KMSAN: kernel-usb-infoleak in usbnet_write

KMSAN: kernel-usb-infoleak in usbnet_write_cmd (2)
Status: upstream: reported on 2020/12/12 07:43
Reported-by: syzbot+11567dab5754ad6ee82a@syzkaller.appspotmail.com
First crash: 128d, last: 99d

similar bugs (1):
Kernel	Title	Repro	Cause bisect	Fix bisect	Count	Last	Reported	Patched	Status
upstream	KMSAN: kernel-usb-infoleak in usbnet_write_cmd				1	653d	622d	0/22	auto-closed as invalid on 2019/10/30 07:33

Sample crash report:

smsc75xx 4-1:1.0 (unnamed net_device) (uninitialized): Failed to read reg index 0x00000040: -32
smsc75xx 4-1:1.0 (unnamed net_device) (uninitialized): Error reading E2P_CMD
=====================================================
BUG: KMSAN: kernel-usb-infoleak in kmsan_handle_urb+0x28/0x40 mm/kmsan/kmsan_hooks.c:303
CPU: 0 PID: 8487 Comm: kworker/0:3 Not tainted 5.10.0-rc4-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: usb_hub_wq hub_event
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x21c/0x280 lib/dump_stack.c:118
 kmsan_report+0xf7/0x1e0 mm/kmsan/kmsan_report.c:118
 kmsan_internal_check_memory+0x484/0x520 mm/kmsan/kmsan.c:437
 kmsan_handle_urb+0x28/0x40 mm/kmsan/kmsan_hooks.c:303
 usb_submit_urb+0x87f/0x2530 drivers/usb/core/urb.c:421
 usb_start_wait_urb+0x155/0x4c0 drivers/usb/core/message.c:58
 usb_internal_control_msg drivers/usb/core/message.c:102 [inline]
 usb_control_msg+0x495/0x7d0 drivers/usb/core/message.c:153
 __usbnet_write_cmd drivers/net/usb/usbnet.c:2010 [inline]
 usbnet_write_cmd+0x3d3/0x480 drivers/net/usb/usbnet.c:2048
 __smsc75xx_write_reg drivers/net/usb/smsc75xx.c:122 [inline]
 smsc75xx_write_reg drivers/net/usb/smsc75xx.c:153 [inline]
 smsc75xx_reset+0x389/0x8030 drivers/net/usb/smsc75xx.c:1065
 smsc75xx_bind+0xf5a/0x13f0 drivers/net/usb/smsc75xx.c:1492
 usbnet_probe+0x1169/0x3e90 drivers/net/usb/usbnet.c:1712
 usb_probe_interface+0xfcc/0x1520 drivers/usb/core/driver.c:396
 really_probe+0xebd/0x2420 drivers/base/dd.c:558
 driver_probe_device+0x293/0x390 drivers/base/dd.c:738
 __device_attach_driver+0x63f/0x830 drivers/base/dd.c:844
 bus_for_each_drv+0x2ca/0x3f0 drivers/base/bus.c:431
 __device_attach+0x538/0x860 drivers/base/dd.c:912
 device_initial_probe+0x4a/0x60 drivers/base/dd.c:959
 bus_probe_device+0x177/0x3d0 drivers/base/bus.c:491
 device_add+0x399e/0x3f20 drivers/base/core.c:2936
 usb_set_configuration+0x39cf/0x4010 drivers/usb/core/message.c:2159
 usb_generic_driver_probe+0x138/0x300 drivers/usb/core/generic.c:238
 usb_probe_device+0x317/0x570 drivers/usb/core/driver.c:293
 really_probe+0xebd/0x2420 drivers/base/dd.c:558
 driver_probe_device+0x293/0x390 drivers/base/dd.c:738
 __device_attach_driver+0x63f/0x830 drivers/base/dd.c:844
 bus_for_each_drv+0x2ca/0x3f0 drivers/base/bus.c:431
 __device_attach+0x538/0x860 drivers/base/dd.c:912
 device_initial_probe+0x4a/0x60 drivers/base/dd.c:959
 bus_probe_device+0x177/0x3d0 drivers/base/bus.c:491
 device_add+0x399e/0x3f20 drivers/base/core.c:2936
 usb_new_device+0x1bd6/0x2a30 drivers/usb/core/hub.c:2554
 hub_port_connect drivers/usb/core/hub.c:5222 [inline]
 hub_port_connect_change drivers/usb/core/hub.c:5362 [inline]
 port_event drivers/usb/core/hub.c:5508 [inline]
 hub_event+0x5bc9/0x8890 drivers/usb/core/hub.c:5590
 process_one_work+0x121c/0x1fc0 kernel/workqueue.c:2272
 process_scheduled_works kernel/workqueue.c:2334 [inline]
 worker_thread+0x129c/0x2740 kernel/workqueue.c:2420
 kthread+0x51c/0x560 kernel/kthread.c:292
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296

Uninit was stored to memory at:
 kmsan_save_stack_with_flags mm/kmsan/kmsan.c:121 [inline]
 kmsan_internal_chain_origin+0xad/0x130 mm/kmsan/kmsan.c:289
 kmsan_memcpy_memmove_metadata+0x25e/0x2d0 mm/kmsan/kmsan.c:226
 kmsan_memcpy_metadata+0xb/0x10 mm/kmsan/kmsan.c:246
 __msan_memcpy+0x46/0x60 mm/kmsan/kmsan_instr.c:110
 kmemdup+0x107/0x140 mm/util.c:130
 __usbnet_write_cmd drivers/net/usb/usbnet.c:1999 [inline]
 usbnet_write_cmd+0x1a0/0x480 drivers/net/usb/usbnet.c:2048
 __smsc75xx_write_reg drivers/net/usb/smsc75xx.c:122 [inline]
 smsc75xx_write_reg drivers/net/usb/smsc75xx.c:153 [inline]
 smsc75xx_reset+0x389/0x8030 drivers/net/usb/smsc75xx.c:1065
 smsc75xx_bind+0xf5a/0x13f0 drivers/net/usb/smsc75xx.c:1492
 usbnet_probe+0x1169/0x3e90 drivers/net/usb/usbnet.c:1712
 usb_probe_interface+0xfcc/0x1520 drivers/usb/core/driver.c:396
 really_probe+0xebd/0x2420 drivers/base/dd.c:558
 driver_probe_device+0x293/0x390 drivers/base/dd.c:738
 __device_attach_driver+0x63f/0x830 drivers/base/dd.c:844
 bus_for_each_drv+0x2ca/0x3f0 drivers/base/bus.c:431
 __device_attach+0x538/0x860 drivers/base/dd.c:912
 device_initial_probe+0x4a/0x60 drivers/base/dd.c:959
 bus_probe_device+0x177/0x3d0 drivers/base/bus.c:491
 device_add+0x399e/0x3f20 drivers/base/core.c:2936
 usb_set_configuration+0x39cf/0x4010 drivers/usb/core/message.c:2159
 usb_generic_driver_probe+0x138/0x300 drivers/usb/core/generic.c:238
 usb_probe_device+0x317/0x570 drivers/usb/core/driver.c:293
 really_probe+0xebd/0x2420 drivers/base/dd.c:558
 driver_probe_device+0x293/0x390 drivers/base/dd.c:738
 __device_attach_driver+0x63f/0x830 drivers/base/dd.c:844
 bus_for_each_drv+0x2ca/0x3f0 drivers/base/bus.c:431
 __device_attach+0x538/0x860 drivers/base/dd.c:912
 device_initial_probe+0x4a/0x60 drivers/base/dd.c:959
 bus_probe_device+0x177/0x3d0 drivers/base/bus.c:491
 device_add+0x399e/0x3f20 drivers/base/core.c:2936
 usb_new_device+0x1bd6/0x2a30 drivers/usb/core/hub.c:2554
 hub_port_connect drivers/usb/core/hub.c:5222 [inline]
 hub_port_connect_change drivers/usb/core/hub.c:5362 [inline]
 port_event drivers/usb/core/hub.c:5508 [inline]
 hub_event+0x5bc9/0x8890 drivers/usb/core/hub.c:5590
 process_one_work+0x121c/0x1fc0 kernel/workqueue.c:2272
 process_scheduled_works kernel/workqueue.c:2334 [inline]
 worker_thread+0x129c/0x2740 kernel/workqueue.c:2420
 kthread+0x51c/0x560 kernel/kthread.c:292
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296

Uninit was stored to memory at:
 kmsan_save_stack_with_flags mm/kmsan/kmsan.c:121 [inline]
 kmsan_internal_chain_origin+0xad/0x130 mm/kmsan/kmsan.c:289
 __msan_chain_origin+0x57/0xa0 mm/kmsan/kmsan_instr.c:147
 __smsc75xx_write_reg drivers/net/usb/smsc75xx.c:119 [inline]
 smsc75xx_write_reg drivers/net/usb/smsc75xx.c:153 [inline]
 smsc75xx_reset+0x18fa/0x8030 drivers/net/usb/smsc75xx.c:1065
 smsc75xx_bind+0xf5a/0x13f0 drivers/net/usb/smsc75xx.c:1492
 usbnet_probe+0x1169/0x3e90 drivers/net/usb/usbnet.c:1712
 usb_probe_interface+0xfcc/0x1520 drivers/usb/core/driver.c:396
 really_probe+0xebd/0x2420 drivers/base/dd.c:558
 driver_probe_device+0x293/0x390 drivers/base/dd.c:738
 __device_attach_driver+0x63f/0x830 drivers/base/dd.c:844
 bus_for_each_drv+0x2ca/0x3f0 drivers/base/bus.c:431
 __device_attach+0x538/0x860 drivers/base/dd.c:912
 device_initial_probe+0x4a/0x60 drivers/base/dd.c:959
 bus_probe_device+0x177/0x3d0 drivers/base/bus.c:491
 device_add+0x399e/0x3f20 drivers/base/core.c:2936
 usb_set_configuration+0x39cf/0x4010 drivers/usb/core/message.c:2159
 usb_generic_driver_probe+0x138/0x300 drivers/usb/core/generic.c:238
 usb_probe_device+0x317/0x570 drivers/usb/core/driver.c:293
 really_probe+0xebd/0x2420 drivers/base/dd.c:558
 driver_probe_device+0x293/0x390 drivers/base/dd.c:738
 __device_attach_driver+0x63f/0x830 drivers/base/dd.c:844
 bus_for_each_drv+0x2ca/0x3f0 drivers/base/bus.c:431
 __device_attach+0x538/0x860 drivers/base/dd.c:912
 device_initial_probe+0x4a/0x60 drivers/base/dd.c:959
 bus_probe_device+0x177/0x3d0 drivers/base/bus.c:491
 device_add+0x399e/0x3f20 drivers/base/core.c:2936
 usb_new_device+0x1bd6/0x2a30 drivers/usb/core/hub.c:2554
 hub_port_connect drivers/usb/core/hub.c:5222 [inline]
 hub_port_connect_change drivers/usb/core/hub.c:5362 [inline]
 port_event drivers/usb/core/hub.c:5508 [inline]
 hub_event+0x5bc9/0x8890 drivers/usb/core/hub.c:5590
 process_one_work+0x121c/0x1fc0 kernel/workqueue.c:2272
 process_scheduled_works kernel/workqueue.c:2334 [inline]
 worker_thread+0x129c/0x2740 kernel/workqueue.c:2420
 kthread+0x51c/0x560 kernel/kthread.c:292
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296

Local variable ----buf.i.i@smsc75xx_reset created at:
 __smsc75xx_read_reg drivers/net/usb/smsc75xx.c:976 [inline]
 smsc75xx_read_reg drivers/net/usb/smsc75xx.c:147 [inline]
 smsc75xx_reset+0x23a/0x8030 drivers/net/usb/smsc75xx.c:1057
 __smsc75xx_read_reg drivers/net/usb/smsc75xx.c:976 [inline]
 smsc75xx_read_reg drivers/net/usb/smsc75xx.c:147 [inline]
 smsc75xx_reset+0x23a/0x8030 drivers/net/usb/smsc75xx.c:1057

Bytes 0-3 of 4 are uninitialized
Memory access of size 4 starts at ffff88817107d9d0
=====================================================

Crashes (4):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	VM info
ci-upstream-kmsan-gce	2021/01/05 20:26	https://github.com/google/kmsan.git master	73d62e81	a0234d98	.config	log	report	info
ci-upstream-kmsan-gce	2020/12/08 01:51	https://github.com/google/kmsan.git master	73d62e81	51a9082e	.config	log	report	info
ci-upstream-kmsan-gce-386	2021/01/05 22:16	https://github.com/google/kmsan.git master	73d62e81	a0234d98	.config	log	report	info
ci-upstream-kmsan-gce-386	2021/01/05 20:36	https://github.com/google/kmsan.git master	73d62e81	a0234d98	.config	log	report	info