netns: revert "netns: avoid disabling irq for netns id"
This reverts commit bc51dddf98
("netns: avoid disabling irq for
netns id") as it was found to cause problems with systems running
SELinux/audit, see the mailing list thread below:
* http://marc.info/?t=147694653900002&r=1&w=2
Eventually we should be able to reintroduce this code once we have
rewritten the audit multicast code to queue messages much the same
way we do for unicast messages. A tracking issue for this can be
found below:
* https://github.com/linux-audit/audit-kernel/issues/23
Reported-by: Stephen Smalley <sds@tycho.nsa.gov>
Reported-by: Elad Raz <e@eladraz.com>
Cc: Cong Wang <xiyou.wangcong@gmail.com>
Signed-off-by: Paul Moore <paul@paul-moore.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
parent
8651be8f14
commit
2a73306b60
1 changed files with 20 additions and 15 deletions
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@ -215,13 +215,14 @@ static void rtnl_net_notifyid(struct net *net, int cmd, int id);
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*/
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int peernet2id_alloc(struct net *net, struct net *peer)
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{
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unsigned long flags;
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bool alloc;
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int id;
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spin_lock_bh(&net->nsid_lock);
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spin_lock_irqsave(&net->nsid_lock, flags);
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alloc = atomic_read(&peer->count) == 0 ? false : true;
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id = __peernet2id_alloc(net, peer, &alloc);
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spin_unlock_bh(&net->nsid_lock);
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spin_unlock_irqrestore(&net->nsid_lock, flags);
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if (alloc && id >= 0)
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rtnl_net_notifyid(net, RTM_NEWNSID, id);
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return id;
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@ -230,11 +231,12 @@ int peernet2id_alloc(struct net *net, struct net *peer)
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/* This function returns, if assigned, the id of a peer netns. */
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int peernet2id(struct net *net, struct net *peer)
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{
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unsigned long flags;
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int id;
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spin_lock_bh(&net->nsid_lock);
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spin_lock_irqsave(&net->nsid_lock, flags);
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id = __peernet2id(net, peer);
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spin_unlock_bh(&net->nsid_lock);
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spin_unlock_irqrestore(&net->nsid_lock, flags);
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return id;
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}
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EXPORT_SYMBOL(peernet2id);
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@ -249,17 +251,18 @@ bool peernet_has_id(struct net *net, struct net *peer)
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struct net *get_net_ns_by_id(struct net *net, int id)
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{
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unsigned long flags;
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struct net *peer;
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if (id < 0)
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return NULL;
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rcu_read_lock();
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spin_lock_bh(&net->nsid_lock);
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spin_lock_irqsave(&net->nsid_lock, flags);
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peer = idr_find(&net->netns_ids, id);
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if (peer)
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get_net(peer);
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spin_unlock_bh(&net->nsid_lock);
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spin_unlock_irqrestore(&net->nsid_lock, flags);
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rcu_read_unlock();
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return peer;
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@ -422,17 +425,17 @@ static void cleanup_net(struct work_struct *work)
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for_each_net(tmp) {
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int id;
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spin_lock_bh(&tmp->nsid_lock);
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spin_lock_irq(&tmp->nsid_lock);
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id = __peernet2id(tmp, net);
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if (id >= 0)
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idr_remove(&tmp->netns_ids, id);
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spin_unlock_bh(&tmp->nsid_lock);
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spin_unlock_irq(&tmp->nsid_lock);
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if (id >= 0)
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rtnl_net_notifyid(tmp, RTM_DELNSID, id);
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}
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spin_lock_bh(&net->nsid_lock);
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spin_lock_irq(&net->nsid_lock);
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idr_destroy(&net->netns_ids);
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spin_unlock_bh(&net->nsid_lock);
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spin_unlock_irq(&net->nsid_lock);
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}
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rtnl_unlock();
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@ -561,6 +564,7 @@ static int rtnl_net_newid(struct sk_buff *skb, struct nlmsghdr *nlh)
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{
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struct net *net = sock_net(skb->sk);
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struct nlattr *tb[NETNSA_MAX + 1];
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unsigned long flags;
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struct net *peer;
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int nsid, err;
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@ -581,15 +585,15 @@ static int rtnl_net_newid(struct sk_buff *skb, struct nlmsghdr *nlh)
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if (IS_ERR(peer))
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return PTR_ERR(peer);
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spin_lock_bh(&net->nsid_lock);
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spin_lock_irqsave(&net->nsid_lock, flags);
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if (__peernet2id(net, peer) >= 0) {
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spin_unlock_bh(&net->nsid_lock);
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spin_unlock_irqrestore(&net->nsid_lock, flags);
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err = -EEXIST;
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goto out;
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}
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err = alloc_netid(net, peer, nsid);
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spin_unlock_bh(&net->nsid_lock);
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spin_unlock_irqrestore(&net->nsid_lock, flags);
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if (err >= 0) {
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rtnl_net_notifyid(net, RTM_NEWNSID, err);
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err = 0;
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@ -711,10 +715,11 @@ static int rtnl_net_dumpid(struct sk_buff *skb, struct netlink_callback *cb)
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.idx = 0,
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.s_idx = cb->args[0],
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};
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unsigned long flags;
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spin_lock_bh(&net->nsid_lock);
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spin_lock_irqsave(&net->nsid_lock, flags);
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idr_for_each(&net->netns_ids, rtnl_net_dumpid_one, &net_cb);
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spin_unlock_bh(&net->nsid_lock);
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spin_unlock_irqrestore(&net->nsid_lock, flags);
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cb->args[0] = net_cb.idx;
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return skb->len;
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