linux-kernel - Re: [PATCH net-next 0/2 v5] netns: uevent filtering

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Message-ID: <87fu3cbsdw.fsf@xmission.com>
Date:   Mon, 30 Apr 2018 10:55:55 -0500
From:   ebiederm@...ssion.com (Eric W. Biederman)
To:     Christian Brauner <christian.brauner@...ntu.com>
Cc:     davem@...emloft.net, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, avagin@...tuozzo.com,
        ktkhai@...tuozzo.com, serge@...lyn.com, gregkh@...uxfoundation.org
Subject: Re: [PATCH net-next 0/2 v5] netns: uevent filtering

Christian Brauner <christian.brauner@...ntu.com> writes:

> Hey everyone,
>
> This is the new approach to uevent filtering as discussed (see the
> threads in [1], [2], and [3]). It only contains *non-functional
> changes*.
>
> This series deals with with fixing up uevent filtering logic:
> - uevent filtering logic is simplified
> - locking time on uevent_sock_list is minimized
> - tagged and untagged kobjects are handled in separate codepaths
> - permissions for userspace are fixed for network device uevents in
>   network namespaces owned by non-initial user namespaces
>   Udev is now able to see those events correctly which it wasn't before.
>   For example, moving a physical device into a network namespace not
>   owned by the initial user namespaces before gave:
>
>   root@...1:~# udevadm --debug monitor -k
>   calling: monitor
>   monitor will print the received events for:
>   KERNEL - the kernel uevent
>
>   sender uid=65534, message ignored
>   sender uid=65534, message ignored
>   sender uid=65534, message ignored
>   sender uid=65534, message ignored
>   sender uid=65534, message ignored
>
>   and now after the discussion and solution in [3] correctly gives:
>
>   root@...1:~# udevadm --debug monitor -k
>   calling: monitor
>   monitor will print the received events for:
>   KERNEL - the kernel uevent
>
>   KERNEL[625.301042] add      /devices/pci0000:00/0000:00:02.0/0000:01:00.1/net/enp1s0f1 (net)
>   KERNEL[625.301109] move     /devices/pci0000:00/0000:00:02.0/0000:01:00.1/net/enp1s0f1 (net)
>   KERNEL[625.301138] move     /devices/pci0000:00/0000:00:02.0/0000:01:00.1/net/eth1 (net)
>   KERNEL[655.333272] remove /devices/pci0000:00/0000:00:02.0/0000:01:00.1/net/eth1 (net)
>
> Thanks!
> Christian
>
> [1]: https://lkml.org/lkml/2018/4/4/739
> [2]: https://lkml.org/lkml/2018/4/26/767
> [3]: https://lkml.org/lkml/2018/4/26/738

Acked-by: "Eric W. Biederman" <ebiederm@...ssion.com>

>
> Christian Brauner (2):
>   uevent: add alloc_uevent_skb() helper
>   netns: restrict uevents
>
>  lib/kobject_uevent.c | 178 ++++++++++++++++++++++++++++++-------------
>  1 file changed, 126 insertions(+), 52 deletions(-)

Eric