On Feb 12 2023, Pietro Borrello wrote: > 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 <borrello@xxxxxxxxxxxxxxxx> > --- > Changes in v4: > - Split patches that add spinlock wrt the patches that check scheduling > - Smaller locked regions > - Link to v3: https://lore.kernel.org/r/20230125-hid-unregister-leds-v3-0-0a52ac225e00@xxxxxxxxxxxxxxxx > > Changes in v3: > - use spinlocks to prevent workers scheduling > - drop patches on sony & playstation hid drivers > - Link to v2: https://lore.kernel.org/r/20230125-hid-unregister-leds-v2-0-689cc62fc878@xxxxxxxxxxxxxxxx > > Changes in v2: > - dualshock4: Clarify UAF > - dualsense: Clarify UAF > - dualsense: Unregister multicolor led controller > - Link to v1: https://lore.kernel.org/r/20230125-hid-unregister-leds-v1-0-9a5192dcef16@xxxxxxxxxxxxxxxx > > --- > Pietro Borrello (5): > HID: bigben: use spinlock to protect concurrent accesses > HID: bigben_worker() remove unneeded check on report_field > HID: bigben: use spinlock to safely schedule workers > HID: asus: use spinlock to protect concurrent accesses > HID: asus: use spinlock to safely schedule workers > > drivers/hid/hid-asus.c | 37 +++++++++++++++++++++---- > drivers/hid/hid-bigbenff.c | 68 +++++++++++++++++++++++++++++++++++++++++----- > 2 files changed, 93 insertions(+), 12 deletions(-) And patches 1-3 applied to hid/hid.git branch for-6.3/bigben Cheers, Benjamin > --- > base-commit: 2241ab53cbb5cdb08a6b2d4688feb13971058f65 > change-id: 20230125-hid-unregister-leds-4cbf67099e1d > > Best regards, > -- > Pietro Borrello <borrello@xxxxxxxxxxxxxxxx> >
