==================================================================
BUG: KASAN: slab-out-of-bounds in __bpf_get_stackid+0x6c9/0x920 kernel/bpf/stackmap.c:274
Write of size 72 at addr ffff8880592e5a10 by task syz.4.9009/11794
CPU: 0 PID: 11794 Comm: syz.4.9009 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
Call Trace:
dump_stack_lvl+0x188/0x24e lib/dump_stack.c:106
print_address_description mm/kasan/report.c:316 [inline]
print_report+0xa8/0x210 mm/kasan/report.c:420
kasan_report+0x10b/0x140 mm/kasan/report.c:524
check_region_inline mm/kasan/generic.c:-1 [inline]
kasan_check_range+0x235/0x290 mm/kasan/generic.c:189
memcpy+0x3c/0x60 mm/kasan/shadow.c:66
__bpf_get_stackid+0x6c9/0x920 kernel/bpf/stackmap.c:274
____bpf_get_stackid_pe kernel/bpf/stackmap.c:365 [inline]
bpf_get_stackid_pe+0x33f/0x400 kernel/bpf/stackmap.c:334
bpf_prog_ceda4e53fcf21ae1+0x28/0x40
bpf_dispatcher_nop_func include/linux/bpf.h:1012 [inline]
__bpf_prog_run include/linux/filter.h:607 [inline]
bpf_prog_run include/linux/filter.h:614 [inline]
bpf_overflow_handler+0x522/0x7c0 kernel/events/core.c:10321
__perf_event_overflow+0x448/0x610 kernel/events/core.c:9496
perf_event_overflow kernel/events/core.c:9517 [inline]
perf_swevent_hrtimer+0x472/0x630 kernel/events/core.c:10967
__run_hrtimer kernel/time/hrtimer.c:1747 [inline]
__hrtimer_run_queues+0x50b/0xd50 kernel/time/hrtimer.c:1811
hrtimer_interrupt+0x3c5/0x9c0 kernel/time/hrtimer.c:1873
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1107 [inline]
__sysvec_apic_timer_interrupt+0x153/0x5a0 arch/x86/kernel/apic/apic.c:1124
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1118 [inline]
sysvec_apic_timer_interrupt+0x9b/0xc0 arch/x86/kernel/apic/apic.c:1118
asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:691
RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline]
RIP: 0010:_raw_spin_unlock_irqrestore+0xbc/0x120 kernel/locking/spinlock.c:194
Code: c7 44 24 20 00 00 00 00 9c 8f 44 24 20 f7 44 24 20 00 02 00 00 41 c6 04 07 f8 75 4b f7 c3 00 02 00 00 74 01 fb bf 01 00 00 00 df 0d 21 f7 65 8b 05 30 91 ca 75 85 c0 74 3c 48 c7 04 24 0e 36
RSP: 0018:ffffc900044bfae0 EFLAGS: 00000206
RAX: dffffc0000000004 RBX: 0000000000000a06 RCX: 81616c39132e9900
RDX: dffffc0000000000 RSI: ffffffff8a8c10a0 RDI: 0000000000000001
RBP: ffffc900044bfb68 R08: ffff8880b8e3580b R09: 1ffff110171c6b01
R10: dffffc0000000000 R11: ffffed10171c6b02 R12: dffffc0000000000
R13: dffffc0000000000 R14: ffff88802d610a00 R15: 1ffff92000897f5c
try_to_wake_up+0x64c/0x1080 kernel/sched/core.c:4230
wake_up_process kernel/sched/core.c:4362 [inline]
wake_up_q+0x78/0xc0 kernel/sched/core.c:1010
futex_wake+0x426/0x4f0 kernel/futex/waitwake.c:184
do_futex+0x2e2/0x320 kernel/futex/syscalls.c:139
__do_sys_futex kernel/futex/syscalls.c:211 [inline]
__se_sys_futex+0x381/0x410 kernel/futex/syscalls.c:192
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: 0033:0x7fe61659c819
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:00007fe6174cd0e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: ffffffffffffffda RBX: 00007fe616816098 RCX: 00007fe61659c819
RDX: 00000000000f4240 RSI: 0000000000000081 RDI: 00007fe61681609c
RBP: 00007fe616816090 R08: 000c82d824cbe54a R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fe616816128 R14: 00007ffd2818bc60 R15: 00007ffd2818bd48
Allocated by task 11794:
kasan_save_stack mm/kasan/common.c:46 [inline]
kasan_set_track+0x4b/0x70 mm/kasan/common.c:53
____kasan_kmalloc mm/kasan/common.c:375 [inline]
__kasan_kmalloc+0x8e/0xa0 mm/kasan/common.c:384
kasan_kmalloc include/linux/kasan.h:211 [inline]
__do_kmalloc_node mm/slab_common.c:936 [inline]
__kmalloc_node+0xb0/0x240 mm/slab_common.c:943
kmalloc_node include/linux/slab.h:589 [inline]
__bpf_map_area_alloc kernel/bpf/syscall.c:328 [inline]
bpf_map_area_alloc+0x47/0xe0 kernel/bpf/syscall.c:341
prealloc_elems_and_freelist+0x86/0x1c0 kernel/bpf/stackmap.c:51
stack_map_alloc+0x390/0x520 kernel/bpf/stackmap.c:117
find_and_alloc_map kernel/bpf/syscall.c:133 [inline]
map_create+0x534/0x1000 kernel/bpf/syscall.c:1149
__sys_bpf+0x38b/0x780 kernel/bpf/syscall.c:5013
__do_sys_bpf kernel/bpf/syscall.c:5135 [inline]
__se_sys_bpf kernel/bpf/syscall.c:5133 [inline]
__x64_sys_bpf+0x78/0x90 kernel/bpf/syscall.c:5133
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
Last potentially related work creation:
kasan_save_stack+0x3a/0x60 mm/kasan/common.c:46
__kasan_record_aux_stack+0xb2/0xc0 mm/kasan/generic.c:486
call_rcu+0x14f/0x990 kernel/rcu/tree.c:2849
nf_hook_entries_free net/netfilter/core.c:88 [inline]
__nf_register_net_hook+0x788/0x910 net/netfilter/core.c:445
nf_register_net_hook+0xae/0x190 net/netfilter/core.c:566
nf_register_net_hooks+0x40/0x1a0 net/netfilter/core.c:582
nf_ct_netns_do_get+0x20f/0x5b0 net/netfilter/nf_conntrack_proto.c:500
nf_ct_netns_inet_get+0x3b/0x150 net/netfilter/nf_conntrack_proto.c:595
nf_conncount_init+0x123/0x380 net/netfilter/nf_conncount.c:640
ovs_ct_limit_init net/openvswitch/conntrack.c:1902 [inline]
ovs_ct_init+0x312/0x480 net/openvswitch/conntrack.c:2311
ovs_init_net+0x1e2/0x240 net/openvswitch/datapath.c:2613
ops_init+0x355/0x5f0 net/core/net_namespace.c:138
setup_net+0x4f2/0xbd0 net/core/net_namespace.c:336
copy_net_ns+0x348/0x5b0 net/core/net_namespace.c:508
create_new_namespaces+0x3d3/0x6f0 kernel/nsproxy.c:110
copy_namespaces+0x3b0/0x410 kernel/nsproxy.c:178
copy_process+0x19c2/0x4030 kernel/fork.c:2359
kernel_clone+0x24b/0x900 kernel/fork.c:2762
__do_sys_clone kernel/fork.c:2903 [inline]
__se_sys_clone kernel/fork.c:2887 [inline]
__x64_sys_clone+0x1a7/0x220 kernel/fork.c:2887
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
Second to last potentially related work creation:
kasan_save_stack+0x3a/0x60 mm/kasan/common.c:46
__kasan_record_aux_stack+0xb2/0xc0 mm/kasan/generic.c:486
call_rcu+0x14f/0x990 kernel/rcu/tree.c:2849
nf_unregister_net_hook net/netfilter/core.c:-1 [inline]
nf_unregister_net_hooks+0xc7/0x130 net/netfilter/core.c:601
ops_exit_list net/core/net_namespace.c:172 [inline]
setup_net+0x91b/0xbd0 net/core/net_namespace.c:368
copy_net_ns+0x348/0x5b0 net/core/net_namespace.c:508
create_new_namespaces+0x3d3/0x6f0 kernel/nsproxy.c:110
copy_namespaces+0x3b0/0x410 kernel/nsproxy.c:178
copy_process+0x19c2/0x4030 kernel/fork.c:2359
kernel_clone+0x24b/0x900 kernel/fork.c:2762
__do_sys_clone kernel/fork.c:2903 [inline]
__se_sys_clone kernel/fork.c:2887 [inline]
__x64_sys_clone+0x1a7/0x220 kernel/fork.c:2887
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 ffff8880592e5a00
which belongs to the cache kmalloc-cg-64 of size 64
The buggy address is located 16 bytes inside of
64-byte region [ffff8880592e5a00, ffff8880592e5a40)
The buggy address belongs to the physical page:
page:ffffea000164b940 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x592e5
memcg:ffff88802093f801
flags: 0xfff00000000200(slab|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000000200 0000000000000000 dead000000000001 ffff888017442780
raw: 0000000000000000 0000000080200020 00000001ffffffff ffff88802093f801
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 4395, tgid 4395 (syz-executor), ts 117421528126, free_ts 117421276735
set_page_owner include/linux/page_owner.h:31 [inline]
post_alloc_hook+0x173/0x1a0 mm/page_alloc.c:2559
prep_new_page mm/page_alloc.c:2566 [inline]
get_page_from_freelist+0x1a1e/0x1ab0 mm/page_alloc.c:4357
__alloc_pages+0x1ec/0x4f0 mm/page_alloc.c:5657
alloc_slab_page+0x5d/0x160 mm/slub.c:1799
allocate_slab mm/slub.c:1944 [inline]
new_slab+0x87/0x2c0 mm/slub.c:1997
___slab_alloc+0xbc6/0x1240 mm/slub.c:3154
__slab_alloc mm/slub.c:3240 [inline]
slab_alloc_node mm/slub.c:3325 [inline]
__kmem_cache_alloc_node+0x1a0/0x260 mm/slub.c:3398
__do_kmalloc_node mm/slab_common.c:935 [inline]
__kmalloc_node+0xa0/0x240 mm/slab_common.c:943
kmalloc_node include/linux/slab.h:589 [inline]
kvmalloc_node+0x6c/0x180 mm/util.c:581
kvmalloc include/linux/slab.h:716 [inline]
kvzalloc include/linux/slab.h:724 [inline]
allocate_hook_entries_size net/netfilter/core.c:61 [inline]
nf_hook_entries_grow+0x309/0x730 net/netfilter/core.c:128
__nf_register_net_hook+0x2c9/0x910 net/netfilter/core.c:423
nf_register_net_hook+0xae/0x190 net/netfilter/core.c:566
nf_register_net_hooks+0x40/0x1a0 net/netfilter/core.c:582
ip6t_register_table+0x53f/0x7d0 net/ipv6/netfilter/ip6_tables.c:1789
ip6table_filter_table_init+0x71/0xb0 net/ipv6/netfilter/ip6table_filter.c:48
xt_find_table_lock+0x220/0x360 net/netfilter/x_tables.c:1259
page last free stack trace:
reset_page_owner include/linux/page_owner.h:24 [inline]
free_pages_prepare mm/page_alloc.c:1486 [inline]
free_pcp_prepare mm/page_alloc.c:1536 [inline]
free_unref_page_prepare+0x8b4/0x9a0 mm/page_alloc.c:3413
free_unref_page+0x2e/0x3f0 mm/page_alloc.c:3508
__vunmap+0x856/0xa00 mm/vmalloc.c:2726
copy_entries_to_user net/ipv4/netfilter/arp_tables.c:713 [inline]
get_entries net/ipv4/netfilter/arp_tables.c:867 [inline]
do_arpt_get_ctl+0xda2/0x1080 net/ipv4/netfilter/arp_tables.c:1461
nf_getsockopt+0x25e/0x280 net/netfilter/nf_sockopt.c:116
ip_getsockopt+0x19b/0x230 net/ipv4/ip_sockglue.c:1826
__sys_getsockopt+0x1b0/0x230 net/socket.c:2331
__do_sys_getsockopt net/socket.c:2346 [inline]
__se_sys_getsockopt net/socket.c:2343 [inline]
__x64_sys_getsockopt+0xb1/0xc0 net/socket.c:2343
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
Memory state around the buggy address:
ffff8880592e5900: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
ffff8880592e5980: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
>ffff8880592e5a00: 00 00 00 00 00 fc fc fc fc fc fc fc fc fc fc fc
^
ffff8880592e5a80: 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc fc
ffff8880592e5b00: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
==================================================================
----------------
Code disassembly (best guess):
0: c7 44 24 20 00 00 00 movl $0x0,0x20(%rsp)
7: 00
8: 9c pushf
9: 8f 44 24 20 pop 0x20(%rsp)
d: f7 44 24 20 00 02 00 testl $0x200,0x20(%rsp)
14: 00
15: 41 c6 04 07 f8 movb $0xf8,(%r15,%rax,1)
1a: 75 4b jne 0x67
1c: f7 c3 00 02 00 00 test $0x200,%ebx
22: 74 01 je 0x25
24: fb sti
25: bf 01 00 00 00 mov $0x1,%edi
* 2a: e8 df 0d 21 f7 call 0xf7210e0e <-- trapping instruction
2f: 65 8b 05 30 91 ca 75 mov %gs:0x75ca9130(%rip),%eax # 0x75ca9166
36: 85 c0 test %eax,%eax
38: 74 3c je 0x76
3a: 48 rex.W
3b: c7 .byte 0xc7
3c: 04 24 add $0x24,%al
3e: 0e (bad)
3f: 36 ss