linux-kernel - KMSAN: kernel-usb-infoleak in pcan_usb_pro

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Date:   Tue, 30 Jul 2019 02:38:07 -0700
From:   syzbot <syzbot+d6a5a1a3657b596ef132@...kaller.appspotmail.com>
To:     glider@...gle.com, linux-kernel@...r.kernel.org,
        syzkaller-bugs@...glegroups.com
Subject: KMSAN: kernel-usb-infoleak in pcan_usb_pro_init

Hello,

syzbot found the following crash on:

HEAD commit:    beaab8a3 fix KASAN build
git tree:       kmsan
console output: https://syzkaller.appspot.com/x/log.txt?x=12ddda44600000
kernel config:  https://syzkaller.appspot.com/x/.config?x=4db781fe35a84ef5
dashboard link: https://syzkaller.appspot.com/bug?extid=d6a5a1a3657b596ef132
compiler:       clang version 9.0.0 (/home/glider/llvm/clang  
80fee25776c2fb61e74c1ecb1a523375c2500b69)
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=16e3625c600000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=115e7264600000

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+d6a5a1a3657b596ef132@...kaller.appspotmail.com

usb 1-1: config 0 has no interface number 0
usb 1-1: New USB device found, idVendor=0c72, idProduct=000d,  
bcdDevice=da.d3
usb 1-1: New USB device strings: Mfr=0, Product=0, SerialNumber=0
usb 1-1: config 0 descriptor??
==================================================================
BUG: KMSAN: kernel-usb-infoleak in usb_submit_urb+0x7ef/0x1f50  
/drivers/usb/core/urb.c:405
CPU: 1 PID: 3814 Comm: kworker/1:2 Not tainted 5.2.0+ #15
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+0x191/0x1f0 /lib/dump_stack.c:113
  kmsan_report+0x162/0x2d0 /mm/kmsan/kmsan_report.c:109
  kmsan_internal_check_memory+0x974/0xa80 /mm/kmsan/kmsan.c:551
  kmsan_handle_urb+0x28/0x40 /mm/kmsan/kmsan_hooks.c:621
  usb_submit_urb+0x7ef/0x1f50 /drivers/usb/core/urb.c:405
  usb_start_wait_urb+0x143/0x410 /drivers/usb/core/message.c:58
  usb_internal_control_msg /drivers/usb/core/message.c:102 [inline]
  usb_control_msg+0x49f/0x7f0 /drivers/usb/core/message.c:156
  pcan_usb_pro_send_req /drivers/net/can/usb/peak_usb/pcan_usb_pro.c:336  
[inline]
  pcan_usb_pro_drv_loaded /drivers/net/can/usb/peak_usb/pcan_usb_pro.c:504  
[inline]
  pcan_usb_pro_init+0x1319/0x1720  
/drivers/net/can/usb/peak_usb/pcan_usb_pro.c:894
  peak_usb_create_dev /drivers/net/can/usb/peak_usb/pcan_usb_core.c:809  
[inline]
  peak_usb_probe+0x1416/0x1b20  
/drivers/net/can/usb/peak_usb/pcan_usb_core.c:907
  usb_probe_interface+0xd19/0x1310 /drivers/usb/core/driver.c:361
  really_probe+0x1344/0x1d90 /drivers/base/dd.c:513
  driver_probe_device+0x1ba/0x510 /drivers/base/dd.c:670
  __device_attach_driver+0x5b8/0x790 /drivers/base/dd.c:777
  bus_for_each_drv+0x28e/0x3b0 /drivers/base/bus.c:454
  __device_attach+0x489/0x750 /drivers/base/dd.c:843
  device_initial_probe+0x4a/0x60 /drivers/base/dd.c:890
  bus_probe_device+0x131/0x390 /drivers/base/bus.c:514
  device_add+0x25b5/0x2df0 /drivers/base/core.c:2111
  usb_set_configuration+0x309f/0x3710 /drivers/usb/core/message.c:2027
  generic_probe+0xe7/0x280 /drivers/usb/core/generic.c:210
  usb_probe_device+0x146/0x200 /drivers/usb/core/driver.c:266
  really_probe+0x1344/0x1d90 /drivers/base/dd.c:513
  driver_probe_device+0x1ba/0x510 /drivers/base/dd.c:670
  __device_attach_driver+0x5b8/0x790 /drivers/base/dd.c:777
  bus_for_each_drv+0x28e/0x3b0 /drivers/base/bus.c:454
  __device_attach+0x489/0x750 /drivers/base/dd.c:843
  device_initial_probe+0x4a/0x60 /drivers/base/dd.c:890
  bus_probe_device+0x131/0x390 /drivers/base/bus.c:514
  device_add+0x25b5/0x2df0 /drivers/base/core.c:2111
  usb_new_device+0x23e5/0x2fb0 /drivers/usb/core/hub.c:2534
  hub_port_connect /drivers/usb/core/hub.c:5089 [inline]
  hub_port_connect_change /drivers/usb/core/hub.c:5204 [inline]
  port_event /drivers/usb/core/hub.c:5350 [inline]
  hub_event+0x5853/0x7320 /drivers/usb/core/hub.c:5432
  process_one_work+0x1572/0x1f00 /kernel/workqueue.c:2269
  worker_thread+0x111b/0x2460 /kernel/workqueue.c:2415
  kthread+0x4b5/0x4f0 /kernel/kthread.c:256
  ret_from_fork+0x35/0x40 /arch/x86/entry/entry_64.S:355

Uninit was created at:
  kmsan_save_stack_with_flags /mm/kmsan/kmsan.c:187 [inline]
  kmsan_internal_poison_shadow+0x53/0xa0 /mm/kmsan/kmsan.c:146
  kmsan_slab_alloc+0xaa/0x120 /mm/kmsan/kmsan_hooks.c:175
  slab_alloc_node /mm/slub.c:2771 [inline]
  slab_alloc /mm/slub.c:2780 [inline]
  kmem_cache_alloc_trace+0x873/0xa50 /mm/slub.c:2797
  kmalloc /./include/linux/slab.h:547 [inline]
  pcan_usb_pro_drv_loaded /drivers/net/can/usb/peak_usb/pcan_usb_pro.c:497  
[inline]
  pcan_usb_pro_init+0xe96/0x1720  
/drivers/net/can/usb/peak_usb/pcan_usb_pro.c:894
  peak_usb_create_dev /drivers/net/can/usb/peak_usb/pcan_usb_core.c:809  
[inline]
  peak_usb_probe+0x1416/0x1b20  
/drivers/net/can/usb/peak_usb/pcan_usb_core.c:907
  usb_probe_interface+0xd19/0x1310 /drivers/usb/core/driver.c:361
  really_probe+0x1344/0x1d90 /drivers/base/dd.c:513
  driver_probe_device+0x1ba/0x510 /drivers/base/dd.c:670
  __device_attach_driver+0x5b8/0x790 /drivers/base/dd.c:777
  bus_for_each_drv+0x28e/0x3b0 /drivers/base/bus.c:454
  __device_attach+0x489/0x750 /drivers/base/dd.c:843
  device_initial_probe+0x4a/0x60 /drivers/base/dd.c:890
  bus_probe_device+0x131/0x390 /drivers/base/bus.c:514
  device_add+0x25b5/0x2df0 /drivers/base/core.c:2111
  usb_set_configuration+0x309f/0x3710 /drivers/usb/core/message.c:2027
  generic_probe+0xe7/0x280 /drivers/usb/core/generic.c:210
  usb_probe_device+0x146/0x200 /drivers/usb/core/driver.c:266
  really_probe+0x1344/0x1d90 /drivers/base/dd.c:513
  driver_probe_device+0x1ba/0x510 /drivers/base/dd.c:670
  __device_attach_driver+0x5b8/0x790 /drivers/base/dd.c:777
  bus_for_each_drv+0x28e/0x3b0 /drivers/base/bus.c:454
  __device_attach+0x489/0x750 /drivers/base/dd.c:843
  device_initial_probe+0x4a/0x60 /drivers/base/dd.c:890
  bus_probe_device+0x131/0x390 /drivers/base/bus.c:514
  device_add+0x25b5/0x2df0 /drivers/base/core.c:2111
  usb_new_device+0x23e5/0x2fb0 /drivers/usb/core/hub.c:2534
  hub_port_connect /drivers/usb/core/hub.c:5089 [inline]
  hub_port_connect_change /drivers/usb/core/hub.c:5204 [inline]
  port_event /drivers/usb/core/hub.c:5350 [inline]
  hub_event+0x5853/0x7320 /drivers/usb/core/hub.c:5432
  process_one_work+0x1572/0x1f00 /kernel/workqueue.c:2269
  worker_thread+0x111b/0x2460 /kernel/workqueue.c:2415
  kthread+0x4b5/0x4f0 /kernel/kthread.c:256
  ret_from_fork+0x35/0x40 /arch/x86/entry/entry_64.S:355

Bytes 2-15 of 16 are uninitialized
Memory access of size 16 starts at ffff8881030286e0
==================================================================


---
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