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authorDenis V. Lunev <den@openvz.org>2008-01-19 10:55:19 +0300
committerDavid S. Miller <davem@davemloft.net>2008-01-29 02:08:08 +0300
commit775516bfa2bd7993620c9039191a0c30b8d8a496 (patch)
tree7385f35edda9f4124b802ccf337c55070d2e00bc /net/core
parentb7c6ba6eb1234e35a74fb8ba8123232a7b1ba9e4 (diff)
downloadlinux-775516bfa2bd7993620c9039191a0c30b8d8a496.tar.xz
[NETNS]: Namespace stop vs 'ip r l' race.
During network namespace stop process kernel side netlink sockets belonging to a namespace should be closed. They should not prevent namespace to stop, so they do not increment namespace usage counter. Though this counter will be put during last sock_put. The raplacement of the correct netns for init_ns solves the problem only partial as socket to be stoped until proper stop is a valid netlink kernel socket and can be looked up by the user processes. This is not a problem until it resides in initial namespace (no processes inside this net), but this is not true for init_net. So, hold the referrence for a socket, remove it from lookup tables and only after that change namespace and perform a last put. Signed-off-by: Denis V. Lunev <den@openvz.org> Tested-by: Alexey Dobriyan <adobriyan@openvz.org> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/core')
-rw-r--r--net/core/rtnetlink.c15
1 files changed, 2 insertions, 13 deletions
diff --git a/net/core/rtnetlink.c b/net/core/rtnetlink.c
index 02cf848f71d2..ddbdde82a700 100644
--- a/net/core/rtnetlink.c
+++ b/net/core/rtnetlink.c
@@ -1368,25 +1368,14 @@ static int rtnetlink_net_init(struct net *net)
rtnetlink_rcv, &rtnl_mutex, THIS_MODULE);
if (!sk)
return -ENOMEM;
-
- /* Don't hold an extra reference on the namespace */
- put_net(sk->sk_net);
net->rtnl = sk;
return 0;
}
static void rtnetlink_net_exit(struct net *net)
{
- struct sock *sk = net->rtnl;
- if (sk) {
- /* At the last minute lie and say this is a socket for the
- * initial network namespace. So the socket will be safe to
- * free.
- */
- sk->sk_net = get_net(&init_net);
- netlink_kernel_release(net->rtnl);
- net->rtnl = NULL;
- }
+ netlink_kernel_release(net->rtnl);
+ net->rtnl = NULL;
}
static struct pernet_operations rtnetlink_net_ops = {