==================================================================
BUG: KASAN: slab-out-of-bounds in __bpf_get_stackid+0x6bf/0x900 kernel/bpf/stackmap.c:271
Write of size 40 at addr ffff88805d7f4a90 by task syz.1.1063/9713
CPU: 1 PID: 9713 Comm: syz.1.1063 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
Call Trace:
dump_stack_lvl+0x18c/0x250 lib/dump_stack.c:106
print_address_description mm/kasan/report.c:364 [inline]
print_report+0xa8/0x210 mm/kasan/report.c:468
kasan_report+0x117/0x150 mm/kasan/report.c:581
check_region_inline mm/kasan/generic.c:-1 [inline]
kasan_check_range+0x241/0x290 mm/kasan/generic.c:187
__asan_memcpy+0x40/0x70 mm/kasan/shadow.c:106
__bpf_get_stackid+0x6bf/0x900 kernel/bpf/stackmap.c:271
____bpf_get_stackid_pe kernel/bpf/stackmap.c:362 [inline]
bpf_get_stackid_pe+0x343/0x410 kernel/bpf/stackmap.c:331
bpf_prog_709c33675fcd9051+0x29/0x3e
bpf_dispatcher_nop_func include/linux/bpf.h:1224 [inline]
__bpf_prog_run include/linux/filter.h:616 [inline]
bpf_prog_run include/linux/filter.h:623 [inline]
bpf_overflow_handler+0x1fc/0x510 kernel/events/core.c:10547
__perf_event_overflow+0x447/0x630 kernel/events/core.c:9718
perf_swevent_hrtimer+0x4aa/0x570 kernel/events/core.c:11188
__run_hrtimer kernel/time/hrtimer.c:1750 [inline]
__hrtimer_run_queues+0x4e1/0xc40 kernel/time/hrtimer.c:1814
hrtimer_interrupt+0x3c9/0x9c0 kernel/time/hrtimer.c:1876
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1077 [inline]
__sysvec_apic_timer_interrupt+0xfb/0x3b0 arch/x86/kernel/apic/apic.c:1094
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1088 [inline]
sysvec_apic_timer_interrupt+0x9f/0xc0 arch/x86/kernel/apic/apic.c:1088
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:687
RIP: 0010:_perf_ioctl kernel/events/core.c:6015 [inline]
RIP: 0010:perf_ioctl+0xf37/0x24a0 kernel/events/core.c:6074
Code: 2d 00 48 89 df 4c 89 fe 41 ff 16 41 89 c6 31 ff 89 c6 e8 2c a2 d5 ff 45 85 f6 0f 84 6e 10 00 00 e8 6e 9e d5 ff e9 36 12 00 00 64 9e d5 ff 45 31 ff e9 3f 12 00 00 4d 89 fe 49 81 c6 b0 01 00
RSP: 0018:ffffc900034a7c00 EFLAGS: 00000246
RAX: ffffffff81b1788f RBX: 0000000000000000 RCX: 0000000000000000
RDX: ffff88807b35bc00 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc900034a7ed8 R08: ffff88802d27bbdf R09: 1ffff11005a4f77b
R10: dffffc0000000000 R11: ffffed1005a4f77c R12: 0000000040042408
R13: dffffc0000000000 R14: fffff52000694f94 R15: ffffc9000323d000
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:871 [inline]
__se_sys_ioctl+0xfd/0x170 fs/ioctl.c:857
do_syscall_x64 arch/x86/entry/common.c:46 [inline]
do_syscall_64+0x55/0xa0 arch/x86/entry/common.c:76
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f0e8b19c799
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:00007f0e8c0b8028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f0e8b415fa0 RCX: 00007f0e8b19c799
RDX: 0000000000000004 RSI: 0000000040042408 RDI: 0000000000000005
RBP: 00007f0e8b232c99 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f0e8b416038 R14: 00007f0e8b415fa0 R15: 00007ffcd182f6b8
Allocated by task 9713:
kasan_save_stack mm/kasan/common.c:46 [inline]
kasan_set_track+0x4e/0x70 mm/kasan/common.c:53
____kasan_kmalloc mm/kasan/common.c:375 [inline]
__kasan_kmalloc+0x8f/0xa0 mm/kasan/common.c:384
kasan_kmalloc include/linux/kasan.h:198 [inline]
__do_kmalloc_node mm/slab_common.c:1007 [inline]
__kmalloc_node+0xb4/0x230 mm/slab_common.c:1014
kmalloc_node include/linux/slab.h:620 [inline]
__bpf_map_area_alloc kernel/bpf/syscall.c:303 [inline]
bpf_map_area_alloc+0x5e/0x110 kernel/bpf/syscall.c:316
prealloc_elems_and_freelist+0x86/0x1c0 kernel/bpf/stackmap.c:51
stack_map_alloc+0x33a/0x4c0 kernel/bpf/stackmap.c:114
map_create+0x877/0x12f0 kernel/bpf/syscall.c:1247
__sys_bpf+0x651/0x890 kernel/bpf/syscall.c:5458
__do_sys_bpf kernel/bpf/syscall.c:5580 [inline]
__se_sys_bpf kernel/bpf/syscall.c:5578 [inline]
__x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:5578
do_syscall_x64 arch/x86/entry/common.c:46 [inline]
do_syscall_64+0x55/0xa0 arch/x86/entry/common.c:76
entry_SYSCALL_64_after_hwframe+0x68/0xd2
Last potentially related work creation:
kasan_save_stack+0x3e/0x60 mm/kasan/common.c:46
__kasan_record_aux_stack+0xaf/0xc0 mm/kasan/generic.c:492
__call_rcu_common kernel/rcu/tree.c:2721 [inline]
call_rcu+0x153/0x950 kernel/rcu/tree.c:2837
nf_unregister_net_hook net/netfilter/core.c:-1 [inline]
nf_unregister_net_hooks+0xcb/0x130 net/netfilter/core.c:613
ops_exit_list net/core/net_namespace.c:173 [inline]
cleanup_net+0x70a/0xbb0 net/core/net_namespace.c:652
process_one_work kernel/workqueue.c:2653 [inline]
process_scheduled_works+0xa5d/0x15d0 kernel/workqueue.c:2730
worker_thread+0xa55/0xfc0 kernel/workqueue.c:2811
kthread+0x2fa/0x390 kernel/kthread.c:388
ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152
ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293
The buggy address belongs to the object at ffff88805d7f4a80
which belongs to the cache kmalloc-cg-64 of size 64
The buggy address is located 16 bytes inside of
allocated 40-byte region [ffff88805d7f4a80, ffff88805d7f4aa8)
The buggy address belongs to the physical page:
page:ffffea000175fd00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x5d7f4
memcg:ffff88802e775a01
anon flags: 0xfff00000000800(slab|node=0|zone=1|lastcpupid=0x7ff)
page_type: 0xffffffff()
raw: 00fff00000000800 ffff888017c4da00 ffffea0000b6a180 dead000000000005
raw: 0000000000000000 0000000080200020 00000001ffffffff ffff88802e775a01
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 5810, tgid 5810 (syz-executor), ts 345243142043, free_ts 344988208438
set_page_owner include/linux/page_owner.h:31 [inline]
post_alloc_hook+0x1c1/0x200 mm/page_alloc.c:1581
prep_new_page mm/page_alloc.c:1588 [inline]
get_page_from_freelist+0x1951/0x19e0 mm/page_alloc.c:3220
__alloc_pages+0x1f0/0x460 mm/page_alloc.c:4500
alloc_slab_page+0x5d/0x160 mm/slub.c:1881
allocate_slab mm/slub.c:2028 [inline]
new_slab+0x87/0x2d0 mm/slub.c:2081
___slab_alloc+0xc5d/0x12f0 mm/slub.c:3253
__slab_alloc mm/slub.c:3339 [inline]
__slab_alloc_node mm/slub.c:3392 [inline]
slab_alloc_node mm/slub.c:3485 [inline]
__kmem_cache_alloc_node+0x19e/0x250 mm/slub.c:3534
__do_kmalloc_node mm/slab_common.c:1006 [inline]
__kmalloc_node+0xa4/0x230 mm/slab_common.c:1014
kmalloc_node include/linux/slab.h:620 [inline]
kvmalloc_node+0x70/0x180 mm/util.c:617
kvmalloc include/linux/slab.h:738 [inline]
kvzalloc include/linux/slab.h:746 [inline]
allocate_hook_entries_size net/netfilter/core.c:61 [inline]
nf_hook_entries_grow+0x27d/0x6d0 net/netfilter/core.c:140
nf_hook_entries_insert_raw+0x4b/0x300 net/netfilter/core.c:204
nf_nat_register_fn+0x1d0/0x580 net/netfilter/nf_nat_core.c:1264
ipt_nat_register_lookups net/ipv4/netfilter/iptable_nat.c:77 [inline]
iptable_nat_table_init+0xd4/0x2d0 net/ipv4/netfilter/iptable_nat.c:121
xt_find_table_lock+0x306/0x3e0 net/netfilter/x_tables.c:1259
xt_request_find_table_lock+0x26/0x100 net/netfilter/x_tables.c:1284
get_info net/ipv4/netfilter/ip_tables.c:963 [inline]
do_ipt_get_ctl+0x717/0x1200 net/ipv4/netfilter/ip_tables.c:1659
page last free stack trace:
reset_page_owner include/linux/page_owner.h:24 [inline]
free_pages_prepare mm/page_alloc.c:1181 [inline]
free_unref_page_prepare+0x7b2/0x8c0 mm/page_alloc.c:2365
free_unref_page_list+0xbe/0x860 mm/page_alloc.c:2504
release_pages+0x1f7a/0x2200 mm/swap.c:1022
tlb_batch_pages_flush mm/mmu_gather.c:99 [inline]
tlb_flush_mmu_free mm/mmu_gather.c:294 [inline]
tlb_flush_mmu+0x379/0x510 mm/mmu_gather.c:301
tlb_finish_mmu+0xf9/0x220 mm/mmu_gather.c:425
exit_mmap+0x428/0xb90 mm/mmap.c:3315
__mmput+0x118/0x3c0 kernel/fork.c:1355
exit_mm+0x1f2/0x2c0 kernel/exit.c:569
do_exit+0x8dd/0x2460 kernel/exit.c:870
do_group_exit+0x21b/0x2d0 kernel/exit.c:1024
get_signal+0x12fc/0x13f0 kernel/signal.c:2902
arch_do_signal_or_restart+0xc2/0x800 arch/x86/kernel/signal.c:310
exit_to_user_mode_loop+0x70/0x110 kernel/entry/common.c:174
exit_to_user_mode_prepare+0xee/0x180 kernel/entry/common.c:210
__syscall_exit_to_user_mode_work kernel/entry/common.c:291 [inline]
syscall_exit_to_user_mode+0x1a/0x50 kernel/entry/common.c:302
do_syscall_64+0x61/0xa0 arch/x86/entry/common.c:82
Memory state around the buggy address:
ffff88805d7f4980: 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc fc
ffff88805d7f4a00: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
>ffff88805d7f4a80: 00 00 00 00 00 fc fc fc fc fc fc fc fc fc fc fc
^
ffff88805d7f4b00: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
ffff88805d7f4b80: 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc fc
==================================================================
----------------
Code disassembly (best guess):
0: 2d 00 48 89 df sub $0xdf894800,%eax
5: 4c 89 fe mov %r15,%rsi
8: 41 ff 16 call *(%r14)
b: 41 89 c6 mov %eax,%r14d
e: 31 ff xor %edi,%edi
10: 89 c6 mov %eax,%esi
12: e8 2c a2 d5 ff call 0xffd5a243
17: 45 85 f6 test %r14d,%r14d
1a: 0f 84 6e 10 00 00 je 0x108e
20: e8 6e 9e d5 ff call 0xffd59e93
25: e9 36 12 00 00 jmp 0x1260
* 2a: e8 64 9e d5 ff call 0xffd59e93 <-- trapping instruction
2f: 45 31 ff xor %r15d,%r15d
32: e9 3f 12 00 00 jmp 0x1276
37: 4d 89 fe mov %r15,%r14
3a: 49 rex.WB
3b: 81 .byte 0x81
3c: c6 (bad)
3d: b0 01 mov $0x1,%al