WARNING in usbhid_raw_request/usb_submit_urb

WARNING in usbhid_raw_request/usb_submit_urb

[syzbot]

Hello,

syzbot found the following crash on:

HEAD commit:    6a3599ce usb-fuzzer: main usb gadget fuzzer driver
git tree:       https://github.com/google/kasan.git usb-fuzzer
console output: https://syzkaller.appspot.com/x/log.txt?x=12386cb4600000
kernel config:  https://syzkaller.appspot.com/x/.config?x=700ca426ab83faae
dashboard link: https://syzkaller.appspot.com/bug?extid=a7a6b9c609b9457c62c6
compiler:       gcc (GCC) 9.0.0 20181231 (experimental)

Unfortunately, I don't have any reproducer for this crash yet.

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+a7a6b9c609b9457c62c6@syzkaller.appspotmail.com

------------[ cut here ]------------
usb 2-1: BOGUS urb xfer, pipe 2 != type 2
WARNING: CPU: 0 PID: 3730 at drivers/usb/core/urb.c:477  
usb_submit_urb+0x1188/0x13b0 drivers/usb/core/urb.c:477
Kernel panic - not syncing: panic_on_warn set ...
CPU: 0 PID: 3730 Comm: syz-executor.1 Not tainted 5.2.0-rc6+ #15
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+0xca/0x13e lib/dump_stack.c:113
  panic+0x292/0x6c9 kernel/panic.c:219
  __warn.cold+0x20/0x4b kernel/panic.c:576
  report_bug+0x262/0x2a0 lib/bug.c:186
  fixup_bug arch/x86/kernel/traps.c:179 [inline]
  fixup_bug arch/x86/kernel/traps.c:174 [inline]
  do_error_trap+0x12b/0x1e0 arch/x86/kernel/traps.c:272
  do_invalid_op+0x32/0x40 arch/x86/kernel/traps.c:291
  invalid_op+0x14/0x20 arch/x86/entry/entry_64.S:986
RIP: 0010:usb_submit_urb+0x1188/0x13b0 drivers/usb/core/urb.c:477
Code: 4d 85 ed 74 2c e8 f8 d3 f4 fd 4c 89 f7 e8 a0 51 1c ff 41 89 d8 44 89  
e1 4c 89 ea 48 89 c6 48 c7 c7 00 0e f7 85 e8 83 98 ca fd <0f> 0b e9 20 f4  
ff ff e8 cc d3 f4 fd 4c 89 f2 48 b8 00 00 00 00 00
RSP: 0018:ffff8881d4f479d0 EFLAGS: 00010282
RAX: 0000000000000000 RBX: 0000000000000002 RCX: 0000000000000000
RDX: 0000000000005dfa RSI: ffffffff8127ef3d RDI: ffffed103a9e8f2c
RBP: 0000000000000000 R08: ffff8881af663000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000002
R13: ffff8881d462ed38 R14: ffff8881d18f9a20 R15: ffff8881d80e1c00
  usb_start_wait_urb+0x108/0x2b0 drivers/usb/core/message.c:57
  usb_internal_control_msg drivers/usb/core/message.c:101 [inline]
  usb_control_msg+0x31c/0x4a0 drivers/usb/core/message.c:152
  usbhid_set_raw_report drivers/hid/usbhid/hid-core.c:917 [inline]
  usbhid_raw_request+0x21f/0x640 drivers/hid/usbhid/hid-core.c:1265
  hid_hw_raw_request include/linux/hid.h:1079 [inline]
  hidraw_send_report+0x296/0x500 drivers/hid/hidraw.c:151
  hidraw_ioctl+0x5b4/0xaf0 drivers/hid/hidraw.c:421
  vfs_ioctl fs/ioctl.c:46 [inline]
  file_ioctl fs/ioctl.c:509 [inline]
  do_vfs_ioctl+0xcda/0x12e0 fs/ioctl.c:696
  ksys_ioctl+0x9b/0xc0 fs/ioctl.c:713
  __do_sys_ioctl fs/ioctl.c:720 [inline]
  __se_sys_ioctl fs/ioctl.c:718 [inline]
  __x64_sys_ioctl+0x6f/0xb0 fs/ioctl.c:718
  do_syscall_64+0xb7/0x560 arch/x86/entry/common.c:301
  entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x459829
Code: fd b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7  
48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff  
ff 0f 83 cb b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007fe142c43c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000459829
RDX: 0000000020000000 RSI: 00000000c0404806 RDI: 0000000000000004
RBP: 000000000075bfc8 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fe142c446d4
R13: 00000000004c22ab R14: 00000000004d5630 R15: 00000000ffffffff
Kernel Offset: disabled
Rebooting in 86400 seconds..


---
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Re: WARNING in usbhid_raw_request/usb_submit_urb

[Alan Stern]

On Mon, 29 Jul 2019, syzbot wrote:

> Hello,
> 
> syzbot found the following crash on:
> 
> HEAD commit:    6a3599ce usb-fuzzer: main usb gadget fuzzer driver
> git tree:       https://github.com/google/kasan.git usb-fuzzer
> console output: https://syzkaller.appspot.com/x/log.txt?x=12386cb4600000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=700ca426ab83faae
> dashboard link: https://syzkaller.appspot.com/bug?extid=a7a6b9c609b9457c62c6
> compiler:       gcc (GCC) 9.0.0 20181231 (experimental)
> 
> Unfortunately, I don't have any reproducer for this crash yet.
> 
> IMPORTANT: if you fix the bug, please add the following tag to the commit:
> Reported-by: syzbot+a7a6b9c609b9457c62c6@syzkaller.appspotmail.com
> 
> ------------[ cut here ]------------
> usb 2-1: BOGUS urb xfer, pipe 2 != type 2
> WARNING: CPU: 0 PID: 3730 at drivers/usb/core/urb.c:477  
> usb_submit_urb+0x1188/0x13b0 drivers/usb/core/urb.c:477
> Kernel panic - not syncing: panic_on_warn set ...
> CPU: 0 PID: 3730 Comm: syz-executor.1 Not tainted 5.2.0-rc6+ #15
> 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+0xca/0x13e lib/dump_stack.c:113
>   panic+0x292/0x6c9 kernel/panic.c:219
>   __warn.cold+0x20/0x4b kernel/panic.c:576
>   report_bug+0x262/0x2a0 lib/bug.c:186
>   fixup_bug arch/x86/kernel/traps.c:179 [inline]
>   fixup_bug arch/x86/kernel/traps.c:174 [inline]
>   do_error_trap+0x12b/0x1e0 arch/x86/kernel/traps.c:272
>   do_invalid_op+0x32/0x40 arch/x86/kernel/traps.c:291
>   invalid_op+0x14/0x20 arch/x86/entry/entry_64.S:986
> RIP: 0010:usb_submit_urb+0x1188/0x13b0 drivers/usb/core/urb.c:477
> Code: 4d 85 ed 74 2c e8 f8 d3 f4 fd 4c 89 f7 e8 a0 51 1c ff 41 89 d8 44 89  
> e1 4c 89 ea 48 89 c6 48 c7 c7 00 0e f7 85 e8 83 98 ca fd <0f> 0b e9 20 f4  
> ff ff e8 cc d3 f4 fd 4c 89 f2 48 b8 00 00 00 00 00
> RSP: 0018:ffff8881d4f479d0 EFLAGS: 00010282
> RAX: 0000000000000000 RBX: 0000000000000002 RCX: 0000000000000000
> RDX: 0000000000005dfa RSI: ffffffff8127ef3d RDI: ffffed103a9e8f2c
> RBP: 0000000000000000 R08: ffff8881af663000 R09: 0000000000000000
> R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000002
> R13: ffff8881d462ed38 R14: ffff8881d18f9a20 R15: ffff8881d80e1c00
>   usb_start_wait_urb+0x108/0x2b0 drivers/usb/core/message.c:57
>   usb_internal_control_msg drivers/usb/core/message.c:101 [inline]
>   usb_control_msg+0x31c/0x4a0 drivers/usb/core/message.c:152
>   usbhid_set_raw_report drivers/hid/usbhid/hid-core.c:917 [inline]
>   usbhid_raw_request+0x21f/0x640 drivers/hid/usbhid/hid-core.c:1265
>   hid_hw_raw_request include/linux/hid.h:1079 [inline]
>   hidraw_send_report+0x296/0x500 drivers/hid/hidraw.c:151
>   hidraw_ioctl+0x5b4/0xaf0 drivers/hid/hidraw.c:421
>   vfs_ioctl fs/ioctl.c:46 [inline]
>   file_ioctl fs/ioctl.c:509 [inline]
>   do_vfs_ioctl+0xcda/0x12e0 fs/ioctl.c:696
>   ksys_ioctl+0x9b/0xc0 fs/ioctl.c:713
>   __do_sys_ioctl fs/ioctl.c:720 [inline]
>   __se_sys_ioctl fs/ioctl.c:718 [inline]
>   __x64_sys_ioctl+0x6f/0xb0 fs/ioctl.c:718
>   do_syscall_64+0xb7/0x560 arch/x86/entry/common.c:301
>   entry_SYSCALL_64_after_hwframe+0x49/0xbe

This is very strange.  It looks like the kernel is complaining that 2
!= 2.

A more likely explanation is a race in the usbhid driver.  If
usbhid_set_raw_report() gets called _after_ usbhid has been unbound
from the device and while the endpoint is being destroyed, we could get
something like this.

Perhaps one of Oliver's patches will also fix this.

Alan Stern

Re: WARNING in usbhid_raw_request/usb_submit_urb

[Andrey Konovalov]

On Tue, Jul 30, 2019 at 4:10 PM Alan Stern <stern@rowland.harvard.edu> wrote:
>
> On Mon, 29 Jul 2019, syzbot wrote:
>
> > Hello,
> >
> > syzbot found the following crash on:
> >
> > HEAD commit:    6a3599ce usb-fuzzer: main usb gadget fuzzer driver
> > git tree:       https://github.com/google/kasan.git usb-fuzzer
> > console output: https://syzkaller.appspot.com/x/log.txt?x=12386cb4600000
> > kernel config:  https://syzkaller.appspot.com/x/.config?x=700ca426ab83faae
> > dashboard link: https://syzkaller.appspot.com/bug?extid=a7a6b9c609b9457c62c6
> > compiler:       gcc (GCC) 9.0.0 20181231 (experimental)
> >
> > Unfortunately, I don't have any reproducer for this crash yet.
> >
> > IMPORTANT: if you fix the bug, please add the following tag to the commit:
> > Reported-by: syzbot+a7a6b9c609b9457c62c6@syzkaller.appspotmail.com
> >
> > ------------[ cut here ]------------
> > usb 2-1: BOGUS urb xfer, pipe 2 != type 2
> > WARNING: CPU: 0 PID: 3730 at drivers/usb/core/urb.c:477
> > usb_submit_urb+0x1188/0x13b0 drivers/usb/core/urb.c:477
> > Kernel panic - not syncing: panic_on_warn set ...
> > CPU: 0 PID: 3730 Comm: syz-executor.1 Not tainted 5.2.0-rc6+ #15
> > 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+0xca/0x13e lib/dump_stack.c:113
> >   panic+0x292/0x6c9 kernel/panic.c:219
> >   __warn.cold+0x20/0x4b kernel/panic.c:576
> >   report_bug+0x262/0x2a0 lib/bug.c:186
> >   fixup_bug arch/x86/kernel/traps.c:179 [inline]
> >   fixup_bug arch/x86/kernel/traps.c:174 [inline]
> >   do_error_trap+0x12b/0x1e0 arch/x86/kernel/traps.c:272
> >   do_invalid_op+0x32/0x40 arch/x86/kernel/traps.c:291
> >   invalid_op+0x14/0x20 arch/x86/entry/entry_64.S:986
> > RIP: 0010:usb_submit_urb+0x1188/0x13b0 drivers/usb/core/urb.c:477
> > Code: 4d 85 ed 74 2c e8 f8 d3 f4 fd 4c 89 f7 e8 a0 51 1c ff 41 89 d8 44 89
> > e1 4c 89 ea 48 89 c6 48 c7 c7 00 0e f7 85 e8 83 98 ca fd <0f> 0b e9 20 f4
> > ff ff e8 cc d3 f4 fd 4c 89 f2 48 b8 00 00 00 00 00
> > RSP: 0018:ffff8881d4f479d0 EFLAGS: 00010282
> > RAX: 0000000000000000 RBX: 0000000000000002 RCX: 0000000000000000
> > RDX: 0000000000005dfa RSI: ffffffff8127ef3d RDI: ffffed103a9e8f2c
> > RBP: 0000000000000000 R08: ffff8881af663000 R09: 0000000000000000
> > R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000002
> > R13: ffff8881d462ed38 R14: ffff8881d18f9a20 R15: ffff8881d80e1c00
> >   usb_start_wait_urb+0x108/0x2b0 drivers/usb/core/message.c:57
> >   usb_internal_control_msg drivers/usb/core/message.c:101 [inline]
> >   usb_control_msg+0x31c/0x4a0 drivers/usb/core/message.c:152
> >   usbhid_set_raw_report drivers/hid/usbhid/hid-core.c:917 [inline]
> >   usbhid_raw_request+0x21f/0x640 drivers/hid/usbhid/hid-core.c:1265
> >   hid_hw_raw_request include/linux/hid.h:1079 [inline]
> >   hidraw_send_report+0x296/0x500 drivers/hid/hidraw.c:151
> >   hidraw_ioctl+0x5b4/0xaf0 drivers/hid/hidraw.c:421
> >   vfs_ioctl fs/ioctl.c:46 [inline]
> >   file_ioctl fs/ioctl.c:509 [inline]
> >   do_vfs_ioctl+0xcda/0x12e0 fs/ioctl.c:696
> >   ksys_ioctl+0x9b/0xc0 fs/ioctl.c:713
> >   __do_sys_ioctl fs/ioctl.c:720 [inline]
> >   __se_sys_ioctl fs/ioctl.c:718 [inline]
> >   __x64_sys_ioctl+0x6f/0xb0 fs/ioctl.c:718
> >   do_syscall_64+0xb7/0x560 arch/x86/entry/common.c:301
> >   entry_SYSCALL_64_after_hwframe+0x49/0xbe
>
> This is very strange.  It looks like the kernel is complaining that 2
> != 2.
>
> A more likely explanation is a race in the usbhid driver.  If
> usbhid_set_raw_report() gets called _after_ usbhid has been unbound
> from the device and while the endpoint is being destroyed, we could get
> something like this.
>
> Perhaps one of Oliver's patches will also fix this.

Since there's no reproducer this is quite likely some kind of race. We
can close this bug once Oliver's patches are applied, and if it gets
triggered again syzbot will rereport it.

>
> Alan Stern
>

Re: WARNING in usbhid_raw_request/usb_submit_urb

[Oliver Neukum]

Am Dienstag, den 30.07.2019, 16:12 +0200 schrieb Andrey Konovalov:
> On Tue, Jul 30, 2019 at 4:10 PM Alan Stern <stern@rowland.harvard.edu> wrote:
> > 
> > On Mon, 29 Jul 2019, syzbot wrote:
> > 
> > > Hello,
> > > 
> > > syzbot found the following crash on:
> > > 
> > > HEAD commit:    6a3599ce usb-fuzzer: main usb gadget fuzzer driver
> > > git tree:       https://github.com/google/kasan.git usb-fuzzer
> > > console output: https://syzkaller.appspot.com/x/log.txt?x=12386cb4600000
> > > kernel config:  https://syzkaller.appspot.com/x/.config?x=700ca426ab83faae
> > > dashboard link: https://syzkaller.appspot.com/bug?extid=a7a6b9c609b9457c62c6
> > > compiler:       gcc (GCC) 9.0.0 20181231 (experimental)
> > > 
> > > Unfortunately, I don't have any reproducer for this crash yet.
> > > 
> > > IMPORTANT: if you fix the bug, please add the following tag to the commit:
> > > Reported-by: syzbot+a7a6b9c609b9457c62c6@syzkaller.appspotmail.com
> > > 
> > > ------------[ cut here ]------------
> > > usb 2-1: BOGUS urb xfer, pipe 2 != type 2
> > > WARNING: CPU: 0 PID: 3730 at drivers/usb/core/urb.c:477
> > > usb_submit_urb+0x1188/0x13b0 drivers/usb/core/urb.c:477
> > > Kernel panic - not syncing: panic_on_warn set ...
> > > CPU: 0 PID: 3730 Comm: syz-executor.1 Not tainted 5.2.0-rc6+ #15
> > > 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+0xca/0x13e lib/dump_stack.c:113
> > >   panic+0x292/0x6c9 kernel/panic.c:219
> > >   __warn.cold+0x20/0x4b kernel/panic.c:576
> > >   report_bug+0x262/0x2a0 lib/bug.c:186
> > >   fixup_bug arch/x86/kernel/traps.c:179 [inline]
> > >   fixup_bug arch/x86/kernel/traps.c:174 [inline]
> > >   do_error_trap+0x12b/0x1e0 arch/x86/kernel/traps.c:272
> > >   do_invalid_op+0x32/0x40 arch/x86/kernel/traps.c:291
> > >   invalid_op+0x14/0x20 arch/x86/entry/entry_64.S:986
> > > RIP: 0010:usb_submit_urb+0x1188/0x13b0 drivers/usb/core/urb.c:477
> > > Code: 4d 85 ed 74 2c e8 f8 d3 f4 fd 4c 89 f7 e8 a0 51 1c ff 41 89 d8 44 89
> > > e1 4c 89 ea 48 89 c6 48 c7 c7 00 0e f7 85 e8 83 98 ca fd <0f> 0b e9 20 f4
> > > ff ff e8 cc d3 f4 fd 4c 89 f2 48 b8 00 00 00 00 00
> > > RSP: 0018:ffff8881d4f479d0 EFLAGS: 00010282
> > > RAX: 0000000000000000 RBX: 0000000000000002 RCX: 0000000000000000
> > > RDX: 0000000000005dfa RSI: ffffffff8127ef3d RDI: ffffed103a9e8f2c
> > > RBP: 0000000000000000 R08: ffff8881af663000 R09: 0000000000000000
> > > R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000002
> > > R13: ffff8881d462ed38 R14: ffff8881d18f9a20 R15: ffff8881d80e1c00
> > >   usb_start_wait_urb+0x108/0x2b0 drivers/usb/core/message.c:57
> > >   usb_internal_control_msg drivers/usb/core/message.c:101 [inline]
> > >   usb_control_msg+0x31c/0x4a0 drivers/usb/core/message.c:152
> > >   usbhid_set_raw_report drivers/hid/usbhid/hid-core.c:917 [inline]
> > >   usbhid_raw_request+0x21f/0x640 drivers/hid/usbhid/hid-core.c:1265
> > >   hid_hw_raw_request include/linux/hid.h:1079 [inline]
> > >   hidraw_send_report+0x296/0x500 drivers/hid/hidraw.c:151
> > >   hidraw_ioctl+0x5b4/0xaf0 drivers/hid/hidraw.c:421
> > >   vfs_ioctl fs/ioctl.c:46 [inline]
> > >   file_ioctl fs/ioctl.c:509 [inline]
> > >   do_vfs_ioctl+0xcda/0x12e0 fs/ioctl.c:696
> > >   ksys_ioctl+0x9b/0xc0 fs/ioctl.c:713
> > >   __do_sys_ioctl fs/ioctl.c:720 [inline]
> > >   __se_sys_ioctl fs/ioctl.c:718 [inline]
> > >   __x64_sys_ioctl+0x6f/0xb0 fs/ioctl.c:718
> > >   do_syscall_64+0xb7/0x560 arch/x86/entry/common.c:301
> > >   entry_SYSCALL_64_after_hwframe+0x49/0xbe
> > 
> > This is very strange.  It looks like the kernel is complaining that 2
> > != 2.
> > 
> > A more likely explanation is a race in the usbhid driver.  If
> > usbhid_set_raw_report() gets called _after_ usbhid has been unbound
> > from the device and while the endpoint is being destroyed, we could get
> > something like this.
> > 
> > Perhaps one of Oliver's patches will also fix this.
> 
> Since there's no reproducer this is quite likely some kind of race. We
> can close this bug once Oliver's patches are applied, and if it gets
> triggered again syzbot will rereport it.

AFAICT my patch right now introduces another race. This will require
a fresh look.

	Regards
		Oliver

Re: WARNING in usbhid_raw_request/usb_submit_urb

[syzbot]

syzbot has found a reproducer for the following crash on:

HEAD commit:    7f7867ff usb-fuzzer: main usb gadget fuzzer driver
git tree:       https://github.com/google/kasan.git usb-fuzzer
console output: https://syzkaller.appspot.com/x/log.txt?x=10619cec600000
kernel config:  https://syzkaller.appspot.com/x/.config?x=792eb47789f57810
dashboard link: https://syzkaller.appspot.com/bug?extid=a7a6b9c609b9457c62c6
compiler:       gcc (GCC) 9.0.0 20181231 (experimental)
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=10606c42600000

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+a7a6b9c609b9457c62c6@syzkaller.appspotmail.com

------------[ cut here ]------------
usb 2-1: BOGUS urb xfer, pipe 2 != type 2
WARNING: CPU: 1 PID: 7429 at drivers/usb/core/urb.c:477  
usb_submit_urb+0x1188/0x13b0 drivers/usb/core/urb.c:477
Kernel panic - not syncing: panic_on_warn set ...
CPU: 1 PID: 7429 Comm: syz-executor.1 Not tainted 5.3.0-rc2+ #23
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+0xca/0x13e lib/dump_stack.c:113
  panic+0x2a3/0x6da kernel/panic.c:219
  __warn.cold+0x20/0x4a kernel/panic.c:576
  report_bug+0x262/0x2a0 lib/bug.c:186
  fixup_bug arch/x86/kernel/traps.c:179 [inline]
  fixup_bug arch/x86/kernel/traps.c:174 [inline]
  do_error_trap+0x12b/0x1e0 arch/x86/kernel/traps.c:272
  do_invalid_op+0x32/0x40 arch/x86/kernel/traps.c:291
  invalid_op+0x23/0x30 arch/x86/entry/entry_64.S:1026
RIP: 0010:usb_submit_urb+0x1188/0x13b0 drivers/usb/core/urb.c:477
Code: 4d 85 ed 74 2c e8 38 e8 ed fd 4c 89 f7 e8 70 dc 1a ff 41 89 d8 44 89  
e1 4c 89 ea 48 89 c6 48 c7 c7 60 cc f8 85 e8 4d b9 c3 fd <0f> 0b e9 20 f4  
ff ff e8 0c e8 ed fd 4c 89 f2 48 b8 00 00 00 00 00
RSP: 0018:ffff8881cef0f9d0 EFLAGS: 00010282
RAX: 0000000000000000 RBX: 0000000000000002 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff812830fd RDI: ffffed1039de1f2c
RBP: 0000000000000000 R08: ffff8881c853e000 R09: fffffbfff115e1a2
R10: fffffbfff115e1a1 R11: ffffffff88af0d0f R12: 0000000000000002
R13: ffff8881d976b0a8 R14: ffff8881d0e02b20 R15: ffff8881d1720600
  usb_start_wait_urb+0x108/0x2b0 drivers/usb/core/message.c:57
  usb_internal_control_msg drivers/usb/core/message.c:101 [inline]
  usb_control_msg+0x31c/0x4a0 drivers/usb/core/message.c:152
  usbhid_set_raw_report drivers/hid/usbhid/hid-core.c:917 [inline]
  usbhid_raw_request+0x21f/0x640 drivers/hid/usbhid/hid-core.c:1265
  hid_hw_raw_request include/linux/hid.h:1079 [inline]
  hidraw_send_report+0x296/0x500 drivers/hid/hidraw.c:151
  hidraw_ioctl+0x5b4/0xae0 drivers/hid/hidraw.c:421
  vfs_ioctl fs/ioctl.c:46 [inline]
  file_ioctl fs/ioctl.c:509 [inline]
  do_vfs_ioctl+0xd2d/0x1330 fs/ioctl.c:696
  ksys_ioctl+0x9b/0xc0 fs/ioctl.c:713
  __do_sys_ioctl fs/ioctl.c:720 [inline]
  __se_sys_ioctl fs/ioctl.c:718 [inline]
  __x64_sys_ioctl+0x6f/0xb0 fs/ioctl.c:718
  do_syscall_64+0xb7/0x580 arch/x86/entry/common.c:296
  entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x459829
Code: fd b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7  
48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff  
ff 0f 83 cb b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f6a91f44c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000459829
RDX: 0000000020000240 RSI: 00000000c0404806 RDI: 0000000000000004
RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f6a91f456d4
R13: 00000000004c22c3 R14: 00000000004d5688 R15: 00000000ffffffff
Kernel Offset: disabled
Rebooting in 86400 seconds..

Re: WARNING in usbhid_raw_request/usb_submit_urb

[Andrey Konovalov]

[-- Attachment #1: Type: text/plain, Size: 4091 bytes --]

On Tue, Jul 30, 2019 at 6:58 PM syzbot
<syzbot+a7a6b9c609b9457c62c6@syzkaller.appspotmail.com> wrote:
>
> syzbot has found a reproducer for the following crash on:
>
> HEAD commit:    7f7867ff usb-fuzzer: main usb gadget fuzzer driver
> git tree:       https://github.com/google/kasan.git usb-fuzzer
> console output: https://syzkaller.appspot.com/x/log.txt?x=10619cec600000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=792eb47789f57810
> dashboard link: https://syzkaller.appspot.com/bug?extid=a7a6b9c609b9457c62c6
> compiler:       gcc (GCC) 9.0.0 20181231 (experimental)
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=10606c42600000
>
> IMPORTANT: if you fix the bug, please add the following tag to the commit:
> Reported-by: syzbot+a7a6b9c609b9457c62c6@syzkaller.appspotmail.com

Let's try Hillf's patch here as well:

#syz test: https://github.com/google/kasan.git 7f7867ff

>
> ------------[ cut here ]------------
> usb 2-1: BOGUS urb xfer, pipe 2 != type 2
> WARNING: CPU: 1 PID: 7429 at drivers/usb/core/urb.c:477
> usb_submit_urb+0x1188/0x13b0 drivers/usb/core/urb.c:477
> Kernel panic - not syncing: panic_on_warn set ...
> CPU: 1 PID: 7429 Comm: syz-executor.1 Not tainted 5.3.0-rc2+ #23
> 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+0xca/0x13e lib/dump_stack.c:113
>   panic+0x2a3/0x6da kernel/panic.c:219
>   __warn.cold+0x20/0x4a kernel/panic.c:576
>   report_bug+0x262/0x2a0 lib/bug.c:186
>   fixup_bug arch/x86/kernel/traps.c:179 [inline]
>   fixup_bug arch/x86/kernel/traps.c:174 [inline]
>   do_error_trap+0x12b/0x1e0 arch/x86/kernel/traps.c:272
>   do_invalid_op+0x32/0x40 arch/x86/kernel/traps.c:291
>   invalid_op+0x23/0x30 arch/x86/entry/entry_64.S:1026
> RIP: 0010:usb_submit_urb+0x1188/0x13b0 drivers/usb/core/urb.c:477
> Code: 4d 85 ed 74 2c e8 38 e8 ed fd 4c 89 f7 e8 70 dc 1a ff 41 89 d8 44 89
> e1 4c 89 ea 48 89 c6 48 c7 c7 60 cc f8 85 e8 4d b9 c3 fd <0f> 0b e9 20 f4
> ff ff e8 0c e8 ed fd 4c 89 f2 48 b8 00 00 00 00 00
> RSP: 0018:ffff8881cef0f9d0 EFLAGS: 00010282
> RAX: 0000000000000000 RBX: 0000000000000002 RCX: 0000000000000000
> RDX: 0000000000000000 RSI: ffffffff812830fd RDI: ffffed1039de1f2c
> RBP: 0000000000000000 R08: ffff8881c853e000 R09: fffffbfff115e1a2
> R10: fffffbfff115e1a1 R11: ffffffff88af0d0f R12: 0000000000000002
> R13: ffff8881d976b0a8 R14: ffff8881d0e02b20 R15: ffff8881d1720600
>   usb_start_wait_urb+0x108/0x2b0 drivers/usb/core/message.c:57
>   usb_internal_control_msg drivers/usb/core/message.c:101 [inline]
>   usb_control_msg+0x31c/0x4a0 drivers/usb/core/message.c:152
>   usbhid_set_raw_report drivers/hid/usbhid/hid-core.c:917 [inline]
>   usbhid_raw_request+0x21f/0x640 drivers/hid/usbhid/hid-core.c:1265
>   hid_hw_raw_request include/linux/hid.h:1079 [inline]
>   hidraw_send_report+0x296/0x500 drivers/hid/hidraw.c:151
>   hidraw_ioctl+0x5b4/0xae0 drivers/hid/hidraw.c:421
>   vfs_ioctl fs/ioctl.c:46 [inline]
>   file_ioctl fs/ioctl.c:509 [inline]
>   do_vfs_ioctl+0xd2d/0x1330 fs/ioctl.c:696
>   ksys_ioctl+0x9b/0xc0 fs/ioctl.c:713
>   __do_sys_ioctl fs/ioctl.c:720 [inline]
>   __se_sys_ioctl fs/ioctl.c:718 [inline]
>   __x64_sys_ioctl+0x6f/0xb0 fs/ioctl.c:718
>   do_syscall_64+0xb7/0x580 arch/x86/entry/common.c:296
>   entry_SYSCALL_64_after_hwframe+0x49/0xbe
> RIP: 0033:0x459829
> Code: fd b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7
> 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff
> ff 0f 83 cb b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00
> RSP: 002b:00007f6a91f44c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
> RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000459829
> RDX: 0000000020000240 RSI: 00000000c0404806 RDI: 0000000000000004
> RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000
> R10: 0000000000000000 R11: 0000000000000246 R12: 00007f6a91f456d4
> R13: 00000000004c22c3 R14: 00000000004d5688 R15: 00000000ffffffff
> Kernel Offset: disabled
> Rebooting in 86400 seconds..
>

[-- Attachment #2: hid-core.patch --]
[-- Type: text/x-patch, Size: 351 bytes --]

--- a/drivers/hid/usbhid/hid-core.c
+++ b/drivers/hid/usbhid/hid-core.c
@@ -1410,6 +1410,7 @@ static void usbhid_disconnect(struct usb
 	spin_lock_irq(&usbhid->lock);	/* Sync with error and led handlers */
 	set_bit(HID_DISCONNECTED, &usbhid->iofl);
 	spin_unlock_irq(&usbhid->lock);
+	hid_hw_stop(hid);
 	hid_destroy_device(hid);
 	kfree(usbhid);
 }

Re: WARNING in usbhid_raw_request/usb_submit_urb

[syzbot]

Hello,

syzbot has tested the proposed patch but the reproducer still triggered  
crash:
KASAN: invalid-free in hcd_buffer_free

usb 5-1: USB disconnect, device number 2
==================================================================
BUG: KASAN: double-free or invalid-free in hcd_buffer_free+0x199/0x260  
drivers/usb/core/buffer.c:165

CPU: 0 PID: 1745 Comm: kworker/0:2 Not tainted 5.3.0-rc2+ #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
  print_address_description+0x6a/0x32c mm/kasan/report.c:351
  kasan_report_invalid_free+0x61/0xa0 mm/kasan/report.c:444
  __kasan_slab_free+0x162/0x180 mm/kasan/common.c:428
  slab_free_hook mm/slub.c:1423 [inline]
  slab_free_freelist_hook mm/slub.c:1470 [inline]
  slab_free mm/slub.c:3012 [inline]
  kfree+0xe4/0x2f0 mm/slub.c:3953
  hcd_buffer_free+0x199/0x260 drivers/usb/core/buffer.c:165
  usb_free_coherent+0x67/0x80 drivers/usb/core/usb.c:932
  hid_free_buffers.isra.0+0x94/0x290 drivers/hid/usbhid/hid-core.c:964
  usbhid_stop+0x308/0x450 drivers/hid/usbhid/hid-core.c:1224
  logi_dj_remove+0x107/0x210 drivers/hid/hid-logitech-dj.c:1797
  hid_device_remove+0xed/0x240 drivers/hid/hid-core.c:2242
  __device_release_driver drivers/base/dd.c:1118 [inline]
  device_release_driver_internal+0x206/0x4c0 drivers/base/dd.c:1151
  bus_remove_device+0x2dc/0x4a0 drivers/base/bus.c:556
  device_del+0x420/0xb10 drivers/base/core.c:2288
  hid_remove_device drivers/hid/hid-core.c:2413 [inline]
  hid_destroy_device+0xe1/0x150 drivers/hid/hid-core.c:2432
  usbhid_disconnect+0xad/0xd0 drivers/hid/usbhid/hid-core.c:1414
  usb_unbind_interface+0x1bd/0x8a0 drivers/usb/core/driver.c:423
  __device_release_driver drivers/base/dd.c:1120 [inline]
  device_release_driver_internal+0x404/0x4c0 drivers/base/dd.c:1151
  bus_remove_device+0x2dc/0x4a0 drivers/base/bus.c:556
  device_del+0x420/0xb10 drivers/base/core.c:2288
  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
  process_scheduled_works kernel/workqueue.c:2331 [inline]
  worker_thread+0x7ab/0xe20 kernel/workqueue.c:2417
  kthread+0x318/0x420 kernel/kthread.c:255
  ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352

Allocated by task 1745:
  save_stack+0x1b/0x80 mm/kasan/common.c:69
  set_track mm/kasan/common.c:77 [inline]
  __kasan_kmalloc mm/kasan/common.c:487 [inline]
  __kasan_kmalloc.constprop.0+0xbf/0xd0 mm/kasan/common.c:460
  kmalloc include/linux/slab.h:557 [inline]
  hcd_buffer_alloc+0x1ca/0x290 drivers/usb/core/buffer.c:135
  usb_alloc_coherent+0x5d/0x80 drivers/usb/core/usb.c:910
  hid_alloc_buffers drivers/hid/usbhid/hid-core.c:846 [inline]
  usbhid_start+0x60b/0x22f0 drivers/hid/usbhid/hid-core.c:1075
  hid_hw_start+0x5d/0x130 drivers/hid/hid-core.c:1976
  logi_dj_probe+0x808/0xcd7 drivers/hid/hid-logitech-dj.c:1703
  hid_device_probe+0x2be/0x3f0 drivers/hid/hid-core.c:2209
  really_probe+0x281/0x650 drivers/base/dd.c:548
  driver_probe_device+0x101/0x1b0 drivers/base/dd.c:709
  __device_attach_driver+0x1c2/0x220 drivers/base/dd.c:816
  bus_for_each_drv+0x15c/0x1e0 drivers/base/bus.c:454
  __device_attach+0x217/0x360 drivers/base/dd.c:882
  bus_probe_device+0x1e4/0x290 drivers/base/bus.c:514
  device_add+0xae6/0x16f0 drivers/base/core.c:2114
  hid_add_device+0x33c/0x990 drivers/hid/hid-core.c:2365
  usbhid_probe+0xa81/0xfa0 drivers/hid/usbhid/hid-core.c:1386
  usb_probe_interface+0x305/0x7a0 drivers/usb/core/driver.c:361
  really_probe+0x281/0x650 drivers/base/dd.c:548
  driver_probe_device+0x101/0x1b0 drivers/base/dd.c:709
  __device_attach_driver+0x1c2/0x220 drivers/base/dd.c:816
  bus_for_each_drv+0x15c/0x1e0 drivers/base/bus.c:454
  __device_attach+0x217/0x360 drivers/base/dd.c:882
  bus_probe_device+0x1e4/0x290 drivers/base/bus.c:514
  device_add+0xae6/0x16f0 drivers/base/core.c:2114
  usb_set_configuration+0xdf6/0x1670 drivers/usb/core/message.c:2023
  generic_probe+0x9d/0xd5 drivers/usb/core/generic.c:210
  usb_probe_device+0x99/0x100 drivers/usb/core/driver.c:266
  really_probe+0x281/0x650 drivers/base/dd.c:548
  driver_probe_device+0x101/0x1b0 drivers/base/dd.c:709
  __device_attach_driver+0x1c2/0x220 drivers/base/dd.c:816
  bus_for_each_drv+0x15c/0x1e0 drivers/base/bus.c:454
  __device_attach+0x217/0x360 drivers/base/dd.c:882
  bus_probe_device+0x1e4/0x290 drivers/base/bus.c:514
  device_add+0xae6/0x16f0 drivers/base/core.c:2114
  usb_new_device.cold+0x6a4/0xe79 drivers/usb/core/hub.c:2536
  hub_port_connect drivers/usb/core/hub.c:5098 [inline]
  hub_port_connect_change drivers/usb/core/hub.c:5213 [inline]
  port_event drivers/usb/core/hub.c:5359 [inline]
  hub_event+0x1b5c/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

Freed by task 1745:
  save_stack+0x1b/0x80 mm/kasan/common.c:69
  set_track mm/kasan/common.c:77 [inline]
  __kasan_slab_free+0x130/0x180 mm/kasan/common.c:449
  slab_free_hook mm/slub.c:1423 [inline]
  slab_free_freelist_hook mm/slub.c:1470 [inline]
  slab_free mm/slub.c:3012 [inline]
  kfree+0xe4/0x2f0 mm/slub.c:3953
  hcd_buffer_free+0x199/0x260 drivers/usb/core/buffer.c:165
  usb_free_coherent+0x67/0x80 drivers/usb/core/usb.c:932
  hid_free_buffers.isra.0+0x94/0x290 drivers/hid/usbhid/hid-core.c:964
  usbhid_stop+0x308/0x450 drivers/hid/usbhid/hid-core.c:1224
  usbhid_disconnect+0xa5/0xd0 drivers/hid/usbhid/hid-core.c:1413
  usb_unbind_interface+0x1bd/0x8a0 drivers/usb/core/driver.c:423
  __device_release_driver drivers/base/dd.c:1120 [inline]
  device_release_driver_internal+0x404/0x4c0 drivers/base/dd.c:1151
  bus_remove_device+0x2dc/0x4a0 drivers/base/bus.c:556
  device_del+0x420/0xb10 drivers/base/core.c:2288
  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
  process_scheduled_works kernel/workqueue.c:2331 [inline]
  worker_thread+0x7ab/0xe20 kernel/workqueue.c:2417
  kthread+0x318/0x420 kernel/kthread.c:255
  ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352

The buggy address belongs to the object at ffff8881d5875500
  which belongs to the cache kmalloc-4k of size 4096
The buggy address is located 0 bytes inside of
  4096-byte region [ffff8881d5875500, ffff8881d5876500)
The buggy address belongs to the page:
page:ffffea0007561c00 refcount:1 mapcount:0 mapping:ffff8881da00c280  
index:0x0 compound_mapcount: 0
flags: 0x200000000010200(slab|head)
raw: 0200000000010200 dead000000000100 dead000000000122 ffff8881da00c280
raw: 0000000000000000 0000000000070007 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
  ffff8881d5875400: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
  ffff8881d5875480: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
> ffff8881d5875500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                    ^
  ffff8881d5875580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
  ffff8881d5875600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================


Tested on:

commit:         7f7867ff 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=13833b9a600000
kernel config:  https://syzkaller.appspot.com/x/.config?x=792eb47789f57810
compiler:       gcc (GCC) 9.0.0 20181231 (experimental)
patch:          https://syzkaller.appspot.com/x/patch.diff?x=167d2a0e600000

Re: WARNING in usbhid_raw_request/usb_submit_urb

[Andrey Konovalov]

On Mon, Aug 12, 2019 at 3:03 PM syzbot
<syzbot+a7a6b9c609b9457c62c6@syzkaller.appspotmail.com> wrote:
>
> Hello,
>
> syzbot has tested the proposed patch but the reproducer still triggered
> crash:
> KASAN: invalid-free in hcd_buffer_free
>
> usb 5-1: USB disconnect, device number 2
> ==================================================================
> BUG: KASAN: double-free or invalid-free in hcd_buffer_free+0x199/0x260
> drivers/usb/core/buffer.c:165

Hm, looks like a different bug...

>
> CPU: 0 PID: 1745 Comm: kworker/0:2 Not tainted 5.3.0-rc2+ #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
>   print_address_description+0x6a/0x32c mm/kasan/report.c:351
>   kasan_report_invalid_free+0x61/0xa0 mm/kasan/report.c:444
>   __kasan_slab_free+0x162/0x180 mm/kasan/common.c:428
>   slab_free_hook mm/slub.c:1423 [inline]
>   slab_free_freelist_hook mm/slub.c:1470 [inline]
>   slab_free mm/slub.c:3012 [inline]
>   kfree+0xe4/0x2f0 mm/slub.c:3953
>   hcd_buffer_free+0x199/0x260 drivers/usb/core/buffer.c:165
>   usb_free_coherent+0x67/0x80 drivers/usb/core/usb.c:932
>   hid_free_buffers.isra.0+0x94/0x290 drivers/hid/usbhid/hid-core.c:964
>   usbhid_stop+0x308/0x450 drivers/hid/usbhid/hid-core.c:1224
>   logi_dj_remove+0x107/0x210 drivers/hid/hid-logitech-dj.c:1797
>   hid_device_remove+0xed/0x240 drivers/hid/hid-core.c:2242
>   __device_release_driver drivers/base/dd.c:1118 [inline]
>   device_release_driver_internal+0x206/0x4c0 drivers/base/dd.c:1151
>   bus_remove_device+0x2dc/0x4a0 drivers/base/bus.c:556
>   device_del+0x420/0xb10 drivers/base/core.c:2288
>   hid_remove_device drivers/hid/hid-core.c:2413 [inline]
>   hid_destroy_device+0xe1/0x150 drivers/hid/hid-core.c:2432
>   usbhid_disconnect+0xad/0xd0 drivers/hid/usbhid/hid-core.c:1414
>   usb_unbind_interface+0x1bd/0x8a0 drivers/usb/core/driver.c:423
>   __device_release_driver drivers/base/dd.c:1120 [inline]
>   device_release_driver_internal+0x404/0x4c0 drivers/base/dd.c:1151
>   bus_remove_device+0x2dc/0x4a0 drivers/base/bus.c:556
>   device_del+0x420/0xb10 drivers/base/core.c:2288
>   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
>   process_scheduled_works kernel/workqueue.c:2331 [inline]
>   worker_thread+0x7ab/0xe20 kernel/workqueue.c:2417
>   kthread+0x318/0x420 kernel/kthread.c:255
>   ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352
>
> Allocated by task 1745:
>   save_stack+0x1b/0x80 mm/kasan/common.c:69
>   set_track mm/kasan/common.c:77 [inline]
>   __kasan_kmalloc mm/kasan/common.c:487 [inline]
>   __kasan_kmalloc.constprop.0+0xbf/0xd0 mm/kasan/common.c:460
>   kmalloc include/linux/slab.h:557 [inline]
>   hcd_buffer_alloc+0x1ca/0x290 drivers/usb/core/buffer.c:135
>   usb_alloc_coherent+0x5d/0x80 drivers/usb/core/usb.c:910
>   hid_alloc_buffers drivers/hid/usbhid/hid-core.c:846 [inline]
>   usbhid_start+0x60b/0x22f0 drivers/hid/usbhid/hid-core.c:1075
>   hid_hw_start+0x5d/0x130 drivers/hid/hid-core.c:1976
>   logi_dj_probe+0x808/0xcd7 drivers/hid/hid-logitech-dj.c:1703
>   hid_device_probe+0x2be/0x3f0 drivers/hid/hid-core.c:2209
>   really_probe+0x281/0x650 drivers/base/dd.c:548
>   driver_probe_device+0x101/0x1b0 drivers/base/dd.c:709
>   __device_attach_driver+0x1c2/0x220 drivers/base/dd.c:816
>   bus_for_each_drv+0x15c/0x1e0 drivers/base/bus.c:454
>   __device_attach+0x217/0x360 drivers/base/dd.c:882
>   bus_probe_device+0x1e4/0x290 drivers/base/bus.c:514
>   device_add+0xae6/0x16f0 drivers/base/core.c:2114
>   hid_add_device+0x33c/0x990 drivers/hid/hid-core.c:2365
>   usbhid_probe+0xa81/0xfa0 drivers/hid/usbhid/hid-core.c:1386
>   usb_probe_interface+0x305/0x7a0 drivers/usb/core/driver.c:361
>   really_probe+0x281/0x650 drivers/base/dd.c:548
>   driver_probe_device+0x101/0x1b0 drivers/base/dd.c:709
>   __device_attach_driver+0x1c2/0x220 drivers/base/dd.c:816
>   bus_for_each_drv+0x15c/0x1e0 drivers/base/bus.c:454
>   __device_attach+0x217/0x360 drivers/base/dd.c:882
>   bus_probe_device+0x1e4/0x290 drivers/base/bus.c:514
>   device_add+0xae6/0x16f0 drivers/base/core.c:2114
>   usb_set_configuration+0xdf6/0x1670 drivers/usb/core/message.c:2023
>   generic_probe+0x9d/0xd5 drivers/usb/core/generic.c:210
>   usb_probe_device+0x99/0x100 drivers/usb/core/driver.c:266
>   really_probe+0x281/0x650 drivers/base/dd.c:548
>   driver_probe_device+0x101/0x1b0 drivers/base/dd.c:709
>   __device_attach_driver+0x1c2/0x220 drivers/base/dd.c:816
>   bus_for_each_drv+0x15c/0x1e0 drivers/base/bus.c:454
>   __device_attach+0x217/0x360 drivers/base/dd.c:882
>   bus_probe_device+0x1e4/0x290 drivers/base/bus.c:514
>   device_add+0xae6/0x16f0 drivers/base/core.c:2114
>   usb_new_device.cold+0x6a4/0xe79 drivers/usb/core/hub.c:2536
>   hub_port_connect drivers/usb/core/hub.c:5098 [inline]
>   hub_port_connect_change drivers/usb/core/hub.c:5213 [inline]
>   port_event drivers/usb/core/hub.c:5359 [inline]
>   hub_event+0x1b5c/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
>
> Freed by task 1745:
>   save_stack+0x1b/0x80 mm/kasan/common.c:69
>   set_track mm/kasan/common.c:77 [inline]
>   __kasan_slab_free+0x130/0x180 mm/kasan/common.c:449
>   slab_free_hook mm/slub.c:1423 [inline]
>   slab_free_freelist_hook mm/slub.c:1470 [inline]
>   slab_free mm/slub.c:3012 [inline]
>   kfree+0xe4/0x2f0 mm/slub.c:3953
>   hcd_buffer_free+0x199/0x260 drivers/usb/core/buffer.c:165
>   usb_free_coherent+0x67/0x80 drivers/usb/core/usb.c:932
>   hid_free_buffers.isra.0+0x94/0x290 drivers/hid/usbhid/hid-core.c:964
>   usbhid_stop+0x308/0x450 drivers/hid/usbhid/hid-core.c:1224
>   usbhid_disconnect+0xa5/0xd0 drivers/hid/usbhid/hid-core.c:1413
>   usb_unbind_interface+0x1bd/0x8a0 drivers/usb/core/driver.c:423
>   __device_release_driver drivers/base/dd.c:1120 [inline]
>   device_release_driver_internal+0x404/0x4c0 drivers/base/dd.c:1151
>   bus_remove_device+0x2dc/0x4a0 drivers/base/bus.c:556
>   device_del+0x420/0xb10 drivers/base/core.c:2288
>   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
>   process_scheduled_works kernel/workqueue.c:2331 [inline]
>   worker_thread+0x7ab/0xe20 kernel/workqueue.c:2417
>   kthread+0x318/0x420 kernel/kthread.c:255
>   ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352
>
> The buggy address belongs to the object at ffff8881d5875500
>   which belongs to the cache kmalloc-4k of size 4096
> The buggy address is located 0 bytes inside of
>   4096-byte region [ffff8881d5875500, ffff8881d5876500)
> The buggy address belongs to the page:
> page:ffffea0007561c00 refcount:1 mapcount:0 mapping:ffff8881da00c280
> index:0x0 compound_mapcount: 0
> flags: 0x200000000010200(slab|head)
> raw: 0200000000010200 dead000000000100 dead000000000122 ffff8881da00c280
> raw: 0000000000000000 0000000000070007 00000001ffffffff 0000000000000000
> page dumped because: kasan: bad access detected
>
> Memory state around the buggy address:
>   ffff8881d5875400: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>   ffff8881d5875480: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
> > ffff8881d5875500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>                     ^
>   ffff8881d5875580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>   ffff8881d5875600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
> ==================================================================
>
>
> Tested on:
>
> commit:         7f7867ff 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=13833b9a600000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=792eb47789f57810
> compiler:       gcc (GCC) 9.0.0 20181231 (experimental)
> patch:          https://syzkaller.appspot.com/x/patch.diff?x=167d2a0e600000
>

Re: WARNING in usbhid_raw_request/usb_submit_urb

[Alan Stern]

On Mon, 12 Aug 2019, syzbot wrote:

> Hello,
> 
> syzbot has tested the proposed patch but the reproducer still triggered  
> crash:
> KASAN: invalid-free in hcd_buffer_free

This bug report shows that Hillf's fix isn't exactly right.

> usb 5-1: USB disconnect, device number 2
> ==================================================================
> BUG: KASAN: double-free or invalid-free in hcd_buffer_free+0x199/0x260  
> drivers/usb/core/buffer.c:165
> 
> CPU: 0 PID: 1745 Comm: kworker/0:2 Not tainted 5.3.0-rc2+ #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
>   print_address_description+0x6a/0x32c mm/kasan/report.c:351
>   kasan_report_invalid_free+0x61/0xa0 mm/kasan/report.c:444
>   __kasan_slab_free+0x162/0x180 mm/kasan/common.c:428
>   slab_free_hook mm/slub.c:1423 [inline]
>   slab_free_freelist_hook mm/slub.c:1470 [inline]
>   slab_free mm/slub.c:3012 [inline]
>   kfree+0xe4/0x2f0 mm/slub.c:3953
>   hcd_buffer_free+0x199/0x260 drivers/usb/core/buffer.c:165
>   usb_free_coherent+0x67/0x80 drivers/usb/core/usb.c:932
>   hid_free_buffers.isra.0+0x94/0x290 drivers/hid/usbhid/hid-core.c:964
>   usbhid_stop+0x308/0x450 drivers/hid/usbhid/hid-core.c:1224
>   logi_dj_remove+0x107/0x210 drivers/hid/hid-logitech-dj.c:1797

Here the double-free occurred when logi_dj_remove() called 
hd_hw_stop()...

>   hid_device_remove+0xed/0x240 drivers/hid/hid-core.c:2242
>   __device_release_driver drivers/base/dd.c:1118 [inline]
>   device_release_driver_internal+0x206/0x4c0 drivers/base/dd.c:1151
>   bus_remove_device+0x2dc/0x4a0 drivers/base/bus.c:556
>   device_del+0x420/0xb10 drivers/base/core.c:2288
>   hid_remove_device drivers/hid/hid-core.c:2413 [inline]
>   hid_destroy_device+0xe1/0x150 drivers/hid/hid-core.c:2432
>   usbhid_disconnect+0xad/0xd0 drivers/hid/usbhid/hid-core.c:1414

which occurred inside usbhid_disconnect()'s call to
hid_destroy_device().

But just above the call to hid_destroy_device(), Hillf's patch adds a 
direct call to hid_hw_stop(), which is what did the original free.

So it looks like the problem here is that some paths in the original
unpatched code end up calling hid_hw_stop() by way of the hid_device's
driver, and other paths do not.

I haven't had time to track down this difference.  Maybe somebody 
on the mailing list already knows why it occurs.

Alan Stern

Re: WARNING in usbhid_raw_request/usb_submit_urb

[Andrey Konovalov]

[-- Attachment #1: Type: text/plain, Size: 2782 bytes --]

On Tue, Aug 13, 2019 at 10:13 PM Alan Stern <stern@rowland.harvard.edu> wrote:
>
> On Mon, 12 Aug 2019, syzbot wrote:
>
> > Hello,
> >
> > syzbot has tested the proposed patch but the reproducer still triggered
> > crash:
> > KASAN: invalid-free in hcd_buffer_free
>
> This bug report shows that Hillf's fix isn't exactly right.
>
> > usb 5-1: USB disconnect, device number 2
> > ==================================================================
> > BUG: KASAN: double-free or invalid-free in hcd_buffer_free+0x199/0x260
> > drivers/usb/core/buffer.c:165
> >
> > CPU: 0 PID: 1745 Comm: kworker/0:2 Not tainted 5.3.0-rc2+ #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
> >   print_address_description+0x6a/0x32c mm/kasan/report.c:351
> >   kasan_report_invalid_free+0x61/0xa0 mm/kasan/report.c:444
> >   __kasan_slab_free+0x162/0x180 mm/kasan/common.c:428
> >   slab_free_hook mm/slub.c:1423 [inline]
> >   slab_free_freelist_hook mm/slub.c:1470 [inline]
> >   slab_free mm/slub.c:3012 [inline]
> >   kfree+0xe4/0x2f0 mm/slub.c:3953
> >   hcd_buffer_free+0x199/0x260 drivers/usb/core/buffer.c:165
> >   usb_free_coherent+0x67/0x80 drivers/usb/core/usb.c:932
> >   hid_free_buffers.isra.0+0x94/0x290 drivers/hid/usbhid/hid-core.c:964
> >   usbhid_stop+0x308/0x450 drivers/hid/usbhid/hid-core.c:1224
> >   logi_dj_remove+0x107/0x210 drivers/hid/hid-logitech-dj.c:1797
>
> Here the double-free occurred when logi_dj_remove() called
> hd_hw_stop()...
>
> >   hid_device_remove+0xed/0x240 drivers/hid/hid-core.c:2242
> >   __device_release_driver drivers/base/dd.c:1118 [inline]
> >   device_release_driver_internal+0x206/0x4c0 drivers/base/dd.c:1151
> >   bus_remove_device+0x2dc/0x4a0 drivers/base/bus.c:556
> >   device_del+0x420/0xb10 drivers/base/core.c:2288
> >   hid_remove_device drivers/hid/hid-core.c:2413 [inline]
> >   hid_destroy_device+0xe1/0x150 drivers/hid/hid-core.c:2432
> >   usbhid_disconnect+0xad/0xd0 drivers/hid/usbhid/hid-core.c:1414
>
> which occurred inside usbhid_disconnect()'s call to
> hid_destroy_device().
>
> But just above the call to hid_destroy_device(), Hillf's patch adds a
> direct call to hid_hw_stop(), which is what did the original free.
>
> So it looks like the problem here is that some paths in the original
> unpatched code end up calling hid_hw_stop() by way of the hid_device's
> driver, and other paths do not.
>
> I haven't had time to track down this difference.  Maybe somebody
> on the mailing list already knows why it occurs.

Trying Alan's fix from another thread here:

#syz test: https://github.com/google/kasan.git 7f7867ff

[-- Attachment #2: logitech.patch --]
[-- Type: text/x-patch, Size: 1202 bytes --]

Index: usb-devel/drivers/hid/hid-lg.c
===================================================================
--- usb-devel.orig/drivers/hid/hid-lg.c
+++ usb-devel/drivers/hid/hid-lg.c
@@ -818,7 +818,7 @@ static int lg_probe(struct hid_device *h
 
 		if (!buf) {
 			ret = -ENOMEM;
-			goto err_free;
+			goto err_stop;
 		}
 
 		ret = hid_hw_raw_request(hdev, buf[0], buf, sizeof(cbuf),
@@ -850,9 +850,12 @@ static int lg_probe(struct hid_device *h
 		ret = lg4ff_init(hdev);
 
 	if (ret)
-		goto err_free;
+		goto err_stop;
 
 	return 0;
+
+err_stop:
+	hid_hw_stop(hdev);
 err_free:
 	kfree(drv_data);
 	return ret;
@@ -863,8 +866,7 @@ static void lg_remove(struct hid_device
 	struct lg_drv_data *drv_data = hid_get_drvdata(hdev);
 	if (drv_data->quirks & LG_FF4)
 		lg4ff_deinit(hdev);
-	else
-		hid_hw_stop(hdev);
+	hid_hw_stop(hdev);
 	kfree(drv_data);
 }
 
Index: usb-devel/drivers/hid/hid-lg4ff.c
===================================================================
--- usb-devel.orig/drivers/hid/hid-lg4ff.c
+++ usb-devel/drivers/hid/hid-lg4ff.c
@@ -1477,7 +1477,6 @@ int lg4ff_deinit(struct hid_device *hid)
 		}
 	}
 #endif
-	hid_hw_stop(hid);
 	drv_data->device_props = NULL;
 
 	kfree(entry);

Re: WARNING in usbhid_raw_request/usb_submit_urb

[syzbot]

Hello,

syzbot has tested the proposed patch and the reproducer did not trigger  
crash:

Reported-and-tested-by:  
syzbot+a7a6b9c609b9457c62c6@syzkaller.appspotmail.com

Tested on:

commit:         7f7867ff usb-fuzzer: main usb gadget fuzzer driver
git tree:       https://github.com/google/kasan.git
kernel config:  https://syzkaller.appspot.com/x/.config?x=792eb47789f57810
compiler:       gcc (GCC) 9.0.0 20181231 (experimental)
patch:          https://syzkaller.appspot.com/x/patch.diff?x=140148ca600000

Note: testing is done by a robot and is best-effort only.

Re: WARNING in usbhid_raw_request/usb_submit_urb

[Andrey Konovalov]

On Wed, Aug 21, 2019 at 3:09 PM syzbot
<syzbot+a7a6b9c609b9457c62c6@syzkaller.appspotmail.com> wrote:
>
> Hello,
>
> syzbot has tested the proposed patch and the reproducer did not trigger
> crash:
>
> Reported-and-tested-by:
> syzbot+a7a6b9c609b9457c62c6@syzkaller.appspotmail.com
>
> Tested on:
>
> commit:         7f7867ff usb-fuzzer: main usb gadget fuzzer driver
> git tree:       https://github.com/google/kasan.git
> kernel config:  https://syzkaller.appspot.com/x/.config?x=792eb47789f57810
> compiler:       gcc (GCC) 9.0.0 20181231 (experimental)
> patch:          https://syzkaller.appspot.com/x/patch.diff?x=140148ca600000
>
> Note: testing is done by a robot and is best-effort only.

Looks like the same bug:

#syz dup: general protection fault in __pm_runtime_resume

Re: WARNING in usbhid_raw_request/usb_submit_urb

[Andrey Konovalov]

On Mon, Aug 12, 2019 at 4:47 PM Hillf Danton <hdanton@sina.com> wrote:
>
>
> Hi Andrey
>
> On Mon, 12 Aug 2019 06:03:01 -0700
> > Hello,
> >
> > syzbot has tested the proposed patch but the reproducer still triggered
> > crash:
> > KASAN: invalid-free in hcd_buffer_free
> >
> > usb 5-1: USB disconnect, device number 2
> > ==================================================================
> > BUG: KASAN: double-free or invalid-free in hcd_buffer_free+0x199/0x260
> > drivers/usb/core/buffer.c:165
>
> JFYI:
> 1, the hid-core.patch in the attachment at
> https://lore.kernel.org/lkml/CAAeHK+z-uCr-bWu9uVDynU2S=wCrtxRbuA-Cut=h5zYuYcS-Cw@mail.gmail.com/
>
> ===quote begin===
> > IMPORTANT: if you fix the bug, please add the following tag to the commit:
> > Reported-by: syzbot+a7a6b9c609b9457c62c6@syzkaller.appspotmail.com
>
> Let's try Hillf's patch here as well:
>
> #syz test: https://github.com/google/kasan.git 7f7867ff

Remove # when quoting syzbot commands, as this will trigger syzbot
testing again =)

>
> >
> > ------------[ cut here ]------------
> > usb 2-1: BOGUS urb xfer, pipe 2 != type 2
> > WARNING: CPU: 1 PID: 7429 at drivers/usb/core/urb.c:477
> > usb_submit_urb+0x1188/0x13b0 drivers/usb/core/urb.c:477
> ===quote end===
>
> is identical to the patch for
> #syz test: https://github.com/google/kasan.git 6a3599ce
> Reported-by: syzbot+3cbe5cd105d2ad56a1df@syzkaller.appspotmail.com
>
> --- a/drivers/hid/usbhid/hid-core.c
> +++ b/drivers/hid/usbhid/hid-core.c
> @@ -1410,6 +1410,7 @@ static void usbhid_disconnect(struct usb
>         spin_lock_irq(&usbhid->lock);   /* Sync with error and led handlers */
>         set_bit(HID_DISCONNECTED, &usbhid->iofl);
>         spin_unlock_irq(&usbhid->lock);
> +       hid_hw_stop(hid);
>         hid_destroy_device(hid);
>         kfree(usbhid);
>  }
>
>
> 2, based on the report itself in the quote section above,
>
>         > usb 2-1: BOGUS urb xfer, pipe 2 != type 2
>
> I suggest that we get it invalidated for now. If unfortunately it comes
> up again we know at least what once happened.
>
> 3, this is a new report I did not see before, and worth a new report
> thread with a new subject line. See it soon after 7 hours of sleep and
> prepare patch with Test-by.

Let's dup it into the PM report:

#syz dup: general protection fault in __pm_runtime_resume

Once the fix is in the USB fuzzer tree, the double-free will be
reported in a separate thread (once it gets hit again).

>
> Thanks
> Hillf
>
> >
> > CPU: 0 PID: 1745 Comm: kworker/0:2 Not tainted 5.3.0-rc2+ #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
> >   print_address_description+0x6a/0x32c mm/kasan/report.c:351
> >   kasan_report_invalid_free+0x61/0xa0 mm/kasan/report.c:444
> >   __kasan_slab_free+0x162/0x180 mm/kasan/common.c:428
> >   slab_free_hook mm/slub.c:1423 [inline]
> >   slab_free_freelist_hook mm/slub.c:1470 [inline]
> >   slab_free mm/slub.c:3012 [inline]
> >   kfree+0xe4/0x2f0 mm/slub.c:3953
> >   hcd_buffer_free+0x199/0x260 drivers/usb/core/buffer.c:165
> >   usb_free_coherent+0x67/0x80 drivers/usb/core/usb.c:932
> >   hid_free_buffers.isra.0+0x94/0x290 drivers/hid/usbhid/hid-core.c:964
> >   usbhid_stop+0x308/0x450 drivers/hid/usbhid/hid-core.c:1224
> >   logi_dj_remove+0x107/0x210 drivers/hid/hid-logitech-dj.c:1797
> >   hid_device_remove+0xed/0x240 drivers/hid/hid-core.c:2242
> >   __device_release_driver drivers/base/dd.c:1118 [inline]
> >   device_release_driver_internal+0x206/0x4c0 drivers/base/dd.c:1151
> >   bus_remove_device+0x2dc/0x4a0 drivers/base/bus.c:556
> >   device_del+0x420/0xb10 drivers/base/core.c:2288
> >   hid_remove_device drivers/hid/hid-core.c:2413 [inline]
> >   hid_destroy_device+0xe1/0x150 drivers/hid/hid-core.c:2432
> >   usbhid_disconnect+0xad/0xd0 drivers/hid/usbhid/hid-core.c:1414
> >   usb_unbind_interface+0x1bd/0x8a0 drivers/usb/core/driver.c:423
> >   __device_release_driver drivers/base/dd.c:1120 [inline]
> >   device_release_driver_internal+0x404/0x4c0 drivers/base/dd.c:1151
> >   bus_remove_device+0x2dc/0x4a0 drivers/base/bus.c:556
> >   device_del+0x420/0xb10 drivers/base/core.c:2288
> >   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
> >   process_scheduled_works kernel/workqueue.c:2331 [inline]
> >   worker_thread+0x7ab/0xe20 kernel/workqueue.c:2417
> >   kthread+0x318/0x420 kernel/kthread.c:255
> >   ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352
> >
> > Allocated by task 1745:
> >   save_stack+0x1b/0x80 mm/kasan/common.c:69
> >   set_track mm/kasan/common.c:77 [inline]
> >   __kasan_kmalloc mm/kasan/common.c:487 [inline]
> >   __kasan_kmalloc.constprop.0+0xbf/0xd0 mm/kasan/common.c:460
> >   kmalloc include/linux/slab.h:557 [inline]
> >   hcd_buffer_alloc+0x1ca/0x290 drivers/usb/core/buffer.c:135
> >   usb_alloc_coherent+0x5d/0x80 drivers/usb/core/usb.c:910
> >   hid_alloc_buffers drivers/hid/usbhid/hid-core.c:846 [inline]
> >   usbhid_start+0x60b/0x22f0 drivers/hid/usbhid/hid-core.c:1075
> >   hid_hw_start+0x5d/0x130 drivers/hid/hid-core.c:1976
> >   logi_dj_probe+0x808/0xcd7 drivers/hid/hid-logitech-dj.c:1703
> >   hid_device_probe+0x2be/0x3f0 drivers/hid/hid-core.c:2209
> >   really_probe+0x281/0x650 drivers/base/dd.c:548
> >   driver_probe_device+0x101/0x1b0 drivers/base/dd.c:709
> >   __device_attach_driver+0x1c2/0x220 drivers/base/dd.c:816
> >   bus_for_each_drv+0x15c/0x1e0 drivers/base/bus.c:454
> >   __device_attach+0x217/0x360 drivers/base/dd.c:882
> >   bus_probe_device+0x1e4/0x290 drivers/base/bus.c:514
> >   device_add+0xae6/0x16f0 drivers/base/core.c:2114
> >   hid_add_device+0x33c/0x990 drivers/hid/hid-core.c:2365
> >   usbhid_probe+0xa81/0xfa0 drivers/hid/usbhid/hid-core.c:1386
> >   usb_probe_interface+0x305/0x7a0 drivers/usb/core/driver.c:361
> >   really_probe+0x281/0x650 drivers/base/dd.c:548
> >   driver_probe_device+0x101/0x1b0 drivers/base/dd.c:709
> >   __device_attach_driver+0x1c2/0x220 drivers/base/dd.c:816
> >   bus_for_each_drv+0x15c/0x1e0 drivers/base/bus.c:454
> >   __device_attach+0x217/0x360 drivers/base/dd.c:882
> >   bus_probe_device+0x1e4/0x290 drivers/base/bus.c:514
> >   device_add+0xae6/0x16f0 drivers/base/core.c:2114
> >   usb_set_configuration+0xdf6/0x1670 drivers/usb/core/message.c:2023
> >   generic_probe+0x9d/0xd5 drivers/usb/core/generic.c:210
> >   usb_probe_device+0x99/0x100 drivers/usb/core/driver.c:266
> >   really_probe+0x281/0x650 drivers/base/dd.c:548
> >   driver_probe_device+0x101/0x1b0 drivers/base/dd.c:709
> >   __device_attach_driver+0x1c2/0x220 drivers/base/dd.c:816
> >   bus_for_each_drv+0x15c/0x1e0 drivers/base/bus.c:454
> >   __device_attach+0x217/0x360 drivers/base/dd.c:882
> >   bus_probe_device+0x1e4/0x290 drivers/base/bus.c:514
> >   device_add+0xae6/0x16f0 drivers/base/core.c:2114
> >   usb_new_device.cold+0x6a4/0xe79 drivers/usb/core/hub.c:2536
> >   hub_port_connect drivers/usb/core/hub.c:5098 [inline]
> >   hub_port_connect_change drivers/usb/core/hub.c:5213 [inline]
> >   port_event drivers/usb/core/hub.c:5359 [inline]
> >   hub_event+0x1b5c/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
> >
> > Freed by task 1745:
> >   save_stack+0x1b/0x80 mm/kasan/common.c:69
> >   set_track mm/kasan/common.c:77 [inline]
> >   __kasan_slab_free+0x130/0x180 mm/kasan/common.c:449
> >   slab_free_hook mm/slub.c:1423 [inline]
> >   slab_free_freelist_hook mm/slub.c:1470 [inline]
> >   slab_free mm/slub.c:3012 [inline]
> >   kfree+0xe4/0x2f0 mm/slub.c:3953
> >   hcd_buffer_free+0x199/0x260 drivers/usb/core/buffer.c:165
> >   usb_free_coherent+0x67/0x80 drivers/usb/core/usb.c:932
> >   hid_free_buffers.isra.0+0x94/0x290 drivers/hid/usbhid/hid-core.c:964
> >   usbhid_stop+0x308/0x450 drivers/hid/usbhid/hid-core.c:1224
> >   usbhid_disconnect+0xa5/0xd0 drivers/hid/usbhid/hid-core.c:1413
> >   usb_unbind_interface+0x1bd/0x8a0 drivers/usb/core/driver.c:423
> >   __device_release_driver drivers/base/dd.c:1120 [inline]
> >   device_release_driver_internal+0x404/0x4c0 drivers/base/dd.c:1151
> >   bus_remove_device+0x2dc/0x4a0 drivers/base/bus.c:556
> >   device_del+0x420/0xb10 drivers/base/core.c:2288
> >   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
> >   process_scheduled_works kernel/workqueue.c:2331 [inline]
> >   worker_thread+0x7ab/0xe20 kernel/workqueue.c:2417
> >   kthread+0x318/0x420 kernel/kthread.c:255
> >   ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352
> >
> > The buggy address belongs to the object at ffff8881d5875500
> >   which belongs to the cache kmalloc-4k of size 4096
> > The buggy address is located 0 bytes inside of
> >   4096-byte region [ffff8881d5875500, ffff8881d5876500)
> > The buggy address belongs to the page:
> > page:ffffea0007561c00 refcount:1 mapcount:0 mapping:ffff8881da00c280
> > index:0x0 compound_mapcount: 0
> > flags: 0x200000000010200(slab|head)
> > raw: 0200000000010200 dead000000000100 dead000000000122 ffff8881da00c280
> > raw: 0000000000000000 0000000000070007 00000001ffffffff 0000000000000000
> > page dumped because: kasan: bad access detected
> >
> > Memory state around the buggy address:
> >   ffff8881d5875400: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
> >   ffff8881d5875480: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
> > > ffff8881d5875500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
> >                     ^
> >   ffff8881d5875580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
> >   ffff8881d5875600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
> > ==================================================================
> >
> >
> > Tested on:
> >
> > commit:         7f7867ff 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=13833b9a600000
> > kernel config:  https://syzkaller.appspot.com/x/.config?x=792eb47789f57810
> > compiler:       gcc (GCC) 9.0.0 20181231 (experimental)
> > patch:          https://syzkaller.appspot.com/x/patch.diff?x=167d2a0e600000
>

Re: general protection fault in __pm_runtime_resume

[syzbot]

Hello,

syzbot has tested the proposed patch and the reproducer did not trigger  
crash:

Reported-and-tested-by:  
syzbot+3cbe5cd105d2ad56a1df@syzkaller.appspotmail.com

Tested on:

commit:         7f7867ff usb-fuzzer: main usb gadget fuzzer driver
git tree:       https://github.com/google/kasan.git
kernel config:  https://syzkaller.appspot.com/x/.config?x=792eb47789f57810
compiler:       gcc (GCC) 9.0.0 20181231 (experimental)
patch:          https://syzkaller.appspot.com/x/patch.diff?x=177252d2600000

Note: testing is done by a robot and is best-effort only.

Re: general protection fault in __pm_runtime_resume

[Alan Stern]

On Mon, 12 Aug 2019, syzbot wrote:

> Hello,
> 
> syzbot has tested the proposed patch and the reproducer did not trigger  
> crash:
> 
> Reported-and-tested-by:  
> syzbot+3cbe5cd105d2ad56a1df@syzkaller.appspotmail.com
> 
> Tested on:
> 
> commit:         7f7867ff usb-fuzzer: main usb gadget fuzzer driver
> git tree:       https://github.com/google/kasan.git
> kernel config:  https://syzkaller.appspot.com/x/.config?x=792eb47789f57810
> compiler:       gcc (GCC) 9.0.0 20181231 (experimental)
> patch:          https://syzkaller.appspot.com/x/patch.diff?x=177252d2600000
> 
> Note: testing is done by a robot and is best-effort only.

That was the result from testing Hillf's patch:

--- a/drivers/hid/usbhid/hid-core.c
+++ b/drivers/hid/usbhid/hid-core.c
@@ -1410,6 +1410,7 @@ static void usbhid_disconnect(struct usb
        spin_lock_irq(&usbhid->lock);   /* Sync with error and led handlers */
        set_bit(HID_DISCONNECTED, &usbhid->iofl);
        spin_unlock_irq(&usbhid->lock);
+       hid_hw_stop(hid);
        hid_destroy_device(hid);
        kfree(usbhid);
 }

There is very good reason to believe this patch is not the correct
solution to the problem.  For one thing, in some circumstances the
patch ends up calling hid_hw_stop() twice (not shown here, but we have 
seen this in other bug reports from syzbot).

For another, I have just tested a different patch and found that it 
also prevents this particular crash:

> Hello,
>
> syzbot has tested the proposed patch and the reproducer did not trigger
> crash:
>
> Reported-and-tested-by:
> syzbot+3cbe5cd105d2ad56a1df@syzkaller.appspotmail.com
>
> Tested on:
>
> commit:         6a3599ce usb-fuzzer: main usb gadget fuzzer driver
> git tree:       https://github.com/google/kasan.git
> kernel config:  https://syzkaller.appspot.com/x/.config?x=700ca426ab83faae
> compiler:       gcc (GCC) 9.0.0 20181231 (experimental)
> patch:          https://syzkaller.appspot.com/x/patch.diff?x=170b66a6600000
>
> Note: testing is done by a robot and is best-effort only.

My patch:

Index: usb-devel/drivers/hid/hid-lg.c
===================================================================
--- usb-devel.orig/drivers/hid/hid-lg.c
+++ usb-devel/drivers/hid/hid-lg.c
@@ -818,7 +818,7 @@ static int lg_probe(struct hid_device *h
 
 		if (!buf) {
 			ret = -ENOMEM;
-			goto err_free;
+			goto err_stop;
 		}
 
 		ret = hid_hw_raw_request(hdev, buf[0], buf, sizeof(cbuf),
@@ -850,9 +850,12 @@ static int lg_probe(struct hid_device *h
 		ret = lg4ff_init(hdev);
 
 	if (ret)
-		goto err_free;
+		goto err_stop;
 
 	return 0;
+
+err_stop:
+	hid_hw_stop(hdev);
 err_free:
 	kfree(drv_data);
 	return ret;
@@ -863,8 +866,7 @@ static void lg_remove(struct hid_device
 	struct lg_drv_data *drv_data = hid_get_drvdata(hdev);
 	if (drv_data->quirks & LG_FF4)
 		lg4ff_deinit(hdev);
-	else
-		hid_hw_stop(hdev);
+	hid_hw_stop(hdev);
 	kfree(drv_data);
 }
 
Index: usb-devel/drivers/hid/hid-lg4ff.c
===================================================================
--- usb-devel.orig/drivers/hid/hid-lg4ff.c
+++ usb-devel/drivers/hid/hid-lg4ff.c
@@ -1477,7 +1477,6 @@ int lg4ff_deinit(struct hid_device *hid)
 		}
 	}
 #endif
-	hid_hw_stop(hid);
 	drv_data->device_props = NULL;
 
 	kfree(entry);

This fixes a fairly obvious bug in the hid-lg driver: It does not 
always call hid_hw_stop() in all pathways after calling hid_hw_start().

Presumably the same is true for the other related bugs found by syzbot.  
I'm doing some more testing and we will see...

Alan Stern

[PATCH] HID: USB: Fix general protection fault caused by Logitech driver

[Alan Stern]

The syzbot fuzzer found a general protection fault in the HID subsystem:

kasan: CONFIG_KASAN_INLINE enabled
kasan: GPF could be caused by NULL-ptr deref or user memory access
general protection fault: 0000 [#1] SMP KASAN
CPU: 0 PID: 3715 Comm: syz-executor.3 Not tainted 5.2.0-rc6+ #15
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS  
Google 01/01/2011
RIP: 0010:__pm_runtime_resume+0x49/0x180 drivers/base/power/runtime.c:1069
Code: ed 74 d5 fe 45 85 ed 0f 85 9a 00 00 00 e8 6f 73 d5 fe 48 8d bd c1 02  
00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <0f> b6 04 02 48  
89 fa 83 e2 07 38 d0 7f 08 84 c0 0f 85 fe 00 00 00
RSP: 0018:ffff8881d99d78e0 EFLAGS: 00010202
RAX: dffffc0000000000 RBX: 0000000000000020 RCX: ffffc90003f3f000
RDX: 0000000416d8686d RSI: ffffffff82676841 RDI: 00000020b6c3436a
RBP: 00000020b6c340a9 R08: ffff8881c6d64800 R09: fffffbfff0e84c25
R10: ffff8881d99d7940 R11: ffffffff87426127 R12: 0000000000000004
R13: 0000000000000000 R14: ffff8881d9b94000 R15: ffffffff897f9048
FS:  00007f047f542700(0000) GS:ffff8881db200000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b30f21000 CR3: 00000001ca032000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
  pm_runtime_get_sync include/linux/pm_runtime.h:226 [inline]
  usb_autopm_get_interface+0x1b/0x50 drivers/usb/core/driver.c:1707
  usbhid_power+0x7c/0xe0 drivers/hid/usbhid/hid-core.c:1234
  hid_hw_power include/linux/hid.h:1038 [inline]
  hidraw_open+0x20d/0x740 drivers/hid/hidraw.c:282
  chrdev_open+0x219/0x5c0 fs/char_dev.c:413
  do_dentry_open+0x497/0x1040 fs/open.c:778
  do_last fs/namei.c:3416 [inline]
  path_openat+0x1430/0x3ff0 fs/namei.c:3533
  do_filp_open+0x1a1/0x280 fs/namei.c:3563
  do_sys_open+0x3c0/0x580 fs/open.c:1070
  do_syscall_64+0xb7/0x560 arch/x86/entry/common.c:301
  entry_SYSCALL_64_after_hwframe+0x49/0xbe

It turns out the fault was caused by a bug in the HID Logitech driver,
which violates the requirement that every pathway calling
hid_hw_start() must also call hid_hw_stop().  This patch fixes the bug
by making sure the requirement is met.

Reported-and-tested-by: syzbot+3cbe5cd105d2ad56a1df@syzkaller.appspotmail.com
Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
CC: <stable@vger.kernel.org>

---

[as1909]


 drivers/hid/hid-lg.c    |   10 ++++++----
 drivers/hid/hid-lg4ff.c |    1 -
 2 files changed, 6 insertions(+), 5 deletions(-)

Index: usb-devel/drivers/hid/hid-lg.c
===================================================================
--- usb-devel.orig/drivers/hid/hid-lg.c
+++ usb-devel/drivers/hid/hid-lg.c
@@ -818,7 +818,7 @@ static int lg_probe(struct hid_device *h
 
 		if (!buf) {
 			ret = -ENOMEM;
-			goto err_free;
+			goto err_stop;
 		}
 
 		ret = hid_hw_raw_request(hdev, buf[0], buf, sizeof(cbuf),
@@ -850,9 +850,12 @@ static int lg_probe(struct hid_device *h
 		ret = lg4ff_init(hdev);
 
 	if (ret)
-		goto err_free;
+		goto err_stop;
 
 	return 0;
+
+err_stop:
+	hid_hw_stop(hdev);
 err_free:
 	kfree(drv_data);
 	return ret;
@@ -863,8 +866,7 @@ static void lg_remove(struct hid_device
 	struct lg_drv_data *drv_data = hid_get_drvdata(hdev);
 	if (drv_data->quirks & LG_FF4)
 		lg4ff_deinit(hdev);
-	else
-		hid_hw_stop(hdev);
+	hid_hw_stop(hdev);
 	kfree(drv_data);
 }
 
Index: usb-devel/drivers/hid/hid-lg4ff.c
===================================================================
--- usb-devel.orig/drivers/hid/hid-lg4ff.c
+++ usb-devel/drivers/hid/hid-lg4ff.c
@@ -1477,7 +1477,6 @@ int lg4ff_deinit(struct hid_device *hid)
 		}
 	}
 #endif
-	hid_hw_stop(hid);
 	drv_data->device_props = NULL;
 
 	kfree(entry);

Re: [PATCH] HID: USB: Fix general protection fault caused by Logitech driver

[Andrey Konovalov]

On Tue, Aug 20, 2019 at 10:00 PM Alan Stern <stern@rowland.harvard.edu> wrote:
>
> The syzbot fuzzer found a general protection fault in the HID subsystem:
>
> kasan: CONFIG_KASAN_INLINE enabled
> kasan: GPF could be caused by NULL-ptr deref or user memory access
> general protection fault: 0000 [#1] SMP KASAN
> CPU: 0 PID: 3715 Comm: syz-executor.3 Not tainted 5.2.0-rc6+ #15
> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
> Google 01/01/2011
> RIP: 0010:__pm_runtime_resume+0x49/0x180 drivers/base/power/runtime.c:1069
> Code: ed 74 d5 fe 45 85 ed 0f 85 9a 00 00 00 e8 6f 73 d5 fe 48 8d bd c1 02
> 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <0f> b6 04 02 48
> 89 fa 83 e2 07 38 d0 7f 08 84 c0 0f 85 fe 00 00 00
> RSP: 0018:ffff8881d99d78e0 EFLAGS: 00010202
> RAX: dffffc0000000000 RBX: 0000000000000020 RCX: ffffc90003f3f000
> RDX: 0000000416d8686d RSI: ffffffff82676841 RDI: 00000020b6c3436a
> RBP: 00000020b6c340a9 R08: ffff8881c6d64800 R09: fffffbfff0e84c25
> R10: ffff8881d99d7940 R11: ffffffff87426127 R12: 0000000000000004
> R13: 0000000000000000 R14: ffff8881d9b94000 R15: ffffffff897f9048
> FS:  00007f047f542700(0000) GS:ffff8881db200000(0000) knlGS:0000000000000000
> CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> CR2: 0000001b30f21000 CR3: 00000001ca032000 CR4: 00000000001406f0
> DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
> Call Trace:
>   pm_runtime_get_sync include/linux/pm_runtime.h:226 [inline]
>   usb_autopm_get_interface+0x1b/0x50 drivers/usb/core/driver.c:1707
>   usbhid_power+0x7c/0xe0 drivers/hid/usbhid/hid-core.c:1234
>   hid_hw_power include/linux/hid.h:1038 [inline]
>   hidraw_open+0x20d/0x740 drivers/hid/hidraw.c:282
>   chrdev_open+0x219/0x5c0 fs/char_dev.c:413
>   do_dentry_open+0x497/0x1040 fs/open.c:778
>   do_last fs/namei.c:3416 [inline]
>   path_openat+0x1430/0x3ff0 fs/namei.c:3533
>   do_filp_open+0x1a1/0x280 fs/namei.c:3563
>   do_sys_open+0x3c0/0x580 fs/open.c:1070
>   do_syscall_64+0xb7/0x560 arch/x86/entry/common.c:301
>   entry_SYSCALL_64_after_hwframe+0x49/0xbe
>
> It turns out the fault was caused by a bug in the HID Logitech driver,
> which violates the requirement that every pathway calling
> hid_hw_start() must also call hid_hw_stop().  This patch fixes the bug
> by making sure the requirement is met.
>
> Reported-and-tested-by: syzbot+3cbe5cd105d2ad56a1df@syzkaller.appspotmail.com
> Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
> CC: <stable@vger.kernel.org>

This bug has manifested in a bunch of different ways and produced
multiple confusing syzbot reports. Thank you for tracking this down
and fixing it, Alan!


>
> ---
>
> [as1909]
>
>
>  drivers/hid/hid-lg.c    |   10 ++++++----
>  drivers/hid/hid-lg4ff.c |    1 -
>  2 files changed, 6 insertions(+), 5 deletions(-)
>
> Index: usb-devel/drivers/hid/hid-lg.c
> ===================================================================
> --- usb-devel.orig/drivers/hid/hid-lg.c
> +++ usb-devel/drivers/hid/hid-lg.c
> @@ -818,7 +818,7 @@ static int lg_probe(struct hid_device *h
>
>                 if (!buf) {
>                         ret = -ENOMEM;
> -                       goto err_free;
> +                       goto err_stop;
>                 }
>
>                 ret = hid_hw_raw_request(hdev, buf[0], buf, sizeof(cbuf),
> @@ -850,9 +850,12 @@ static int lg_probe(struct hid_device *h
>                 ret = lg4ff_init(hdev);
>
>         if (ret)
> -               goto err_free;
> +               goto err_stop;
>
>         return 0;
> +
> +err_stop:
> +       hid_hw_stop(hdev);
>  err_free:
>         kfree(drv_data);
>         return ret;
> @@ -863,8 +866,7 @@ static void lg_remove(struct hid_device
>         struct lg_drv_data *drv_data = hid_get_drvdata(hdev);
>         if (drv_data->quirks & LG_FF4)
>                 lg4ff_deinit(hdev);
> -       else
> -               hid_hw_stop(hdev);
> +       hid_hw_stop(hdev);
>         kfree(drv_data);
>  }
>
> Index: usb-devel/drivers/hid/hid-lg4ff.c
> ===================================================================
> --- usb-devel.orig/drivers/hid/hid-lg4ff.c
> +++ usb-devel/drivers/hid/hid-lg4ff.c
> @@ -1477,7 +1477,6 @@ int lg4ff_deinit(struct hid_device *hid)
>                 }
>         }
>  #endif
> -       hid_hw_stop(hid);
>         drv_data->device_props = NULL;
>
>         kfree(entry);
>

Re: [PATCH] HID: USB: Fix general protection fault caused by Logitech driver

[Jiri Kosina]

On Tue, 20 Aug 2019, Alan Stern wrote:

> The syzbot fuzzer found a general protection fault in the HID subsystem:

Applied, thanks a lot Alan.

-- 
Jiri Kosina
SUSE Labs

Re: [PATCH] HID: USB: Fix general protection fault caused by Logitech driver

[Andrey Konovalov]

On Tue, Aug 20, 2019 at 10:00 PM Alan Stern <stern@rowland.harvard.edu> wrote:
>
> The syzbot fuzzer found a general protection fault in the HID subsystem:
>
> kasan: CONFIG_KASAN_INLINE enabled
> kasan: GPF could be caused by NULL-ptr deref or user memory access
> general protection fault: 0000 [#1] SMP KASAN
> CPU: 0 PID: 3715 Comm: syz-executor.3 Not tainted 5.2.0-rc6+ #15
> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
> Google 01/01/2011
> RIP: 0010:__pm_runtime_resume+0x49/0x180 drivers/base/power/runtime.c:1069
> Code: ed 74 d5 fe 45 85 ed 0f 85 9a 00 00 00 e8 6f 73 d5 fe 48 8d bd c1 02
> 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <0f> b6 04 02 48
> 89 fa 83 e2 07 38 d0 7f 08 84 c0 0f 85 fe 00 00 00
> RSP: 0018:ffff8881d99d78e0 EFLAGS: 00010202
> RAX: dffffc0000000000 RBX: 0000000000000020 RCX: ffffc90003f3f000
> RDX: 0000000416d8686d RSI: ffffffff82676841 RDI: 00000020b6c3436a
> RBP: 00000020b6c340a9 R08: ffff8881c6d64800 R09: fffffbfff0e84c25
> R10: ffff8881d99d7940 R11: ffffffff87426127 R12: 0000000000000004
> R13: 0000000000000000 R14: ffff8881d9b94000 R15: ffffffff897f9048
> FS:  00007f047f542700(0000) GS:ffff8881db200000(0000) knlGS:0000000000000000
> CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> CR2: 0000001b30f21000 CR3: 00000001ca032000 CR4: 00000000001406f0
> DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
> Call Trace:
>   pm_runtime_get_sync include/linux/pm_runtime.h:226 [inline]
>   usb_autopm_get_interface+0x1b/0x50 drivers/usb/core/driver.c:1707
>   usbhid_power+0x7c/0xe0 drivers/hid/usbhid/hid-core.c:1234
>   hid_hw_power include/linux/hid.h:1038 [inline]
>   hidraw_open+0x20d/0x740 drivers/hid/hidraw.c:282
>   chrdev_open+0x219/0x5c0 fs/char_dev.c:413
>   do_dentry_open+0x497/0x1040 fs/open.c:778
>   do_last fs/namei.c:3416 [inline]
>   path_openat+0x1430/0x3ff0 fs/namei.c:3533
>   do_filp_open+0x1a1/0x280 fs/namei.c:3563
>   do_sys_open+0x3c0/0x580 fs/open.c:1070
>   do_syscall_64+0xb7/0x560 arch/x86/entry/common.c:301
>   entry_SYSCALL_64_after_hwframe+0x49/0xbe
>
> It turns out the fault was caused by a bug in the HID Logitech driver,
> which violates the requirement that every pathway calling
> hid_hw_start() must also call hid_hw_stop().  This patch fixes the bug
> by making sure the requirement is met.
>
> Reported-and-tested-by: syzbot+3cbe5cd105d2ad56a1df@syzkaller.appspotmail.com
> Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
> CC: <stable@vger.kernel.org>
>
> ---
>
> [as1909]
>
>
>  drivers/hid/hid-lg.c    |   10 ++++++----
>  drivers/hid/hid-lg4ff.c |    1 -
>  2 files changed, 6 insertions(+), 5 deletions(-)
>
> Index: usb-devel/drivers/hid/hid-lg.c
> ===================================================================
> --- usb-devel.orig/drivers/hid/hid-lg.c
> +++ usb-devel/drivers/hid/hid-lg.c
> @@ -818,7 +818,7 @@ static int lg_probe(struct hid_device *h
>
>                 if (!buf) {
>                         ret = -ENOMEM;
> -                       goto err_free;
> +                       goto err_stop;
>                 }
>
>                 ret = hid_hw_raw_request(hdev, buf[0], buf, sizeof(cbuf),
> @@ -850,9 +850,12 @@ static int lg_probe(struct hid_device *h
>                 ret = lg4ff_init(hdev);
>
>         if (ret)
> -               goto err_free;
> +               goto err_stop;
>
>         return 0;
> +
> +err_stop:
> +       hid_hw_stop(hdev);
>  err_free:
>         kfree(drv_data);
>         return ret;
> @@ -863,8 +866,7 @@ static void lg_remove(struct hid_device
>         struct lg_drv_data *drv_data = hid_get_drvdata(hdev);
>         if (drv_data->quirks & LG_FF4)
>                 lg4ff_deinit(hdev);
> -       else
> -               hid_hw_stop(hdev);
> +       hid_hw_stop(hdev);
>         kfree(drv_data);
>  }
>
> Index: usb-devel/drivers/hid/hid-lg4ff.c
> ===================================================================
> --- usb-devel.orig/drivers/hid/hid-lg4ff.c
> +++ usb-devel/drivers/hid/hid-lg4ff.c
> @@ -1477,7 +1477,6 @@ int lg4ff_deinit(struct hid_device *hid)
>                 }
>         }
>  #endif
> -       hid_hw_stop(hid);
>         drv_data->device_props = NULL;
>
>         kfree(entry);
>

Hi Alan,

I've ran the fuzzer with your patches applied overnight and noticed
another fallout of similar bugs. I think they are caused by a similar
issue in the sony HID driver. There's no hid_hw_stop() call in the "if
(!(hdev->claimed & HID_CLAIMED_INPUT))" case in sony_probe(). Does it
look like a bug to you?

Thanks!

Re: [PATCH] HID: USB: Fix general protection fault caused by Logitech driver

[Alan Stern]

On Thu, 22 Aug 2019, Andrey Konovalov wrote:

> Hi Alan,
> 
> I've ran the fuzzer with your patches applied overnight and noticed
> another fallout of similar bugs. I think they are caused by a similar
> issue in the sony HID driver. There's no hid_hw_stop() call in the "if
> (!(hdev->claimed & HID_CLAIMED_INPUT))" case in sony_probe(). Does it
> look like a bug to you?

It looks like the relevant hid_hw_stop() call is the one at the end of
sony_configure_input().  But I can't tell if doing that way is valid or
not -- in practice the code would end up calling hid_disconnect() while
hid_connect() was still running, which doesn't seem like a good idea.

There's a comment about this near the end of sony_probe().  I suspect
it would be better to call hid_hw_stop() in the conditional code
following that comment rather than in sony_configure_input().

Either way, these are all things Jiri should know about or check up on.

Have you gotten any test results from syzbot exercising these pathways?  
You ought to be able to tell which HID driver is involved by looking
through the console output.

Alan Stern

Re: [PATCH] HID: USB: Fix general protection fault caused by Logitech driver

[Andrey Konovalov]

On Thu, Aug 22, 2019 at 7:11 PM Alan Stern <stern@rowland.harvard.edu> wrote:
>
> On Thu, 22 Aug 2019, Andrey Konovalov wrote:
>
> > Hi Alan,
> >
> > I've ran the fuzzer with your patches applied overnight and noticed
> > another fallout of similar bugs. I think they are caused by a similar
> > issue in the sony HID driver. There's no hid_hw_stop() call in the "if
> > (!(hdev->claimed & HID_CLAIMED_INPUT))" case in sony_probe(). Does it
> > look like a bug to you?
>
> It looks like the relevant hid_hw_stop() call is the one at the end of
> sony_configure_input().  But I can't tell if doing that way is valid or
> not -- in practice the code would end up calling hid_disconnect() while
> hid_connect() was still running, which doesn't seem like a good idea.
>
> There's a comment about this near the end of sony_probe().  I suspect
> it would be better to call hid_hw_stop() in the conditional code
> following that comment rather than in sony_configure_input().
>
> Either way, these are all things Jiri should know about or check up on.
>
> Have you gotten any test results from syzbot exercising these pathways?
> You ought to be able to tell which HID driver is involved by looking
> through the console output.

Yes, a typical crash is below, that's why I thought it's the sony
driver. Adding hid_hw_stop() in sony_probe() stops the issue from
happening, but I don't know whether it's the right fix.

usb 1-1: new high-speed USB device number 3 using dummy_hcd
usb 1-1: Using ep0 maxpacket: 8
usb 1-1: config 0 interface 0 altsetting 0 endpoint 0x81 has an
invalid bInterval 0, changing7
usb 1-1: config 0 interface 0 altsetting 0 has 1 endpoint descriptor,
different from the inte9
usb 1-1: New USB device found, idVendor=054c, idProduct=024b, bcdDevice= 0.00
usb 1-1: New USB device strings: Mfr=0, Product=0, SerialNumber=0
usb 1-1: config 0 descriptor??
sony 0003:054C:024B.0002: unknown main item tag 0x0
sony 0003:054C:024B.0002: unknown main item tag 0x2
sony 0003:054C:024B.0002: unknown main item tag 0x0
sony 0003:054C:024B.0002: unknown main item tag 0x0
...
sony 0003:054C:024B.0002: unknown main item tag 0x0
==================================================================
BUG: KASAN: use-after-free in usbhid_power+0xca/0xe0
Read of size 8 at addr ffff88805d590008 by task syz-executor/1808

CPU: 1 PID: 1808 Comm: syz-executor Not tainted 5.3.0-rc5+ #203
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014
Call Trace:
 __dump_stack lib/dump_stack.c:77
 dump_stack+0xca/0x13e lib/dump_stack.c:113
 print_address_description+0x6a/0x32c mm/kasan/report.c:351
 __kasan_report.cold+0x1a/0x33 mm/kasan/report.c:482
 kasan_report+0xe/0x12 mm/kasan/common.c:612
 usbhid_power+0xca/0xe0 drivers/hid/usbhid/hid-core.c:1234
 hid_hw_power ./include/linux/hid.h:1038
 hidraw_open+0x20d/0x740 drivers/hid/hidraw.c:282
 chrdev_open+0x219/0x5c0 fs/char_dev.c:414
 do_dentry_open+0x494/0x1120 fs/open.c:797
 do_last fs/namei.c:3416
 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 arch/x86/entry/entry_64.S:175
RIP: 0033:0x413a0e
Code: 89 54 24 08 e8 a3 f9 ff ff 8b 74 24 0c 48 8b 3c 24 41 89 c0 44
8b 54 24 08 b8 01 01 00 4
RSP: 002b:00007f7bf0a66730 EFLAGS: 00000293 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 6666666666666667 RCX: 0000000000413a0e
RDX: 0000000000000200 RSI: 00007f7bf0a66840 RDI: 00000000ffffff9c
RBP: 00007f7bf0a66840 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000293 R12: 00000000004a521c
R13: 00000000004ef7d0 R14: 00000000004ae881 R15: 00007f7bf0a676bc

Allocated by task 78:
 save_stack+0x1b/0x80 mm/kasan/common.c:69
 set_track mm/kasan/common.c:77
 __kasan_kmalloc mm/kasan/common.c:487
 __kasan_kmalloc.constprop.0+0xbf/0xd0 mm/kasan/common.c:460
 slab_post_alloc_hook mm/slab.h:520
 slab_alloc_node mm/slub.c:2770
 __kmalloc_node_track_caller+0xfc/0x380 mm/slub.c:4365
 __kmalloc_reserve.isra.0+0x39/0xe0 net/core/skbuff.c:141
 __alloc_skb+0xef/0x5a0 net/core/skbuff.c:209
 alloc_skb ./include/linux/skbuff.h:1055
 alloc_uevent_skb+0x7b/0x210 lib/kobject_uevent.c:289
 uevent_net_broadcast_untagged lib/kobject_uevent.c:325
 kobject_uevent_net_broadcast lib/kobject_uevent.c:408
 kobject_uevent_env+0x8ee/0x1160 lib/kobject_uevent.c:592
 device_del+0x6b2/0xb10 drivers/base/core.c:2349
 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
 hub_port_connect_change drivers/usb/core/hub.c:5213
 port_event drivers/usb/core/hub.c:5359
 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

Freed by task 242:
 save_stack+0x1b/0x80 mm/kasan/common.c:69
 set_track mm/kasan/common.c:77
 __kasan_slab_free+0x130/0x180 mm/kasan/common.c:449
 slab_free_hook mm/slub.c:1423
 slab_free_freelist_hook mm/slub.c:1474
 slab_free mm/slub.c:3016
 kfree+0xe4/0x2f0 mm/slub.c:3957
 skb_free_head+0x8b/0xa0 net/core/skbuff.c:591
 skb_release_data+0x41f/0x7c0 net/core/skbuff.c:611
 skb_release_all+0x46/0x60 net/core/skbuff.c:665
 __kfree_skb net/core/skbuff.c:679
 consume_skb net/core/skbuff.c:838
 consume_skb+0xd9/0x320 net/core/skbuff.c:832
 skb_free_datagram+0x16/0xf0 net/core/datagram.c:328
 netlink_recvmsg+0x65e/0xee0 net/netlink/af_netlink.c:1996
 sock_recvmsg_nosec net/socket.c:871
 sock_recvmsg net/socket.c:889
 sock_recvmsg+0xca/0x110 net/socket.c:885
 ___sys_recvmsg+0x271/0x5a0 net/socket.c:2480
 __sys_recvmsg+0xe9/0x1b0 net/socket.c:2537
 do_syscall_64+0xb7/0x580 arch/x86/entry/common.c:296
 entry_SYSCALL_64_after_hwframe+0x49/0xbe arch/x86/entry/entry_64.S:175

The buggy address belongs to the object at ffff88805d590000
 which belongs to the cache kmalloc-1k of size 1024
The buggy address is located 8 bytes inside of
 1024-byte region [ffff88805d590000, ffff88805d590400)
The buggy address belongs to the page:
page:ffffea0001756400 refcount:1 mapcount:0 mapping:ffff88806c402280
index:0x0 compound_mapco0
flags: 0x100000000010200(slab|head)
raw: 0100000000010200 dead000000000100 dead000000000122 ffff88806c402280
raw: 0000000000000000 00000000000e000e 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff88805d58ff00: fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe
 ffff88805d58ff80: fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe
>ffff88805d590000: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                      ^
 ffff88805d590080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff88805d590100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================

Re: [PATCH] HID: USB: Fix general protection fault caused by Logitech driver

[Alan Stern]

On Thu, 22 Aug 2019, Andrey Konovalov wrote:

> On Thu, Aug 22, 2019 at 7:11 PM Alan Stern <stern@rowland.harvard.edu> wrote:
> >
> > On Thu, 22 Aug 2019, Andrey Konovalov wrote:
> >
> > > Hi Alan,
> > >
> > > I've ran the fuzzer with your patches applied overnight and noticed
> > > another fallout of similar bugs. I think they are caused by a similar
> > > issue in the sony HID driver. There's no hid_hw_stop() call in the "if
> > > (!(hdev->claimed & HID_CLAIMED_INPUT))" case in sony_probe(). Does it
> > > look like a bug to you?
> >
> > It looks like the relevant hid_hw_stop() call is the one at the end of
> > sony_configure_input().  But I can't tell if doing that way is valid or
> > not -- in practice the code would end up calling hid_disconnect() while
> > hid_connect() was still running, which doesn't seem like a good idea.
> >
> > There's a comment about this near the end of sony_probe().  I suspect
> > it would be better to call hid_hw_stop() in the conditional code
> > following that comment rather than in sony_configure_input().
> >
> > Either way, these are all things Jiri should know about or check up on.
> >
> > Have you gotten any test results from syzbot exercising these pathways?
> > You ought to be able to tell which HID driver is involved by looking
> > through the console output.
> 
> Yes, a typical crash is below, that's why I thought it's the sony
> driver. Adding hid_hw_stop() in sony_probe() stops the issue from
> happening, but I don't know whether it's the right fix.

Probably you have to add hid_hw_stop() in sony_probe() and remove it 
from sony_configure_input().  But like I said above, Jiri should look 
into this.

Alan Stern

Re: [PATCH] HID: USB: Fix general protection fault caused by Logitech driver

[Jiri Kosina]

On Thu, 22 Aug 2019, Alan Stern wrote:

> > > > I've ran the fuzzer with your patches applied overnight and noticed
> > > > another fallout of similar bugs. I think they are caused by a similar
> > > > issue in the sony HID driver. There's no hid_hw_stop() call in the "if
> > > > (!(hdev->claimed & HID_CLAIMED_INPUT))" case in sony_probe(). Does it
> > > > look like a bug to you?
> > >
> > > It looks like the relevant hid_hw_stop() call is the one at the end of
> > > sony_configure_input().  But I can't tell if doing that way is valid or
> > > not -- in practice the code would end up calling hid_disconnect() while
> > > hid_connect() was still running, which doesn't seem like a good idea.
> > >
> > > There's a comment about this near the end of sony_probe().  I suspect
> > > it would be better to call hid_hw_stop() in the conditional code
> > > following that comment rather than in sony_configure_input().
> > >
> > > Either way, these are all things Jiri should know about or check up on.
> > >
> > > Have you gotten any test results from syzbot exercising these pathways?
> > > You ought to be able to tell which HID driver is involved by looking
> > > through the console output.
> > 
> > Yes, a typical crash is below, that's why I thought it's the sony
> > driver. Adding hid_hw_stop() in sony_probe() stops the issue from
> > happening, but I don't know whether it's the right fix.
> 
> Probably you have to add hid_hw_stop() in sony_probe() and remove it 
> from sony_configure_input().  But like I said above, Jiri should look 
> into this.

It almost certainly is, thanks.

Adding Roderick to CC ... Roderick, will you be able to test and submit 
a patch fixing that?

-- 
Jiri Kosina
SUSE Labs

RE: [PATCH] HID: USB: Fix general protection fault caused by Logitech driver

[Roderick.Colenbrander]

On Thu, 22 Aug 2019, Alan Stern wrote:

> > > > > I've ran the fuzzer with your patches applied overnight and noticed
> > > > > another fallout of similar bugs. I think they are caused by a similar
> > > > > issue in the sony HID driver. There's no hid_hw_stop() call in the "if
> > > > > (!(hdev->claimed & HID_CLAIMED_INPUT))" case in sony_probe(). Does it
> > > > > look like a bug to you?
> > > >
> > > > It looks like the relevant hid_hw_stop() call is the one at the end of
> > > > sony_configure_input().  But I can't tell if doing that way is valid or
> > > > not -- in practice the code would end up calling hid_disconnect() while
> > > > hid_connect() was still running, which doesn't seem like a good idea.
> > > >
> > > > There's a comment about this near the end of sony_probe().  I suspect
> > > > it would be better to call hid_hw_stop() in the conditional code
> > > > following that comment rather than in sony_configure_input().
> > > >
> > > > Either way, these are all things Jiri should know about or check up on.
> > > >
> > > > Have you gotten any test results from syzbot exercising these pathways?
> > > > You ought to be able to tell which HID driver is involved by looking
> > > > through the console output.
> > >
> > > Yes, a typical crash is below, that's why I thought it's the sony
> > > driver. Adding hid_hw_stop() in sony_probe() stops the issue from
> > > happening, but I don't know whether it's the right fix.
> >
> > Probably you have to add hid_hw_stop() in sony_probe() and remove it
> > from sony_configure_input().  But like I said above, Jiri should look
> > into this.

> It almost certainly is, thanks.

> Adding Roderick to CC ... Roderick, will you be able to test and submit
> a patch fixing that?
> 
> --
> Jiri Kosina
> SUSE Labs

Sure we will have a look and do some testing. Hopefully we can share a patch some time next week.

Thanks,
Roderick

Re: [PATCH] HID: USB: Fix general protection fault caused by Logitech driver

[Andrey Konovalov]

On Sat, Aug 24, 2019 at 2:41 AM <Roderick.Colenbrander@sony.com> wrote:
>
> On Thu, 22 Aug 2019, Alan Stern wrote:
>
> > > > > > I've ran the fuzzer with your patches applied overnight and noticed
> > > > > > another fallout of similar bugs. I think they are caused by a similar
> > > > > > issue in the sony HID driver. There's no hid_hw_stop() call in the "if
> > > > > > (!(hdev->claimed & HID_CLAIMED_INPUT))" case in sony_probe(). Does it
> > > > > > look like a bug to you?
> > > > >
> > > > > It looks like the relevant hid_hw_stop() call is the one at the end of
> > > > > sony_configure_input().  But I can't tell if doing that way is valid or
> > > > > not -- in practice the code would end up calling hid_disconnect() while
> > > > > hid_connect() was still running, which doesn't seem like a good idea.
> > > > >
> > > > > There's a comment about this near the end of sony_probe().  I suspect
> > > > > it would be better to call hid_hw_stop() in the conditional code
> > > > > following that comment rather than in sony_configure_input().
> > > > >
> > > > > Either way, these are all things Jiri should know about or check up on.
> > > > >
> > > > > Have you gotten any test results from syzbot exercising these pathways?
> > > > > You ought to be able to tell which HID driver is involved by looking
> > > > > through the console output.
> > > >
> > > > Yes, a typical crash is below, that's why I thought it's the sony
> > > > driver. Adding hid_hw_stop() in sony_probe() stops the issue from
> > > > happening, but I don't know whether it's the right fix.
> > >
> > > Probably you have to add hid_hw_stop() in sony_probe() and remove it
> > > from sony_configure_input().  But like I said above, Jiri should look
> > > into this.
>
> > It almost certainly is, thanks.
>
> > Adding Roderick to CC ... Roderick, will you be able to test and submit
> > a patch fixing that?
> >
> > --
> > Jiri Kosina
> > SUSE Labs
>
> Sure we will have a look and do some testing. Hopefully we can share a patch some time next week.

Hi Roderick,

I was wondering if you had a chance to look into this?

Once the Logitech fix is upstream, this similar Sony bug will start
producing a large number of similar syzbot reports since it causes a
major memory corruption and we'll need to triage them all again. It
would be nice to get the Sony fix merged together with the Logitech
one. Or at least to have it available so I can apply it manually until
it is merged.

Thanks!

RE: [PATCH] HID: USB: Fix general protection fault caused by Logitech driver

[Roderick.Colenbrander]

> From: Andrey Konovalov [andreyknvl@google.com]
> Sent: Tuesday, September 03, 2019 3:46 AM
> To: Colenbrander, Roderick
> Cc: Jiri Kosina; Alan Stern; Gustavo A. R. Silva; Hillf Danton; syzkaller-bugs; linux-input@vger.kernel.org; USB list
> Subject: Re: [PATCH] HID: USB: Fix general protection fault caused by Logitech driver

> On Sat, Aug 24, 2019 at 2:41 AM <Roderick.Colenbrander@sony.com> wrote:
>
> On Thu, 22 Aug 2019, Alan Stern wrote:
> >
> > > > > > > I've ran the fuzzer with your patches applied overnight and noticed
> > > > > > > another fallout of similar bugs. I think they are caused by a similar
> > > > > > > issue in the sony HID driver. There's no hid_hw_stop() call in the "if
> > > > > > > (!(hdev->claimed & HID_CLAIMED_INPUT))" case in sony_probe(). Does it
> > > > > > > look like a bug to you?
> > > > > >
> > > > > > It looks like the relevant hid_hw_stop() call is the one at the end of
> > > > > > sony_configure_input().  But I can't tell if doing that way is valid or
> > > > > > not -- in practice the code would end up calling hid_disconnect() while
> > > > > > hid_connect() was still running, which doesn't seem like a good idea.
> > > > > >
> > > > > > There's a comment about this near the end of sony_probe().  I suspect
> > > > > > it would be better to call hid_hw_stop() in the conditional code
> > > > > > following that comment rather than in sony_configure_input().
> > > > > >
> > > > > > Either way, these are all things Jiri should know about or check up on.
> > > > > >
> > > > > > Have you gotten any test results from syzbot exercising these pathways?
> > > > > > You ought to be able to tell which HID driver is involved by looking
> > > > > > through the console output.
> > > > >
> > > > > Yes, a typical crash is below, that's why I thought it's the sony
> > > > > driver. Adding hid_hw_stop() in sony_probe() stops the issue from
> > > > > happening, but I don't know whether it's the right fix.
> > > >
> > > > Probably you have to add hid_hw_stop() in sony_probe() and remove it
> > > > from sony_configure_input().  But like I said above, Jiri should look
> > > > into this.
> >
> > > It almost certainly is, thanks.
> >
> > > Adding Roderick to CC ... Roderick, will you be able to test and submit
> > > a patch fixing that?
> > >
> > > --
> > > Jiri Kosina
> > > SUSE Labs
> >
> > Sure we will have a look and do some testing. Hopefully we can share a patch some time next week.

> Hi Roderick,
> 
> I was wondering if you had a chance to look into this?
> 
> Once the Logitech fix is upstream, this similar Sony bug will start
> producing a large number of similar syzbot reports since it causes a
> major memory corruption and we'll need to triage them all again. It
> would be nice to get the Sony fix merged together with the Logitech
> one. Or at least to have it available so I can apply it manually until
> it is merged.
> 
> Thanks!

Hi Andrey,

We are still looking at the issue. I had one of my guys try the fix (and trigger an error in sony_input_configured), but he claimed he crashed his kernel. Due to the long weekend in the US, we didn't get back to looking at it yet. We are looking at it some more today or tomorrow.

Thanks,
Roderick

Re: WARNING in usbhid_raw_request/usb_submit_urb

[Dmitry Vyukov]

On Tue, Aug 13, 2019 at 6:27 AM Hillf Danton <hdanton@sina.com> wrote:
>
> [respin with the mess in Cc list cleaned up]
>
> On Mon, 12 Aug 2019 06:03:01 -0700
> > Hello,
> >
> > syzbot has tested the proposed patch but the reproducer still triggered crash:
> > KASAN: invalid-free in hcd_buffer_free
> >
> > usb 5-1: USB disconnect, device number 2
> > ==================================================================
> > BUG: KASAN: double-free or invalid-free in hcd_buffer_free+0x199/0x260
> > drivers/usb/core/buffer.c:165
> >
> > CPU: 0 PID: 1745 Comm: kworker/0:2 Not tainted 5.3.0-rc2+ #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
> >   print_address_description+0x6a/0x32c mm/kasan/report.c:351
> >   kasan_report_invalid_free+0x61/0xa0 mm/kasan/report.c:444
> >   __kasan_slab_free+0x162/0x180 mm/kasan/common.c:428
> >   slab_free_hook mm/slub.c:1423 [inline]
> >   slab_free_freelist_hook mm/slub.c:1470 [inline]
> >   slab_free mm/slub.c:3012 [inline]
> >   kfree+0xe4/0x2f0 mm/slub.c:3953
> >   hcd_buffer_free+0x199/0x260 drivers/usb/core/buffer.c:165
> >   usb_free_coherent+0x67/0x80 drivers/usb/core/usb.c:932
> >   hid_free_buffers.isra.0+0x94/0x290 drivers/hid/usbhid/hid-core.c:964
> >   usbhid_stop+0x308/0x450 drivers/hid/usbhid/hid-core.c:1224
> >   logi_dj_remove+0x107/0x210 drivers/hid/hid-logitech-dj.c:1797
> >   hid_device_remove+0xed/0x240 drivers/hid/hid-core.c:2242
> >   __device_release_driver drivers/base/dd.c:1118 [inline]
> >   device_release_driver_internal+0x206/0x4c0 drivers/base/dd.c:1151
> >   bus_remove_device+0x2dc/0x4a0 drivers/base/bus.c:556
> >   device_del+0x420/0xb10 drivers/base/core.c:2288
> >   hid_remove_device drivers/hid/hid-core.c:2413 [inline]
> >   hid_destroy_device+0xe1/0x150 drivers/hid/hid-core.c:2432
> >   usbhid_disconnect+0xad/0xd0 drivers/hid/usbhid/hid-core.c:1414
> >   usb_unbind_interface+0x1bd/0x8a0 drivers/usb/core/driver.c:423
> >   __device_release_driver drivers/base/dd.c:1120 [inline]
> >   device_release_driver_internal+0x404/0x4c0 drivers/base/dd.c:1151
> >   bus_remove_device+0x2dc/0x4a0 drivers/base/bus.c:556
> >   device_del+0x420/0xb10 drivers/base/core.c:2288
> >   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
> >   process_scheduled_works kernel/workqueue.c:2331 [inline]
> >   worker_thread+0x7ab/0xe20 kernel/workqueue.c:2417
> >   kthread+0x318/0x420 kernel/kthread.c:255
> >   ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352
> >
> > Allocated by task 1745:
> >   save_stack+0x1b/0x80 mm/kasan/common.c:69
> >   set_track mm/kasan/common.c:77 [inline]
> >   __kasan_kmalloc mm/kasan/common.c:487 [inline]
> >   __kasan_kmalloc.constprop.0+0xbf/0xd0 mm/kasan/common.c:460
> >   kmalloc include/linux/slab.h:557 [inline]
> >   hcd_buffer_alloc+0x1ca/0x290 drivers/usb/core/buffer.c:135
> >   usb_alloc_coherent+0x5d/0x80 drivers/usb/core/usb.c:910
> >   hid_alloc_buffers drivers/hid/usbhid/hid-core.c:846 [inline]
> >   usbhid_start+0x60b/0x22f0 drivers/hid/usbhid/hid-core.c:1075
> >   hid_hw_start+0x5d/0x130 drivers/hid/hid-core.c:1976
> >   logi_dj_probe+0x808/0xcd7 drivers/hid/hid-logitech-dj.c:1703
> >   hid_device_probe+0x2be/0x3f0 drivers/hid/hid-core.c:2209
> >   really_probe+0x281/0x650 drivers/base/dd.c:548
> >   driver_probe_device+0x101/0x1b0 drivers/base/dd.c:709
> >   __device_attach_driver+0x1c2/0x220 drivers/base/dd.c:816
> >   bus_for_each_drv+0x15c/0x1e0 drivers/base/bus.c:454
> >   __device_attach+0x217/0x360 drivers/base/dd.c:882
> >   bus_probe_device+0x1e4/0x290 drivers/base/bus.c:514
> >   device_add+0xae6/0x16f0 drivers/base/core.c:2114
> >   hid_add_device+0x33c/0x990 drivers/hid/hid-core.c:2365
> >   usbhid_probe+0xa81/0xfa0 drivers/hid/usbhid/hid-core.c:1386
> >   usb_probe_interface+0x305/0x7a0 drivers/usb/core/driver.c:361
> >   really_probe+0x281/0x650 drivers/base/dd.c:548
> >   driver_probe_device+0x101/0x1b0 drivers/base/dd.c:709
> >   __device_attach_driver+0x1c2/0x220 drivers/base/dd.c:816
> >   bus_for_each_drv+0x15c/0x1e0 drivers/base/bus.c:454
> >   __device_attach+0x217/0x360 drivers/base/dd.c:882
> >   bus_probe_device+0x1e4/0x290 drivers/base/bus.c:514
> >   device_add+0xae6/0x16f0 drivers/base/core.c:2114
> >   usb_set_configuration+0xdf6/0x1670 drivers/usb/core/message.c:2023
> >   generic_probe+0x9d/0xd5 drivers/usb/core/generic.c:210
> >   usb_probe_device+0x99/0x100 drivers/usb/core/driver.c:266
> >   really_probe+0x281/0x650 drivers/base/dd.c:548
> >   driver_probe_device+0x101/0x1b0 drivers/base/dd.c:709
> >   __device_attach_driver+0x1c2/0x220 drivers/base/dd.c:816
> >   bus_for_each_drv+0x15c/0x1e0 drivers/base/bus.c:454
> >   __device_attach+0x217/0x360 drivers/base/dd.c:882
> >   bus_probe_device+0x1e4/0x290 drivers/base/bus.c:514
> >   device_add+0xae6/0x16f0 drivers/base/core.c:2114
> >   usb_new_device.cold+0x6a4/0xe79 drivers/usb/core/hub.c:2536
> >   hub_port_connect drivers/usb/core/hub.c:5098 [inline]
> >   hub_port_connect_change drivers/usb/core/hub.c:5213 [inline]
> >   port_event drivers/usb/core/hub.c:5359 [inline]
> >   hub_event+0x1b5c/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
> >
> > Freed by task 1745:
> >   save_stack+0x1b/0x80 mm/kasan/common.c:69
> >   set_track mm/kasan/common.c:77 [inline]
> >   __kasan_slab_free+0x130/0x180 mm/kasan/common.c:449
> >   slab_free_hook mm/slub.c:1423 [inline]
> >   slab_free_freelist_hook mm/slub.c:1470 [inline]
> >   slab_free mm/slub.c:3012 [inline]
> >   kfree+0xe4/0x2f0 mm/slub.c:3953
> >   hcd_buffer_free+0x199/0x260 drivers/usb/core/buffer.c:165
> >   usb_free_coherent+0x67/0x80 drivers/usb/core/usb.c:932
> >   hid_free_buffers.isra.0+0x94/0x290 drivers/hid/usbhid/hid-core.c:964
> >   usbhid_stop+0x308/0x450 drivers/hid/usbhid/hid-core.c:1224
> >   usbhid_disconnect+0xa5/0xd0 drivers/hid/usbhid/hid-core.c:1413
> >   usb_unbind_interface+0x1bd/0x8a0 drivers/usb/core/driver.c:423
> >   __device_release_driver drivers/base/dd.c:1120 [inline]
> >   device_release_driver_internal+0x404/0x4c0 drivers/base/dd.c:1151
> >   bus_remove_device+0x2dc/0x4a0 drivers/base/bus.c:556
> >   device_del+0x420/0xb10 drivers/base/core.c:2288
> >   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
> >   process_scheduled_works kernel/workqueue.c:2331 [inline]
> >   worker_thread+0x7ab/0xe20 kernel/workqueue.c:2417
> >   kthread+0x318/0x420 kernel/kthread.c:255
> >   ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352
> >
> > The buggy address belongs to the object at ffff8881d5875500
> >   which belongs to the cache kmalloc-4k of size 4096
> > The buggy address is located 0 bytes inside of
> >   4096-byte region [ffff8881d5875500, ffff8881d5876500)
> > The buggy address belongs to the page:
> > page:ffffea0007561c00 refcount:1 mapcount:0 mapping:ffff8881da00c280
> > index:0x0 compound_mapcount: 0
> > flags: 0x200000000010200(slab|head)
> > raw: 0200000000010200 dead000000000100 dead000000000122 ffff8881da00c280
> > raw: 0000000000000000 0000000000070007 00000001ffffffff 0000000000000000
> > page dumped because: kasan: bad access detected
> >
> > Memory state around the buggy address:
> >   ffff8881d5875400: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
> >   ffff8881d5875480: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
> > > ffff8881d5875500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
> >                     ^
> >   ffff8881d5875580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
> >   ffff8881d5875600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
> > ==================================================================
> >
> >
> > Tested on:
> >
> > commit:         7f7867ff 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=13833b9a600000
> > kernel config:  https://syzkaller.appspot.com/x/.config?x=792eb47789f57810
> > compiler:       gcc (GCC) 9.0.0 20181231 (experimental)
> > patch:          https://syzkaller.appspot.com/x/patch.diff?x=167d2a0e600000
>
> Followup of commit e3e14de50dff ("HID: fix start/stop cycle in usbhid driver")
>
> --- a/drivers/hid/usbhid/hid-core.c
> +++ b/drivers/hid/usbhid/hid-core.c
> @@ -1214,6 +1214,8 @@ static void usbhid_stop(struct hid_devic
>
>         hid->claimed = 0;
>
> +       if (!usbhid->urbin) /* freeing buffers only once */
> +               return;

I have not read all the code, but the last report was a double-free,
which suggests that usbhid->urbin is actually not reset to NULL, so
this check won't help. Potentially we need both this check and reset
the fields to NULL after freeing.

>         usb_free_urb(usbhid->urbin);
>         usb_free_urb(usbhid->urbctrl);
>         usb_free_urb(usbhid->urbout);

Re: WARNING in usbhid_raw_request/usb_submit_urb

[Oliver Neukum]

Am Dienstag, den 13.08.2019, 12:26 +0800 schrieb Hillf Danton:
> [respin with the mess in Cc list cleaned up]

> Followup of commit e3e14de50dff ("HID: fix start/stop cycle in usbhid driver")
> 
> --- a/drivers/hid/usbhid/hid-core.c
> +++ b/drivers/hid/usbhid/hid-core.c
> @@ -1214,6 +1214,8 @@ static void usbhid_stop(struct hid_devic
>  
>  	hid->claimed = 0;
>  
> +	if (!usbhid->urbin) /* freeing buffers only once */
> +		return;
>  	usb_free_urb(usbhid->urbin);
>  	usb_free_urb(usbhid->urbctrl);
>  	usb_free_urb(usbhid->urbout);

This looks rather suspicious. Why is stop() called multiple times?
Do we have a refcounting issue? If not, what controls locking?

	Regards
		Oliver

general protection fault in __pm_runtime_resume

[syzbot]

Hello,

syzbot found the following crash on:

HEAD commit:    6a3599ce usb-fuzzer: main usb gadget fuzzer driver
git tree:       https://github.com/google/kasan.git usb-fuzzer
console output: https://syzkaller.appspot.com/x/log.txt?x=15562358600000
kernel config:  https://syzkaller.appspot.com/x/.config?x=700ca426ab83faae
dashboard link: https://syzkaller.appspot.com/bug?extid=3cbe5cd105d2ad56a1df
compiler:       gcc (GCC) 9.0.0 20181231 (experimental)

Unfortunately, I don't have any reproducer for this crash yet.

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+3cbe5cd105d2ad56a1df@syzkaller.appspotmail.com

kasan: CONFIG_KASAN_INLINE enabled
kasan: GPF could be caused by NULL-ptr deref or user memory access
general protection fault: 0000 [#1] SMP KASAN
CPU: 0 PID: 3715 Comm: syz-executor.3 Not tainted 5.2.0-rc6+ #15
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS  
Google 01/01/2011
RIP: 0010:__pm_runtime_resume+0x49/0x180 drivers/base/power/runtime.c:1069
Code: ed 74 d5 fe 45 85 ed 0f 85 9a 00 00 00 e8 6f 73 d5 fe 48 8d bd c1 02  
00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <0f> b6 04 02 48  
89 fa 83 e2 07 38 d0 7f 08 84 c0 0f 85 fe 00 00 00
RSP: 0018:ffff8881d99d78e0 EFLAGS: 00010202
RAX: dffffc0000000000 RBX: 0000000000000020 RCX: ffffc90003f3f000
RDX: 0000000416d8686d RSI: ffffffff82676841 RDI: 00000020b6c3436a
RBP: 00000020b6c340a9 R08: ffff8881c6d64800 R09: fffffbfff0e84c25
R10: ffff8881d99d7940 R11: ffffffff87426127 R12: 0000000000000004
R13: 0000000000000000 R14: ffff8881d9b94000 R15: ffffffff897f9048
FS:  00007f047f542700(0000) GS:ffff8881db200000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b30f21000 CR3: 00000001ca032000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
  pm_runtime_get_sync include/linux/pm_runtime.h:226 [inline]
  usb_autopm_get_interface+0x1b/0x50 drivers/usb/core/driver.c:1707
  usbhid_power+0x7c/0xe0 drivers/hid/usbhid/hid-core.c:1234
  hid_hw_power include/linux/hid.h:1038 [inline]
  hidraw_open+0x20d/0x740 drivers/hid/hidraw.c:282
  chrdev_open+0x219/0x5c0 fs/char_dev.c:413
  do_dentry_open+0x497/0x1040 fs/open.c:778
  do_last fs/namei.c:3416 [inline]
  path_openat+0x1430/0x3ff0 fs/namei.c:3533
  do_filp_open+0x1a1/0x280 fs/namei.c:3563
  do_sys_open+0x3c0/0x580 fs/open.c:1070
  do_syscall_64+0xb7/0x560 arch/x86/entry/common.c:301
  entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x413711
Code: 75 14 b8 02 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 04 19 00 00 c3 48  
83 ec 08 e8 0a fa ff ff 48 89 04 24 b8 02 00 00 00 0f 05 <48> 8b 3c 24 48  
89 c2 e8 53 fa ff ff 48 89 d0 48 83 c4 08 48 3d 01
RSP: 002b:00007f047f5417a0 EFLAGS: 00000293 ORIG_RAX: 0000000000000002
RAX: ffffffffffffffda RBX: 6666666666666667 RCX: 0000000000413711
RDX: 0000000000000000 RSI: 0000000000084002 RDI: 00007f047f541850
RBP: 000000000075bf20 R08: 000000000000000f R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000293 R12: 00007f047f5426d4
R13: 00000000004c8a7a R14: 00000000004df748 R15: 00000000ffffffff
Modules linked in:
---[ end trace a2dcf3f649bfec9a ]---
RIP: 0010:__pm_runtime_resume+0x49/0x180 drivers/base/power/runtime.c:1069
Code: ed 74 d5 fe 45 85 ed 0f 85 9a 00 00 00 e8 6f 73 d5 fe 48 8d bd c1 02  
00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <0f> b6 04 02 48  
89 fa 83 e2 07 38 d0 7f 08 84 c0 0f 85 fe 00 00 00
RSP: 0018:ffff8881d99d78e0 EFLAGS: 00010202
RAX: dffffc0000000000 RBX: 0000000000000020 RCX: ffffc90003f3f000
RDX: 0000000416d8686d RSI: ffffffff82676841 RDI: 00000020b6c3436a
RBP: 00000020b6c340a9 R08: ffff8881c6d64800 R09: fffffbfff0e84c25
R10: ffff8881d99d7940 R11: ffffffff87426127 R12: 0000000000000004
R13: 0000000000000000 R14: ffff8881d9b94000 R15: ffffffff897f9048
FS:  00007f047f542700(0000) GS:ffff8881db200000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b30f21000 CR3: 00000001ca032000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400


---
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@googlegroups.com.

syzbot will keep track of this bug report. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.

Re: general protection fault in __pm_runtime_resume

[syzbot]

syzbot has found a reproducer for the following crash on:

HEAD commit:    6a3599ce usb-fuzzer: main usb gadget fuzzer driver
git tree:       https://github.com/google/kasan.git usb-fuzzer
console output: https://syzkaller.appspot.com/x/log.txt?x=108edb68600000
kernel config:  https://syzkaller.appspot.com/x/.config?x=700ca426ab83faae
dashboard link: https://syzkaller.appspot.com/bug?extid=3cbe5cd105d2ad56a1df
compiler:       gcc (GCC) 9.0.0 20181231 (experimental)
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=13f0b4c8600000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=172d8758600000

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+3cbe5cd105d2ad56a1df@syzkaller.appspotmail.com

kasan: CONFIG_KASAN_INLINE enabled
kasan: GPF could be caused by NULL-ptr deref or user memory access
general protection fault: 0000 [#1] SMP KASAN
CPU: 0 PID: 1740 Comm: syz-executor618 Not tainted 5.2.0-rc6+ #15
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS  
Google 01/01/2011
RIP: 0010:__pm_runtime_resume+0x49/0x180 drivers/base/power/runtime.c:1069
Code: ed 74 d5 fe 45 85 ed 0f 85 9a 00 00 00 e8 6f 73 d5 fe 48 8d bd c1 02  
00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <0f> b6 04 02 48  
89 fa 83 e2 07 38 d0 7f 08 84 c0 0f 85 fe 00 00 00
RSP: 0018:ffff8881cf5878e0 EFLAGS: 00010202
RAX: dffffc0000000000 RBX: 0000000000000020 RCX: ffffffff82676833
RDX: 000000021d463be5 RSI: ffffffff82676841 RDI: 00000010ea31df2b
RBP: 00000010ea31dc6a R08: ffff8881d1b7e000 R09: fffffbfff0e84c25
R10: ffff8881cf587940 R11: ffffffff87426127 R12: 0000000000000004
R13: 0000000000000000 R14: ffff8881cfd7a500 R15: ffffffff897f9040
FS:  0000555555808880(0000) GS:ffff8881db200000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000000043f760 CR3: 00000001d0f29000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
  pm_runtime_get_sync include/linux/pm_runtime.h:226 [inline]
  usb_autopm_get_interface+0x1b/0x50 drivers/usb/core/driver.c:1707
  usbhid_power+0x7c/0xe0 drivers/hid/usbhid/hid-core.c:1234
  hid_hw_power include/linux/hid.h:1038 [inline]
  hidraw_open+0x20d/0x740 drivers/hid/hidraw.c:282
  chrdev_open+0x219/0x5c0 fs/char_dev.c:413
  do_dentry_open+0x497/0x1040 fs/open.c:778
  do_last fs/namei.c:3416 [inline]
  path_openat+0x1430/0x3ff0 fs/namei.c:3533
  do_filp_open+0x1a1/0x280 fs/namei.c:3563
  do_sys_open+0x3c0/0x580 fs/open.c:1070
  do_syscall_64+0xb7/0x560 arch/x86/entry/common.c:301
  entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x401ad0
Code: 01 f0 ff ff 0f 83 c0 0b 00 00 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f  
44 00 00 83 3d fd 5b 2d 00 00 75 14 b8 02 00 00 00 0f 05 <48> 3d 01 f0 ff  
ff 0f 83 94 0b 00 00 c3 48 83 ec 08 e8 fa 00 00 00
RSP: 002b:00007ffed8d15738 EFLAGS: 00000246 ORIG_RAX: 0000000000000002
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000401ad0
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00007ffed8d15740
RBP: 6666666666666667 R08: 000000000000000f R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000402af0
R13: 0000000000402b80 R14: 0000000000000000 R15: 0000000000000000
Modules linked in:
---[ end trace 60987a9feed42828 ]---
RIP: 0010:__pm_runtime_resume+0x49/0x180 drivers/base/power/runtime.c:1069
Code: ed 74 d5 fe 45 85 ed 0f 85 9a 00 00 00 e8 6f 73 d5 fe 48 8d bd c1 02  
00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <0f> b6 04 02 48  
89 fa 83 e2 07 38 d0 7f 08 84 c0 0f 85 fe 00 00 00
RSP: 0018:ffff8881cf5878e0 EFLAGS: 00010202
RAX: dffffc0000000000 RBX: 0000000000000020 RCX: ffffffff82676833
RDX: 000000021d463be5 RSI: ffffffff82676841 RDI: 00000010ea31df2b
RBP: 00000010ea31dc6a R08: ffff8881d1b7e000 R09: fffffbfff0e84c25
R10: ffff8881cf587940 R11: ffffffff87426127 R12: 0000000000000004
R13: 0000000000000000 R14: ffff8881cfd7a500 R15: ffffffff897f9040
FS:  0000555555808880(0000) GS:ffff8881db200000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000000043f760 CR3: 00000001d0f29000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400

Re: general protection fault in __pm_runtime_resume

[Andrey Konovalov]

[-- Attachment #1: Type: text/plain, Size: 4692 bytes --]

On Thu, Jul 25, 2019 at 7:04 AM syzbot
<syzbot+3cbe5cd105d2ad56a1df@syzkaller.appspotmail.com> wrote:
>
> syzbot has found a reproducer for the following crash on:
>
> HEAD commit:    6a3599ce usb-fuzzer: main usb gadget fuzzer driver
> git tree:       https://github.com/google/kasan.git usb-fuzzer
> console output: https://syzkaller.appspot.com/x/log.txt?x=108edb68600000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=700ca426ab83faae
> dashboard link: https://syzkaller.appspot.com/bug?extid=3cbe5cd105d2ad56a1df
> compiler:       gcc (GCC) 9.0.0 20181231 (experimental)
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=13f0b4c8600000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=172d8758600000
>
> IMPORTANT: if you fix the bug, please add the following tag to the commit:
> Reported-by: syzbot+3cbe5cd105d2ad56a1df@syzkaller.appspotmail.com
>
> kasan: CONFIG_KASAN_INLINE enabled
> kasan: GPF could be caused by NULL-ptr deref or user memory access
> general protection fault: 0000 [#1] SMP KASAN
> CPU: 0 PID: 1740 Comm: syz-executor618 Not tainted 5.2.0-rc6+ #15
> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
> Google 01/01/2011
> RIP: 0010:__pm_runtime_resume+0x49/0x180 drivers/base/power/runtime.c:1069
> Code: ed 74 d5 fe 45 85 ed 0f 85 9a 00 00 00 e8 6f 73 d5 fe 48 8d bd c1 02
> 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <0f> b6 04 02 48
> 89 fa 83 e2 07 38 d0 7f 08 84 c0 0f 85 fe 00 00 00
> RSP: 0018:ffff8881cf5878e0 EFLAGS: 00010202
> RAX: dffffc0000000000 RBX: 0000000000000020 RCX: ffffffff82676833
> RDX: 000000021d463be5 RSI: ffffffff82676841 RDI: 00000010ea31df2b
> RBP: 00000010ea31dc6a R08: ffff8881d1b7e000 R09: fffffbfff0e84c25
> R10: ffff8881cf587940 R11: ffffffff87426127 R12: 0000000000000004
> R13: 0000000000000000 R14: ffff8881cfd7a500 R15: ffffffff897f9040
> FS:  0000555555808880(0000) GS:ffff8881db200000(0000) knlGS:0000000000000000
> CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> CR2: 000000000043f760 CR3: 00000001d0f29000 CR4: 00000000001406f0
> DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
> Call Trace:
>   pm_runtime_get_sync include/linux/pm_runtime.h:226 [inline]
>   usb_autopm_get_interface+0x1b/0x50 drivers/usb/core/driver.c:1707
>   usbhid_power+0x7c/0xe0 drivers/hid/usbhid/hid-core.c:1234
>   hid_hw_power include/linux/hid.h:1038 [inline]
>   hidraw_open+0x20d/0x740 drivers/hid/hidraw.c:282
>   chrdev_open+0x219/0x5c0 fs/char_dev.c:413
>   do_dentry_open+0x497/0x1040 fs/open.c:778
>   do_last fs/namei.c:3416 [inline]
>   path_openat+0x1430/0x3ff0 fs/namei.c:3533
>   do_filp_open+0x1a1/0x280 fs/namei.c:3563
>   do_sys_open+0x3c0/0x580 fs/open.c:1070
>   do_syscall_64+0xb7/0x560 arch/x86/entry/common.c:301
>   entry_SYSCALL_64_after_hwframe+0x49/0xbe
> RIP: 0033:0x401ad0
> Code: 01 f0 ff ff 0f 83 c0 0b 00 00 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f
> 44 00 00 83 3d fd 5b 2d 00 00 75 14 b8 02 00 00 00 0f 05 <48> 3d 01 f0 ff
> ff 0f 83 94 0b 00 00 c3 48 83 ec 08 e8 fa 00 00 00
> RSP: 002b:00007ffed8d15738 EFLAGS: 00000246 ORIG_RAX: 0000000000000002
> RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000401ad0
> RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00007ffed8d15740
> RBP: 6666666666666667 R08: 000000000000000f R09: 0000000000000000
> R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000402af0
> R13: 0000000000402b80 R14: 0000000000000000 R15: 0000000000000000
> Modules linked in:
> ---[ end trace 60987a9feed42828 ]---
> RIP: 0010:__pm_runtime_resume+0x49/0x180 drivers/base/power/runtime.c:1069
> Code: ed 74 d5 fe 45 85 ed 0f 85 9a 00 00 00 e8 6f 73 d5 fe 48 8d bd c1 02
> 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <0f> b6 04 02 48
> 89 fa 83 e2 07 38 d0 7f 08 84 c0 0f 85 fe 00 00 00
> RSP: 0018:ffff8881cf5878e0 EFLAGS: 00010202
> RAX: dffffc0000000000 RBX: 0000000000000020 RCX: ffffffff82676833
> RDX: 000000021d463be5 RSI: ffffffff82676841 RDI: 00000010ea31df2b
> RBP: 00000010ea31dc6a R08: ffff8881d1b7e000 R09: fffffbfff0e84c25
> R10: ffff8881cf587940 R11: ffffffff87426127 R12: 0000000000000004
> R13: 0000000000000000 R14: ffff8881cfd7a500 R15: ffffffff897f9040
> FS:  0000555555808880(0000) GS:ffff8881db200000(0000) knlGS:0000000000000000
> CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> CR2: 000000000043f760 CR3: 00000001d0f29000 CR4: 00000000001406f0
> DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
>

Let's try Hillf's patch here as well:

#syz test: https://github.com/google/kasan.git 6a3599ce

[-- Attachment #2: hid-core.patch --]
[-- Type: application/x-patch, Size: 351 bytes --]

Re: general protection fault in __pm_runtime_resume

[syzbot]

Hello,

syzbot has tested the proposed patch and the reproducer did not trigger  
crash:

Reported-and-tested-by:  
syzbot+3cbe5cd105d2ad56a1df@syzkaller.appspotmail.com

Tested on:

commit:         6a3599ce usb-fuzzer: main usb gadget fuzzer driver
git tree:       https://github.com/google/kasan.git
kernel config:  https://syzkaller.appspot.com/x/.config?x=700ca426ab83faae
compiler:       gcc (GCC) 9.0.0 20181231 (experimental)
patch:          https://syzkaller.appspot.com/x/patch.diff?x=1341679a600000

Note: testing is done by a robot and is best-effort only.