From: Alexey Dobriyan <[email protected]>
1. After sock_register() returns, it's possible to create sockets,
even if module still not initialized fully (blame generic module code
for that!)
2. Consequently, pfkey_create() can be called with pfkey_net_id still not
initialized which will BUG_ON in net_generic():
kernel BUG at include/net/netns/generic.h:43!
3. During netns shutdown, netns ops should be unregistered after
key manager unregistered because key manager calls can be triggered
from xfrm_user module:
general protection fault: 0000 [#1] PREEMPT SMP DEBUG_PAGEALLOC
pfkey_broadcast+0x111/0x210 [af_key]
pfkey_send_notify+0x16a/0x300 [af_key]
km_state_notify+0x41/0x70
xfrm_flush_sa+0x75/0x90 [xfrm_user]
4. Unregister netns ops after socket ops just in case and for symmetry.
Reported by Luca Tettamanti.
Signed-off-by: Alexey Dobriyan <[email protected]>
Tested-by: Luca Tettamanti <[email protected]>
Signed-off-by: Eric Dumazet <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
net/key/af_key.c | 15 ++++++++-------
1 files changed, 8 insertions(+), 7 deletions(-)
---
http://git.linuxtv.org/v4l-dvb.git?a=commitdiff;h=180211b841b5bf13ab10d19202adab3eb7749f6c
diff --git a/net/key/af_key.c b/net/key/af_key.c
index 76fa6fe..539f43b 100644
--- a/net/key/af_key.c
+++ b/net/key/af_key.c
@@ -3794,9 +3794,9 @@ static struct pernet_operations pfkey_net_ops = {
static void __exit ipsec_pfkey_exit(void)
{
- unregister_pernet_subsys(&pfkey_net_ops);
xfrm_unregister_km(&pfkeyv2_mgr);
sock_unregister(PF_KEY);
+ unregister_pernet_subsys(&pfkey_net_ops);
proto_unregister(&key_proto);
}
@@ -3807,21 +3807,22 @@ static int __init ipsec_pfkey_init(void)
if (err != 0)
goto out;
- err = sock_register(&pfkey_family_ops);
+ err = register_pernet_subsys(&pfkey_net_ops);
if (err != 0)
goto out_unregister_key_proto;
+ err = sock_register(&pfkey_family_ops);
+ if (err != 0)
+ goto out_unregister_pernet;
err = xfrm_register_km(&pfkeyv2_mgr);
if (err != 0)
goto out_sock_unregister;
- err = register_pernet_subsys(&pfkey_net_ops);
- if (err != 0)
- goto out_xfrm_unregister_km;
out:
return err;
-out_xfrm_unregister_km:
- xfrm_unregister_km(&pfkeyv2_mgr);
+
out_sock_unregister:
sock_unregister(PF_KEY);
+out_unregister_pernet:
+ unregister_pernet_subsys(&pfkey_net_ops);
out_unregister_key_proto:
proto_unregister(&key_proto);
goto out;
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