[STABLE v6.1-v5.10 1/2] Bluetooth: L2CAP: access chan->conn safely in get/setsockopt

[STABLE v6.1-v5.10 1/2] Bluetooth: L2CAP: access chan->conn safely in get/setsockopt

[Lee Jones]

From: Pauli Virtanen <pav@iki.fi>

[ Upstream commit ca2c4c26498643f421d35ffe258fafbd3ed461c3 ]

Since commit b66774b48dd9 ("Bluetooth: L2CAP: Fix UAF in channel timeout by holding conn ref")
l2cap_chan::conn has held reference and remains non-NULL also after the
corresponding hci_conn is deleted.  In this state accessing various
fields eg. hci_conn::hdev is invalid, which leads to KASAN crash in
l2cap_sock_setsockopt() access of conn->hcon->hdev.

Check l2cap_chan::conn.hcon corresponds to an alive hci_conn before
trying to use it in l2cap_sock.c.  Hold l2cap_chan_lock() in
getsockopt/setsockopt to ensure it stays alive, and to avoid data races
in l2cap_chan fields.

Fixes: b66774b48dd9 ("Bluetooth: L2CAP: Fix UAF in channel timeout by holding conn ref")
Reported-by: syzbot+b106284c2a0b7bc80cf9@syzkaller.appspotmail.com
Link: https://syzkaller.appspot.com/bug?extid=b106284c2a0b7bc80cf9
Signed-off-by: Pauli Virtanen <pav@iki.fi>
Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>
[Lee: Omit sockopt_t conversion from commit bf01627cc04b ("Bluetooth: L2CAP: convert to getsockopt_iter")]
Signed-off-by: Lee Jones <lee@kernel.org>
---
 net/bluetooth/l2cap_sock.c | 57 ++++++++++++++++++++++++++++++--------
 1 file changed, 46 insertions(+), 11 deletions(-)

diff --git a/net/bluetooth/l2cap_sock.c b/net/bluetooth/l2cap_sock.c
index 9b8bddefeb84..b11558b0dfec 100644
--- a/net/bluetooth/l2cap_sock.c
+++ b/net/bluetooth/l2cap_sock.c
@@ -437,11 +437,26 @@ static int l2cap_get_mode(struct l2cap_chan *chan)
 	return -EINVAL;
 }
 
+static struct l2cap_conn *l2cap_chan_conn(struct l2cap_chan *chan)
+{
+	lockdep_assert_held(&chan->lock);
+
+	/* l2cap_conn_del() sets FLAG_DEL while holding chan->lock before
+	 * conn->hcon is deleted. If not set and conn is non-NULL, conn->hcon
+	 * remains alive during this chan->lock critical section.
+	 */
+	if (test_bit(FLAG_DEL, &chan->flags))
+		return NULL;
+
+	return chan->conn;
+}
+
 static int l2cap_sock_getsockopt_old(struct socket *sock, int optname,
 				     char __user *optval, int __user *optlen)
 {
 	struct sock *sk = sock->sk;
 	struct l2cap_chan *chan = l2cap_pi(sk)->chan;
+	struct l2cap_conn *conn;
 	struct l2cap_options opts;
 	struct l2cap_conninfo cinfo;
 	int err = 0;
@@ -453,6 +468,7 @@ static int l2cap_sock_getsockopt_old(struct socket *sock, int optname,
 	if (get_user(len, optlen))
 		return -EFAULT;
 
+	l2cap_chan_lock(chan);
 	lock_sock(sk);
 
 	switch (optname) {
@@ -538,9 +554,15 @@ static int l2cap_sock_getsockopt_old(struct socket *sock, int optname,
 			break;
 		}
 
+		conn = l2cap_chan_conn(chan);
+		if (!conn) {
+			err = -ENOTCONN;
+			break;
+		}
+
 		memset(&cinfo, 0, sizeof(cinfo));
-		cinfo.hci_handle = chan->conn->hcon->handle;
-		memcpy(cinfo.dev_class, chan->conn->hcon->dev_class, 3);
+		cinfo.hci_handle = conn->hcon->handle;
+		memcpy(cinfo.dev_class, conn->hcon->dev_class, 3);
 
 		len = min(len, sizeof(cinfo));
 		if (copy_to_user(optval, (char *) &cinfo, len))
@@ -554,6 +576,8 @@ static int l2cap_sock_getsockopt_old(struct socket *sock, int optname,
 	}
 
 	release_sock(sk);
+	l2cap_chan_unlock(chan);
+
 	return err;
 }
 
@@ -562,6 +586,7 @@ static int l2cap_sock_getsockopt(struct socket *sock, int level, int optname,
 {
 	struct sock *sk = sock->sk;
 	struct l2cap_chan *chan = l2cap_pi(sk)->chan;
+	struct l2cap_conn *conn;
 	struct bt_security sec;
 	struct bt_power pwr;
 	u32 phys;
@@ -578,6 +603,7 @@ static int l2cap_sock_getsockopt(struct socket *sock, int level, int optname,
 	if (get_user(len, optlen))
 		return -EFAULT;
 
+	l2cap_chan_lock(chan);
 	lock_sock(sk);
 
 	switch (optname) {
@@ -589,12 +615,14 @@ static int l2cap_sock_getsockopt(struct socket *sock, int level, int optname,
 			break;
 		}
 
+		conn = l2cap_chan_conn(chan);
+
 		memset(&sec, 0, sizeof(sec));
-		if (chan->conn) {
-			sec.level = chan->conn->hcon->sec_level;
+		if (conn) {
+			sec.level = conn->hcon->sec_level;
 
 			if (sk->sk_state == BT_CONNECTED)
-				sec.key_size = chan->conn->hcon->enc_key_size;
+				sec.key_size = conn->hcon->enc_key_size;
 		} else {
 			sec.level = chan->sec_level;
 		}
@@ -670,12 +698,14 @@ static int l2cap_sock_getsockopt(struct socket *sock, int level, int optname,
 		break;
 
 	case BT_PHY:
-		if (sk->sk_state != BT_CONNECTED) {
+		conn = l2cap_chan_conn(chan);
+
+		if (sk->sk_state != BT_CONNECTED || !conn) {
 			err = -ENOTCONN;
 			break;
 		}
 
-		phys = hci_conn_get_phy(chan->conn->hcon);
+		phys = hci_conn_get_phy(conn->hcon);
 
 		if (put_user(phys, (u32 __user *) optval))
 			err = -EFAULT;
@@ -708,6 +738,7 @@ static int l2cap_sock_getsockopt(struct socket *sock, int level, int optname,
 	}
 
 	release_sock(sk);
+	l2cap_chan_unlock(chan);
 	return err;
 }
 
@@ -738,6 +769,7 @@ static int l2cap_sock_setsockopt_old(struct socket *sock, int optname,
 
 	BT_DBG("sk %p", sk);
 
+	l2cap_chan_lock(chan);
 	lock_sock(sk);
 
 	switch (optname) {
@@ -838,6 +870,7 @@ static int l2cap_sock_setsockopt_old(struct socket *sock, int optname,
 	}
 
 	release_sock(sk);
+	l2cap_chan_unlock(chan);
 	return err;
 }
 
@@ -901,6 +934,7 @@ static int l2cap_sock_setsockopt(struct socket *sock, int level, int optname,
 	if (level != SOL_BLUETOOTH)
 		return -ENOPROTOOPT;
 
+	l2cap_chan_lock(chan);
 	lock_sock(sk);
 
 	switch (optname) {
@@ -926,11 +960,10 @@ static int l2cap_sock_setsockopt(struct socket *sock, int level, int optname,
 
 		chan->sec_level = sec.level;
 
-		if (!chan->conn)
+		conn = l2cap_chan_conn(chan);
+		if (!conn)
 			break;
 
-		conn = chan->conn;
-
 		/* change security for LE channels */
 		if (chan->scid == L2CAP_CID_ATT) {
 			if (smp_conn_security(conn->hcon, sec.level)) {
@@ -985,7 +1018,8 @@ static int l2cap_sock_setsockopt(struct socket *sock, int level, int optname,
 		}
 
 		if (opt == BT_FLUSHABLE_OFF) {
-			conn = chan->conn;
+			conn = l2cap_chan_conn(chan);
+
 			/* proceed further only when we have l2cap_conn and
 			   No Flush support in the LM */
 			if (!conn || !lmp_no_flush_capable(conn->hcon->hdev)) {
@@ -1108,6 +1142,7 @@ static int l2cap_sock_setsockopt(struct socket *sock, int level, int optname,
 	}
 
 	release_sock(sk);
+	l2cap_chan_unlock(chan);
 	return err;
 }
 
-- 
2.56.0.307.g5fe7bd680c-goog

[STABLE v6.1-v5.10 2/2] Bluetooth: L2CAP: refuse __l2cap_chan_add if chan already has conn

[Lee Jones]

From: Pauli Virtanen <pav@iki.fi>

[ Upstream commit 86b55991d3cd690e73c5ef8d20b75ae4905b357a ]

l2cap_chan may be linked to l2cap_conn at most once. This is assumed in
several places, eg l2cap_chan_del cleanup.

There is a TOCTOU race where the invariant is violated:

    [Task 1]                          [Task 2]
    l2cap_chan_connect                l2cap_sock_bind
      l2cap_chan_lock                   lock_sock
      l2cap_state_change                if (sk->sk_state != BT_OPEN)
        chan->state = BT_CONNECT
        l2cap_sock_state_change_cb      chan->state = BT_BOUND
                                        sk->sk_state = BT_BOUND
          lock_sock <------------------ release_sock
          sk->sk_state = BT_CONNECT

l2cap_sock_connect() does not check sk->sk_state, so since chan->state
is now BT_BOUND, subsequent connect() ends up with second
__l2cap_chan_add.

Explicitly document and check the invariant in __l2cap_chan_add with
WARN_ON_ONCE. The only callsite where it could be hit is
l2cap_chan_connect, so add pre-check there to avoid relying on
chan->state. chan->state read/write is not properly guarded currently so
there can be other TOCTOUC problems.

Add l2cap_lock_chan in l2cap_sock_bind() to guard chan->state write.

Fixes: b66774b48dd9 ("Bluetooth: L2CAP: Fix UAF in channel timeout by holding conn ref")
Assisted-by: deepseek-4-flash # finding the race condition
Signed-off-by: Pauli Virtanen <pav@iki.fi>
Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>
[Lee: Resolve context conflict around mutex_lock(&conn->chan_lock) prior to commit 56c2b5831d39 ("Bluetooth: L2CAP: fix out-of-bounds write in l2cap_ecred_connect")]
Signed-off-by: Lee Jones <lee@kernel.org>
---
 net/bluetooth/l2cap_core.c | 7 ++++++-
 net/bluetooth/l2cap_sock.c | 2 ++
 2 files changed, 8 insertions(+), 1 deletion(-)

diff --git a/net/bluetooth/l2cap_core.c b/net/bluetooth/l2cap_core.c
index 88ddd8eabae9..445a43c721f6 100644
--- a/net/bluetooth/l2cap_core.c
+++ b/net/bluetooth/l2cap_core.c
@@ -630,6 +630,10 @@ void __l2cap_chan_add(struct l2cap_conn *conn, struct l2cap_chan *chan)
 	BT_DBG("conn %p, psm 0x%2.2x, dcid 0x%4.4x", conn,
 	       __le16_to_cpu(chan->psm), chan->dcid);
 
+	/* Caller must ensure l2cap_chan is linked to l2cap_conn only once */
+	if (WARN_ON_ONCE(chan->conn || test_bit(FLAG_DEL, &chan->flags)))
+		return;
+
 	conn->disc_reason = HCI_ERROR_REMOTE_USER_TERM;
 
 	chan->conn = l2cap_conn_get(conn);
@@ -7431,7 +7435,8 @@ int l2cap_chan_connect(struct l2cap_chan *chan, __le16 psm, u16 cid,
 	mutex_lock(&conn->chan_lock);
 	l2cap_chan_lock(chan);
 
-	if (cid && __l2cap_get_chan_by_dcid(conn, cid)) {
+	if ((cid && __l2cap_get_chan_by_dcid(conn, cid)) || chan->conn ||
+	    test_bit(FLAG_DEL, &chan->flags)) {
 		hci_conn_drop(hcon);
 		err = -EBUSY;
 		goto chan_unlock;
diff --git a/net/bluetooth/l2cap_sock.c b/net/bluetooth/l2cap_sock.c
index b11558b0dfec..655922aa82f1 100644
--- a/net/bluetooth/l2cap_sock.c
+++ b/net/bluetooth/l2cap_sock.c
@@ -111,6 +111,7 @@ static int l2cap_sock_bind(struct socket *sock, struct sockaddr *addr, int alen)
 			return -EINVAL;
 	}
 
+	l2cap_chan_lock(chan);
 	lock_sock(sk);
 
 	if (sk->sk_state != BT_OPEN) {
@@ -176,6 +177,7 @@ static int l2cap_sock_bind(struct socket *sock, struct sockaddr *addr, int alen)
 
 done:
 	release_sock(sk);
+	l2cap_chan_unlock(chan);
 	return err;
 }
 
-- 
2.56.0.307.g5fe7bd680c-goog