kernel/git/stable/linux.git/net/bluetooth, branch linux-5.8.y

Bluetooth: Only mark socket zapped after unlocking

2020-10-29T09:08:25+00:00

[ Upstream commit 20ae4089d0afeb24e9ceb026b996bfa55c983cc2 ] Since l2cap_sock_teardown_cb doesn't acquire the channel lock before setting the socket as zapped, it could potentially race with l2cap_sock_release which frees the socket. Thus, wait until the cleanup is complete before marking the socket as zapped. This race was reproduced on a JBL GO speaker after the remote device rejected L2CAP connection due to resource unavailability. Here is a dmesg log with debug logs from a repro of this bug: [ 3465.424086] Bluetooth: hci_core.c:hci_acldata_packet() hci0 len 16 handle 0x0003 flags 0x0002 [ 3465.424090] Bluetooth: hci_conn.c:hci_conn_enter_active_mode() hcon 00000000cfedd07d mode 0 [ 3465.424094] Bluetooth: l2cap_core.c:l2cap_recv_acldata() conn 000000007eae8952 len 16 flags 0x2 [ 3465.424098] Bluetooth: l2cap_core.c:l2cap_recv_frame() len 12, cid 0x0001 [ 3465.424102] Bluetooth: l2cap_core.c:l2cap_raw_recv() conn 000000007eae8952 [ 3465.424175] Bluetooth: l2cap_core.c:l2cap_sig_channel() code 0x03 len 8 id 0x0c [ 3465.424180] Bluetooth: l2cap_core.c:l2cap_connect_create_rsp() dcid 0x0045 scid 0x0000 result 0x02 status 0x00 [ 3465.424189] Bluetooth: l2cap_core.c:l2cap_chan_put() chan 000000006acf9bff orig refcnt 4 [ 3465.424196] Bluetooth: l2cap_core.c:l2cap_chan_del() chan 000000006acf9bff, conn 000000007eae8952, err 111, state BT_CONNECT [ 3465.424203] Bluetooth: l2cap_sock.c:l2cap_sock_teardown_cb() chan 000000006acf9bff state BT_CONNECT [ 3465.424221] Bluetooth: l2cap_core.c:l2cap_chan_put() chan 000000006acf9bff orig refcnt 3 [ 3465.424226] Bluetooth: hci_core.h:hci_conn_drop() hcon 00000000cfedd07d orig refcnt 6 [ 3465.424234] BUG: spinlock bad magic on CPU#2, kworker/u17:0/159 [ 3465.425626] Bluetooth: hci_sock.c:hci_sock_sendmsg() sock 000000002bb0cb64 sk 00000000a7964053 [ 3465.430330] lock: 0xffffff804410aac0, .magic: 00000000, .owner: /-1, .owner_cpu: 0 [ 3465.430332] Causing a watchdog bite! Signed-off-by: Abhishek Pandit-Subedi Reported-by: Balakrishna Godavarthi Reviewed-by: Manish Mandlik Signed-off-by: Marcel Holtmann Signed-off-by: Sasha Levin

Bluetooth: Re-order clearing suspend tasks

2020-10-29T09:07:37+00:00

[ Upstream commit 3eec158d5eca7dd455118d9e00568aad2371219f ] Unregister_pm_notifier is a blocking call so suspend tasks should be cleared beforehand. Otherwise, the notifier will wait for completion before returning (and we encounter a 2s timeout on resume). Fixes: 0e9952804ec9c8 (Bluetooth: Clear suspend tasks on unregister) Signed-off-by: Abhishek Pandit-Subedi Signed-off-by: Marcel Holtmann Signed-off-by: Sasha Levin

Bluetooth: Clear suspend tasks on unregister

2020-10-29T09:07:33+00:00

[ Upstream commit 0e9952804ec9c8ba60f131225eab80634339f042 ] While unregistering, make sure to clear the suspend tasks before cancelling the work. If the unregister is called during resume from suspend, this will unnecessarily add 2s to the resume time otherwise. Fixes: 4e8c36c3b0d73d (Bluetooth: Fix suspend notifier race) Signed-off-by: Abhishek Pandit-Subedi Signed-off-by: Marcel Holtmann Signed-off-by: Sasha Levin

Bluetooth: Disconnect if E0 is used for Level 4

2020-10-17T06:56:29+00:00

commit 8746f135bb01872ff412d408ea1aa9ebd328c1f5 upstream. E0 is not allowed with Level 4: BLUETOOTH CORE SPECIFICATION Version 5.2 | Vol 3, Part C page 1319: '128-bit equivalent strength for link and encryption keys required using FIPS approved algorithms (E0 not allowed, SAFER+ not allowed, and P-192 not allowed; encryption key not shortened' SC enabled: > HCI Event: Read Remote Extended Features (0x23) plen 13 Status: Success (0x00) Handle: 256 Page: 1/2 Features: 0x0b 0x00 0x00 0x00 0x00 0x00 0x00 0x00 Secure Simple Pairing (Host Support) LE Supported (Host) Secure Connections (Host Support) > HCI Event: Encryption Change (0x08) plen 4 Status: Success (0x00) Handle: 256 Encryption: Enabled with AES-CCM (0x02) SC disabled: > HCI Event: Read Remote Extended Features (0x23) plen 13 Status: Success (0x00) Handle: 256 Page: 1/2 Features: 0x03 0x00 0x00 0x00 0x00 0x00 0x00 0x00 Secure Simple Pairing (Host Support) LE Supported (Host) > HCI Event: Encryption Change (0x08) plen 4 Status: Success (0x00) Handle: 256 Encryption: Enabled with E0 (0x01) [May 8 20:23] Bluetooth: hci0: Invalid security: expect AES but E0 was used < HCI Command: Disconnect (0x01|0x0006) plen 3 Handle: 256 Reason: Authentication Failure (0x05) Signed-off-by: Luiz Augusto von Dentz Signed-off-by: Marcel Holtmann Cc: Hans-Christian Noren Egtvedt Signed-off-by: Greg Kroah-Hartman

Bluetooth: MGMT: Fix not checking if BT_HS is enabled

2020-10-17T06:56:28+00:00

commit b560a208cda0297fef6ff85bbfd58a8f0a52a543 upstream. This checks if BT_HS is enabled relecting it on MGMT_SETTING_HS instead of always reporting it as supported. Signed-off-by: Luiz Augusto von Dentz Signed-off-by: Marcel Holtmann Signed-off-by: Greg Kroah-Hartman

Bluetooth: L2CAP: Fix calling sk_filter on non-socket based channel

2020-10-17T06:56:28+00:00

commit f19425641cb2572a33cb074d5e30283720bd4d22 upstream. Only sockets will have the chan->data set to an actual sk, channels like A2MP would have its own data which would likely cause a crash when calling sk_filter, in order to fix this a new callback has been introduced so channels can implement their own filtering if necessary. Signed-off-by: Luiz Augusto von Dentz Signed-off-by: Marcel Holtmann Signed-off-by: Greg Kroah-Hartman

Bluetooth: A2MP: Fix not initializing all members

2020-10-17T06:56:28+00:00

commit eddb7732119d53400f48a02536a84c509692faa8 upstream. This fixes various places where a stack variable is used uninitialized. Signed-off-by: Luiz Augusto von Dentz Signed-off-by: Marcel Holtmann Signed-off-by: Greg Kroah-Hartman

Bluetooth: Return NOTIFY_DONE for hci_suspend_notifier

2020-09-09T17:14:26+00:00

[ Upstream commit 24b065727ceba53cc5bec0e725672417154df24f ] The original return is NOTIFY_STOP, but notifier_call_chain would stop the future call for register_pm_notifier even registered on other Kernel modules with the same priority which value is zero. Signed-off-by: Max Chou Signed-off-by: Marcel Holtmann Signed-off-by: Sasha Levin

Bluetooth: Fix suspend notifier race

2020-08-19T06:26:47+00:00

[ Upstream commit 4e8c36c3b0d73d46aa27cfd4308aaa445a1067df ] Unregister from suspend notifications and cancel suspend preparations before running hci_dev_do_close. Otherwise, the suspend notifier may race with unregister and cause cmd_timeout even after hdev has been freed. Below is the trace from when this panic was seen: [ 832.578518] Bluetooth: hci_core.c:hci_cmd_timeout() hci0: command 0x0c05 tx timeout [ 832.586200] BUG: kernel NULL pointer dereference, address: 0000000000000000 [ 832.586203] #PF: supervisor read access in kernel mode [ 832.586205] #PF: error_code(0x0000) - not-present page [ 832.586206] PGD 0 P4D 0 [ 832.586210] PM: suspend exit [ 832.608870] Oops: 0000 [#1] PREEMPT SMP NOPTI [ 832.613232] CPU: 3 PID: 10755 Comm: kworker/3:7 Not tainted 5.4.44-04894-g1e9dbb96a161 #1 [ 832.630036] Workqueue: events hci_cmd_timeout [bluetooth] [ 832.630046] RIP: 0010:__queue_work+0xf0/0x374 [ 832.630051] RSP: 0018:ffff9b5285f1fdf8 EFLAGS: 00010046 [ 832.674033] RAX: ffff8a97681bac00 RBX: 0000000000000000 RCX: ffff8a976a000600 [ 832.681162] RDX: 0000000000000000 RSI: 0000000000000009 RDI: ffff8a976a000748 [ 832.688289] RBP: ffff9b5285f1fe38 R08: 0000000000000000 R09: ffff8a97681bac00 [ 832.695418] R10: 0000000000000002 R11: ffff8a976a0006d8 R12: ffff8a9745107600 [ 832.698045] usb 1-6: new full-speed USB device number 119 using xhci_hcd [ 832.702547] R13: ffff8a9673658850 R14: 0000000000000040 R15: 000000000000001e [ 832.702549] FS: 0000000000000000(0000) GS:ffff8a976af80000(0000) knlGS:0000000000000000 [ 832.702550] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 832.702550] CR2: 0000000000000000 CR3: 000000010415a000 CR4: 00000000003406e0 [ 832.702551] Call Trace: [ 832.702558] queue_work_on+0x3f/0x68 [ 832.702562] process_one_work+0x1db/0x396 [ 832.747397] worker_thread+0x216/0x375 [ 832.751147] kthread+0x138/0x140 [ 832.754377] ? pr_cont_work+0x58/0x58 [ 832.758037] ? kthread_blkcg+0x2e/0x2e [ 832.761787] ret_from_fork+0x22/0x40 [ 832.846191] ---[ end trace fa93f466da517212 ]--- Fixes: 9952d90ea2885 ("Bluetooth: Handle PM_SUSPEND_PREPARE and PM_POST_SUSPEND") Signed-off-by: Abhishek Pandit-Subedi Reviewed-by: Miao-chen Chou Signed-off-by: Marcel Holtmann Signed-off-by: Sasha Levin

Bluetooth: btusb: Fix and detect most of the Chinese Bluetooth controllers

2020-08-19T06:26:46+00:00

[ 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