* [PATCH AUTOSEL 4.14 08/18] Bluetooth: use correct lock to prevent UAF of hdev object
[not found] <20210607161517.3584577-1-sashal@kernel.org>
@ 2021-06-07 16:15 ` Sasha Levin
0 siblings, 0 replies; only message in thread
From: Sasha Levin @ 2021-06-07 16:15 UTC (permalink / raw)
To: linux-kernel, stable
Cc: Lin Ma, Marcel Holtmann, Sasha Levin, linux-bluetooth, netdev
From: Lin Ma <linma@zju.edu.cn>
[ Upstream commit e305509e678b3a4af2b3cfd410f409f7cdaabb52 ]
The hci_sock_dev_event() function will cleanup the hdev object for
sockets even if this object may still be in used within the
hci_sock_bound_ioctl() function, result in UAF vulnerability.
This patch replace the BH context lock to serialize these affairs
and prevent the race condition.
Signed-off-by: Lin Ma <linma@zju.edu.cn>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
net/bluetooth/hci_sock.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/net/bluetooth/hci_sock.c b/net/bluetooth/hci_sock.c
index 93093d7c3824..120064e9cb2b 100644
--- a/net/bluetooth/hci_sock.c
+++ b/net/bluetooth/hci_sock.c
@@ -750,7 +750,7 @@ void hci_sock_dev_event(struct hci_dev *hdev, int event)
/* Detach sockets from device */
read_lock(&hci_sk_list.lock);
sk_for_each(sk, &hci_sk_list.head) {
- bh_lock_sock_nested(sk);
+ lock_sock(sk);
if (hci_pi(sk)->hdev == hdev) {
hci_pi(sk)->hdev = NULL;
sk->sk_err = EPIPE;
@@ -759,7 +759,7 @@ void hci_sock_dev_event(struct hci_dev *hdev, int event)
hci_dev_put(hdev);
}
- bh_unlock_sock(sk);
+ release_sock(sk);
}
read_unlock(&hci_sk_list.lock);
}
--
2.30.2
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2021-06-07 16:15 ` [PATCH AUTOSEL 4.14 08/18] Bluetooth: use correct lock to prevent UAF of hdev object Sasha Levin
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