diff options
| author | Guillaume Nault <gnault@redhat.com> | 2019-10-23 18:39:04 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-11-10 11:34:38 +0100 |
| commit | f10bbdd2c539f7b47086d2f79703de04f889eb81 (patch) | |
| tree | 43ed0099fe9d0522dfbbf4d9525cecc46b5c83d0 /include/net | |
| parent | 02ccce8bb95c5a9c0fcf886790dd98d910ecb064 (diff) | |
netns: fix GFP flags in rtnl_net_notifyid()
[ Upstream commit d4e4fdf9e4a27c87edb79b1478955075be141f67 ]
In rtnl_net_notifyid(), we certainly can't pass a null GFP flag to
rtnl_notify(). A GFP_KERNEL flag would be fine in most circumstances,
but there are a few paths calling rtnl_net_notifyid() from atomic
context or from RCU critical sections. The later also precludes the use
of gfp_any() as it wouldn't detect the RCU case. Also, the nlmsg_new()
call is wrong too, as it uses GFP_KERNEL unconditionally.
Therefore, we need to pass the GFP flags as parameter and propagate it
through function calls until the proper flags can be determined.
In most cases, GFP_KERNEL is fine. The exceptions are:
* openvswitch: ovs_vport_cmd_get() and ovs_vport_cmd_dump()
indirectly call rtnl_net_notifyid() from RCU critical section,
* rtnetlink: rtmsg_ifinfo_build_skb() already receives GFP flags as
parameter.
Also, in ovs_vport_cmd_build_info(), let's change the GFP flags used
by nlmsg_new(). The function is allowed to sleep, so better make the
flags consistent with the ones used in the following
ovs_vport_cmd_fill_info() call.
Found by code inspection.
Fixes: 9a9634545c70 ("netns: notify netns id events")
Signed-off-by: Guillaume Nault <gnault@redhat.com>
Acked-by: Nicolas Dichtel <nicolas.dichtel@6wind.com>
Acked-by: Pravin B Shelar <pshelar@ovn.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'include/net')
| -rw-r--r-- | include/net/net_namespace.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/include/net/net_namespace.h b/include/net/net_namespace.h index ab40d7afdc54..f1f3438ed13a 100644 --- a/include/net/net_namespace.h +++ b/include/net/net_namespace.h @@ -333,7 +333,7 @@ static inline struct net *read_pnet(const possible_net_t *pnet) #define __net_initconst __initconst #endif -int peernet2id_alloc(struct net *net, struct net *peer); +int peernet2id_alloc(struct net *net, struct net *peer, gfp_t gfp); int peernet2id(struct net *net, struct net *peer); bool peernet_has_id(struct net *net, struct net *peer); struct net *get_net_ns_by_id(struct net *net, int id); |