==================================================================
BUG: KASAN: slab-out-of-bounds in __bpf_get_stackid+0x6bf/0x900 kernel/bpf/stackmap.c:271
Write of size 40 at addr ffff88802d507190 by task syz.2.1083/9725
CPU: 1 PID: 9725 Comm: syz.2.1083 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026
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_a448e89f4c9ad9d1+0x30/0x4a
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:10584
__perf_event_overflow+0x447/0x630 kernel/events/core.c:9720
perf_event_overflow kernel/events/core.c:9741 [inline]
perf_swevent_hrtimer+0x439/0x610 kernel/events/core.c:11230
__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:arch_atomic64_dec_and_test arch/x86/include/asm/atomic64_64.h:61 [inline]
RIP: 0010:raw_atomic64_dec_and_test include/linux/atomic/atomic-arch-fallback.h:4369 [inline]
RIP: 0010:raw_atomic_long_dec_and_test include/linux/atomic/atomic-long.h:1563 [inline]
RIP: 0010:atomic_long_dec_and_test include/linux/atomic/atomic-instrumented.h:4504 [inline]
RIP: 0010:fput+0x29/0x1a0 fs/file_table.c:435
Code: 00 f3 0f 1e fa 55 41 57 41 56 41 54 53 48 89 fb e8 5c 3b 98 ff 48 8d 7b 58 be 08 00 00 00 e8 0e 74 f0 ff 31 f6 f0 48 ff 4b 58 <40> 0f 94 c5 40 0f 94 c6 bf 02 00 00 00 e8 c5 3d 98 ff 40 84 ed 0f
RSP: 0018:ffffc90003aa7eb8 EFLAGS: 00000202
RAX: ffffffff81eee601 RBX: ffff88801e750500 RCX: ffffffff81eee682
RDX: 0000000000000001 RSI: 0000000000000000 RDI: ffff88801e750558
RBP: 0000000000000000 R08: ffff88801e75055f R09: 1ffff11003cea0ab
R10: dffffc0000000000 R11: ffffed1003cea0ac R12: 0000000000000000
R13: 00000000fffffdfd R14: ffff88801e750500 R15: 0000000000000000
fdput include/linux/file.h:46 [inline]
__do_sys_ioctl fs/ioctl.c:874 [inline]
__se_sys_ioctl+0x15a/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: 0033:0x7f5e4eb9c819
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:00007f5e4f98f028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f5e4ee15fa0 RCX: 00007f5e4eb9c819
RDX: 000000000000000a RSI: 0000000040042408 RDI: 000000000000000b
RBP: 00007f5e4ec32c91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f5e4ee16038 R14: 00007f5e4ee15fa0 R15: 00007fffba9764f8
Allocated by task 9725:
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:5459
__do_sys_bpf kernel/bpf/syscall.c:5581 [inline]
__se_sys_bpf kernel/bpf/syscall.c:5579 [inline]
__x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:5579
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_hook_entries_free net/netfilter/core.c:88 [inline]
__nf_register_net_hook+0x788/0x910 net/netfilter/core.c:457
nf_register_net_hook+0xb2/0x190 net/netfilter/core.c:578
nf_register_net_hooks+0x44/0x1b0 net/netfilter/core.c:594
ipt_register_table+0x53d/0x7d0 net/ipv4/netfilter/ip_tables.c:1781
iptable_mangle_table_init+0x41/0x60 net/ipv4/netfilter/iptable_mangle.c:91
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
nf_getsockopt+0x262/0x280 net/netfilter/nf_sockopt.c:116
ip_getsockopt+0x19f/0x230 net/ipv4/ip_sockglue.c:1790
do_sock_getsockopt+0x379/0x450 net/socket.c:2383
__sys_getsockopt net/socket.c:2412 [inline]
__do_sys_getsockopt net/socket.c:2422 [inline]
__se_sys_getsockopt net/socket.c:2419 [inline]
__x64_sys_getsockopt+0x1d6/0x280 net/socket.c:2419
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
Second to 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_hook_entries_free net/netfilter/core.c:88 [inline]
__nf_register_net_hook+0x788/0x910 net/netfilter/core.c:457
nf_register_net_hook+0xb2/0x190 net/netfilter/core.c:578
nf_register_net_hooks+0x44/0x1b0 net/netfilter/core.c:594
ipvlan_register_nf_hook drivers/net/ipvlan/ipvlan_l3s.c:138 [inline]
ipvlan_l3s_register+0x134/0x1d0 drivers/net/ipvlan/ipvlan_l3s.c:210
ipvlan_set_port_mode+0x195/0x3f0 drivers/net/ipvlan/ipvlan_main.c:34
ipvlan_link_new+0x710/0xa90 drivers/net/ipvlan/ipvlan_main.c:633
rtnl_newlink_create net/core/rtnetlink.c:3520 [inline]
__rtnl_newlink net/core/rtnetlink.c:3740 [inline]
rtnl_newlink+0x1542/0x20a0 net/core/rtnetlink.c:3753
rtnetlink_rcv_msg+0x869/0xfa0 net/core/rtnetlink.c:6475
netlink_rcv_skb+0x241/0x4d0 net/netlink/af_netlink.c:2545
netlink_unicast_kernel net/netlink/af_netlink.c:1320 [inline]
netlink_unicast+0x751/0x8d0 net/netlink/af_netlink.c:1346
netlink_sendmsg+0x8d0/0xbf0 net/netlink/af_netlink.c:1894
sock_sendmsg_nosec net/socket.c:730 [inline]
__sock_sendmsg net/socket.c:745 [inline]
__sys_sendto+0x4a9/0x6b0 net/socket.c:2200
__do_sys_sendto net/socket.c:2212 [inline]
__se_sys_sendto net/socket.c:2208 [inline]
__x64_sys_sendto+0xde/0xf0 net/socket.c:2208
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
The buggy address belongs to the object at ffff88802d507180
which belongs to the cache kmalloc-cg-64 of size 64
The buggy address is located 16 bytes inside of
allocated 40-byte region [ffff88802d507180, ffff88802d5071a8)
The buggy address belongs to the physical page:
page:ffffea0000b541c0 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x2d507
memcg:ffff88801eae2601
flags: 0xfff00000000800(slab|node=0|zone=1|lastcpupid=0x7ff)
page_type: 0xffffffff()
raw: 00fff00000000800 ffff888017c4da00 ffffea0000c79140 0000000000000004
raw: 0000000000000000 0000000080200020 00000001ffffffff ffff88801eae2601
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 0, migratetype Unmovable, gfp_mask 0x12cc0(GFP_KERNEL|__GFP_NOWARN|__GFP_NORETRY), pid 1, tgid 1 (swapper/0), ts 23085428303, free_ts 23056675465
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_page_interleave+0x24/0x1e0 mm/mempolicy.c:2118
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_register_net_hook+0x2c9/0x910 net/netfilter/core.c:435
nf_register_net_hook+0xb2/0x190 net/netfilter/core.c:578
nf_register_net_hooks+0x44/0x1b0 net/netfilter/core.c:594
nf_defrag_ipv4_enable+0x87/0x110 net/ipv4/netfilter/nf_defrag_ipv4.c:160
nf_ct_netns_do_get+0x18d/0x5c0 net/netfilter/nf_conntrack_proto.c:451
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+0x32/0x2e0 mm/page_alloc.c:2458
vfree+0x1a6/0x320 mm/vmalloc.c:2868
delayed_vfree_work+0x55/0x80 mm/vmalloc.c:2788
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
Memory state around the buggy address:
ffff88802d507080: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
ffff88802d507100: 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc fc
>ffff88802d507180: 00 00 00 00 00 fc fc fc fc fc fc fc fc fc fc fc
^
ffff88802d507200: 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc fc
ffff88802d507280: 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc fc
==================================================================
----------------
Code disassembly (best guess):
0: 00 f3 add %dh,%bl
2: 0f 1e fa nop %edx
5: 55 push %rbp
6: 41 57 push %r15
8: 41 56 push %r14
a: 41 54 push %r12
c: 53 push %rbx
d: 48 89 fb mov %rdi,%rbx
10: e8 5c 3b 98 ff call 0xff983b71
15: 48 8d 7b 58 lea 0x58(%rbx),%rdi
19: be 08 00 00 00 mov $0x8,%esi
1e: e8 0e 74 f0 ff call 0xfff07431
23: 31 f6 xor %esi,%esi
25: f0 48 ff 4b 58 lock decq 0x58(%rbx)
* 2a: 40 0f 94 c5 sete %bpl <-- trapping instruction
2e: 40 0f 94 c6 sete %sil
32: bf 02 00 00 00 mov $0x2,%edi
37: e8 c5 3d 98 ff call 0xff983e01
3c: 40 84 ed test %bpl,%bpl
3f: 0f .byte 0xf