linux-kernel - Re: [syzbot] [usb?] KMSAN: kernel-usb-infoleak-after-free in usb_start_wait

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Message-ID: <6869795c.a00a0220.c7b3.0048.GAE@google.com>
Date: Sat, 05 Jul 2025 12:13:32 -0700
From: syzbot <syzbot+27fe438b6370f95de4a5@...kaller.appspotmail.com>
To: 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-after-free in usb_start_wait_urb

syzbot has found a reproducer for the following issue on:

HEAD commit:    a79a588fc176 Merge tag 'pm-6.16-rc5' of git://git.kernel.o..
git tree:       upstream
console+strace: https://syzkaller.appspot.com/x/log.txt?x=16942f70580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=aa9af7332485152e
dashboard link: https://syzkaller.appspot.com/bug?extid=27fe438b6370f95de4a5
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=11132582580000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=10709c8c580000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/b7cf1187020f/disk-a79a588f.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/47e08d61ef4b/vmlinux-a79a588f.xz
kernel image: https://storage.googleapis.com/syzbot-assets/75d3bcd3c8e0/bzImage-a79a588f.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+27fe438b6370f95de4a5@...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-after-free 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]
 hidinput_connect+0x3bf5/0x5cc0 drivers/hid/hid-input.c:2327
 hid_connect+0x6b4/0x3440 drivers/hid/hid-core.c:2239
 hid_hw_start+0xfc/0x1e0 drivers/hid/hid-core.c:2354
 ms_probe+0x2e5/0x890 drivers/hid/hid-microsoft.c:391
 __hid_device_probe drivers/hid/hid-core.c:2724 [inline]
 hid_device_probe+0x536/0xab0 drivers/hid/hid-core.c:2761
 call_driver_probe drivers/base/dd.c:-1 [inline]
 really_probe+0x4d1/0xd90 drivers/base/dd.c:657
 __driver_probe_device+0x268/0x380 drivers/base/dd.c:799
 driver_probe_device+0x70/0x8b0 drivers/base/dd.c:829
 __device_attach_driver+0x4ee/0x950 drivers/base/dd.c:957
 bus_for_each_drv+0x3e3/0x680 drivers/base/bus.c:462
 __device_attach+0x3c8/0x5c0 drivers/base/dd.c:1029
 device_initial_probe+0x33/0x40 drivers/base/dd.c:1078
 bus_probe_device+0x3ba/0x5e0 drivers/base/bus.c:537
 device_add+0x12a9/0x1c10 drivers/base/core.c:3692
 hid_add_device+0x5ed/0x7b0 drivers/hid/hid-core.c:2907
 usbhid_probe+0x1fec/0x2660 drivers/hid/usbhid/hid-core.c:1435
 usb_probe_interface+0xd04/0x1310 drivers/usb/core/driver.c:396
 call_driver_probe drivers/base/dd.c:-1 [inline]
 really_probe+0x4d1/0xd90 drivers/base/dd.c:657
 __driver_probe_device+0x268/0x380 drivers/base/dd.c:799
 driver_probe_device+0x70/0x8b0 drivers/base/dd.c:829
 __device_attach_driver+0x4ee/0x950 drivers/base/dd.c:957
 bus_for_each_drv+0x3e3/0x680 drivers/base/bus.c:462
 __device_attach+0x3c8/0x5c0 drivers/base/dd.c:1029
 device_initial_probe+0x33/0x40 drivers/base/dd.c:1078
 bus_probe_device+0x3ba/0x5e0 drivers/base/bus.c:537
 device_add+0x12a9/0x1c10 drivers/base/core.c:3692
 usb_set_configuration+0x3493/0x3b70 drivers/usb/core/message.c:2210
 usb_generic_driver_probe+0xfc/0x290 drivers/usb/core/generic.c:250
 usb_probe_device+0x38a/0x690 drivers/usb/core/driver.c:291
 call_driver_probe drivers/base/dd.c:-1 [inline]
 really_probe+0x4d1/0xd90 drivers/base/dd.c:657
 __driver_probe_device+0x268/0x380 drivers/base/dd.c:799
 driver_probe_device+0x70/0x8b0 drivers/base/dd.c:829
 __device_attach_driver+0x4ee/0x950 drivers/base/dd.c:957
 bus_for_each_drv+0x3e3/0x680 drivers/base/bus.c:462
 __device_attach+0x3c8/0x5c0 drivers/base/dd.c:1029
 device_initial_probe+0x33/0x40 drivers/base/dd.c:1078
 bus_probe_device+0x3ba/0x5e0 drivers/base/bus.c:537
 device_add+0x12a9/0x1c10 drivers/base/core.c:3692
 usb_new_device+0x104b/0x20c0 drivers/usb/core/hub.c:2694
 hub_port_connect drivers/usb/core/hub.c:5566 [inline]
 hub_port_connect_change drivers/usb/core/hub.c:5706 [inline]
 port_event drivers/usb/core/hub.c:5866 [inline]
 hub_event+0x5588/0x7580 drivers/usb/core/hub.c:5948
 process_one_work kernel/workqueue.c:3238 [inline]
 process_scheduled_works+0xb8e/0x1d80 kernel/workqueue.c:3321
 worker_thread+0xedf/0x1590 kernel/workqueue.c:3402
 kthread+0xd5c/0xf00 kernel/kthread.c:464
 ret_from_fork+0x1e0/0x310 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245

Uninit was created at:
 free_pages_prepare mm/page_alloc.c:1173 [inline]
 __free_frozen_pages+0x179/0x1560 mm/page_alloc.c:2706
 free_frozen_pages+0x21/0x30 mm/page_alloc.c:2744
 __folio_put+0x435/0x460 mm/swap.c:112
 folio_put include/linux/mm.h:1356 [inline]
 put_page include/linux/mm.h:1425 [inline]
 anon_pipe_put_page+0x32e/0x620 fs/pipe.c:139
 anon_pipe_buf_release+0x39/0x50 fs/pipe.c:147
 pipe_buf_release include/linux/pipe_fs_i.h:282 [inline]
 pipe_update_tail fs/pipe.c:242 [inline]
 anon_pipe_read+0xaef/0x1e80 fs/pipe.c:361
 new_sync_read fs/read_write.c:491 [inline]
 vfs_read+0x857/0xf00 fs/read_write.c:572
 ksys_read fs/read_write.c:715 [inline]
 __do_sys_read fs/read_write.c:724 [inline]
 __se_sys_read fs/read_write.c:722 [inline]
 __x64_sys_read+0x1fb/0x4d0 fs/read_write.c:722
 x64_sys_call+0x39db/0x3db0 arch/x86/include/generated/asm/syscalls_64.h:1
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xd9/0x210 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Bytes 2727-6822 of 65535 are uninitialized
Memory access of size 65535 starts at ffff88811b772559

CPU: 0 UID: 0 PID: 11 Comm: kworker/0:1 Not tainted 6.16.0-rc4-syzkaller-00308-ga79a588fc176 #0 PREEMPT(undef) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
Workqueue: usb_hub_wq hub_event
=====================================================


---
If you want syzbot to run the reproducer, reply with:
#syz test: git://repo/address.git branch-or-commit-hash
If you attach or paste a git patch, syzbot will apply it before testing.