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Message-Id: <20200918021455.2067301-28-sashal@kernel.org>
Date: Thu, 17 Sep 2020 22:13:53 -0400
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc: Manish Mandlik <mmandlik@...gle.com>,
Marcel Holtmann <marcel@...tmann.org>,
Sasha Levin <sashal@...nel.org>,
linux-bluetooth@...r.kernel.org, netdev@...r.kernel.org
Subject: [PATCH AUTOSEL 4.9 28/90] Bluetooth: Fix refcount use-after-free issue
From: Manish Mandlik <mmandlik@...gle.com>
[ Upstream commit 6c08fc896b60893c5d673764b0668015d76df462 ]
There is no lock preventing both l2cap_sock_release() and
chan->ops->close() from running at the same time.
If we consider Thread A running l2cap_chan_timeout() and Thread B running
l2cap_sock_release(), expected behavior is:
A::l2cap_chan_timeout()->l2cap_chan_close()->l2cap_sock_teardown_cb()
A::l2cap_chan_timeout()->l2cap_sock_close_cb()->l2cap_sock_kill()
B::l2cap_sock_release()->sock_orphan()
B::l2cap_sock_release()->l2cap_sock_kill()
where,
sock_orphan() clears "sk->sk_socket" and l2cap_sock_teardown_cb() marks
socket as SOCK_ZAPPED.
In l2cap_sock_kill(), there is an "if-statement" that checks if both
sock_orphan() and sock_teardown() has been run i.e. sk->sk_socket is NULL
and socket is marked as SOCK_ZAPPED. Socket is killed if the condition is
satisfied.
In the race condition, following occurs:
A::l2cap_chan_timeout()->l2cap_chan_close()->l2cap_sock_teardown_cb()
B::l2cap_sock_release()->sock_orphan()
B::l2cap_sock_release()->l2cap_sock_kill()
A::l2cap_chan_timeout()->l2cap_sock_close_cb()->l2cap_sock_kill()
In this scenario, "if-statement" is true in both B::l2cap_sock_kill() and
A::l2cap_sock_kill() and we hit "refcount: underflow; use-after-free" bug.
Similar condition occurs at other places where teardown/sock_kill is
happening:
l2cap_disconnect_rsp()->l2cap_chan_del()->l2cap_sock_teardown_cb()
l2cap_disconnect_rsp()->l2cap_sock_close_cb()->l2cap_sock_kill()
l2cap_conn_del()->l2cap_chan_del()->l2cap_sock_teardown_cb()
l2cap_conn_del()->l2cap_sock_close_cb()->l2cap_sock_kill()
l2cap_disconnect_req()->l2cap_chan_del()->l2cap_sock_teardown_cb()
l2cap_disconnect_req()->l2cap_sock_close_cb()->l2cap_sock_kill()
l2cap_sock_cleanup_listen()->l2cap_chan_close()->l2cap_sock_teardown_cb()
l2cap_sock_cleanup_listen()->l2cap_sock_kill()
Protect teardown/sock_kill and orphan/sock_kill by adding hold_lock on
l2cap channel to ensure that the socket is killed only after marked as
zapped and orphan.
Signed-off-by: Manish Mandlik <mmandlik@...gle.com>
Signed-off-by: Marcel Holtmann <marcel@...tmann.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
net/bluetooth/l2cap_core.c | 26 +++++++++++++++-----------
net/bluetooth/l2cap_sock.c | 16 +++++++++++++---
2 files changed, 28 insertions(+), 14 deletions(-)
diff --git a/net/bluetooth/l2cap_core.c b/net/bluetooth/l2cap_core.c
index 11012a5090708..de085947c19c2 100644
--- a/net/bluetooth/l2cap_core.c
+++ b/net/bluetooth/l2cap_core.c
@@ -414,6 +414,9 @@ static void l2cap_chan_timeout(struct work_struct *work)
BT_DBG("chan %p state %s", chan, state_to_string(chan->state));
mutex_lock(&conn->chan_lock);
+ /* __set_chan_timer() calls l2cap_chan_hold(chan) while scheduling
+ * this work. No need to call l2cap_chan_hold(chan) here again.
+ */
l2cap_chan_lock(chan);
if (chan->state == BT_CONNECTED || chan->state == BT_CONFIG)
@@ -426,12 +429,12 @@ static void l2cap_chan_timeout(struct work_struct *work)
l2cap_chan_close(chan, reason);
- l2cap_chan_unlock(chan);
-
chan->ops->close(chan);
- mutex_unlock(&conn->chan_lock);
+ l2cap_chan_unlock(chan);
l2cap_chan_put(chan);
+
+ mutex_unlock(&conn->chan_lock);
}
struct l2cap_chan *l2cap_chan_create(void)
@@ -1725,9 +1728,9 @@ static void l2cap_conn_del(struct hci_conn *hcon, int err)
l2cap_chan_del(chan, err);
- l2cap_chan_unlock(chan);
-
chan->ops->close(chan);
+
+ l2cap_chan_unlock(chan);
l2cap_chan_put(chan);
}
@@ -4327,6 +4330,7 @@ static inline int l2cap_disconnect_req(struct l2cap_conn *conn,
return 0;
}
+ l2cap_chan_hold(chan);
l2cap_chan_lock(chan);
rsp.dcid = cpu_to_le16(chan->scid);
@@ -4335,12 +4339,11 @@ static inline int l2cap_disconnect_req(struct l2cap_conn *conn,
chan->ops->set_shutdown(chan);
- l2cap_chan_hold(chan);
l2cap_chan_del(chan, ECONNRESET);
- l2cap_chan_unlock(chan);
-
chan->ops->close(chan);
+
+ l2cap_chan_unlock(chan);
l2cap_chan_put(chan);
mutex_unlock(&conn->chan_lock);
@@ -4372,20 +4375,21 @@ static inline int l2cap_disconnect_rsp(struct l2cap_conn *conn,
return 0;
}
+ l2cap_chan_hold(chan);
l2cap_chan_lock(chan);
if (chan->state != BT_DISCONN) {
l2cap_chan_unlock(chan);
+ l2cap_chan_put(chan);
mutex_unlock(&conn->chan_lock);
return 0;
}
- l2cap_chan_hold(chan);
l2cap_chan_del(chan, 0);
- l2cap_chan_unlock(chan);
-
chan->ops->close(chan);
+
+ l2cap_chan_unlock(chan);
l2cap_chan_put(chan);
mutex_unlock(&conn->chan_lock);
diff --git a/net/bluetooth/l2cap_sock.c b/net/bluetooth/l2cap_sock.c
index a8ba752732c98..3db8cfebd069a 100644
--- a/net/bluetooth/l2cap_sock.c
+++ b/net/bluetooth/l2cap_sock.c
@@ -1038,7 +1038,7 @@ done:
}
/* Kill socket (only if zapped and orphan)
- * Must be called on unlocked socket.
+ * Must be called on unlocked socket, with l2cap channel lock.
*/
static void l2cap_sock_kill(struct sock *sk)
{
@@ -1199,8 +1199,15 @@ static int l2cap_sock_release(struct socket *sock)
err = l2cap_sock_shutdown(sock, 2);
+ l2cap_chan_hold(l2cap_pi(sk)->chan);
+ l2cap_chan_lock(l2cap_pi(sk)->chan);
+
sock_orphan(sk);
l2cap_sock_kill(sk);
+
+ l2cap_chan_unlock(l2cap_pi(sk)->chan);
+ l2cap_chan_put(l2cap_pi(sk)->chan);
+
return err;
}
@@ -1218,12 +1225,15 @@ static void l2cap_sock_cleanup_listen(struct sock *parent)
BT_DBG("child chan %p state %s", chan,
state_to_string(chan->state));
+ l2cap_chan_hold(chan);
l2cap_chan_lock(chan);
+
__clear_chan_timer(chan);
l2cap_chan_close(chan, ECONNRESET);
- l2cap_chan_unlock(chan);
-
l2cap_sock_kill(sk);
+
+ l2cap_chan_unlock(chan);
+ l2cap_chan_put(chan);
}
}
--
2.25.1
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