 +0200
  Re: printk: Add kernel parameter to disable writes to /dev/kmsg Pavel Machek <pavel@ucw.cz> - 2016-04-26 20:50 +0200
    Re: printk: Add kernel parameter to disable writes to /dev/kmsg Steven Rostedt <rostedt@goodmis.org> - 2016-04-26 21:50 +0200
      Re: printk: Add kernel parameter to disable writes to /dev/kmsg "Austin S. Hemmelgarn" <ahferroin7@gmail.com> - 2016-04-27 13:30 +0200

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