linux-kernel - Re: [PATCH 24/24] debugfs: Restrict debugfs when the kernel is locked down

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Date:   Wed, 11 Apr 2018 21:08:21 +0100
From:   David Howells <dhowells@...hat.com>
To:     ebiederm@...ssion.com (Eric W. Biederman)
Cc:     dhowells@...hat.com, torvalds@...ux-foundation.org,
        linux-man@...r.kernel.org, linux-api@...r.kernel.org,
        jmorris@...ei.org, linux-kernel@...r.kernel.org,
        linux-security-module@...r.kernel.org
Subject: Re: [PATCH 24/24] debugfs: Restrict debugfs when the kernel is locked down

Eric W. Biederman <ebiederm@...ssion.com> wrote:

> Why is mounting debugfs allowed at all?  Last I checked (it has been a while)
> the code quality of debugfs was fine for debugging but debugfs was not
> safe to mount on a production system.
> 
> Maybe the code quality is better now but for a filesystem that is
> not supposed to be needed for developers letting us mount debugfs
> seems odd.

I agree.  But debugfs has been abused and it seems that there are some things
that use it as an interface between a kernel driver and the userspace side.

David