From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-12.8 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH, MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED, USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 505ACC433E3 for ; Mon, 17 Aug 2020 19:29:01 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 2A8F2204EC for ; Mon, 17 Aug 2020 19:29:01 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1597692541; bh=eekNIuZ6/aK9xcI4E2AMDCl3Y/zTwLLCRt5O9x2Jkzw=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=H4d12Rfviw2bOnWxcK3JspM/XlGEv0/Yi5oDuLT0KfTJndg/e/WG+v7wg16te3GAl 5Idrbg3mqWCiguxEpZJtKe7sCUDmQDKgkoux8oIRMv6r7i3KGZvrlBi8eYcYZzjtp7 HyCdR6BeTohnaQjxxoq31mb37UFrjK95PVsBtK/I= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730317AbgHQT2u (ORCPT ); Mon, 17 Aug 2020 15:28:50 -0400 Received: from mail.kernel.org ([198.145.29.99]:60720 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730319AbgHQPcj (ORCPT ); Mon, 17 Aug 2020 11:32:39 -0400 Received: from localhost (83-86-89-107.cable.dynamic.v4.ziggo.nl [83.86.89.107]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 3BEA123441; Mon, 17 Aug 2020 15:32:36 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1597678356; bh=eekNIuZ6/aK9xcI4E2AMDCl3Y/zTwLLCRt5O9x2Jkzw=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=MwwjEBjUokQ4q/x76hkV86W5cwGp5vxItd1nYFe4oR/nz9Pp35ibKC/0EiftfPk0M GFE5u6oNLdW143VqwlH/5Mo4D0YoKDjp42/UQ22Tj6qhz0PwUvG/Cx/yuTluiot1CX m4EB3+aex90OB1ZiVmftJJUKYl/iBfQyjAQ34MkA= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, =?UTF-8?q?Micha=C5=82=20Wi=C5=9Bniewski?= , Mike Johnson , Ricardo Rodrigues , "M.Hanny Sabbagh" , Oussama BEN BRAHIM , Ismael Ferreras Morezuelas , Marcel Holtmann , Sasha Levin Subject: [PATCH 5.8 305/464] Bluetooth: btusb: Fix and detect most of the Chinese Bluetooth controllers Date: Mon, 17 Aug 2020 17:14:18 +0200 Message-Id: <20200817143848.414965727@linuxfoundation.org> X-Mailer: git-send-email 2.28.0 In-Reply-To: <20200817143833.737102804@linuxfoundation.org> References: <20200817143833.737102804@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Ismael Ferreras Morezuelas [ Upstream commit cde1a8a992875a7479c4321b2a4a190c2e92ec2a ] For some reason they tend to squat on the very first CSR/ Cambridge Silicon Radio VID/PID instead of paying fees. This is an extremely common problem; the issue goes as back as 2013 and these devices are only getting more popular, even rebranded by reputable vendors and sold by retailers everywhere. So, at this point in time there are hundreds of modern dongles reusing the ID of what originally was an early Bluetooth 1.1 controller. Linux is the only place where they don't work due to spotty checks in our detection code. It only covered a minimum subset. So what's the big idea? Take advantage of the fact that all CSR chips report the same internal version as both the LMP sub-version and HCI revision number. It always matches, couple that with the manufacturer code, that rarely lies, and we now have a good idea of who is who. Additionally, by compiling a list of user-reported HCI/lsusb dumps, and searching around for legit CSR dongles in similar product ranges we can find what CSR BlueCore firmware supported which Bluetooth versions. That way we can narrow down ranges of fakes for each of them. e.g. Real CSR dongles with LMP subversion 0x73 are old enough that support BT 1.1 only; so it's a dead giveaway when some third-party BT 4.0 dongle reuses it. So, to sum things up; there are multiple classes of fake controllers reusing the same 0A12:0001 VID/PID. This has been broken for a while. Known 'fake' bcdDevices: 0x0100, 0x0134, 0x1915, 0x2520, 0x7558, 0x8891 IC markings on 0x7558: FR3191AHAL 749H15143 (???) https://bugzilla.kernel.org/show_bug.cgi?id=60824 Fixes: 81cac64ba258ae (Deal with USB devices that are faking CSR vendor) Reported-by: Michał Wiśniewski Tested-by: Mike Johnson Tested-by: Ricardo Rodrigues Tested-by: M.Hanny Sabbagh Tested-by: Oussama BEN BRAHIM Tested-by: Ismael Ferreras Morezuelas Signed-off-by: Ismael Ferreras Morezuelas Signed-off-by: Marcel Holtmann Signed-off-by: Sasha Levin --- drivers/bluetooth/btusb.c | 74 ++++++++++++++++++++++++++----- include/net/bluetooth/bluetooth.h | 2 + include/net/bluetooth/hci.h | 11 +++++ net/bluetooth/hci_core.c | 6 ++- 4 files changed, 81 insertions(+), 12 deletions(-) diff --git a/drivers/bluetooth/btusb.c b/drivers/bluetooth/btusb.c index 61ffe185e0e49..a5fef9aa419fd 100644 --- a/drivers/bluetooth/btusb.c +++ b/drivers/bluetooth/btusb.c @@ -1720,6 +1720,7 @@ static int btusb_setup_csr(struct hci_dev *hdev) { struct hci_rp_read_local_version *rp; struct sk_buff *skb; + bool is_fake = false; BT_DBG("%s", hdev->name); @@ -1739,18 +1740,69 @@ static int btusb_setup_csr(struct hci_dev *hdev) rp = (struct hci_rp_read_local_version *)skb->data; - /* Detect controllers which aren't real CSR ones. */ + /* Detect a wide host of Chinese controllers that aren't CSR. + * + * Known fake bcdDevices: 0x0100, 0x0134, 0x1915, 0x2520, 0x7558, 0x8891 + * + * The main thing they have in common is that these are really popular low-cost + * options that support newer Bluetooth versions but rely on heavy VID/PID + * squatting of this poor old Bluetooth 1.1 device. Even sold as such. + * + * We detect actual CSR devices by checking that the HCI manufacturer code + * is Cambridge Silicon Radio (10) and ensuring that LMP sub-version and + * HCI rev values always match. As they both store the firmware number. + */ if (le16_to_cpu(rp->manufacturer) != 10 || - le16_to_cpu(rp->lmp_subver) == 0x0c5c) { + le16_to_cpu(rp->hci_rev) != le16_to_cpu(rp->lmp_subver)) + is_fake = true; + + /* Known legit CSR firmware build numbers and their supported BT versions: + * - 1.1 (0x1) -> 0x0073, 0x020d, 0x033c, 0x034e + * - 1.2 (0x2) -> 0x04d9, 0x0529 + * - 2.0 (0x3) -> 0x07a6, 0x07ad, 0x0c5c + * - 2.1 (0x4) -> 0x149c, 0x1735, 0x1899 (0x1899 is a BlueCore4-External) + * - 4.0 (0x6) -> 0x1d86, 0x2031, 0x22bb + * + * e.g. Real CSR dongles with LMP subversion 0x73 are old enough that + * support BT 1.1 only; so it's a dead giveaway when some + * third-party BT 4.0 dongle reuses it. + */ + else if (le16_to_cpu(rp->lmp_subver) <= 0x034e && + le16_to_cpu(rp->hci_ver) > BLUETOOTH_VER_1_1) + is_fake = true; + + else if (le16_to_cpu(rp->lmp_subver) <= 0x0529 && + le16_to_cpu(rp->hci_ver) > BLUETOOTH_VER_1_2) + is_fake = true; + + else if (le16_to_cpu(rp->lmp_subver) <= 0x0c5c && + le16_to_cpu(rp->hci_ver) > BLUETOOTH_VER_2_0) + is_fake = true; + + else if (le16_to_cpu(rp->lmp_subver) <= 0x1899 && + le16_to_cpu(rp->hci_ver) > BLUETOOTH_VER_2_1) + is_fake = true; + + else if (le16_to_cpu(rp->lmp_subver) <= 0x22bb && + le16_to_cpu(rp->hci_ver) > BLUETOOTH_VER_4_0) + is_fake = true; + + if (is_fake) { + bt_dev_warn(hdev, "CSR: Unbranded CSR clone detected; adding workarounds..."); + + /* Generally these clones have big discrepancies between + * advertised features and what's actually supported. + * Probably will need to be expanded in the future; + * without these the controller will lock up. + */ + set_bit(HCI_QUIRK_BROKEN_STORED_LINK_KEY, &hdev->quirks); + set_bit(HCI_QUIRK_BROKEN_ERR_DATA_REPORTING, &hdev->quirks); + /* Clear the reset quirk since this is not an actual * early Bluetooth 1.1 device from CSR. */ clear_bit(HCI_QUIRK_RESET_ON_CLOSE, &hdev->quirks); - - /* These fake CSR controllers have all a broken - * stored link key handling and so just disable it. - */ - set_bit(HCI_QUIRK_BROKEN_STORED_LINK_KEY, &hdev->quirks); + clear_bit(HCI_QUIRK_SIMULTANEOUS_DISCOVERY, &hdev->quirks); } kfree_skb(skb); @@ -4015,11 +4067,13 @@ static int btusb_probe(struct usb_interface *intf, if (bcdDevice < 0x117) set_bit(HCI_QUIRK_RESET_ON_CLOSE, &hdev->quirks); + /* This must be set first in case we disable it for fakes */ + set_bit(HCI_QUIRK_SIMULTANEOUS_DISCOVERY, &hdev->quirks); + /* Fake CSR devices with broken commands */ - if (bcdDevice <= 0x100 || bcdDevice == 0x134) + if (le16_to_cpu(udev->descriptor.idVendor) == 0x0a12 && + le16_to_cpu(udev->descriptor.idProduct) == 0x0001) hdev->setup = btusb_setup_csr; - - set_bit(HCI_QUIRK_SIMULTANEOUS_DISCOVERY, &hdev->quirks); } if (id->driver_info & BTUSB_SNIFFER) { diff --git a/include/net/bluetooth/bluetooth.h b/include/net/bluetooth/bluetooth.h index 18190055374c9..155019220c47b 100644 --- a/include/net/bluetooth/bluetooth.h +++ b/include/net/bluetooth/bluetooth.h @@ -41,6 +41,8 @@ #define BLUETOOTH_VER_1_1 1 #define BLUETOOTH_VER_1_2 2 #define BLUETOOTH_VER_2_0 3 +#define BLUETOOTH_VER_2_1 4 +#define BLUETOOTH_VER_4_0 6 /* Reserv for core and drivers use */ #define BT_SKB_RESERVE 8 diff --git a/include/net/bluetooth/hci.h b/include/net/bluetooth/hci.h index 16ab6ce878834..1c321b6d1ed85 100644 --- a/include/net/bluetooth/hci.h +++ b/include/net/bluetooth/hci.h @@ -227,6 +227,17 @@ enum { * supported. */ HCI_QUIRK_VALID_LE_STATES, + + /* When this quirk is set, then erroneous data reporting + * is ignored. This is mainly due to the fact that the HCI + * Read Default Erroneous Data Reporting command is advertised, + * but not supported; these controllers often reply with unknown + * command and tend to lock up randomly. Needing a hard reset. + * + * This quirk can be set before hci_register_dev is called or + * during the hdev->setup vendor callback. + */ + HCI_QUIRK_BROKEN_ERR_DATA_REPORTING, }; /* HCI device flags */ diff --git a/net/bluetooth/hci_core.c b/net/bluetooth/hci_core.c index 83ce665d3cbfb..2a0968be22bff 100644 --- a/net/bluetooth/hci_core.c +++ b/net/bluetooth/hci_core.c @@ -606,7 +606,8 @@ static int hci_init3_req(struct hci_request *req, unsigned long opt) if (hdev->commands[8] & 0x01) hci_req_add(req, HCI_OP_READ_PAGE_SCAN_ACTIVITY, 0, NULL); - if (hdev->commands[18] & 0x04) + if (hdev->commands[18] & 0x04 && + !test_bit(HCI_QUIRK_BROKEN_ERR_DATA_REPORTING, &hdev->quirks)) hci_req_add(req, HCI_OP_READ_DEF_ERR_DATA_REPORTING, 0, NULL); /* Some older Broadcom based Bluetooth 1.2 controllers do not @@ -851,7 +852,8 @@ static int hci_init4_req(struct hci_request *req, unsigned long opt) /* Set erroneous data reporting if supported to the wideband speech * setting value */ - if (hdev->commands[18] & 0x08) { + if (hdev->commands[18] & 0x08 && + !test_bit(HCI_QUIRK_BROKEN_ERR_DATA_REPORTING, &hdev->quirks)) { bool enabled = hci_dev_test_flag(hdev, HCI_WIDEBAND_SPEECH_ENABLED); -- 2.25.1