linux-kernel - Re: [PATCH 15/24] asus-wmi: Restrict debugfs interface when the kernel is locked down

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Message-ID: <16503.1492529434@warthog.procyon.org.uk>
Date:   Tue, 18 Apr 2017 16:30:34 +0100
From:   David Howells <dhowells@...hat.com>
To:     Ben Hutchings <ben@...adent.org.uk>
Cc:     dhowells@...hat.com, Andy Shevchenko <andy.shevchenko@...il.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        matthew.garrett@...ula.com, linux-efi@...r.kernel.org,
        One Thousand Gnomes <gnomes@...rguk.ukuu.org.uk>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        acpi4asus-user <acpi4asus-user@...ts.sourceforge.net>,
        Platform Driver <platform-driver-x86@...r.kernel.org>,
        linux-security-module <linux-security-module@...r.kernel.org>,
        keyrings@...r.kernel.org
Subject: Re: [PATCH 15/24] asus-wmi: Restrict debugfs interface when the kernel is locked down

Ben Hutchings <ben@...adent.org.uk> wrote:

> So it's generally not going to be OK to turn off debugfs.  There will
> probably need to be a distinction between believed-safe and unsafe
> directories/files.

Any suggestion on how to mark this distinction?  I'd prefer not to modify
every read/write op associated with a debugfs file.  Modify
DEFINE_DEBUGFS_ATTRIBUTE() maybe?  And provide lockable variants of
debugfs_create_u8() and co.?

David