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Message-ID: <68a15b7e.050a0220.e29e5.005a.GAE@google.com>
Date: Sat, 16 Aug 2025 21:33:02 -0700
From: syzbot <syzbot+abbfd103085885cf16a2@...kaller.appspotmail.com>
To: hdanton@...a.com, linux-kernel@...r.kernel.org,
syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [usb?] KASAN: slab-out-of-bounds Read in usbtmc_interrupt
Hello,
syzbot has tested the proposed patch but the reproducer is still triggering an issue:
KASAN: slab-out-of-bounds Read in usbtmc_interrupt
usbtmc 1-1:16.0: invalid notification: 33
usbtmc 1-1:16.0: invalid notification: 36
usbtmc 1-1:16.0: invalid notification: 8
==================================================================
BUG: KASAN: slab-out-of-bounds in usbtmc_interrupt+0x560/0x720 drivers/usb/class/usbtmc.c:2314
Read of size 1 at addr ffff888028fb8ae1 by task kworker/1:0/24
CPU: 1 UID: 0 PID: 24 Comm: kworker/1:0 Not tainted 6.17.0-rc1-next-20250815-syzkaller-g1357b2649c02-dirty #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
Workqueue: events nsim_fib_event_work
Call Trace:
<IRQ>
dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120
print_address_description mm/kasan/report.c:378 [inline]
print_report+0xca/0x240 mm/kasan/report.c:482
kasan_report+0x118/0x150 mm/kasan/report.c:595
usbtmc_interrupt+0x560/0x720 drivers/usb/class/usbtmc.c:2314
__usb_hcd_giveback_urb+0x376/0x540 drivers/usb/core/hcd.c:1661
dummy_timer+0x862/0x4550 drivers/usb/gadget/udc/dummy_hcd.c:1995
__run_hrtimer kernel/time/hrtimer.c:1761 [inline]
__hrtimer_run_queues+0x529/0xc60 kernel/time/hrtimer.c:1825
hrtimer_run_softirq+0x187/0x2b0 kernel/time/hrtimer.c:1842
handle_softirqs+0x283/0x870 kernel/softirq.c:579
__do_softirq kernel/softirq.c:613 [inline]
invoke_softirq kernel/softirq.c:453 [inline]
__irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:680
irq_exit_rcu+0x9/0x30 kernel/softirq.c:696
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1050 [inline]
sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1050
</IRQ>
<TASK>
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:rhashtable_insert_fast+0x1c/0xf70 include/linux/rhashtable.h:831
Code: 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 55 48 89 e5 41 57 41 56 41 55 41 54 53 48 83 e4 e0 48 81 ec 20 01 00 00 <48> 89 74 24 30 49 89 fc 65 48 8b 05 54 a5 c3 0b 48 89 84 24 00 01
RSP: 0018:ffffc900001e7560 EFLAGS: 00000286
RAX: 0000000000000000 RBX: ffff888022357068 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffff888145eb4e20 RDI: ffff888022357068
RBP: ffffc900001e76a8 R08: 0001000000000000 R09: 00200000001c0000
R10: 0000000000000003 R11: 0000000000000000 R12: ffff888022357000
R13: ffff888142fcb690 R14: ffffc900001e7840 R15: dffffc0000000000
nsim_fib6_rt_add drivers/net/netdevsim/fib.c:686 [inline]
nsim_fib6_rt_insert drivers/net/netdevsim/fib.c:759 [inline]
nsim_fib6_event drivers/net/netdevsim/fib.c:856 [inline]
nsim_fib_event drivers/net/netdevsim/fib.c:889 [inline]
nsim_fib_event_work+0x2319/0x3180 drivers/net/netdevsim/fib.c:1493
process_one_work kernel/workqueue.c:3236 [inline]
process_scheduled_works+0xade/0x17b0 kernel/workqueue.c:3319
worker_thread+0x8a0/0xda0 kernel/workqueue.c:3400
kthread+0x70e/0x8a0 kernel/kthread.c:463
ret_from_fork+0x3f9/0x770 arch/x86/kernel/process.c:148
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
</TASK>
Allocated by task 981:
kasan_save_stack mm/kasan/common.c:47 [inline]
kasan_save_track+0x3e/0x80 mm/kasan/common.c:68
poison_kmalloc_redzone mm/kasan/common.c:388 [inline]
__kasan_kmalloc+0x93/0xb0 mm/kasan/common.c:405
kasan_kmalloc include/linux/kasan.h:260 [inline]
__do_kmalloc_node mm/slub.c:4365 [inline]
__kmalloc_noprof+0x27a/0x4f0 mm/slub.c:4377
kmalloc_noprof include/linux/slab.h:913 [inline]
usbtmc_probe+0xa3a/0x1ad0 drivers/usb/class/usbtmc.c:2467
usb_probe_interface+0x665/0xc30 drivers/usb/core/driver.c:396
call_driver_probe drivers/base/dd.c:-1 [inline]
really_probe+0x26d/0x9e0 drivers/base/dd.c:659
__driver_probe_device+0x18c/0x2f0 drivers/base/dd.c:801
driver_probe_device+0x4f/0x430 drivers/base/dd.c:831
__device_attach_driver+0x2ce/0x530 drivers/base/dd.c:959
bus_for_each_drv+0x24e/0x2e0 drivers/base/bus.c:462
__device_attach+0x2b8/0x400 drivers/base/dd.c:1031
bus_probe_device+0x185/0x260 drivers/base/bus.c:537
device_add+0x7b6/0xb50 drivers/base/core.c:3689
usb_set_configuration+0x1a87/0x20e0 drivers/usb/core/message.c:2210
usb_generic_driver_probe+0x8d/0x150 drivers/usb/core/generic.c:250
usb_probe_device+0x1c4/0x390 drivers/usb/core/driver.c:291
call_driver_probe drivers/base/dd.c:-1 [inline]
really_probe+0x26d/0x9e0 drivers/base/dd.c:659
__driver_probe_device+0x18c/0x2f0 drivers/base/dd.c:801
driver_probe_device+0x4f/0x430 drivers/base/dd.c:831
__device_attach_driver+0x2ce/0x530 drivers/base/dd.c:959
bus_for_each_drv+0x24e/0x2e0 drivers/base/bus.c:462
__device_attach+0x2b8/0x400 drivers/base/dd.c:1031
bus_probe_device+0x185/0x260 drivers/base/bus.c:537
device_add+0x7b6/0xb50 drivers/base/core.c:3689
usb_new_device+0xa39/0x16f0 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:5870 [inline]
hub_event+0x2958/0x4a20 drivers/usb/core/hub.c:5952
process_one_work kernel/workqueue.c:3236 [inline]
process_scheduled_works+0xade/0x17b0 kernel/workqueue.c:3319
worker_thread+0x8a0/0xda0 kernel/workqueue.c:3400
kthread+0x70e/0x8a0 kernel/kthread.c:463
ret_from_fork+0x3f9/0x770 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 ffff888028fb8ae0
which belongs to the cache kmalloc-8 of size 8
The buggy address is located 0 bytes to the right of
allocated 1-byte region [ffff888028fb8ae0, ffff888028fb8ae1)
The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x28fb8
flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 00fff00000000000 ffff88801a841500 dead000000000100 dead000000000122
raw: 0000000000000000 0000000000800080 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 0x52c00(GFP_NOIO|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP), pid 1213, tgid 1213 (kworker/0:2), ts 9601359196, free_ts 9100050588
set_page_owner include/linux/page_owner.h:32 [inline]
post_alloc_hook+0x240/0x2a0 mm/page_alloc.c:1851
prep_new_page mm/page_alloc.c:1859 [inline]
get_page_from_freelist+0x21e4/0x22c0 mm/page_alloc.c:3858
__alloc_frozen_pages_noprof+0x181/0x370 mm/page_alloc.c:5148
alloc_pages_mpol+0x232/0x4a0 mm/mempolicy.c:2416
alloc_slab_page mm/slub.c:2487 [inline]
allocate_slab+0x8a/0x370 mm/slub.c:2655
new_slab mm/slub.c:2709 [inline]
___slab_alloc+0xbeb/0x1410 mm/slub.c:3891
__slab_alloc mm/slub.c:3981 [inline]
__slab_alloc_node mm/slub.c:4056 [inline]
slab_alloc_node mm/slub.c:4217 [inline]
__kmalloc_cache_noprof+0x296/0x3d0 mm/slub.c:4391
kmalloc_noprof include/linux/slab.h:909 [inline]
usb_control_msg+0x73/0x3e0 drivers/usb/core/message.c:144
get_port_status drivers/usb/core/hub.c:611 [inline]
hub_ext_port_status+0x116/0x820 drivers/usb/core/hub.c:628
usb_hub_port_status drivers/usb/core/hub.c:678 [inline]
hub_activate+0x77d/0x1a70 drivers/usb/core/hub.c:1189
process_one_work kernel/workqueue.c:3236 [inline]
process_scheduled_works+0xade/0x17b0 kernel/workqueue.c:3319
worker_thread+0x8a0/0xda0 kernel/workqueue.c:3400
kthread+0x70e/0x8a0 kernel/kthread.c:463
ret_from_fork+0x3f9/0x770 arch/x86/kernel/process.c:148
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
page last free pid 1213 tgid 1213 stack trace:
reset_page_owner include/linux/page_owner.h:25 [inline]
free_pages_prepare mm/page_alloc.c:1395 [inline]
__free_frozen_pages+0xbc4/0xd30 mm/page_alloc.c:2895
vfree+0x25a/0x400 mm/vmalloc.c:3434
delayed_vfree_work+0x55/0x80 mm/vmalloc.c:3353
process_one_work kernel/workqueue.c:3236 [inline]
process_scheduled_works+0xade/0x17b0 kernel/workqueue.c:3319
worker_thread+0x8a0/0xda0 kernel/workqueue.c:3400
kthread+0x70e/0x8a0 kernel/kthread.c:463
ret_from_fork+0x3f9/0x770 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:
ffff888028fb8980: 04 fc fc fc 06 fc fc fc fa fc fc fc 06 fc fc fc
ffff888028fb8a00: 06 fc fc fc 06 fc fc fc 06 fc fc fc fa fc fc fc
>ffff888028fb8a80: 00 fc fc fc 00 fc fc fc 00 fc fc fc 01 fc fc fc
^
ffff888028fb8b00: 00 fc fc fc 00 fc fc fc 00 fc fc fc 00 fc fc fc
ffff888028fb8b80: 00 fc fc fc 00 fc fc fc 00 fc fc fc 00 fc fc fc
==================================================================
----------------
Code disassembly (best guess):
0: 90 nop
1: 90 nop
2: 90 nop
3: 90 nop
4: 90 nop
5: 90 nop
6: 90 nop
7: 90 nop
8: 90 nop
9: 90 nop
a: 90 nop
b: 90 nop
c: 90 nop
d: 90 nop
e: f3 0f 1e fa endbr64
12: 55 push %rbp
13: 48 89 e5 mov %rsp,%rbp
16: 41 57 push %r15
18: 41 56 push %r14
1a: 41 55 push %r13
1c: 41 54 push %r12
1e: 53 push %rbx
1f: 48 83 e4 e0 and $0xffffffffffffffe0,%rsp
23: 48 81 ec 20 01 00 00 sub $0x120,%rsp
* 2a: 48 89 74 24 30 mov %rsi,0x30(%rsp) <-- trapping instruction
2f: 49 89 fc mov %rdi,%r12
32: 65 48 8b 05 54 a5 c3 mov %gs:0xbc3a554(%rip),%rax # 0xbc3a58e
39: 0b
3a: 48 rex.W
3b: 89 .byte 0x89
3c: 84 24 00 test %ah,(%rax,%rax,1)
3f: 01 .byte 0x1
Tested on:
commit: 1357b264 Add linux-next specific files for 20250815
git tree: linux-next
console output: https://syzkaller.appspot.com/x/log.txt?x=12ff0ba2580000
kernel config: https://syzkaller.appspot.com/x/.config?x=6401f805169ac8b0
dashboard link: https://syzkaller.appspot.com/bug?extid=abbfd103085885cf16a2
compiler: Debian clang version 20.1.7 (++20250616065708+6146a88f6049-1~exp1~20250616065826.132), Debian LLD 20.1.7
patch: https://syzkaller.appspot.com/x/patch.diff?x=1419baf0580000
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