libceph: clear msg->con in ceph_msg_release() only

The following bit in ceph_msg_revoke_incoming() is unsafe:

    struct ceph_connection *con = msg->con;
    if (!con)
            return;
    mutex_lock(&con->mutex);
    <more msg->con use>

There is nothing preventing con from getting destroyed right after
msg->con test.  One easy way to reproduce this is to disable message
signing only on the server side and try to map an image.  The system
will go into a

    libceph: read_partial_message ffff880073f0ab68 signature check failed
    libceph: osd0 192.168.255.155:6801 bad crc/signature
    libceph: read_partial_message ffff880073f0ab68 signature check failed
    libceph: osd0 192.168.255.155:6801 bad crc/signature

loop which has to be interrupted with Ctrl-C.  Hit Ctrl-C and you are
likely to end up with a random GP fault if the reset handler executes
"within" ceph_msg_revoke_incoming():

                     <yet another reply w/o a signature>
                                   ...
          <Ctrl-C>
    rbd_obj_request_end
      ceph_osdc_cancel_request
        __unregister_request
          ceph_osdc_put_request
            ceph_msg_revoke_incoming
                                   ...
                                osd_reset
                                  __kick_osd_requests
                                    __reset_osd
                                      remove_osd
                                        ceph_con_close
                                          reset_connection
                                            <clear con->in_msg->con>
                                            <put con ref>
                                              put_osd
                                                <free osd/con>
              <msg->con use> <-- !!!

If ceph_msg_revoke_incoming() executes "before" the reset handler,
osd/con will be leaked because ceph_msg_revoke_incoming() clears
con->in_msg but doesn't put con ref, while reset_connection() only puts
con ref if con->in_msg != NULL.

The current msg->con scheme was introduced by commits 38941f8031bf
("libceph: have messages point to their connection") and 92ce034b5a74
("libceph: have messages take a connection reference"), which defined
when messages get associated with a connection and when that
association goes away.  Part of the problem is that this association is
supposed to go away in much too many places; closing this race entirely
requires either a rework of the existing or an addition of a new layer
of synchronization.

In lieu of that, we can make it *much* less likely to hit by
disassociating messages only on their destruction and resend through
a different connection.  This makes the code simpler and is probably
a good thing to do regardless - this patch adds a msg_con_set() helper
which is is called from only three places: ceph_con_send() and
ceph_con_in_msg_alloc() to set msg->con and ceph_msg_release() to clear
it.

Signed-off-by: Ilya Dryomov <idryomov@gmail.com>

2 files changed, 20 insertions, 28 deletions

diff --git a/net/ceph/messenger.c b/net/ceph/messenger.c
index 0cc5608b2c8f..9981039ef4ff 100644
--- a/net/ceph/messenger.c
+++ b/net/ceph/messenger.c
@@ -637,9 +637,6 @@ static int con_close_socket(struct ceph_connection *con)
 static void ceph_msg_remove(struct ceph_msg *msg)
 {
         list_del_init(&msg->list_head);
-        BUG_ON(msg->con == NULL);
-        msg->con->ops->put(msg->con);
-        msg->con = NULL;
 
         ceph_msg_put(msg);
 }
@@ -662,15 +659,14 @@ static void reset_connection(struct ceph_connection *con)
 
         if (con->in_msg) {
                 BUG_ON(con->in_msg->con != con);
-                con->in_msg->con = NULL;
                 ceph_msg_put(con->in_msg);
                 con->in_msg = NULL;
-                con->ops->put(con);
         }
 
         con->connect_seq = 0;
         con->out_seq = 0;
         if (con->out_msg) {
+                BUG_ON(con->out_msg->con != con);
                 ceph_msg_put(con->out_msg);
                 con->out_msg = NULL;
         }
@@ -2438,13 +2434,10 @@ static int read_partial_message(struct ceph_connection *con)
  */
 static void process_message(struct ceph_connection *con)
 {
-        struct ceph_msg *msg;
+        struct ceph_msg *msg = con->in_msg;
 
         BUG_ON(con->in_msg->con != con);
-        con->in_msg->con = NULL;
-        msg = con->in_msg;
         con->in_msg = NULL;
-        con->ops->put(con);
 
         /* if first message, set peer_name */
         if (con->peer_name.type == 0)
@@ -2918,10 +2911,8 @@ static void con_fault(struct ceph_connection *con)
 
         if (con->in_msg) {
                 BUG_ON(con->in_msg->con != con);
-                con->in_msg->con = NULL;
                 ceph_msg_put(con->in_msg);
                 con->in_msg = NULL;
-                con->ops->put(con);
         }
 
         /* Requeue anything that hasn't been acked */
@@ -2977,6 +2968,15 @@ void ceph_messenger_fini(struct ceph_messenger *msgr)
 }
 EXPORT_SYMBOL(ceph_messenger_fini);
 
+static void msg_con_set(struct ceph_msg *msg, struct ceph_connection *con)
+{
+        if (msg->con)
+                msg->con->ops->put(msg->con);
+
+        msg->con = con ? con->ops->get(con) : NULL;
+        BUG_ON(msg->con != con);
+}
+
 static void clear_standby(struct ceph_connection *con)
 {
         /* come back from STANDBY? */
@@ -3008,9 +3008,7 @@ void ceph_con_send(struct ceph_connection *con, struct ceph_msg *msg)
                 return;
         }
 
-        BUG_ON(msg->con != NULL);
-        msg->con = con->ops->get(con);
-        BUG_ON(msg->con == NULL);
+        msg_con_set(msg, con);
 
         BUG_ON(!list_empty(&msg->list_head));
         list_add_tail(&msg->list_head, &con->out_queue);
@@ -3038,16 +3036,15 @@ void ceph_msg_revoke(struct ceph_msg *msg)
 {
         struct ceph_connection *con = msg->con;
 
-        if (!con)
+        if (!con) {
+                dout("%s msg %p null con\n", __func__, msg);
                 return;         /* Message not in our possession */
+        }
 
         mutex_lock(&con->mutex);
         if (!list_empty(&msg->list_head)) {
                 dout("%s %p msg %p - was on queue\n", __func__, con, msg);
                 list_del_init(&msg->list_head);
-                BUG_ON(msg->con == NULL);
-                msg->con->ops->put(msg->con);
-                msg->con = NULL;
                 msg->hdr.seq = 0;
 
                 ceph_msg_put(msg);
@@ -3071,16 +3068,13 @@ void ceph_msg_revoke(struct ceph_msg *msg)
  */
 void ceph_msg_revoke_incoming(struct ceph_msg *msg)
 {
-        struct ceph_connection *con;
+        struct ceph_connection *con = msg->con;
 
-        BUG_ON(msg == NULL);
-        if (!msg->con) {
+        if (!con) {
                 dout("%s msg %p null con\n", __func__, msg);
-
                 return;         /* Message not in our possession */
         }
 
-        con = msg->con;
         mutex_lock(&con->mutex);
         if (con->in_msg == msg) {
                 unsigned int front_len = le32_to_cpu(con->in_hdr.front_len);
@@ -3326,9 +3320,8 @@ static int ceph_con_in_msg_alloc(struct ceph_connection *con, int *skip)
         }
         if (msg) {
                 BUG_ON(*skip);
+                msg_con_set(msg, con);
                 con->in_msg = msg;
-                con->in_msg->con = con->ops->get(con);
-                BUG_ON(con->in_msg->con == NULL);
         } else {
                 /*
                  * Null message pointer means either we should skip
@@ -3375,6 +3368,8 @@ static void ceph_msg_release(struct kref *kref)
         dout("%s %p\n", __func__, m);
         WARN_ON(!list_empty(&m->list_head));
 
+        msg_con_set(m, NULL);
+
         /* drop middle, data, if any */
         if (m->middle) {
                 ceph_buffer_put(m->middle);
diff --git a/net/ceph/osd_client.c b/net/ceph/osd_client.c
index 118e4ce37ecc..f8f235930d88 100644
--- a/net/ceph/osd_client.c
+++ b/net/ceph/osd_client.c
@@ -2850,9 +2850,6 @@ static struct ceph_msg *get_reply(struct ceph_connection *con,
                 goto out;
         }
 
-        if (req->r_reply->con)
-                dout("%s revoking msg %p from old con %p\n", __func__,
-                     req->r_reply, req->r_reply->con);
         ceph_msg_revoke_incoming(req->r_reply);
 
         if (front_len > req->r_reply->front_alloc_len) {