==================================================================
BUG: KASAN: slab-out-of-bounds in __bpf_get_stackid+0x6fa/0x960 kernel/bpf/stackmap.c:274
Write of size 88 at addr ffff888133d7d110 by task syz.0.117/768
CPU: 0 PID: 768 Comm: syz.0.117 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_3150bcfa38b8be26+0x21/0x39
bpf_dispatcher_nop_func include/linux/bpf.h:987 [inline]
__bpf_prog_run include/linux/filter.h:607 [inline]
bpf_prog_run include/linux/filter.h:614 [inline]
bpf_overflow_handler+0x3d0/0x5e0 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:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline]
RIP: 0010:_raw_spin_unlock_irqrestore+0x55/0x80 kernel/locking/spinlock.c:194
Code: c0 d4 0d 87 e8 6c 09 b5 fc 4c 89 f7 48 83 3d c1 cc 0b 02 00 74 30 e8 9e 0d 00 00 90 f7 c3 00 02 00 00 74 01 fb bf 01 00 00 00 d6 9c 4a fc 65 8b 05 a7 65 00 7b 85 c0 74 05 5b 41 5e 5d c3 e8
RSP: 0018:ffffc90000797a90 EFLAGS: 00000206
RAX: 0000000000000001 RBX: 0000000000000a06 RCX: dffffc0000000000
RDX: ffffc900012b9000 RSI: 0000000000000a06 RDI: 0000000000000001
RBP: ffffc90000797aa0 R08: ffffffff8792e42f R09: 1ffffffff0f25c85
R10: dffffc0000000000 R11: fffffbfff0f25c86 R12: 1ffff11023332512
R13: 0000000000000000 R14: ffff8881f6e37d80 R15: ffff888119992894
try_to_wake_up+0x5d5/0x1220 kernel/sched/core.c:4394
wake_up_process kernel/sched/core.c:4528 [inline]
wake_up_q+0xdc/0x1b0 kernel/sched/core.c:1032
futex_wake+0x5e9/0x8e0 kernel/futex/waitwake.c:188
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: 0033:0x7f08b599cdd9
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:00007f08b692a0e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: ffffffffffffffda RBX: 00007f08b5c15fa8 RCX: 00007f08b599cdd9
RDX: 00000000000f4240 RSI: 0000000000000081 RDI: 00007f08b5c15fac
RBP: 00007f08b5c15fa0 R08: 00140d92468b713c R09: 0000000000000000
R10: ffffffffffffffff R11: 0000000000000246 R12: 0000000000000000
R13: 00007f08b5c16038 R14: 00007ffec8447bb0 R15: 00007ffec8447c98
Allocated by task 768:
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 ffff888133d7d100
which belongs to the cache kmalloc-64 of size 64
The buggy address is located 16 bytes inside of
64-byte region [ffff888133d7d100, ffff888133d7d140)
The buggy address belongs to the physical page:
page:ffffea0004cf5f40 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x133d7d
flags: 0x4000000000000200(slab|zone=1)
raw: 4000000000000200 ffffea000458de40 dead000000000007 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 291, tgid 291 (syz-executor), ts 30338017679, free_ts 30337903033
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
kmalloc_node_trace+0x26/0xb0 mm/slab_common.c:1041
kmalloc_node include/linux/slab.h:585 [inline]
kzalloc_node include/linux/slab.h:710 [inline]
__get_vm_area_node+0x12c/0x360 mm/vmalloc.c:2515
__vmalloc_node_range+0x326/0x1430 mm/vmalloc.c:3216
__vmalloc_node mm/vmalloc.c:3321 [inline]
vzalloc+0x78/0x90 mm/vmalloc.c:3394
alloc_counters+0x66/0x530 net/ipv4/netfilter/ip_tables.c:801
copy_entries_to_user net/ipv6/netfilter/ip6_tables.c:839 [inline]
get_entries net/ipv6/netfilter/ip6_tables.c:1041 [inline]
do_ip6t_get_ctl+0xa74/0x1190 net/ipv6/netfilter/ip6_tables.c:1679
nf_getsockopt+0x27f/0x2a0 net/netfilter/nf_sockopt.c:116
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
__vunmap+0x9c0/0xb80 mm/vmalloc.c:2739
__vfree mm/vmalloc.c:2788 [inline]
vfree+0x61/0x90 mm/vmalloc.c:2819
copy_entries_to_user net/ipv4/netfilter/ip_tables.c:868 [inline]
get_entries net/ipv4/netfilter/ip_tables.c:1024 [inline]
do_ipt_get_ctl+0xe9c/0x1180 net/ipv4/netfilter/ip_tables.c:1670
nf_getsockopt+0x27f/0x2a0 net/netfilter/nf_sockopt.c:116
ip_getsockopt+0x157/0x1e0 net/ipv4/ip_sockglue.c:1826
tcp_getsockopt+0xff/0x130 net/ipv4/tcp.c:4463
sock_common_getsockopt+0xaa/0xc0 net/core/sock.c:3680
__sys_getsockopt+0x215/0x4a0 net/socket.c:2321
__do_sys_getsockopt net/socket.c:2336 [inline]
__se_sys_getsockopt net/socket.c:2333 [inline]
__x64_sys_getsockopt+0xbf/0xd0 net/socket.c:2333
x64_sys_call+0x3d/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:56
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:
ffff888133d7d000: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc
ffff888133d7d080: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
>ffff888133d7d100: 00 00 00 00 00 fc fc fc fc fc fc fc fc fc fc fc
^
ffff888133d7d180: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
ffff888133d7d200: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
==================================================================
----------------
Code disassembly (best guess):
0: c0 d4 0d rcl $0xd,%ah
3: 87 e8 xchg %ebp,%eax
5: 6c insb (%dx),%es:(%rdi)
6: 09 b5 fc 4c 89 f7 or %esi,-0x876b304(%rbp)
c: 48 83 3d c1 cc 0b 02 cmpq $0x0,0x20bccc1(%rip) # 0x20bccd5
13: 00
14: 74 30 je 0x46
16: e8 9e 0d 00 00 call 0xdb9
1b: 90 nop
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 d6 9c 4a fc call 0xfc4a9d05 <-- trapping instruction
2f: 65 8b 05 a7 65 00 7b mov %gs:0x7b0065a7(%rip),%eax # 0x7b0065dd
36: 85 c0 test %eax,%eax
38: 74 05 je 0x3f
3a: 5b pop %rbx
3b: 41 5e pop %r14
3d: 5d pop %rbp
3e: c3 ret
3f: e8 .byte 0xe8