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| author | Eric Dumazet <edumazet@google.com> | 2025-02-07 13:58:37 +0000 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2025-02-21 14:01:43 +0100 |
| commit | a849a10de5e04d798f7f286a2f1ca174719a617a (patch) | |
| tree | 50bedc613e8a09dab4b4a1c144154e386094f8ba /net | |
| parent | 01d1b5c9abcaff29a43f1d17a19c33eec92c7dbe (diff) | |
| download | linux-a849a10de5e04d798f7f286a2f1ca174719a617a.tar.gz linux-a849a10de5e04d798f7f286a2f1ca174719a617a.tar.bz2 linux-a849a10de5e04d798f7f286a2f1ca174719a617a.zip | |
openvswitch: use RCU protection in ovs_vport_cmd_fill_info()
[ Upstream commit 90b2f49a502fa71090d9f4fe29a2f51fe5dff76d ]
ovs_vport_cmd_fill_info() can be called without RTNL or RCU.
Use RCU protection and dev_net_rcu() to avoid potential UAF.
Fixes: 9354d4520342 ("openvswitch: reliable interface indentification in port dumps")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Reviewed-by: Kuniyuki Iwashima <kuniyu@amazon.com>
Link: https://patch.msgid.link/20250207135841.1948589-6-edumazet@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'net')
| -rw-r--r-- | net/openvswitch/datapath.c | 12 |
1 files changed, 9 insertions, 3 deletions
diff --git a/net/openvswitch/datapath.c b/net/openvswitch/datapath.c index 78d9961fcd44..8d3c01f0e2aa 100644 --- a/net/openvswitch/datapath.c +++ b/net/openvswitch/datapath.c @@ -2102,6 +2102,7 @@ static int ovs_vport_cmd_fill_info(struct vport *vport, struct sk_buff *skb, { struct ovs_header *ovs_header; struct ovs_vport_stats vport_stats; + struct net *net_vport; int err; ovs_header = genlmsg_put(skb, portid, seq, &dp_vport_genl_family, @@ -2118,12 +2119,15 @@ static int ovs_vport_cmd_fill_info(struct vport *vport, struct sk_buff *skb, nla_put_u32(skb, OVS_VPORT_ATTR_IFINDEX, vport->dev->ifindex)) goto nla_put_failure; - if (!net_eq(net, dev_net(vport->dev))) { - int id = peernet2id_alloc(net, dev_net(vport->dev), gfp); + rcu_read_lock(); + net_vport = dev_net_rcu(vport->dev); + if (!net_eq(net, net_vport)) { + int id = peernet2id_alloc(net, net_vport, GFP_ATOMIC); if (nla_put_s32(skb, OVS_VPORT_ATTR_NETNSID, id)) - goto nla_put_failure; + goto nla_put_failure_unlock; } + rcu_read_unlock(); ovs_vport_get_stats(vport, &vport_stats); if (nla_put_64bit(skb, OVS_VPORT_ATTR_STATS, @@ -2144,6 +2148,8 @@ static int ovs_vport_cmd_fill_info(struct vport *vport, struct sk_buff *skb, genlmsg_end(skb, ovs_header); return 0; +nla_put_failure_unlock: + rcu_read_unlock(); nla_put_failure: err = -EMSGSIZE; error: |