[PATCH] Bluetooth: Add new quirk for broken read key length on ATS2851

[PATCH] Bluetooth: Add new quirk for broken read key length on ATS2851

[Vinicius Peixoto]

The ATS2851 controller erroneously reports support for the "Read
Encryption Key Length" HCI command. This makes it unable to connect
to any devices, since this command is issued by the kernel during the
connection process in response to an "Encryption Change" HCI event.

Add a new quirk (HCI_QUIRK_BROKEN_ENC_KEY_SIZE) to hint that the command
is unsupported, preventing it from interrupting the connection process.

This is the error log from btmon before this patch:

> HCI Event: Encryption Change (0x08) plen 4
        Status: Success (0x00)
        Handle: 2048 Address: ...
        Encryption: Enabled with E0 (0x01)
< HCI Command: Read Encryption Key Size (0x05|0x0008) plen 2
        Handle: 2048 Address: ...
> HCI Event: Command Status (0x0f) plen 4
      Read Encryption Key Size (0x05|0x0008) ncmd 1
        Status: Unknown HCI Command (0x01)

Signed-off-by: Vinicius Peixoto <nukelet64@gmail.com>
---
 drivers/bluetooth/btusb.c   | 1 +
 include/net/bluetooth/hci.h | 8 ++++++++
 net/bluetooth/hci_event.c   | 3 ++-
 3 files changed, 11 insertions(+), 1 deletion(-)

diff --git a/drivers/bluetooth/btusb.c b/drivers/bluetooth/btusb.c
index edfb49bbaa28..96c9318c0874 100644
--- a/drivers/bluetooth/btusb.c
+++ b/drivers/bluetooth/btusb.c
@@ -4489,6 +4489,7 @@ static int btusb_probe(struct usb_interface *intf,
 		set_bit(HCI_QUIRK_BROKEN_READ_TRANSMIT_POWER, &hdev->quirks);
 		set_bit(HCI_QUIRK_BROKEN_SET_RPA_TIMEOUT, &hdev->quirks);
 		set_bit(HCI_QUIRK_BROKEN_EXT_SCAN, &hdev->quirks);
+		set_bit(HCI_QUIRK_BROKEN_READ_ENC_KEY_SIZE, &hdev->quirks);
 	}
 
 	if (!reset)
diff --git a/include/net/bluetooth/hci.h b/include/net/bluetooth/hci.h
index 08cb5cb249a4..33b5da0830e2 100644
--- a/include/net/bluetooth/hci.h
+++ b/include/net/bluetooth/hci.h
@@ -330,6 +330,14 @@ enum {
 	 * during the hdev->setup vendor callback.
 	 */
 	HCI_QUIRK_BROKEN_LE_CODED,
+
+	/*
+	 * When this quirk is set, the HCI_OP_READ_ENC_KEY_SIZE command is
+	 * skipped during an HCI_EV_ENCRYPT_CHANGE event. This is required
+	 * for Actions Semiconductor ATS2851 based controllers, which erroneously
+	 * claim to support it.
+	 */
+	HCI_QUIRK_BROKEN_READ_ENC_KEY_SIZE,
 };
 
 /* HCI device flags */
diff --git a/net/bluetooth/hci_event.c b/net/bluetooth/hci_event.c
index bffd2c7ff608..4ae224824012 100644
--- a/net/bluetooth/hci_event.c
+++ b/net/bluetooth/hci_event.c
@@ -3641,7 +3641,8 @@ static void hci_encrypt_change_evt(struct hci_dev *hdev, void *data,
 		 * controller really supports it. If it doesn't, assume
 		 * the default size (16).
 		 */
-		if (!(hdev->commands[20] & 0x10)) {
+		if (!(hdev->commands[20] & 0x10) ||
+		    test_bit(HCI_QUIRK_BROKEN_READ_ENC_KEY_SIZE, &hdev->quirks)) {
 			conn->enc_key_size = HCI_LINK_KEY_SIZE;
 			goto notify;
 		}
-- 
2.43.0

RE: Bluetooth: Add new quirk for broken read key length on ATS2851

[bluez.test.bot]

[-- Attachment #1: Type: text/plain, Size: 2359 bytes --]

This is automated email and please do not reply to this email!

Dear submitter,

Thank you for submitting the patches to the linux bluetooth mailing list.
This is a CI test results with your patch series:
PW Link:https://patchwork.kernel.org/project/bluetooth/list/?series=830105

---Test result---

Test Summary:
CheckPatch                    PASS      0.99 seconds
GitLint                       PASS      0.28 seconds
SubjectPrefix                 PASS      0.10 seconds
BuildKernel                   PASS      30.69 seconds
CheckAllWarning               PASS      33.84 seconds
CheckSparse                   WARNING   39.30 seconds
CheckSmatch                   WARNING   105.60 seconds
BuildKernel32                 PASS      29.51 seconds
TestRunnerSetup               PASS      541.18 seconds
TestRunner_l2cap-tester       FAIL      25.55 seconds
TestRunner_iso-tester         FAIL      43.79 seconds
TestRunner_bnep-tester        PASS      4.90 seconds
TestRunner_mgmt-tester        PASS      119.65 seconds
TestRunner_rfcomm-tester      PASS      7.56 seconds
TestRunner_sco-tester         PASS      15.13 seconds
TestRunner_ioctl-tester       PASS      8.38 seconds
TestRunner_mesh-tester        PASS      6.24 seconds
TestRunner_smp-tester         PASS      7.24 seconds
TestRunner_userchan-tester    PASS      5.27 seconds
IncrementalBuild              PASS      29.23 seconds

Details
##############################
Test: CheckSparse - WARNING
Desc: Run sparse tool with linux kernel
Output:
net/bluetooth/hci_event.c: note: in included file (through include/net/bluetooth/hci_core.h):
##############################
Test: CheckSmatch - WARNING
Desc: Run smatch tool with source
Output:
net/bluetooth/hci_event.c: note: in included file (through include/net/bluetooth/hci_core.h):
##############################
Test: TestRunner_l2cap-tester - FAIL
Desc: Run l2cap-tester with test-runner
Output:
Total: 51, Passed: 50 (98.0%), Failed: 1, Not Run: 0

Failed Test Cases
L2CAP LE Client - Close socket 2                     Timed out    2.554 seconds
##############################
Test: TestRunner_iso-tester - FAIL
Desc: Run iso-tester with test-runner
Output:
Total: 117, Passed: 116 (99.1%), Failed: 1, Not Run: 0

Failed Test Cases
ISO Connect2 Suspend - Success                       Timed out   12.278 seconds


---
Regards,
Linux Bluetooth

Re: [PATCH] Bluetooth: Add new quirk for broken read key length on ATS2851

[patchwork-bot+bluetooth]

Hello:

This patch was applied to bluetooth/bluetooth-next.git (master)
by Luiz Augusto von Dentz <luiz.von.dentz@intel.com>:

On Mon, 26 Feb 2024 22:43:26 -0300 you wrote:
> The ATS2851 controller erroneously reports support for the "Read
> Encryption Key Length" HCI command. This makes it unable to connect
> to any devices, since this command is issued by the kernel during the
> connection process in response to an "Encryption Change" HCI event.
> 
> Add a new quirk (HCI_QUIRK_BROKEN_ENC_KEY_SIZE) to hint that the command
> is unsupported, preventing it from interrupting the connection process.
> 
> [...]

Here is the summary with links:
  - Bluetooth: Add new quirk for broken read key length on ATS2851
    https://git.kernel.org/bluetooth/bluetooth-next/c/88f741deaa76

You are awesome, thank you!
-- 
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