netlink: 2418 bytes leftover after parsing attributes in process `syz.3.4130'. ================================================================== BUG: KASAN: slab-out-of-bounds in __bpf_get_stackid+0x6bf/0x900 kernel/bpf/stackmap.c:271 Write of size 32 at addr ffff88805e67a160 by task syz.3.4130/20780 CPU: 0 PID: 20780 Comm: syz.3.4130 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026 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:374 [inline] bpf_get_stackid_pe+0x2f0/0x410 kernel/bpf/stackmap.c:331 bpf_prog_620e6a2847f43590+0x33/0x48 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_swevent_overflow kernel/events/core.c:9803 [inline] perf_swevent_event+0x319/0x570 kernel/events/core.c:9854 do_perf_sw_event kernel/events/core.c:9967 [inline] ___perf_sw_event+0x4a7/0x730 kernel/events/core.c:9998 __perf_sw_event+0x139/0x270 kernel/events/core.c:10010 perf_sw_event include/linux/perf_event.h:1442 [inline] do_user_addr_fault+0x123e/0x12c0 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: 0033:0x7ffde61d5a21 Code: 48 89 c2 eb a7 4c 29 d2 48 0f ba e2 3e 0f 82 ad 00 00 00 48 bf ff ff ff ff ff ff ff 7f 48 21 fa 49 0f af d1 48 01 c2 48 d3 ea <48> 89 55 c0 31 c0 48 81 fa 00 ca 9a 3b 72 1c 31 c9 48 81 c2 00 36 RSP: 002b:00007f4e63667ff0 EFLAGS: 00010203 RAX: 001e208a745a51a2 RBX: 00007ffde61d10b0 RCX: 0000000000000018 RDX: 000000001e9e3152 RSI: 00007f4e636680b0 RDI: 7fffffffffffffff RBP: 00007f4e63668030 R08: 00000000000002cd R09: 0000000000745aae R10: 00000173e249f7d9 R11: 00000000000225be R12: 0000000000000010 R13: 00007f4e62a16038 R14: 00007ffde61d1080 R15: 00000000000225be Allocated by task 20780: 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+0x55/0xb0 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 inet_free_ifa net/ipv4/devinet.c:234 [inline] inetdev_destroy net/ipv4/devinet.c:325 [inline] inetdev_event+0x684/0x1630 net/ipv4/devinet.c:1636 notifier_call_chain+0x197/0x380 kernel/notifier.c:93 call_netdevice_notifiers_extack net/core/dev.c:2077 [inline] call_netdevice_notifiers net/core/dev.c:2091 [inline] unregister_netdevice_many_notify+0x100d/0x1900 net/core/dev.c:11124 unregister_netdevice_many net/core/dev.c:11180 [inline] default_device_exit_batch+0x9ee/0xa80 net/core/dev.c:11658 ops_exit_list net/core/net_namespace.c:178 [inline] cleanup_net+0x795/0xbb0 net/core/net_namespace.c:652 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 The buggy address belongs to the object at ffff88805e67a100 which belongs to the cache kmalloc-cg-128 of size 128 The buggy address is located 96 bytes inside of allocated 120-byte region [ffff88805e67a100, ffff88805e67a178) The buggy address belongs to the physical page: page:ffffea0001799e80 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x5e67a memcg:ffff88805e892a01 flags: 0xfff00000000800(slab|node=0|zone=1|lastcpupid=0x7ff) page_type: 0xffffffff() raw: 00fff00000000800 ffff888017c4dc80 dead000000000100 dead000000000122 raw: 0000000000000000 0000000080100010 00000001ffffffff ffff88805e892a01 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 5769, tgid 5769 (syz-executor), ts 72755156116, free_ts 72752119604 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_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 kmalloc_trace+0x2a/0xe0 mm/slab_common.c:1098 kmalloc include/linux/slab.h:600 [inline] kzalloc include/linux/slab.h:721 [inline] inet_alloc_ifa net/ipv4/devinet.c:221 [inline] rtm_to_ifaddr net/ipv4/devinet.c:878 [inline] inet_rtm_newaddr+0x483/0x1ae0 net/ipv4/devinet.c:967 rtnetlink_rcv_msg+0x869/0xfa0 net/core/rtnetlink.c:6476 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+0x55/0xb0 arch/x86/entry/common.c:76 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 tlb_batch_list_free mm/mmu_gather.c:115 [inline] tlb_finish_mmu+0x144/0x220 mm/mmu_gather.c:428 exit_mmap+0x428/0xb90 mm/mmap.c:3315 __mmput+0x118/0x3c0 kernel/fork.c:1357 exit_mm+0x24a/0x350 kernel/exit.c:570 do_exit+0x8dd/0x2460 kernel/exit.c:871 do_group_exit+0x21b/0x2d0 kernel/exit.c:1026 __do_sys_exit_group kernel/exit.c:1037 [inline] __se_sys_exit_group kernel/exit.c:1035 [inline] __x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1035 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 Memory state around the buggy address: ffff88805e67a000: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88805e67a080: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff88805e67a100: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 fc ^ ffff88805e67a180: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88805e67a200: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================