Date: Tue, 5 Apr 2016 09:46:32 -0400
From: Greg KH <gregkh@linuxfoundation.org>
To: "Boyce, Kevin P (AS)" <Kevin.Boyce@ngc.com>
Cc: Wade Mealing <wmealing@redhat.com>,
        =?iso-8859-1?Q?Bj=F8rn?= Mork <bjorn@mork.no>,
        Oliver Neukum <oneukum@suse.com>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        linux-usb <linux-usb@vger.kernel.org>,
        "linux-audit@redhat.com" <linux-audit@redhat.com>
Subject: Re: EXT :Re: [RFC] Create an audit record of USB specific details
Message-ID: <20160405134632.GC31313@kroah.com>
References: <1459742562-22803-1-git-send-email-wmail@redhat.com>
 <1459752519.24025.5.camel@suse.com>
 <87bn5pzuh1.fsf@nemi.mork.no>
 <CALJHwhR5FQaa6v=ZPyLRZ8L+OrucXqEiwe6QE43HybM2keErYg@mail.gmail.com>
 <889498a2eca043d5af1fe23ffb574284@XCGVAG30.northgrum.com>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <889498a2eca043d5af1fe23ffb574284@XCGVAG30.northgrum.com>
User-Agent: Mutt/1.6.0 (2016-04-01)
Sender: linux-kernel-owner@vger.kernel.org
Content-Length: 934
Lines: 26

On Tue, Apr 05, 2016 at 11:49:14AM +0000, Boyce, Kevin P (AS) wrote:
> Wade,
> 
> Wouldn't this imply that every time the system is booted and the PCI
> bus for example is enumerated and all of the devices are created that
> all of those activities generate audit events?
> That sounds less than desiriable.  Does this imply that the audit
> subsystem should maintain a "baseline" of hardware that is always
> present on the system?  

If you do, what happens when your PCI devices renumber themselves the
next time you boot (hint, PCI numbering is not static.)

> Couldn't you audit a directory under /proc/usb?

There is no "/proc/usb/" :)

> Correct me if I am wrong, but doesn't audititing of the syscall mknod
> create an event when devices are "added" to the system?

The kernel calls mknod itself on devtmpfs, userspace doesn't do that
anymore (hasn't for a long time).  Do you get those audit events today?

thanks,

greg k-h