==================================================================
BUG: KASAN: slab-out-of-bounds in __bpf_get_stackid+0x6fa/0x960 kernel/bpf/stackmap.c:274
Write of size 88 at addr ffff8881103aad10 by task syz.3.3812/13805
CPU: 1 PID: 13805 Comm: syz.3.3812 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
Call Trace:
__dump_stack+0x21/0x24 lib/dump_stack.c:88
dump_stack_lvl+0x110/0x170 lib/dump_stack.c:106
print_address_description+0x71/0x200 mm/kasan/report.c:316
print_report+0x4a/0x60 mm/kasan/report.c:420
kasan_report+0x122/0x150 mm/kasan/report.c:524
check_region_inline mm/kasan/generic.c:-1 [inline]
kasan_check_range+0x249/0x2a0 mm/kasan/generic.c:189
memcpy+0x44/0x70 mm/kasan/shadow.c:66
__bpf_get_stackid+0x6fa/0x960 kernel/bpf/stackmap.c:274
____bpf_get_stackid_pe kernel/bpf/stackmap.c:365 [inline]
bpf_get_stackid_pe+0x2ee/0x400 kernel/bpf/stackmap.c:334
bpf_prog_e6b925630670470c+0x21/0x34
bpf_dispatcher_nop_func include/linux/bpf.h:987 [inline]
__bpf_prog_run include/linux/filter.h:596 [inline]
bpf_prog_run include/linux/filter.h:614 [inline]
bpf_overflow_handler+0x51f/0x5e0 kernel/events/core.c:10273
__perf_event_overflow+0x437/0x620 kernel/events/core.c:9448
perf_event_overflow kernel/events/core.c:9469 [inline]
perf_swevent_hrtimer+0x400/0x5b0 kernel/events/core.c:10919
__run_hrtimer kernel/time/hrtimer.c:1685 [inline]
__hrtimer_run_queues+0x3bb/0x8e0 kernel/time/hrtimer.c:1749
hrtimer_interrupt+0x3c7/0x8c0 kernel/time/hrtimer.c:1811
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1107 [inline]
__sysvec_apic_timer_interrupt+0x11e/0x440 arch/x86/kernel/apic/apic.c:1124
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1118 [inline]
sysvec_apic_timer_interrupt+0xa4/0xc0 arch/x86/kernel/apic/apic.c:1118
asm_sysvec_apic_timer_interrupt+0x1b/0x20 arch/x86/include/asm/idtentry.h:691
RIP: 0010:should_fail_ex+0x138/0x520 lib/fault-inject.c:106
Code: 85 4d 03 00 00 49 63 04 24 49 39 c7 7d 74 4c 89 e7 be 04 00 00 00 e8 d7 8c 2a ff f0 45 29 3c 24 eb 4b 65 4c 8b 25 98 e8 75 7d <49> 81 c4 0c 0b 00 00 4c 89 e3 48 c1 eb 03 0f b6 04 13 84 c0 0f 85
RSP: 0018:ffffc90006e679f8 EFLAGS: 00000246
RAX: 0000000080000000 RBX: 0000000000000000 RCX: ffff8881636d5100
RDX: dffffc0000000000 RSI: 0000000000000001 RDI: ffffffff871ce040
RBP: ffffc90006e67a40 R08: ffffc90006e67bf7 R09: ffffc90006e67be0
R10: dffffc0000000000 R11: fffff52000dccf7f R12: ffff8881636d5100
R13: dffffc0000000000 R14: ffffffff871ce040 R15: 0000000000000001
should_fail+0xb/0x10 lib/fault-inject.c:157
should_fail_futex kernel/futex/core.c:83 [inline]
get_futex_key+0x143/0xb10 kernel/futex/core.c:241
futex_wake+0x150/0x8e0 kernel/futex/waitwake.c:156
do_futex+0x2bf/0x430 kernel/futex/syscalls.c:141
__do_sys_futex kernel/futex/syscalls.c:213 [inline]
__se_sys_futex+0x136/0x310 kernel/futex/syscalls.c:194
__x64_sys_futex+0xe5/0x100 kernel/futex/syscalls.c:194
x64_sys_call+0x7ec/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:203
do_syscall_x64 arch/x86/entry/common.c:46 [inline]
do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7fe02679cdd9
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 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 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fe0276a00e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: ffffffffffffffda RBX: 00007fe026a16098 RCX: 00007fe02679cdd9
RDX: 00000000000f4240 RSI: 0000000000000081 RDI: 00007fe026a1609c
RBP: 00007fe026a16090 R08: 000792e12ff17222 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fe026a16128 R14: 00007ffff96d79e0 R15: 00007ffff96d7ac8
Allocated by task 13804:
kasan_save_stack mm/kasan/common.c:46 [inline]
kasan_set_track+0x4b/0x70 mm/kasan/common.c:53
kasan_save_alloc_info+0x25/0x30 mm/kasan/generic.c:505
____kasan_kmalloc mm/kasan/common.c:380 [inline]
__kasan_kmalloc+0x95/0xb0 mm/kasan/common.c:389
kasan_kmalloc include/linux/kasan.h:212 [inline]
__do_kmalloc_node mm/slab_common.c:938 [inline]
__kmalloc_node+0xb2/0x1e0 mm/slab_common.c:945
kmalloc_node include/linux/slab.h:589 [inline]
__bpf_map_area_alloc kernel/bpf/syscall.c:328 [inline]
bpf_map_area_alloc+0x4b/0xe0 kernel/bpf/syscall.c:341
prealloc_elems_and_freelist+0x8a/0x1e0 kernel/bpf/stackmap.c:51
stack_map_alloc+0x3a7/0x530 kernel/bpf/stackmap.c:117
find_and_alloc_map kernel/bpf/syscall.c:133 [inline]
map_create+0x49c/0xd80 kernel/bpf/syscall.c:1126
__sys_bpf+0x34e/0x850 kernel/bpf/syscall.c:4988
__do_sys_bpf kernel/bpf/syscall.c:5110 [inline]
__se_sys_bpf kernel/bpf/syscall.c:5108 [inline]
__x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:5108
x64_sys_call+0x488/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:322
do_syscall_x64 arch/x86/entry/common.c:46 [inline]
do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76
entry_SYSCALL_64_after_hwframe+0x68/0xd2
The buggy address belongs to the object at ffff8881103aad00
which belongs to the cache kmalloc-64 of size 64
The buggy address is located 16 bytes inside of
64-byte region [ffff8881103aad00, ffff8881103aad40)
The buggy address belongs to the physical page:
page:ffffea000440ea80 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1103aa
flags: 0x4000000000000200(slab|zone=1)
raw: 4000000000000200 ffffea00047b0c00 dead000000000003 ffff888100042780
raw: 0000000000000000 0000000000200020 00000001ffffffff 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 0x112cc0(GFP_USER|__GFP_NOWARN|__GFP_NORETRY), pid 12962, tgid 12959 (syz.4.3569), ts 335787408450, free_ts 326157293451
set_page_owner include/linux/page_owner.h:33 [inline]
post_alloc_hook+0x1f5/0x210 mm/page_alloc.c:2672
prep_new_page+0x1c/0x110 mm/page_alloc.c:2679
get_page_from_freelist+0x2d12/0x2d80 mm/page_alloc.c:4585
__alloc_pages+0x1fa/0x610 mm/page_alloc.c:5926
alloc_slab_page+0x6e/0xf0 include/linux/gfp.h:-1
allocate_slab mm/slub.c:1967 [inline]
new_slab+0x98/0x3d0 mm/slub.c:2020
___slab_alloc+0x6bd/0xb20 mm/slub.c:3177
__slab_alloc+0x5e/0xa0 mm/slub.c:3263
slab_alloc_node mm/slub.c:3348 [inline]
__kmem_cache_alloc_node+0x203/0x2c0 mm/slub.c:3423
__do_kmalloc_node mm/slab_common.c:937 [inline]
__kmalloc+0xa1/0x1e0 mm/slab_common.c:951
kmalloc include/linux/slab.h:568 [inline]
kzalloc include/linux/slab.h:699 [inline]
kobject_get_path+0xbf/0x200 lib/kobject.c:152
kobject_uevent_env+0x2a0/0x730 lib/kobject_uevent.c:544
kobject_uevent+0x1d/0x30 lib/kobject_uevent.c:657
rx_queue_add_kobject net/core/net-sysfs.c:1068 [inline]
net_rx_queue_update_kobjects+0x249/0x4d0 net/core/net-sysfs.c:1108
register_queue_kobjects net/core/net-sysfs.c:1768 [inline]
netdev_register_kobject+0x26b/0x360 net/core/net-sysfs.c:2013
register_netdevice+0xeb1/0x1530 net/core/dev.c:10194
page last free stack trace:
reset_page_owner include/linux/page_owner.h:26 [inline]
free_pages_prepare mm/page_alloc.c:1580 [inline]
free_pcp_prepare mm/page_alloc.c:1654 [inline]
free_unref_page_prepare+0x7f8/0x800 mm/page_alloc.c:3620
free_unref_page+0x95/0x540 mm/page_alloc.c:3718
free_the_page mm/page_alloc.c:863 [inline]
__free_pages+0x67/0x100 mm/page_alloc.c:6016
__free_slab+0xca/0x1a0 mm/slub.c:2044
free_slab mm/slub.c:2059 [inline]
discard_slab mm/slub.c:2065 [inline]
__unfreeze_partials+0x160/0x190 mm/slub.c:2614
put_cpu_partial+0xa9/0x100 mm/slub.c:2690
__slab_free+0x1c4/0x280 mm/slub.c:3589
do_slab_free mm/slub.c:3666 [inline]
___cache_free+0xbf/0xd0 mm/slub.c:3722
qlink_free mm/kasan/quarantine.c:168 [inline]
qlist_free_all+0xc6/0x140 mm/kasan/quarantine.c:187
kasan_quarantine_reduce+0x14a/0x170 mm/kasan/quarantine.c:294
__kasan_slab_alloc+0x24/0x80 mm/kasan/common.c:311
kasan_slab_alloc include/linux/kasan.h:202 [inline]
slab_post_alloc_hook+0x4f/0x2d0 mm/slab.h:768
slab_alloc_node mm/slub.c:3382 [inline]
kmem_cache_alloc_node+0x181/0x340 mm/slub.c:3429
__alloc_skb+0xea/0x4b0 net/core/skbuff.c:508
alloc_skb_fclone include/linux/skbuff.h:1372 [inline]
tcp_stream_alloc_skb+0x47/0x360 net/ipv4/tcp.c:871
tcp_sendmsg_locked+0xe02/0x3a90 net/ipv4/tcp.c:1334
Memory state around the buggy address:
ffff8881103aac00: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
ffff8881103aac80: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
>ffff8881103aad00: 00 00 00 00 00 fc fc fc fc fc fc fc fc fc fc fc
^
ffff8881103aad80: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
ffff8881103aae00: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
==================================================================
----------------
Code disassembly (best guess):
0: 85 4d 03 test %ecx,0x3(%rbp)
3: 00 00 add %al,(%rax)
5: 49 63 04 24 movslq (%r12),%rax
9: 49 39 c7 cmp %rax,%r15
c: 7d 74 jge 0x82
e: 4c 89 e7 mov %r12,%rdi
11: be 04 00 00 00 mov $0x4,%esi
16: e8 d7 8c 2a ff call 0xff2a8cf2
1b: f0 45 29 3c 24 lock sub %r15d,(%r12)
20: eb 4b jmp 0x6d
22: 65 4c 8b 25 98 e8 75 mov %gs:0x7d75e898(%rip),%r12 # 0x7d75e8c2
29: 7d
* 2a: 49 81 c4 0c 0b 00 00 add $0xb0c,%r12 <-- trapping instruction
31: 4c 89 e3 mov %r12,%rbx
34: 48 c1 eb 03 shr $0x3,%rbx
38: 0f b6 04 13 movzbl (%rbx,%rdx,1),%eax
3c: 84 c0 test %al,%al
3e: 0f .byte 0xf
3f: 85 .byte 0x85