linux-kernel - Re: [PATCH net-next v5 19/22] ethtool: provide WoL information in GET

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Date:   Thu, 28 Mar 2019 11:10:54 +0100
From:   Michal Kubecek <mkubecek@...e.cz>
To:     Florian Fainelli <f.fainelli@...il.com>
Cc:     David Miller <davem@...emloft.net>, netdev@...r.kernel.org,
        Jakub Kicinski <jakub.kicinski@...ronome.com>,
        Jiri Pirko <jiri@...nulli.us>, Andrew Lunn <andrew@...n.ch>,
        John Linville <linville@...driver.com>,
        Stephen Hemminger <stephen@...workplumber.org>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next v5 19/22] ethtool: provide WoL information in
 GET_SETTINGS request

On Wed, Mar 27, 2019 at 08:42:26PM -0700, Florian Fainelli wrote:
> On 3/25/2019 10:08 AM, Michal Kubecek wrote:
> >  
> > +	data->privileged = ethnl_is_privileged(skb);
> 
> Is not this potentially creating a time of check/time of use issue? Can
> you check for ethnl_is_privileged() at the time where you fill in the
> reply skb?

I'm not sure what kind of race you have in mind but if this is a
problem, we might have even bigger one for any "SET" request where the
privilege check is performed even earlier by the genetlink dispatcher
(by setting GENL_UNS_ADMIN_PERM or GENL_ADMIN_PERM flag in genl_ops).

Michal