tipc: fix a deadlock when flushing scheduled work

In the commit fdeba99b1e58
("tipc: fix use-after-free in tipc_bcast_get_mode"), we're trying
to make sure the tipc_net_finalize_work work item finished if it
enqueued. But calling flush_scheduled_work() is not just affecting
above work item but either any scheduled work. This has turned out
to be overkill and caused to deadlock as syzbot reported:

======================================================
WARNING: possible circular locking dependency detected
5.9.0-rc2-next-20200828-syzkaller #0 Not tainted
------------------------------------------------------
kworker/u4:6/349 is trying to acquire lock:
ffff8880aa063d38 ((wq_completion)events){+.+.}-{0:0}, at: flush_workqueue+0xe1/0x13e0 kernel/workqueue.c:2777

but task is already holding lock:
ffffffff8a879430 (pernet_ops_rwsem){++++}-{3:3}, at: cleanup_net+0x9b/0xb10 net/core/net_namespace.c:565

[...]
 Possible unsafe locking scenario:

       CPU0                    CPU1
       ----                    ----
  lock(pernet_ops_rwsem);
                               lock(&sb->s_type->i_mutex_key#13);
                               lock(pernet_ops_rwsem);
  lock((wq_completion)events);

 *** DEADLOCK ***
[...]

v1:
To fix the original issue, we replace above calling by introducing
a bit flag. When a namespace cleaned-up, bit flag is set to zero and:
- tipc_net_finalize functionial just does return immediately.
- tipc_net_finalize_work does not enqueue into the scheduled work queue.

v2:
Use cancel_work_sync() helper to make sure ONLY the
tipc_net_finalize_work() stopped before releasing bcbase object.

Reported-by: syzbot+d5aa7e0385f6a5d0f4fd@syzkaller.appspotmail.com
Fixes: fdeba99b1e58 ("tipc: fix use-after-free in tipc_bcast_get_mode")
Acked-by: Jon Maloy <jmaloy@redhat.com>
Signed-off-by: Hoang Huu Le <hoang.h.le@dektech.com.au>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

diff --git a/net/tipc/core.c b/net/tipc/core.c
index 37d8695..c2ff429 100644 (file)
--- a/net/tipc/core.c
+++ b/net/tipc/core.c
@@ -60,6 +60,7 @@ static int __net_init tipc_init_net(struct net *net)
        tn->trial_addr = 0;
        tn->addr_trial_end = 0;
        tn->capabilities = TIPC_NODE_CAPABILITIES;
+       INIT_WORK(&tn->final_work.work, tipc_net_finalize_work);
        memset(tn->node_id, 0, sizeof(tn->node_id));
        memset(tn->node_id_string, 0, sizeof(tn->node_id_string));
        tn->mon_threshold = TIPC_DEF_MON_THRESHOLD;
@@ -107,13 +108,13 @@ out_crypto:
 
 static void __net_exit tipc_exit_net(struct net *net)
 {
+       struct tipc_net *tn = tipc_net(net);
+
        tipc_detach_loopback(net);
+       /* Make sure the tipc_net_finalize_work() finished */
+       cancel_work_sync(&tn->final_work.work);
        tipc_net_stop(net);
 
-       /* Make sure the tipc_net_finalize_work stopped
-        * before releasing the resources.
-        */
-       flush_scheduled_work();
        tipc_bcast_stop(net);
        tipc_nametbl_stop(net);
        tipc_sk_rht_destroy(net);

diff --git a/net/tipc/core.h b/net/tipc/core.h
index 631d83c..1d57a4d 100644 (file)
--- a/net/tipc/core.h
+++ b/net/tipc/core.h
@@ -90,6 +90,12 @@ extern unsigned int tipc_net_id __read_mostly;
 extern int sysctl_tipc_rmem[3] __read_mostly;
 extern int sysctl_tipc_named_timeout __read_mostly;
 
+struct tipc_net_work {
+       struct work_struct work;
+       struct net *net;
+       u32 addr;
+};
+
 struct tipc_net {
        u8  node_id[NODE_ID_LEN];
        u32 node_addr;
@@ -143,6 +149,8 @@ struct tipc_net {
        /* TX crypto handler */
        struct tipc_crypto *crypto_tx;
 #endif
+       /* Work item for net finalize */
+       struct tipc_net_work final_work;
 };
 
 static inline struct tipc_net *tipc_net(struct net *net)

diff --git a/net/tipc/net.c b/net/tipc/net.c
index 85400e4..0bb2323 100644 (file)
--- a/net/tipc/net.c
+++ b/net/tipc/net.c
@@ -105,12 +105,6 @@
  *     - A local spin_lock protecting the queue of subscriber events.
 */
 
-struct tipc_net_work {
-       struct work_struct work;
-       struct net *net;
-       u32 addr;
-};
-
 static void tipc_net_finalize(struct net *net, u32 addr);
 
 int tipc_net_init(struct net *net, u8 *node_id, u32 addr)
@@ -142,25 +136,21 @@ static void tipc_net_finalize(struct net *net, u32 addr)
                             TIPC_CLUSTER_SCOPE, 0, addr);
 }
 
-static void tipc_net_finalize_work(struct work_struct *work)
+void tipc_net_finalize_work(struct work_struct *work)
 {
        struct tipc_net_work *fwork;
 
        fwork = container_of(work, struct tipc_net_work, work);
        tipc_net_finalize(fwork->net, fwork->addr);
-       kfree(fwork);
 }
 
 void tipc_sched_net_finalize(struct net *net, u32 addr)
 {
-       struct tipc_net_work *fwork = kzalloc(sizeof(*fwork), GFP_ATOMIC);
+       struct tipc_net *tn = tipc_net(net);
 
-       if (!fwork)
-               return;
-       INIT_WORK(&fwork->work, tipc_net_finalize_work);
-       fwork->net = net;
-       fwork->addr = addr;
-       schedule_work(&fwork->work);
+       tn->final_work.net = net;
+       tn->final_work.addr = addr;
+       schedule_work(&tn->final_work.work);
 }
 
 void tipc_net_stop(struct net *net)

diff --git a/net/tipc/net.h b/net/tipc/net.h
index 6740d97..d0c91d2 100644 (file)
--- a/net/tipc/net.h
+++ b/net/tipc/net.h
@@ -42,6 +42,7 @@
 extern const struct nla_policy tipc_nl_net_policy[];
 
 int tipc_net_init(struct net *net, u8 *node_id, u32 addr);
+void tipc_net_finalize_work(struct work_struct *work);
 void tipc_sched_net_finalize(struct net *net, u32 addr);
 void tipc_net_stop(struct net *net);
 int tipc_nl_net_dump(struct sk_buff *skb, struct netlink_callback *cb);