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Message-ID: <000000000000d8dffc05907a1825@google.com>
Date:   Mon, 19 Aug 2019 08:36:00 -0700
From:   syzbot <syzbot+cfe6d93e0abab9a0de05@...kaller.appspotmail.com>
To:     andreyknvl@...gle.com, gregkh@...uxfoundation.org,
        gustavo@...eddedor.com, keescook@...omium.org,
        linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org,
        oneukum@...e.com, syzkaller-bugs@...glegroups.com
Subject: Re: KASAN: use-after-free Read in iowarrior_disconnect

Hello,

syzbot has tested the proposed patch but the reproducer still triggered  
crash:
possible deadlock in usb_deregister_dev

usb 4-1: USB disconnect, device number 2
======================================================
WARNING: possible circular locking dependency detected
5.3.0-rc4+ #1 Not tainted
------------------------------------------------------
kworker/1:1/21 is trying to acquire lock:
00000000bfac431a (minor_rwsem){++++}, at: usb_deregister_dev  
drivers/usb/core/file.c:238 [inline]
00000000bfac431a (minor_rwsem){++++}, at: usb_deregister_dev+0x61/0x270  
drivers/usb/core/file.c:230

but task is already holding lock:
000000007638fa06 (iowarrior_open_disc_lock){+.+.}, at:  
iowarrior_disconnect+0x45/0x2c0 drivers/usb/misc/iowarrior.c:867

which lock already depends on the new lock.


the existing dependency chain (in reverse order) is:

-> #2 (iowarrior_open_disc_lock){+.+.}:
        __mutex_lock_common kernel/locking/mutex.c:930 [inline]
        __mutex_lock+0x158/0x1360 kernel/locking/mutex.c:1077
        iowarrior_open+0x8a/0x2a0 drivers/usb/misc/iowarrior.c:600
        usb_open+0x1df/0x270 drivers/usb/core/file.c:48
        chrdev_open+0x219/0x5c0 fs/char_dev.c:414
        do_dentry_open+0x494/0x1120 fs/open.c:797
        do_last fs/namei.c:3416 [inline]
        path_openat+0x1430/0x3f50 fs/namei.c:3533
        do_filp_open+0x1a1/0x280 fs/namei.c:3563
        do_sys_open+0x3c0/0x580 fs/open.c:1089
        do_syscall_64+0xb7/0x580 arch/x86/entry/common.c:296
        entry_SYSCALL_64_after_hwframe+0x49/0xbe

-> #1 (iowarrior_mutex){+.+.}:
        __mutex_lock_common kernel/locking/mutex.c:930 [inline]
        __mutex_lock+0x158/0x1360 kernel/locking/mutex.c:1077
        iowarrior_open+0x23/0x2a0 drivers/usb/misc/iowarrior.c:589
        usb_open+0x1df/0x270 drivers/usb/core/file.c:48
        chrdev_open+0x219/0x5c0 fs/char_dev.c:414
        do_dentry_open+0x494/0x1120 fs/open.c:797
        do_last fs/namei.c:3416 [inline]
        path_openat+0x1430/0x3f50 fs/namei.c:3533
        do_filp_open+0x1a1/0x280 fs/namei.c:3563
        do_sys_open+0x3c0/0x580 fs/open.c:1089
        do_syscall_64+0xb7/0x580 arch/x86/entry/common.c:296
        entry_SYSCALL_64_after_hwframe+0x49/0xbe

-> #0 (minor_rwsem){++++}:
        check_prev_add kernel/locking/lockdep.c:2405 [inline]
        check_prevs_add kernel/locking/lockdep.c:2507 [inline]
        validate_chain kernel/locking/lockdep.c:2897 [inline]
        __lock_acquire+0x1f7c/0x3b50 kernel/locking/lockdep.c:3880
        lock_acquire+0x127/0x320 kernel/locking/lockdep.c:4412
        down_write+0x92/0x150 kernel/locking/rwsem.c:1500
        usb_deregister_dev drivers/usb/core/file.c:238 [inline]
        usb_deregister_dev+0x61/0x270 drivers/usb/core/file.c:230
        iowarrior_disconnect+0xa8/0x2c0 drivers/usb/misc/iowarrior.c:873
        usb_unbind_interface+0x1bd/0x8a0 drivers/usb/core/driver.c:423
        __device_release_driver drivers/base/dd.c:1134 [inline]
        device_release_driver_internal+0x42f/0x500 drivers/base/dd.c:1165
        bus_remove_device+0x2dc/0x4a0 drivers/base/bus.c:556
        device_del+0x420/0xb10 drivers/base/core.c:2339
        usb_disable_device+0x211/0x690 drivers/usb/core/message.c:1237
        usb_disconnect+0x284/0x8d0 drivers/usb/core/hub.c:2199
        hub_port_connect drivers/usb/core/hub.c:4949 [inline]
        hub_port_connect_change drivers/usb/core/hub.c:5213 [inline]
        port_event drivers/usb/core/hub.c:5359 [inline]
        hub_event+0x1454/0x3640 drivers/usb/core/hub.c:5441
        process_one_work+0x92b/0x1530 kernel/workqueue.c:2269
        worker_thread+0x96/0xe20 kernel/workqueue.c:2415
        kthread+0x318/0x420 kernel/kthread.c:255
        ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352

other info that might help us debug this:

Chain exists of:
   minor_rwsem --> iowarrior_mutex --> iowarrior_open_disc_lock

  Possible unsafe locking scenario:

        CPU0                    CPU1
        ----                    ----
   lock(iowarrior_open_disc_lock);
                                lock(iowarrior_mutex);
                                lock(iowarrior_open_disc_lock);
   lock(minor_rwsem);

  *** DEADLOCK ***

6 locks held by kworker/1:1/21:
  #0: 00000000ffafc5b3 ((wq_completion)usb_hub_wq){+.+.}, at:  
__write_once_size include/linux/compiler.h:226 [inline]
  #0: 00000000ffafc5b3 ((wq_completion)usb_hub_wq){+.+.}, at:  
arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline]
  #0: 00000000ffafc5b3 ((wq_completion)usb_hub_wq){+.+.}, at: atomic64_set  
include/asm-generic/atomic-instrumented.h:855 [inline]
  #0: 00000000ffafc5b3 ((wq_completion)usb_hub_wq){+.+.}, at:  
atomic_long_set include/asm-generic/atomic-long.h:40 [inline]
  #0: 00000000ffafc5b3 ((wq_completion)usb_hub_wq){+.+.}, at: set_work_data  
kernel/workqueue.c:620 [inline]
  #0: 00000000ffafc5b3 ((wq_completion)usb_hub_wq){+.+.}, at:  
set_work_pool_and_clear_pending kernel/workqueue.c:647 [inline]
  #0: 00000000ffafc5b3 ((wq_completion)usb_hub_wq){+.+.}, at:  
process_one_work+0x827/0x1530 kernel/workqueue.c:2240
  #1: 000000005bc0df0d ((work_completion)(&hub->events)){+.+.}, at:  
process_one_work+0x85b/0x1530 kernel/workqueue.c:2244
  #2: 00000000f73a9504 (&dev->mutex){....}, at: device_lock  
include/linux/device.h:1223 [inline]
  #2: 00000000f73a9504 (&dev->mutex){....}, at: hub_event+0x17c/0x3640  
drivers/usb/core/hub.c:5387
  #3: 000000006fe9ca35 (&dev->mutex){....}, at: device_lock  
include/linux/device.h:1223 [inline]
  #3: 000000006fe9ca35 (&dev->mutex){....}, at: usb_disconnect+0x91/0x8d0  
drivers/usb/core/hub.c:2190
  #4: 0000000044c331cb (&dev->mutex){....}, at:  
device_release_driver_internal+0x23/0x500 drivers/base/dd.c:1162
  #5: 000000007638fa06 (iowarrior_open_disc_lock){+.+.}, at:  
iowarrior_disconnect+0x45/0x2c0 drivers/usb/misc/iowarrior.c:867

stack backtrace:
CPU: 1 PID: 21 Comm: kworker/1:1 Not tainted 5.3.0-rc4+ #1
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+0xca/0x13e lib/dump_stack.c:113
  check_noncircular+0x345/0x3e0 kernel/locking/lockdep.c:1741
  check_prev_add kernel/locking/lockdep.c:2405 [inline]
  check_prevs_add kernel/locking/lockdep.c:2507 [inline]
  validate_chain kernel/locking/lockdep.c:2897 [inline]
  __lock_acquire+0x1f7c/0x3b50 kernel/locking/lockdep.c:3880
  lock_acquire+0x127/0x320 kernel/locking/lockdep.c:4412
  down_write+0x92/0x150 kernel/locking/rwsem.c:1500
  usb_deregister_dev drivers/usb/core/file.c:238 [inline]
  usb_deregister_dev+0x61/0x270 drivers/usb/core/file.c:230
  iowarrior_disconnect+0xa8/0x2c0 drivers/usb/misc/iowarrior.c:873
  usb_unbind_interface+0x1bd/0x8a0 drivers/usb/core/driver.c:423
  __device_release_driver drivers/base/dd.c:1134 [inline]
  device_release_driver_internal+0x42f/0x500 drivers/base/dd.c:1165
  bus_remove_device+0x2dc/0x4a0 drivers/base/bus.c:556
  device_del+0x420/0xb10 drivers/base/core.c:2339
  usb_disable_device+0x211/0x690 drivers/usb/core/message.c:1237
  usb_disconnect+0x284/0x8d0 drivers/usb/core/hub.c:2199
  hub_port_connect drivers/usb/core/hub.c:4949 [inline]
  hub_port_connect_change drivers/usb/core/hub.c:5213 [inline]
  port_event drivers/usb/core/hub.c:5359 [inline]
  hub_event+0x1454/0x3640 drivers/usb/core/hub.c:5441
  process_one_work+0x92b/0x1530 kernel/workqueue.c:2269
  worker_thread+0x96/0xe20 kernel/workqueue.c:2415
  kthread+0x318/0x420 kernel/kthread.c:255
  ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352
iowarrior 4-1:0.236: I/O-Warror #0 now disconnected
usb 4-1: new low-speed USB device number 3 using dummy_hcd
usb 4-1: device descriptor read/all, error -71
usb 4-1: new low-speed USB device number 4 using dummy_hcd
usb 4-1: config 0 has an invalid interface number: 236 but max is 2
usb 4-1: config 0 has an invalid descriptor of length 99, skipping  
remainder of the config
usb 4-1: config 0 has 1 interface, different from the descriptor's value: 3
usb 4-1: config 0 has no interface number 0
usb 4-1: config 0 interface 236 altsetting 0 endpoint 0x81 is Bulk;  
changing to Interrupt
usb 4-1: New USB device found, idVendor=07c0, idProduct=1501,  
bcdDevice=74.a0
usb 4-1: New USB device strings: Mfr=0, Product=0, SerialNumber=0
usb 4-1: config 0 descriptor??


Tested on:

commit:         d0847550 usb-fuzzer: main usb gadget fuzzer driver
git tree:       https://github.com/google/kasan.git
console output: https://syzkaller.appspot.com/x/log.txt?x=154c4522600000
kernel config:  https://syzkaller.appspot.com/x/.config?x=dbc9c80cc095da19
compiler:       gcc (GCC) 9.0.0 20181231 (experimental)
patch:          https://syzkaller.appspot.com/x/patch.diff?x=11898be2600000

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