From: "Austin S. Hemmelgarn" <ahferroin7@gmail.com>
To: Steven Rostedt <rostedt@goodmis.org>, Pavel Machek <pavel@ucw.cz>
Cc: Linus Torvalds <torvalds@linux-foundation.org>,
LKML <linux-kernel@vger.kernel.org>,
Andrew Morton <akpm@linux-foundation.org>,
Ingo Molnar <mingo@kernel.org>,
Peter Zijlstra <peterz@infradead.org>,
Borislav Petkov <bp@alien8.de>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Subject: Re: printk: Add kernel parameter to disable writes to /dev/kmsg
Date: Wed, 27 Apr 2016 07:25:39 -0400 [thread overview]
Message-ID: <5720A1B3.9020604@gmail.com> (raw)
In-Reply-To: <20160426154742.0da764a9@gandalf.local.home>
On 2016-04-26 15:47, Steven Rostedt wrote:
> On Tue, 26 Apr 2016 20:44:58 +0200
> Pavel Machek <pavel@ucw.cz> 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.
prev parent reply other threads:[~2016-04-27 11:26 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-04-25 17:06 printk: Add kernel parameter to disable writes to /dev/kmsg Steven Rostedt
2016-04-25 17:08 ` [PATCH] " Steven Rostedt
2016-04-25 18:32 ` Borislav Petkov
2016-04-25 18:40 ` Steven Rostedt
2016-04-25 18:50 ` Peter Zijlstra
2016-04-26 18:44 ` Pavel Machek
2016-04-26 19:47 ` Steven Rostedt
2016-04-27 11:25 ` Austin S. Hemmelgarn [this message]
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