[PATCH v3] openvswitch: allow management from inside user namespaces
pravin shelar
pshelar at ovn.org
Thu Feb 11 09:10:59 UTC 2016
On Fri, Feb 5, 2016 at 5:20 PM, Tycho Andersen
<tycho.andersen at canonical.com> wrote:
> Operations with the GENL_ADMIN_PERM flag fail permissions checks because
> this flag means we call netlink_capable, which uses the init user ns.
>
> Instead, let's introduce a new flag, GENL_UNS_ADMIN_PERM for operations
> which should be allowed inside a user namespace.
>
> The motivation for this is to be able to run openvswitch in unprivileged
> containers. I've tested this and it seems to work, but I really have no
> idea about the security consequences of this patch, so thoughts would be
> much appreciated.
>
> v2: use the GENL_UNS_ADMIN_PERM flag instead of a check in each function
> v3: use separate ifs for UNS_ADMIN_PERM and ADMIN_PERM, instead of one
> massive one
>
> Reported-by: James Page <james.page at canonical.com>
> Signed-off-by: Tycho Andersen <tycho.andersen at canonical.com>
> CC: Eric Biederman <ebiederm at xmission.com>
> CC: Pravin Shelar <pshelar at ovn.org>
> CC: Justin Pettit <jpettit at nicira.com>
> CC: "David S. Miller" <davem at davemloft.net>
> ---
> include/uapi/linux/genetlink.h | 1 +
> net/netlink/genetlink.c | 4 ++++
> net/openvswitch/datapath.c | 20 ++++++++++----------
> 3 files changed, 15 insertions(+), 10 deletions(-)
>
Looks good.
Acked-by: Pravin B Shelar <pshelar at ovn.org>
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