================================================================== BUG: KASAN: slab-out-of-bounds in __bpf_get_stackid+0x6c7/0x900 kernel/bpf/stackmap.c:271 Write of size 72 at addr ffff888041b77410 by task syz.5.4088/23392 CPU: 0 PID: 23392 Comm: syz.5.4088 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2026 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+0x6c7/0x900 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_6611c23d801ea08d+0x29/0x3e bpf_dispatcher_nop_func include/linux/bpf.h:1226 [inline] __bpf_prog_run include/linux/filter.h:617 [inline] bpf_prog_run include/linux/filter.h:624 [inline] bpf_overflow_handler+0x1fc/0x510 kernel/events/core.c:10584 __perf_event_overflow+0x461/0x660 kernel/events/core.c:9720 perf_swevent_overflow+0x274/0x340 kernel/events/core.c:9803 perf_swevent_event+0x45c/0x570 kernel/events/core.c:-1 do_perf_sw_event kernel/events/core.c:9967 [inline] ___perf_sw_event+0x4ab/0x730 kernel/events/core.c:9998 __perf_sw_event+0x139/0x270 kernel/events/core.c:10010 perf_sw_event include/linux/perf_event.h:1447 [inline] do_user_addr_fault+0x1242/0x12d0 arch/x86/mm/fault.c:1278 handle_page_fault arch/x86/mm/fault.c:1463 [inline] exc_page_fault+0x64/0x100 arch/x86/mm/fault.c:1516 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:608 RIP: 0010:rep_movs_alternative+0x15/0x90 arch/x86/lib/copy_user_64.S:44 Code: 8b 1c 24 4c 8b 64 24 08 48 83 c4 10 c3 cc cc cc cc cc cc cc cc f3 0f 1e fa 48 83 f9 40 73 40 83 f9 08 73 21 85 c9 74 0f 8a 06 <88> 07 48 ff c7 48 ff c6 48 ff c9 75 f1 c3 66 2e 0f 1f 84 00 00 00 RSP: 0018:ffffc9000be0fad0 EFLAGS: 00050202 RAX: ffffffff8434c50f RBX: 0000000000000004 RCX: 0000000000000004 RDX: 0000000000000000 RSI: ffffc9000be0fb80 RDI: 00002000000007cc RBP: ffffc9000be0fc20 R08: 0000000000000003 R09: 0000000000000004 R10: dffffc0000000000 R11: fffff520017c1f70 R12: 00002000000007d0 R13: dffffc0000000000 R14: 00002000000007cc R15: ffffc9000be0fb80 copy_user_generic arch/x86/include/asm/uaccess_64.h:112 [inline] raw_copy_to_user arch/x86/include/asm/uaccess_64.h:133 [inline] _copy_to_user+0x85/0xa0 lib/usercopy.c:41 copy_to_user include/linux/uaccess.h:191 [inline] bpf_test_finish+0x19f/0x650 net/bpf/test_run.c:490 bpf_prog_test_run_skb+0x1135/0x18f0 net/bpf/test_run.c:1123 bpf_prog_test_run+0x31f/0x390 kernel/bpf/syscall.c:4140 __sys_bpf+0x49d/0x890 kernel/bpf/syscall.c:5512 __do_sys_bpf kernel/bpf/syscall.c:5598 [inline] __se_sys_bpf kernel/bpf/syscall.c:5596 [inline] __x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:5596 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7f9428d9e559 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:00007f9429d33028 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 RAX: ffffffffffffffda RBX: 00007f9429025fa0 RCX: 00007f9428d9e559 RDX: 0000000000000050 RSI: 00002000000007c0 RDI: 000000000000000a RBP: 00007f9428e35ab8 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f9429026038 R14: 00007f9429025fa0 R15: 00007ffca6f9a4f8 Allocated by task 23392: 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+0xb6/0x240 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+0x32b/0x4b0 kernel/bpf/stackmap.c:114 map_create+0x877/0x12f0 kernel/bpf/syscall.c:1247 __sys_bpf+0x651/0x890 kernel/bpf/syscall.c:5476 __do_sys_bpf kernel/bpf/syscall.c:5598 [inline] __se_sys_bpf kernel/bpf/syscall.c:5596 [inline] __x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:5596 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x68/0xd2 The buggy address belongs to the object at ffff888041b77400 which belongs to the cache kmalloc-cg-64 of size 64 The buggy address is located 16 bytes inside of allocated 40-byte region [ffff888041b77400, ffff888041b77428) The buggy address belongs to the physical page: page:ffffea000106ddc0 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff888041b77800 pfn:0x41b77 memcg:ffff88805bfc3a01 flags: 0xfff00000000800(slab|node=0|zone=1|lastcpupid=0x7ff) page_type: 0xffffffff() raw: 00fff00000000800 ffff88801884da00 ffffea0000c67b00 0000000000000006 raw: ffff888041b77800 000000008020001e 00000001ffffffff ffff88805bfc3a01 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 21624, tgid 21623 (syz.4.3633), ts 914104030294, free_ts 914088698125 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0x1c1/0x200 mm/page_alloc.c:1582 prep_new_page mm/page_alloc.c:1589 [inline] get_page_from_freelist+0x2181/0x22a0 mm/page_alloc.c:3221 __alloc_pages+0x1f0/0x460 mm/page_alloc.c:4501 alloc_slab_page+0x5d/0x180 mm/slub.c:1881 allocate_slab mm/slub.c:2028 [inline] new_slab+0x87/0x2d0 mm/slub.c:2081 ___slab_alloc+0xc5c/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+0x11f/0x250 mm/slub.c:3534 __do_kmalloc_node mm/slab_common.c:1006 [inline] __kmalloc_node+0xa6/0x240 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_try_shrink+0x336/0x700 net/netfilter/core.c:260 __nf_unregister_net_hook+0x4da/0x6d0 net/netfilter/core.c:520 nf_unregister_net_hook net/netfilter/core.c:-1 [inline] nf_unregister_net_hooks+0xcb/0x130 net/netfilter/core.c:613 nf_ct_netns_do_put net/netfilter/nf_conntrack_proto.c:549 [inline] nf_ct_netns_put+0x36d/0x520 net/netfilter/nf_conntrack_proto.c:-1 nf_conncount_destroy+0x41/0x150 net/netfilter/nf_conncount.c:687 ovs_ct_limit_exit_finish net/openvswitch/conntrack.c:1626 [inline] ovs_ct_exit_finish+0xa5/0x210 net/openvswitch/conntrack.c:2050 ovs_exit_net+0xed/0x7a0 net/openvswitch/datapath.c:2751 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1182 [inline] free_unref_page_prepare+0x7d7/0x8f0 mm/page_alloc.c:2366 free_unref_page+0x32/0x2e0 mm/page_alloc.c:2459 __slab_free+0x35a/0x400 mm/slub.c:3736 qlink_free mm/kasan/quarantine.c:166 [inline] qlist_free_all+0x75/0xd0 mm/kasan/quarantine.c:185 kasan_quarantine_reduce+0x143/0x160 mm/kasan/quarantine.c:292 __kasan_slab_alloc+0x22/0x80 mm/kasan/common.c:306 kasan_slab_alloc include/linux/kasan.h:188 [inline] slab_post_alloc_hook+0x6a/0x4d0 mm/slab.h:770 slab_alloc_node mm/slub.c:3495 [inline] kmem_cache_alloc_node+0x1af/0x310 mm/slub.c:3540 __alloc_skb+0x103/0x2c0 net/core/skbuff.c:643 alloc_skb_fclone include/linux/skbuff.h:1366 [inline] tipc_buf_acquire net/tipc/msg.c:72 [inline] tipc_msg_build+0x163/0xe60 net/tipc/msg.c:402 __tipc_sendstream+0x8fb/0x1290 net/tipc/socket.c:1624 tipc_sendstream+0x55/0x70 net/tipc/socket.c:1555 sock_sendmsg_nosec net/socket.c:730 [inline] __sock_sendmsg net/socket.c:745 [inline] ____sys_sendmsg+0x61b/0x980 net/socket.c:2595 ___sys_sendmsg+0x2a6/0x360 net/socket.c:2649 __sys_sendmsg net/socket.c:2678 [inline] __do_sys_sendmsg net/socket.c:2687 [inline] __se_sys_sendmsg+0x1d0/0x2c0 net/socket.c:2685 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:76 Memory state around the buggy address: ffff888041b77300: 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc fc ffff888041b77380: 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc fc >ffff888041b77400: 00 00 00 00 00 fc fc fc fc fc fc fc fc fc fc fc ^ ffff888041b77480: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ffff888041b77500: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ================================================================== ---------------- Code disassembly (best guess): 0: 8b 1c 24 mov (%rsp),%ebx 3: 4c 8b 64 24 08 mov 0x8(%rsp),%r12 8: 48 83 c4 10 add $0x10,%rsp c: c3 ret d: cc int3 e: cc int3 f: cc int3 10: cc int3 11: cc int3 12: cc int3 13: cc int3 14: cc int3 15: f3 0f 1e fa endbr64 19: 48 83 f9 40 cmp $0x40,%rcx 1d: 73 40 jae 0x5f 1f: 83 f9 08 cmp $0x8,%ecx 22: 73 21 jae 0x45 24: 85 c9 test %ecx,%ecx 26: 74 0f je 0x37 28: 8a 06 mov (%rsi),%al * 2a: 88 07 mov %al,(%rdi) <-- trapping instruction 2c: 48 ff c7 inc %rdi 2f: 48 ff c6 inc %rsi 32: 48 ff c9 dec %rcx 35: 75 f1 jne 0x28 37: c3 ret 38: 66 data16 39: 2e cs 3a: 0f .byte 0xf 3b: 1f (bad) 3c: 84 00 test %al,(%rax)