================================================================== BUG: KASAN: slab-out-of-bounds in __bpf_get_stackid+0x6c9/0x920 kernel/bpf/stackmap.c:274 Write of size 32 at addr ffff88806420e790 by task syz.1.5371/26766 CPU: 0 PID: 26766 Comm: syz.1.5371 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026 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_a448e89f4c9ad9d1+0x28/0x42 bpf_dispatcher_nop_func include/linux/bpf.h:1012 [inline] __bpf_prog_run include/linux/filter.h:608 [inline] bpf_prog_run include/linux/filter.h:615 [inline] bpf_overflow_handler+0x50b/0x790 kernel/events/core.c:10331 __perf_event_overflow+0x457/0x630 kernel/events/core.c:9506 perf_event_overflow kernel/events/core.c:9527 [inline] perf_swevent_hrtimer+0x472/0x630 kernel/events/core.c:10977 __run_hrtimer kernel/time/hrtimer.c:1751 [inline] __hrtimer_run_queues+0x4e7/0xc90 kernel/time/hrtimer.c:1815 hrtimer_interrupt+0x399/0x980 kernel/time/hrtimer.c:1877 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:__se_sys_ioctl+0x15b/0x170 fs/ioctl.c:856 Code: ff 89 de 83 e6 01 31 ff e8 12 d4 9b ff f6 c3 01 75 07 e8 28 d0 9b ff eb 0d e8 21 d0 9b ff 4c 89 f7 e8 79 96 fb ff 48 63 c5 5b <41> 5c 41 5d 41 5e 41 5f 5d c3 66 2e 0f 1f 84 00 00 00 00 00 90 41 RSP: 0018:ffffc90003ad7ef0 EFLAGS: 00000283 RAX: 0000000000000000 RBX: ffffc90003ad7f20 RCX: 0000000000080000 RDX: ffffc9001be5d000 RSI: 00000000000009c0 RDI: 00000000000009c1 RBP: 0000000000000000 R08: ffff8880490f4077 R09: 1ffff1100921e80e R10: dffffc0000000000 R11: ffffed100921e80f R12: 0000000000000000 R13: 00000000fffffdfd R14: ffff8880490f4000 R15: 0000000000000000 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: 0033:0x7f94d3b9e159 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:00007f94d4ae0028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f94d3e25fa0 RCX: 00007f94d3b9e159 RDX: 0000000000000005 RSI: 0000000040042408 RDI: 0000000000000006 RBP: 00007f94d3c3506b R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f94d3e26038 R14: 00007f94d3e25fa0 R15: 00007ffc1d906128 Allocated by task 26766: 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+0xb2/0x240 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+0x386/0x510 kernel/bpf/stackmap.c:117 find_and_alloc_map kernel/bpf/syscall.c:133 [inline] map_create+0x524/0xff0 kernel/bpf/syscall.c:1149 __sys_bpf+0x38b/0x780 kernel/bpf/syscall.c:5014 __do_sys_bpf kernel/bpf/syscall.c:5136 [inline] __se_sys_bpf kernel/bpf/syscall.c:5134 [inline] __x64_sys_bpf+0x78/0x90 kernel/bpf/syscall.c:5134 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/0x950 kernel/rcu/tree.c:2849 nf_hook_entries_free net/netfilter/core.c:88 [inline] __nf_register_net_hook+0x787/0x910 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 ipvlan_register_nf_hook drivers/net/ipvlan/ipvlan_l3s.c:138 [inline] ipvlan_l3s_register+0x130/0x1d0 drivers/net/ipvlan/ipvlan_l3s.c:210 ipvlan_set_port_mode+0x1a1/0x3f0 drivers/net/ipvlan/ipvlan_main.c:34 ipvlan_link_new+0x732/0xae0 drivers/net/ipvlan/ipvlan_main.c:635 rtnl_newlink_create net/core/rtnetlink.c:3436 [inline] __rtnl_newlink net/core/rtnetlink.c:3656 [inline] rtnl_newlink+0x14b3/0x1f90 net/core/rtnetlink.c:3669 rtnetlink_rcv_msg+0x863/0xfb0 net/core/rtnetlink.c:6166 netlink_rcv_skb+0x1ef/0x440 net/netlink/af_netlink.c:2516 netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline] netlink_unicast+0x7ad/0x920 net/netlink/af_netlink.c:1344 netlink_sendmsg+0x8ad/0xbd0 net/netlink/af_netlink.c:1877 sock_sendmsg_nosec net/socket.c:718 [inline] __sock_sendmsg net/socket.c:730 [inline] __sys_sendto+0x497/0x650 net/socket.c:2153 __do_sys_sendto net/socket.c:2165 [inline] __se_sys_sendto net/socket.c:2161 [inline] __x64_sys_sendto+0xda/0xf0 net/socket.c:2161 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 ffff88806420e780 which belongs to the cache kmalloc-cg-64 of size 64 The buggy address is located 16 bytes inside of 64-byte region [ffff88806420e780, ffff88806420e7c0) The buggy address belongs to the physical page: page:ffffea0001908380 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff88806420ec00 pfn:0x6420e memcg:ffff888027dcec01 flags: 0xfff00000000200(slab|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000000200 ffffea0001e12100 dead000000000005 ffff888017442780 raw: ffff88806420ec00 000000008020001a 00000001ffffffff ffff888027dcec01 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 18186, tgid 18185 (syz.3.3275), ts 773544445425, free_ts 768763579570 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0x173/0x1a0 mm/page_alloc.c:2560 prep_new_page mm/page_alloc.c:2567 [inline] get_page_from_freelist+0x206b/0x2180 mm/page_alloc.c:4358 __alloc_pages+0x1ec/0x4f0 mm/page_alloc.c:5658 alloc_slab_page+0x5d/0x180 mm/slub.c:1799 allocate_slab mm/slub.c:1944 [inline] new_slab+0x87/0x2d0 mm/slub.c:1997 ___slab_alloc+0xbc5/0x1240 mm/slub.c:3154 __slab_alloc mm/slub.c:3240 [inline] slab_alloc_node mm/slub.c:3325 [inline] __kmem_cache_alloc_node+0x126/0x270 mm/slub.c:3398 __do_kmalloc_node mm/slab_common.c:935 [inline] __kmalloc_node+0xa2/0x240 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+0x31a/0x760 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 ops_init+0x360/0x5e0 net/core/net_namespace.c:138 setup_net+0x4f2/0xbd0 net/core/net_namespace.c:336 copy_net_ns+0x33e/0x5b0 net/core/net_namespace.c:508 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1487 [inline] free_pcp_prepare mm/page_alloc.c:1537 [inline] free_unref_page_prepare+0x8e5/0x9e0 mm/page_alloc.c:3414 free_unref_page+0x2e/0x3f0 mm/page_alloc.c:3509 free_slab mm/slub.c:2036 [inline] discard_slab mm/slub.c:2042 [inline] __unfreeze_partials+0x188/0x1e0 mm/slub.c:2591 put_cpu_partial+0x17c/0x250 mm/slub.c:2667 qlink_free mm/kasan/quarantine.c:168 [inline] qlist_free_all+0x76/0xe0 mm/kasan/quarantine.c:187 kasan_quarantine_reduce+0x144/0x160 mm/kasan/quarantine.c:294 __kasan_slab_alloc+0x1e/0x80 mm/kasan/common.c:306 kasan_slab_alloc include/linux/kasan.h:201 [inline] slab_post_alloc_hook+0x4b/0x490 mm/slab.h:737 slab_alloc_node mm/slub.c:3359 [inline] __kmem_cache_alloc_node+0x19d/0x270 mm/slub.c:3398 kmalloc_trace+0x26/0xe0 mm/slab_common.c:1026 kmalloc include/linux/slab.h:563 [inline] kzalloc include/linux/slab.h:699 [inline] copy_verifier_state+0x75d/0xae0 kernel/bpf/verifier.c:1161 push_stack+0x1a5/0x510 kernel/bpf/verifier.c:1237 check_cond_jmp_op+0x9bb/0x2090 kernel/bpf/verifier.c:10476 do_check kernel/bpf/verifier.c:12758 [inline] do_check_common+0x78cc/0xc560 kernel/bpf/verifier.c:14962 do_check_main kernel/bpf/verifier.c:15025 [inline] bpf_check+0x3eb5/0x11010 kernel/bpf/verifier.c:15614 bpf_prog_load+0x100e/0x1530 kernel/bpf/syscall.c:2651 Memory state around the buggy address: ffff88806420e680: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ffff88806420e700: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc >ffff88806420e780: 00 00 00 00 00 fc fc fc fc fc fc fc fc fc fc fc ^ ffff88806420e800: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ffff88806420e880: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ================================================================== ---------------- Code disassembly (best guess): 0: ff 89 de 83 e6 01 decl 0x1e683de(%rcx) 6: 31 ff xor %edi,%edi 8: e8 12 d4 9b ff call 0xff9bd41f d: f6 c3 01 test $0x1,%bl 10: 75 07 jne 0x19 12: e8 28 d0 9b ff call 0xff9bd03f 17: eb 0d jmp 0x26 19: e8 21 d0 9b ff call 0xff9bd03f 1e: 4c 89 f7 mov %r14,%rdi 21: e8 79 96 fb ff call 0xfffb969f 26: 48 63 c5 movslq %ebp,%rax 29: 5b pop %rbx * 2a: 41 5c pop %r12 <-- trapping instruction 2c: 41 5d pop %r13 2e: 41 5e pop %r14 30: 41 5f pop %r15 32: 5d pop %rbp 33: c3 ret 34: 66 2e 0f 1f 84 00 00 cs nopw 0x0(%rax,%rax,1) 3b: 00 00 00 3e: 90 nop 3f: 41 rex.B