linux-kernel - Re: [PATCH 6/9] Add a general, global device notification watch list [ver #5]

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Date:   Fri, 5 Jul 2019 10:40:36 -0400 (EDT)
From:   Alan Stern <stern@...land.harvard.edu>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
cc:     David Howells <dhowells@...hat.com>, <viro@...iv.linux.org.uk>,
        Casey Schaufler <casey@...aufler-ca.com>,
        Stephen Smalley <sds@...ho.nsa.gov>,
        <nicolas.dichtel@...nd.com>, <raven@...maw.net>,
        Christian Brauner <christian@...uner.io>,
        <keyrings@...r.kernel.org>, <linux-usb@...r.kernel.org>,
        <linux-security-module@...r.kernel.org>,
        <linux-fsdevel@...r.kernel.org>, <linux-api@...r.kernel.org>,
        <linux-block@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 6/9] Add a general, global device notification watch list
 [ver #5]

On Fri, 5 Jul 2019, Greg Kroah-Hartman wrote:

> On Fri, Jul 05, 2019 at 09:04:17AM +0100, David Howells wrote:
> > Greg Kroah-Hartman <gregkh@...uxfoundation.org> wrote:
> > 
> > > Hm, good point, but there should be some way to test this to verify it
> > > works.  Maybe for the other types of events?
> > 
> > Keyrings is the simplest.  keyutils's testsuite will handle that.  I'm trying
> > to work out if I can simply make every macro in there that does a modification
> > perform a watch automatically to make sure the appropriate events happen.
> 
> That should be good enough to test the basic functionality.  After this
> gets merged I'll see if I can come up with a way to test the USB
> stuff...

You can create USB connect and disconnect events programmatically by
using dummy-hcd with gadget-zero.  Turning off the port's POWER feature
will cause a disconnect, and turning it back on will cause a connect.

Alan Stern