linux-kernel - RE: [PATCH] mei: remove dev_err message on an unsupported ioctl

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Date:   Wed, 28 Feb 2018 09:52:42 +0000
From:   "Winkler, Tomas" <tomas.winkler@...el.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
CC:     Colin King <colin.king@...onical.com>,
        Arnd Bergmann <arnd@...db.de>,
        "kernel-janitors@...r.kernel.org" <kernel-janitors@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH] mei: remove dev_err message on an unsupported ioctl

> 
> On Tue, Feb 27, 2018 at 09:44:41PM +0000, Winkler, Tomas wrote:
> > >
> > > On Tue, Feb 27, 2018 at 05:26:22PM +0000, Winkler, Tomas wrote:
> > > > >
> > > > > From: Colin Ian King <colin.king@...onical.com>
> > > > >
> > > > > Currently the driver spams the kernel log on unsupported ioctls
> > > > > which is unnecessary as the ioctl returns -ENOIOCTLCMD to
> > > > > indicate this
> > > anyway.
> > > > > I suspect this was originally for debugging purposes but it
> > > > > really is not required so remove it.
> > > > >
> > > >
> > > > This is rather strange as most of the legimit applications are
> > > > using one IOCTL from kernel 3.0 Do you have any reference where
> > > > this call is
> > > originated from, frankly this is the first time I got such complain.
> > > >
> > > > In any case it would be maybe better to change it a warn once call.
> > >
> > > Just drop the message, it should not be this easy for userspace to
> > > spam the kernel log.  The patch looks fine to me.
> > >
> > Fair enough, add my ack too.
> >
> > Still I'm curious if this comes from the field.
> 
> fuzzers are "in the field" :)

It's definitely fuzzers season.

Tomas