[PATCH net-next v10 04/13] ieee802154: 6lowpan: Validate link netns in newlink() of rtnl_link_ops
From: Xiao Liang <hidden>
Date: 2025-02-19 12:51:31
Also in:
batman, bpf, bridge, linux-can, linux-kselftest, linux-rdma, linux-wireless, lkml
Subsystem:
ieee 802.15.4 subsystem, networking [general], the rest · Maintainers:
Alexander Aring, Stefan Schmidt, Miquel Raynal, "David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Linus Torvalds
Device denoted by IFLA_LINK is in link_net (IFLA_LINK_NETNSID) or source netns by design, but 6lowpan uses dev_net. Note dev->netns_local is set to true and currently link_net is implemented via a netns change. These together effectively reject IFLA_LINK_NETNSID. This patch adds a validation to ensure link_net is either NULL or identical to dev_net. Thus it would be fine to continue using dev_net when rtnetlink core begins to create devices directly in target netns. Signed-off-by: Xiao Liang <redacted> Reviewed-by: Kuniyuki Iwashima <redacted> --- net/ieee802154/6lowpan/core.c | 2 ++ 1 file changed, 2 insertions(+)
diff --git a/net/ieee802154/6lowpan/core.c b/net/ieee802154/6lowpan/core.c
index 704bf9e3f097..ee318d46817d 100644
--- a/net/ieee802154/6lowpan/core.c
+++ b/net/ieee802154/6lowpan/core.c@@ -143,6 +143,8 @@ static int lowpan_newlink(struct net_device *ldev, if (!tb[IFLA_LINK]) return -EINVAL; + if (params->link_net && !net_eq(params->link_net, dev_net(ldev))) + return -EINVAL; /* find and hold wpan device */ wdev = dev_get_by_index(dev_net(ldev), nla_get_u32(tb[IFLA_LINK])); if (!wdev)
--
2.48.1