2019-05-13, 15:17:33 +0200, Nicolas Dichtel wrote:
> Le 13/05/2019 à 15:01, Sabrina Dubroca a écrit :
> > Currently, nla_put_iflink() doesn't put the IFLA_LINK attribute when
> > iflink == ifindex.
> >
> > In some cases, a device can be created in a different netns with the
> > same ifindex as its parent. That device will not dump its IFLA_LINK
> > attribute, which can confuse some userspace software that expects it.
> > For example, if the last ifindex created in init_net and foo are both
> > 8, these commands will trigger the issue:
> >
> > ip link add parent type dummy # ifindex 9
> > ip link add link parent netns foo type macvlan # ifindex 9 in ns foo
> >
> > So, in case a device puts the IFLA_LINK_NETNSID attribute in a dump,
> > always put the IFLA_LINK attribute as well.
> >
> > Thanks to Dan Winship for analyzing the original OpenShift bug down to
> > the missing netlink attribute.
> Good catch.
>
> >
> > Analyzed-by: Dan Winship <d...@redhat.com>
> > Fixes: a54acb3a6f85 ("dev: introduce dev_get_iflink()")
> I don't agree with the Fixes tag. The test 'iflink != ifindex' is here at
> least
> since the beginning of the git history.
Hmpf, right, now that I re-blamed, I see. I don't know why I stopped
on your patch, sorry.
> > Signed-off-by: Sabrina Dubroca <s...@queasysnail.net>
> Acked-by: Nicolas Dichtel <nicolas.dich...@6wind.com>
Thanks!
I'll repost with a correct Fixes tag and your Ack.
--
Sabrina
