[syzbot] [usb?] KASAN: slab-out-of-bounds Read in mon_copy_to_buff

syzbot
2025-07-07T11:40:25Z

Hello,

syzbot found the following issue on:

HEAD commit: b4911fb0b060 Merge tag 'mmc-v6.16-rc1' of git://git.kernel..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=1681f982580000
kernel config: https://syzkaller.appspot.com/x/.config?x=8b0724e6945b4773
dashboard link: https://syzkaller.appspot.com/bug?extid=8258d5439c49d4c35f43
compiler: gcc (Debian 12.2.0-14+deb12u1) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40

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

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/4347c5e481b1/disk-b4911fb0.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/94e212cacf21/vmlinux-b4911fb0.xz
kernel image: https://storage.googleapis.com/syzbot-assets/8e0269b32eb1/bzImage-b4911fb0.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+8258d5439c49d4c35f43@syzkaller.appspotmail.com

microsoft 0003:045E:07DA.000D: unknown main item tag 0x0
microsoft 0003:045E:07DA.000D: unknown main item tag 0x0
microsoft 0003:045E:07DA.000D: unknown main item tag 0x0
microsoft 0003:045E:07DA.000D: unknown main item tag 0x0
microsoft 0003:045E:07DA.000D: unknown main item tag 0x0
microsoft 0003:045E:07DA.000D: unknown main item tag 0x0
==================================================================
BUG: KASAN: slab-out-of-bounds in mon_copy_to_buff+0xc2/0x170 drivers/usb/mon/mon_bin.c:252
Read of size 4032 at addr ffff8880330e0801 by task kworker/0:6/5887

CPU: 0 UID: 0 PID: 5887 Comm: kworker/0:6 Not tainted 6.16.0-rc4-syzkaller-00049-gb4911fb0b060 #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
Workqueue: usb_hub_wq hub_event
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:94 [inline]
dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120
print_address_description mm/kasan/report.c:408 [inline]
print_report+0xcd/0x680 mm/kasan/report.c:521
kasan_report+0xe0/0x110 mm/kasan/report.c:634
check_region_inline mm/kasan/generic.c:183 [inline]
kasan_check_range+0x100/0x1b0 mm/kasan/generic.c:189
__asan_memcpy+0x23/0x60 mm/kasan/shadow.c:105
mon_copy_to_buff+0xc2/0x170 drivers/usb/mon/mon_bin.c:252
mon_bin_get_data drivers/usb/mon/mon_bin.c:420 [inline]
mon_bin_event+0x1071/0x2050 drivers/usb/mon/mon_bin.c:606
mon_bus_submit+0xcf/0x140 drivers/usb/mon/mon_main.c:89
usbmon_urb_submit include/linux/usb/hcd.h:724 [inline]
usb_hcd_submit_urb+0x12d/0x1c60 drivers/usb/core/hcd.c:1518
usb_submit_urb+0x87c/0x1790 drivers/usb/core/urb.c:581
usb_start_wait_urb+0x104/0x4b0 drivers/usb/core/message.c:59
usb_internal_control_msg drivers/usb/core/message.c:103 [inline]
usb_control_msg+0x326/0x4a0 drivers/usb/core/message.c:154
usbhid_set_raw_report drivers/hid/usbhid/hid-core.c:928 [inline]
usbhid_raw_request+0x58f/0x700 drivers/hid/usbhid/hid-core.c:1299
__hid_request+0x299/0x3c0 drivers/hid/hid-core.c:1989
hidinput_change_resolution_multipliers drivers/hid/hid-input.c:1950 [inline]
hidinput_connect+0x1ada/0x2bd0 drivers/hid/hid-input.c:2327
hid_connect+0x13f3/0x1a60 drivers/hid/hid-core.c:2239
hid_hw_start drivers/hid/hid-core.c:2354 [inline]
hid_hw_start+0xaa/0x140 drivers/hid/hid-core.c:2345
ms_probe+0x195/0x500 drivers/hid/hid-microsoft.c:391
__hid_device_probe drivers/hid/hid-core.c:2724 [inline]
hid_device_probe+0x363/0x720 drivers/hid/hid-core.c:2761
call_driver_probe drivers/base/dd.c:579 [inline]
really_probe+0x241/0xa90 drivers/base/dd.c:657
__driver_probe_device+0x1de/0x440 drivers/base/dd.c:799
driver_probe_device+0x4c/0x1b0 drivers/base/dd.c:829
__device_attach_driver+0x1df/0x310 drivers/base/dd.c:957
bus_for_each_drv+0x159/0x1e0 drivers/base/bus.c:462
__device_attach+0x1e4/0x4b0 drivers/base/dd.c:1029
bus_probe_device+0x17f/0x1c0 drivers/base/bus.c:537
device_add+0x1148/0x1a70 drivers/base/core.c:3692
hid_add_device+0x373/0xa60 drivers/hid/hid-core.c:2907
usbhid_probe+0xd38/0x13f0 drivers/hid/usbhid/hid-core.c:1435
usb_probe_interface+0x300/0x9c0 drivers/usb/core/driver.c:396
call_driver_probe drivers/base/dd.c:579 [inline]
really_probe+0x241/0xa90 drivers/base/dd.c:657
__driver_probe_device+0x1de/0x440 drivers/base/dd.c:799
driver_probe_device+0x4c/0x1b0 drivers/base/dd.c:829
__device_attach_driver+0x1df/0x310 drivers/base/dd.c:957
bus_for_each_drv+0x159/0x1e0 drivers/base/bus.c:462
__device_attach+0x1e4/0x4b0 drivers/base/dd.c:1029
bus_probe_device+0x17f/0x1c0 drivers/base/bus.c:537
device_add+0x1148/0x1a70 drivers/base/core.c:3692
usb_set_configuration+0x1187/0x1e20 drivers/usb/core/message.c:2210
usb_generic_driver_probe+0xb1/0x110 drivers/usb/core/generic.c:250
usb_probe_device+0xec/0x3e0 drivers/usb/core/driver.c:291
call_driver_probe drivers/base/dd.c:579 [inline]
really_probe+0x241/0xa90 drivers/base/dd.c:657
__driver_probe_device+0x1de/0x440 drivers/base/dd.c:799
driver_probe_device+0x4c/0x1b0 drivers/base/dd.c:829
__device_attach_driver+0x1df/0x310 drivers/base/dd.c:957
bus_for_each_drv+0x159/0x1e0 drivers/base/bus.c:462
__device_attach+0x1e4/0x4b0 drivers/base/dd.c:1029
bus_probe_device+0x17f/0x1c0 drivers/base/bus.c:537
device_add+0x1148/0x1a70 drivers/base/core.c:3692
usb_new_device+0xd07/0x1a20 drivers/usb/core/hub.c:2663
hub_port_connect drivers/usb/core/hub.c:5535 [inline]
hub_port_connect_change drivers/usb/core/hub.c:5675 [inline]
port_event drivers/usb/core/hub.c:5835 [inline]
hub_event+0x2eb7/0x4fa0 drivers/usb/core/hub.c:5917
process_one_work+0x9cf/0x1b70 kernel/workqueue.c:3238
process_scheduled_works kernel/workqueue.c:3321 [inline]
worker_thread+0x6c8/0xf10 kernel/workqueue.c:3402
kthread+0x3c2/0x780 kernel/kthread.c:464
ret_from_fork+0x5d4/0x6f0 arch/x86/kernel/process.c:148
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
</TASK>

Allocated by task 5887:
kasan_save_stack+0x33/0x60 mm/kasan/common.c:47
kasan_save_track+0x14/0x30 mm/kasan/common.c:68
poison_kmalloc_redzone mm/kasan/common.c:377 [inline]
__kasan_kmalloc+0xaa/0xb0 mm/kasan/common.c:394
kasan_kmalloc include/linux/kasan.h:260 [inline]
__do_kmalloc_node mm/slub.c:4328 [inline]
__kmalloc_noprof+0x223/0x510 mm/slub.c:4340
__hid_request+0x2c/0x3c0 drivers/hid/hid-core.c:1980
hidinput_change_resolution_multipliers drivers/hid/hid-input.c:1950 [inline]
hidinput_connect+0x1ada/0x2bd0 drivers/hid/hid-input.c:2327
hid_connect+0x13f3/0x1a60 drivers/hid/hid-core.c:2239
hid_hw_start drivers/hid/hid-core.c:2354 [inline]
hid_hw_start+0xaa/0x140 drivers/hid/hid-core.c:2345
ms_probe+0x195/0x500 drivers/hid/hid-microsoft.c:391
__hid_device_probe drivers/hid/hid-core.c:2724 [inline]
hid_device_probe+0x363/0x720 drivers/hid/hid-core.c:2761
call_driver_probe drivers/base/dd.c:579 [inline]
really_probe+0x241/0xa90 drivers/base/dd.c:657
__driver_probe_device+0x1de/0x440 drivers/base/dd.c:799
driver_probe_device+0x4c/0x1b0 drivers/base/dd.c:829
__device_attach_driver+0x1df/0x310 drivers/base/dd.c:957
bus_for_each_drv+0x159/0x1e0 drivers/base/bus.c:462
__device_attach+0x1e4/0x4b0 drivers/base/dd.c:1029
bus_probe_device+0x17f/0x1c0 drivers/base/bus.c:537
device_add+0x1148/0x1a70 drivers/base/core.c:3692
hid_add_device+0x373/0xa60 drivers/hid/hid-core.c:2907
usbhid_probe+0xd38/0x13f0 drivers/hid/usbhid/hid-core.c:1435
usb_probe_interface+0x300/0x9c0 drivers/usb/core/driver.c:396
call_driver_probe drivers/base/dd.c:579 [inline]
really_probe+0x241/0xa90 drivers/base/dd.c:657
__driver_probe_device+0x1de/0x440 drivers/base/dd.c:799
driver_probe_device+0x4c/0x1b0 drivers/base/dd.c:829
__device_attach_driver+0x1df/0x310 drivers/base/dd.c:957
bus_for_each_drv+0x159/0x1e0 drivers/base/bus.c:462
__device_attach+0x1e4/0x4b0 drivers/base/dd.c:1029
bus_probe_device+0x17f/0x1c0 drivers/base/bus.c:537
device_add+0x1148/0x1a70 drivers/base/core.c:3692
usb_set_configuration+0x1187/0x1e20 drivers/usb/core/message.c:2210
usb_generic_driver_probe+0xb1/0x110 drivers/usb/core/generic.c:250
usb_probe_device+0xec/0x3e0 drivers/usb/core/driver.c:291
call_driver_probe drivers/base/dd.c:579 [inline]
really_probe+0x241/0xa90 drivers/base/dd.c:657
__driver_probe_device+0x1de/0x440 drivers/base/dd.c:799
driver_probe_device+0x4c/0x1b0 drivers/base/dd.c:829
__device_attach_driver+0x1df/0x310 drivers/base/dd.c:957
bus_for_each_drv+0x159/0x1e0 drivers/base/bus.c:462
__device_attach+0x1e4/0x4b0 drivers/base/dd.c:1029
bus_probe_device+0x17f/0x1c0 drivers/base/bus.c:537
device_add+0x1148/0x1a70 drivers/base/core.c:3692
usb_new_device+0xd07/0x1a20 drivers/usb/core/hub.c:2663
hub_port_connect drivers/usb/core/hub.c:5535 [inline]
hub_port_connect_change drivers/usb/core/hub.c:5675 [inline]
port_event drivers/usb/core/hub.c:5835 [inline]
hub_event+0x2eb7/0x4fa0 drivers/usb/core/hub.c:5917
process_one_work+0x9cf/0x1b70 kernel/workqueue.c:3238
process_scheduled_works kernel/workqueue.c:3321 [inline]
worker_thread+0x6c8/0xf10 kernel/workqueue.c:3402
kthread+0x3c2/0x780 kernel/kthread.c:464
ret_from_fork+0x5d4/0x6f0 arch/x86/kernel/process.c:148
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245

The buggy address belongs to the object at ffff8880330e0800
which belongs to the cache kmalloc-8 of size 8
The buggy address is located 1 bytes inside of
allocated 7-byte region [ffff8880330e0800, ffff8880330e0807)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x330e0
flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 00fff00000000000 ffff88801b841500 ffffea000085b700 dead000000000002
raw: 0000000000000000 0000000080800080 00000000f5000000 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 0, migratetype Unmovable, gfp_mask 0x52cc0(GFP_KERNEL|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP), pid 1, tgid 1 (init), ts 15743776341, free_ts 15035826353
set_page_owner include/linux/page_owner.h:32 [inline]
post_alloc_hook+0x1c0/0x230 mm/page_alloc.c:1704
prep_new_page mm/page_alloc.c:1712 [inline]
get_page_from_freelist+0x1321/0x3890 mm/page_alloc.c:3669
__alloc_frozen_pages_noprof+0x261/0x23f0 mm/page_alloc.c:4959
alloc_pages_mpol+0x1fb/0x550 mm/mempolicy.c:2419
alloc_slab_page mm/slub.c:2451 [inline]
allocate_slab mm/slub.c:2619 [inline]
new_slab+0x23b/0x330 mm/slub.c:2673
___slab_alloc+0xd9c/0x1940 mm/slub.c:3859
__slab_alloc.constprop.0+0x56/0xb0 mm/slub.c:3949
__slab_alloc_node mm/slub.c:4024 [inline]
slab_alloc_node mm/slub.c:4185 [inline]
__do_kmalloc_node mm/slub.c:4327 [inline]
__kmalloc_noprof+0x2f2/0x510 mm/slub.c:4340
kmalloc_noprof include/linux/slab.h:909 [inline]
str_read+0x58/0x220 security/selinux/ss/policydb.c:1104
genfs_read+0x688/0xe20 security/selinux/ss/policydb.c:2194
policydb_read+0x28de/0x3220 security/selinux/ss/policydb.c:2707
security_load_policy+0x15c/0x12c0 security/selinux/ss/services.c:2305
sel_write_load+0x332/0x1bd0 security/selinux/selinuxfs.c:603
vfs_write+0x29d/0x1150 fs/read_write.c:684
ksys_write+0x12a/0x250 fs/read_write.c:738
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xcd/0x4c0 arch/x86/entry/syscall_64.c:94
page last free pid 1 tgid 1 stack trace:
reset_page_owner include/linux/page_owner.h:25 [inline]
free_pages_prepare mm/page_alloc.c:1248 [inline]
__free_frozen_pages+0x7fe/0x1180 mm/page_alloc.c:2706
kasan_depopulate_vmalloc_pte+0x5f/0x80 mm/kasan/shadow.c:472
apply_to_pte_range mm/memory.c:3032 [inline]
apply_to_pmd_range mm/memory.c:3076 [inline]
apply_to_pud_range mm/memory.c:3112 [inline]
apply_to_p4d_range mm/memory.c:3148 [inline]
__apply_to_page_range+0xa92/0x1350 mm/memory.c:3184
kasan_release_vmalloc+0xd1/0xe0 mm/kasan/shadow.c:593
kasan_release_vmalloc_node mm/vmalloc.c:2241 [inline]
purge_vmap_node+0x1c4/0xa30 mm/vmalloc.c:2258
__purge_vmap_area_lazy+0xa06/0xc60 mm/vmalloc.c:2348
_vm_unmap_aliases+0x43b/0x670 mm/vmalloc.c:2943
change_page_attr_set_clr+0x252/0x4a0 arch/x86/mm/pat/set_memory.c:2088
change_page_attr_set arch/x86/mm/pat/set_memory.c:2129 [inline]
set_memory_nx+0xb5/0x110 arch/x86/mm/pat/set_memory.c:2318
free_init_pages+0x79/0xd0 arch/x86/mm/init.c:933
free_kernel_image_pages+0x24/0x50 arch/x86/mm/init.c:952
kernel_init+0x30/0x2b0 init/main.c:1483
ret_from_fork+0x5d4/0x6f0 arch/x86/kernel/process.c:148
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245

Memory state around the buggy address:
ffff8880330e0700: 00 fc fc fc 04 fc fc fc 06 fc fc fc 06 fc fc fc
ffff8880330e0780: 05 fc fc fc 05 fc fc fc 05 fc fc fc 00 fc fc fc
>ffff8880330e0800: 07 fc fc fc fa fc fc fc 05 fc fc fc fa fc fc fc
^
ffff8880330e0880: 06 fc fc fc 05 fc fc fc 05 fc fc fc fa fc fc fc
ffff8880330e0900: fa fc fc fc fa fc fc fc fa fc fc fc 05 fc fc fc
==================================================================

---
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