linux-kernel - Re: [syzbot] [usb?] KMSAN: kernel-usb-infoleak in usbhid_raw

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Message-ID: <e8fe21fa-9a2f-4def-b659-063d55a40f3d@rowland.harvard.edu>
Date: Sun, 13 Jul 2025 15:19:34 -0400
From: Alan Stern <stern@...land.harvard.edu>
To: syzbot <syzbot+fbe9fff1374eefadffb9@...kaller.appspotmail.com>
Cc: gregkh@...uxfoundation.org, linux-kernel@...r.kernel.org,
	linux-usb@...r.kernel.org, syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [usb?] KMSAN: kernel-usb-infoleak in usbhid_raw_request

On Sun, Jul 13, 2025 at 05:09:33AM -0700, syzbot wrote:
> syzbot has found a reproducer for the following issue on:
> 
> HEAD commit:    3f31a806a62e Merge tag 'mm-hotfixes-stable-2025-07-11-16-1..
> git tree:       upstream
> console output: https://syzkaller.appspot.com/x/log.txt?x=14725d82580000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=76c2fb9aa0954fb8
> dashboard link: https://syzkaller.appspot.com/bug?extid=fbe9fff1374eefadffb9
> compiler:       Debian clang version 20.1.7 (++20250616065708+6146a88f6049-1~exp1~20250616065826.132), Debian LLD 20.1.7
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=118f50f0580000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=12725d82580000
> 
> Downloadable assets:
> disk image: https://storage.googleapis.com/syzbot-assets/33ae17bacfc2/disk-3f31a806.raw.xz
> vmlinux: https://storage.googleapis.com/syzbot-assets/f476e6d9400a/vmlinux-3f31a806.xz
> kernel image: https://storage.googleapis.com/syzbot-assets/9ae9e3684ea3/bzImage-3f31a806.xz
> 
> IMPORTANT: if you fix the issue, please add the following tag to the commit:
> Reported-by: syzbot+fbe9fff1374eefadffb9@...kaller.appspotmail.com
> 
> microsoft 0003:045E:07DA.0001: unknown main item tag 0x0
> microsoft 0003:045E:07DA.0001: ignoring exceeding usage max
> =====================================================
> BUG: KMSAN: kernel-usb-infoleak in usb_submit_urb+0x5a1/0x2630 drivers/usb/core/urb.c:430
>  usb_submit_urb+0x5a1/0x2630 drivers/usb/core/urb.c:430
>  usb_start_wait_urb+0xc2/0x320 drivers/usb/core/message.c:59
>  usb_internal_control_msg drivers/usb/core/message.c:103 [inline]
>  usb_control_msg+0x27c/0x5b0 drivers/usb/core/message.c:154
>  usbhid_raw_request+0x4ab/0x690 drivers/hid/usbhid/hid-core.c:-1
>  __hid_request+0x2bd/0x500 drivers/hid/hid-core.c:1989
>  hidinput_change_resolution_multipliers drivers/hid/hid-input.c:1950 [inline]

Try again, but with Benjamin Tissoires's recent patches.

#syz test: git://git.kernel.org/pub/scm/linux/kernel/git/hid c2ca42f190b6

Alan Stern