netdev - Re: [PATCH RFC net-next] net: Allow name change of IFF

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20170810141018.GC24790@lunn.ch>
Date:   Thu, 10 Aug 2017 16:10:18 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Vitaly Kuznetsov <vkuznets@...hat.com>
Cc:     ???????????? <hideaki.yoshifuji@...aclelinux.com>,
        network dev <netdev@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Stephen Hemminger <stephen@...workplumber.org>
Subject: Re: [PATCH RFC net-next] net: Allow name change of IFF_UP interfaces

> >> Can you think of any particular real world scenarios which are broken by
> >> the change?
> >
> > How about:
> >
> > man 8 dhclient-script
> >
> > The interface name is passed in $interface to the scripts. Do we get
> > the old name or the new name? I suspect scripts are going to break if
> > they are given the old name, which no longer exists.
> 
> Yes but why would anyone change interface name while dhclient-script is
> running? Things will also go wrong if you try bringing interface down
> during the run or do some other configuration, right?

dhclient already handles the interface going down. sendto/recvfrom
fails and returns an error code. As far as i remember, dhclient then
exits.

> Running multiple configuration tools at the same moment is a bad
> idea, you never know what you're gonna end up with.

It could be argued that configuring an interface vs renaming an
interface are at different levels.

	  Andrew