Re: WARNING in add_taint/usb_submit_urb

[Andrey Konovalov]

On Tue, Apr 7, 2020 at 4:35 PM syzbot
<syzbot+f44561cfce4cc0e75b89@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote:
>
> Hello,
>
> syzbot found the following crash on:
>
> HEAD commit:    0fa84af8 Merge tag 'usb-serial-5.7-rc1' of https://git.ker..
> git tree:       https://github.com/google/kasan.git usb-fuzzer
> console output: https://syzkaller.appspot.com/x/log.txt?x=11cce12be00000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=6b9c154b0c23aecf
> dashboard link: https://syzkaller.appspot.com/bug?extid=f44561cfce4cc0e75b89
> compiler:       gcc (GCC) 9.0.0 20181231 (experimental)
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=17a8312be00000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=14e35d8fe00000
>
> IMPORTANT: if you fix the bug, please add the following tag to the commit:
> Reported-by: syzbot+f44561cfce4cc0e75b89@xxxxxxxxxxxxxxxxxxxxxxxxx
>
> ------------[ cut here ]------------
> usb 1-1: BOGUS urb xfer, pipe 1 != type 3
> WARNING: CPU: 1 PID: 384 at drivers/usb/core/urb.c:478 usb_submit_urb+0x1188/0x1460 drivers/usb/core/urb.c:478
> Kernel panic - not syncing: panic_on_warn set ...
> CPU: 1 PID: 384 Comm: systemd-udevd Not tainted 5.6.0-rc7-syzkaller #0
> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
> Call Trace:
>  __dump_stack lib/dump_stack.c:77 [inline]
>  dump_stack+0xef/0x16e lib/dump_stack.c:118
>  usb_submit_urb+0x10b0/0x1460 drivers/usb/core/urb.c:363
>  panic+0x2aa/0x6e1 kernel/panic.c:221
>  add_taint.cold+0x16/0x16 kernel/panic.c:434
>  set_bit include/asm-generic/bitops/instrumented-atomic.h:28 [inline]
>  set_ti_thread_flag include/linux/thread_info.h:55 [inline]
>  set_fs arch/x86/include/asm/uaccess.h:33 [inline]
>  __probe_kernel_read+0x188/0x1d0 mm/maccess.c:67
>  __warn.cold+0x14/0x30 kernel/panic.c:581
>  __warn+0xd5/0x1c8 kernel/panic.c:574
>  usb_submit_urb+0x1188/0x1460 drivers/usb/core/urb.c:478
>  __warn.cold+0x2f/0x30 kernel/panic.c:582
>  usb_submit_urb+0x1188/0x1460 drivers/usb/core/urb.c:478
>  report_bug+0x27b/0x2f0 lib/bug.c:195
>  fixup_bug arch/x86/kernel/traps.c:174 [inline]
>  fixup_bug arch/x86/kernel/traps.c:169 [inline]
>  do_error_trap+0x12b/0x1e0 arch/x86/kernel/traps.c:267
>  usb_submit_urb+0x1188/0x1460 drivers/usb/core/urb.c:478
>  do_invalid_op+0x32/0x40 arch/x86/kernel/traps.c:286
>  usb_submit_urb+0x1188/0x1460 drivers/usb/core/urb.c:478
>  invalid_op+0x23/0x30 arch/x86/entry/entry_64.S:1027
> RIP: 0010:usb_submit_urb+0x1188/0x1460 drivers/usb/core/urb.c:478
> Code: 4d 85 e
>
>
> ---
> This bug is generated by a bot. It may contain errors.
> See https://goo.gl/tpsmEJ for more information about syzbot.
> syzbot engineers can be reached at syzkaller@xxxxxxxxxxxxxxxxx
>
> syzbot will keep track of this bug report. See:
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> syzbot can test patches for this bug, for details see:
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+GTCO maintainers.

Proper report:

input: GTCO_CalComp as
/devices/platform/dummy_hcd.0/usb1/1-1/1-1:0.219/input/input4
------------[ cut here ]------------
usb 1-1: BOGUS urb xfer, pipe 1 != type 3
WARNING: CPU: 0 PID: 892 at drivers/usb/core/urb.c:478
usb_submit_urb+0x1189/0x1460
Modules linked in:
CPU: 0 PID: 892 Comm: systemd-udevd Not tainted 5.6.0+ #167
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.13.0-1 04/01/2014
RIP: 0010:usb_submit_urb+0x1189/0x1460 drivers/usb/core/urb.c:478
Code: 4d 85 ed 74 46 e8 d7 b5 d7 fd 4c 89 f7 e8 0f b4 16 ff 41 89 d8
44 89 e1 4c 89 ea 48 89 c6 48 c7 c7d
RSP: 0018:ffff888062f4f7f8 EFLAGS: 00010286
RAX: 0000000000000000 RBX: 0000000000000003 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff8129eb6d RDI: ffffed100c5e9ef1
RBP: ffff8880689aeb80 R08: ffff888069670000 R09: ffffed100d9443c9
R10: ffff88806ca21e43 R11: ffffed100d9443c8 R12: 0000000000000001
R13: ffff888065fa9f00 R14: ffff888068d390a0 R15: ffff88806bf67d00
FS:  00007f4b1048b8c0(0000) GS:ffff88806ca00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055ad85210280 CR3: 000000005fccc000 CR4: 00000000000006f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 gtco_input_open+0xd5/0x130 drivers/input/tablet/gtco.c:560
 input_open_device+0x171/0x2d0 drivers/input/input.c:624
 evdev_open_device drivers/input/evdev.c:414
 evdev_open+0x3eb/0x4f0 drivers/input/evdev.c:496
 chrdev_open+0x219/0x5c0 fs/char_dev.c:414
 do_dentry_open+0x4ac/0x1180 fs/open.c:797
 do_open fs/namei.c:3229
 path_openat+0x19dd/0x26f0 fs/namei.c:3346
 do_filp_open+0x203/0x260 fs/namei.c:3375
 do_sys_openat2+0x598/0x790 fs/open.c:1148
 do_sys_open+0xc3/0x140 fs/open.c:1164
 do_syscall_64+0xb6/0x5a0 arch/x86/entry/common.c:295
 entry_SYSCALL_64_after_hwframe+0x49/0xb3 arch/x86/entry/entry_64.S:175
RIP: 0033:0x7f4b0f5d2840
Code: 73 01 c3 48 8b 0d 68 77 20 00 f7 d8 64 89 01 48 83 c8 ff c3 66
0f 1f 44 00 00 83 3d 89 bb 20 00 004
RSP: 002b:00007ffce57653c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000002
RAX: ffffffffffffffda RBX: 000055ad852c88e0 RCX: 00007f4b0f5d2840
RDX: 0000000000000000 RSI: 0000000000080000 RDI: 000055ad852d12a0
RBP: 000055ad852d12a0 R08: 000055ad83f4afe3 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000020
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
irq event stamp: 6960
hardirqs last  enabled at (6959): [<ffffffff81299621>]
console_unlock+0x911/0xca0
hardirqs last disabled at (6960): [<ffffffff81004721>]
trace_hardirqs_off_thunk+0x1a/0x1c
softirqs last  enabled at (6290): [<ffffffff85c00678>] __do_softirq+0x678/0x9a5
softirqs last disabled at (6281): [<ffffffff8115a258>] irq_exit+0x178/0x1a0
---[ end trace 066086d0cefb4362 ]---