[v3,0/2] HID: use spinlocks to safely schedule led workers

Message

Pietro Borrello Feb. 9, 2023, 11:58 p.m. UTC

I noticed a recurring pattern is present in multiple hid devices in the
Linux tree, where the LED controller of a device schedules a work_struct
to interact with the hardware.
The work_struct is embedded in the device structure and thus, is freed
at device removal.

The issue is that a LED worker may be scheduled by a timer concurrently
with device removal, causing the work_struct to be accessed after having
been freed.
I was able to trigger the issue in hid-bigbenff.c and hid-asus.c 
where the work_structs may be scheduled by the LED controller
while the device is disconnecting, triggering use-after-frees.
I can attach the reproducer, but it's very simple USB configuration, 
using the /dev/raw-gadget interface with some more USB interactions 
to manage LEDs configuration and pass checks in asus_kbd_init() 
and asus_kbd_get_functions() in case of hid-asus.c.
I triggered the issue by connecting a device and immediately 
disconnecting it, so that the remove function runs before the LED one
which remains pending.

I am attaching multiple patches for asus and bigben drivers. 
The proposed patches introduce safe wrappers to schedule the workers
safely with several spinlocks checks.

I attach the (partial for brevity) ODEBUG dumps:

```hid-bigbenff.c
[   37.803135][ T1170] usb 1-1: USB disconnect, device number 2
[   37.827979][ T1170] ODEBUG: free active (active state 0) object
type: work_struct hint: bigben_worker+0x0/0x860
[   37.829634][ T1170] WARNING: CPU: 0 PID: 1170 at
lib/debugobjects.c:505 debug_check_no_obj_freed+0x43a/0x630
[   37.830904][ T1170] Modules linked in:
[   37.831413][ T1170] CPU: 0 PID: 1170 Comm: kworker/0:3 Not tainted
6.1.0-rc4-dirty #43
[   37.832465][ T1170] Hardware name: QEMU Standard PC (i440FX + PIIX,
1996), BIOS 1.13.0-1ubuntu1.1 04/01/2014
[   37.833751][ T1170] Workqueue: usb_hub_wq hub_event
[   37.834409][ T1170] RIP: 0010:debug_check_no_obj_freed+0x43a/0x630
[   37.835218][ T1170] Code: 48 89 ef e8 28 82 58 ff 49 8b 14 24 4c 8b
45 00 48 c7 c7 40 5f 09 87 48 c7 c6 60 5b 09 87 89 d9 4d 89 f9 31 c0
e8 46 25 ef fe <0f> 0b 4c 8b 64 24 20 48 ba 00 00 00 00 00 fc ff df ff
05 4f 7c 17
[   37.837667][ T1170] RSP: 0018:ffffc900006fee60 EFLAGS: 00010246
[   37.838503][ T1170] RAX: 0d2d19ffcded3d00 RBX: 0000000000000000
RCX: ffff888117fc9b00
[   37.839519][ T1170] RDX: 0000000000000000 RSI: 0000000000000000
RDI: 0000000000000000
[   37.840570][ T1170] RBP: ffffffff86e88380 R08: ffffffff8130793b
R09: fffff520000dfd85
[   37.841618][ T1170] R10: fffff520000dfd85 R11: 0000000000000000
R12: ffffffff87095fb8
[   37.842649][ T1170] R13: ffff888117770ad8 R14: ffff888117770acc
R15: ffffffff852b7420
[   37.843728][ T1170] FS:  0000000000000000(0000)
GS:ffff8881f6600000(0000) knlGS:0000000000000000
[   37.844877][ T1170] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   37.845749][ T1170] CR2: 00007f992eaab380 CR3: 000000011834b000
CR4: 00000000001006f0
[   37.846794][ T1170] Call Trace:
[   37.847245][ T1170]  <TASK>
[   37.847643][ T1170]  slab_free_freelist_hook+0x89/0x160
[   37.848409][ T1170]  ? devres_release_all+0x262/0x350
[   37.849156][ T1170]  __kmem_cache_free+0x71/0x110
[   37.849829][ T1170]  devres_release_all+0x262/0x350
[   37.850478][ T1170]  ? devres_release+0x90/0x90
[   37.851118][ T1170]  device_release_driver_internal+0x5e5/0x8a0
[   37.851944][ T1170]  bus_remove_device+0x2ea/0x400
[   37.852611][ T1170]  device_del+0x64f/0xb40
[   37.853212][ T1170]  ? kill_device+0x150/0x150
[   37.853831][ T1170]  ? print_irqtrace_events+0x1f0/0x1f0
[   37.854564][ T1170]  hid_destroy_device+0x66/0x100
[   37.855226][ T1170]  usbhid_disconnect+0x9a/0xc0
[   37.855887][ T1170]  usb_unbind_interface+0x1e1/0x890
```

``` hid-asus.c
[   77.409878][ T1169] usb 1-1: USB disconnect, device number 2
[   77.423606][ T1169] ODEBUG: free active (active state 0) object
type: work_struct hint: asus_kbd_backlight_work+0x0/0x2c0
[   77.425222][ T1169] WARNING: CPU: 0 PID: 1169 at
lib/debugobjects.c:505 debug_check_no_obj_freed+0x43a/0x630
[   77.426599][ T1169] Modules linked in:
[   77.427322][ T1169] CPU: 0 PID: 1169 Comm: kworker/0:3 Not tainted
6.1.0-rc4-dirty #43
[   77.428404][ T1169] Hardware name: QEMU Standard PC (i440FX + PIIX,
1996), BIOS 1.13.0-1ubuntu1.1 04/01/2014
[   77.429644][ T1169] Workqueue: usb_hub_wq hub_event
[   77.430296][ T1169] RIP: 0010:debug_check_no_obj_freed+0x43a/0x630
[   77.431142][ T1169] Code: 48 89 ef e8 28 82 58 ff 49 8b 14 24 4c 8b
45 00 48 c7 c7 40 5f 09 87 48 c7 c6 60 5b 09 87 89 d9 4d 89 f9 31 c0
e8 46 25 ef fe <0f> 0b 4c 8b 64 24 20 48 ba 00 00 00 00 00 fc ff df ff
05 4f 7c 17
[   77.433691][ T1169] RSP: 0018:ffffc9000069ee60 EFLAGS: 00010246
[   77.434470][ T1169] RAX: b85d2b40c12d7600 RBX: 0000000000000000
RCX: ffff888117a78000
[   77.435507][ T1169] RDX: 0000000000000000 RSI: 0000000080000000
RDI: 0000000000000000
[   77.436521][ T1169] RBP: ffffffff86e88380 R08: ffffffff8130793b
R09: ffffed103ecc4ed6
[   77.437582][ T1169] R10: ffffed103ecc4ed6 R11: 0000000000000000
R12: ffffffff87095fb8
[   77.438593][ T1169] R13: ffff88810e348fe0 R14: ffff88810e348fd4
R15: ffffffff852b5780
[   77.439667][ T1169] FS:  0000000000000000(0000)
GS:ffff8881f6600000(0000) knlGS:0000000000000000
[   77.440842][ T1169] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   77.441688][ T1169] CR2: 00007ffc05495ff0 CR3: 000000010cdf0000
CR4: 00000000001006f0
[   77.442720][ T1169] Call Trace:
[   77.443167][ T1169]  <TASK>
[   77.443555][ T1169]  slab_free_freelist_hook+0x89/0x160
[   77.444302][ T1169]  ? devres_release_all+0x262/0x350
[   77.444990][ T1169]  __kmem_cache_free+0x71/0x110
[   77.445638][ T1169]  devres_release_all+0x262/0x350
[   77.446309][ T1169]  ? devres_release+0x90/0x90
[   77.446978][ T1169]  device_release_driver_internal+0x5e5/0x8a0
[   77.447748][ T1169]  bus_remove_device+0x2ea/0x400
[   77.448421][ T1169]  device_del+0x64f/0xb40
[   77.448976][ T1169]  ? kill_device+0x150/0x150
[   77.449577][ T1169]  ? print_irqtrace_events+0x1f0/0x1f0
[   77.450307][ T1169]  hid_destroy_device+0x66/0x100
[   77.450938][ T1169]  usbhid_disconnect+0x9a/0xc0
```

Signed-off-by: Pietro Borrello <[e-mail]>
---
Changes in v3:
- use spinlocks to prevent workers scheduling
- drop patches on sony & playstation hid drivers
- Link to v2: https://lore.kernel.org/r/[e-mail]

Changes in v2:
- dualshock4: Clarify UAF
- dualsense:  Clarify UAF
- dualsense:  Unregister multicolor led controller
- Link to v1: https://lore.kernel.org/r/[e-mail]

---
Pietro Borrello (2):
      HID: bigben: use spinlock to safely schedule workers
      HID: asus: use spinlock to safely schedule workers

 drivers/hid/hid-asus.c     | 24 +++++++++++++++++++++---
 drivers/hid/hid-bigbenff.c | 34 +++++++++++++++++++++++++++++-----
 2 files changed, 50 insertions(+), 8 deletions(-)
---
base-commit: 2241ab53cbb5cdb08a6b2d4688feb13971058f65
change-id: 20230125-hid-unregister-leds-4cbf67099e1d

Best regards,