This is a note to let you know that I've just added the patch titled

Bluetooth: Fix missing encryption refresh on Security Request

to the 4.9-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git%3Ba=su...

The filename of the patch is: bluetooth-fix-missing-encryption-refresh-on-security-request.patch and it can be found in the queue-4.9 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let stable@vger.kernel.org know about it.

From 64e759f58f128730b97a3c3a26d283c075ad7c86 Mon Sep 17 00:00:00 2001

From: Szymon Janc szymon.janc@codecoup.pl Date: Mon, 26 Feb 2018 15:41:53 +0100 Subject: Bluetooth: Fix missing encryption refresh on Security Request

From: Szymon Janc szymon.janc@codecoup.pl

commit 64e759f58f128730b97a3c3a26d283c075ad7c86 upstream.

If Security Request is received on connection that is already encrypted with sufficient security master should perform encryption key refresh procedure instead of just ignoring Slave Security Request (Core Spec 5.0 Vol 3 Part H 2.4.6).

ACL Data RX: Handle 3585 flags 0x02 dlen 6

SMP: Security Request (0x0b) len 1 Authentication requirement: Bonding, No MITM, SC, No Keypresses (0x09) < HCI Command: LE Start Encryption (0x08|0x0019) plen 28 Handle: 3585 Random number: 0x0000000000000000 Encrypted diversifier: 0x0000 Long term key: 44264272a5c426a9e868f034cf0e69f3

HCI Event: Command Status (0x0f) plen 4

LE Start Encryption (0x08|0x0019) ncmd 1 Status: Success (0x00)

HCI Event: Encryption Key Refresh Complete (0x30) plen 3

Status: Success (0x00) Handle: 3585

Signed-off-by: Szymon Janc szymon.janc@codecoup.pl Signed-off-by: Marcel Holtmann marcel@holtmann.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org

--- net/bluetooth/smp.c | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-)

--- a/net/bluetooth/smp.c +++ b/net/bluetooth/smp.c @@ -2233,8 +2233,14 @@ static u8 smp_cmd_security_req(struct l2 else sec_level = authreq_to_seclevel(auth);

- if (smp_sufficient_security(hcon, sec_level, SMP_USE_LTK)) + if (smp_sufficient_security(hcon, sec_level, SMP_USE_LTK)) { + /* If link is already encrypted with sufficient security we + * still need refresh encryption as per Core Spec 5.0 Vol 3, + * Part H 2.4.6 + */ + smp_ltk_encrypt(conn, hcon->sec_level); return 0; + }

if (sec_level > hcon->pending_sec_level) hcon->pending_sec_level = sec_level;

Patches currently in stable-queue which might be from szymon.janc@codecoup.pl are

queue-4.9/bluetooth-fix-missing-encryption-refresh-on-security-request.patch