================================================================== BUG: KASAN: slab-out-of-bounds in __bpf_get_stackid+0x6fa/0x960 kernel/bpf/stackmap.c:274 Write of size 144 at addr ffff888111bd9110 by task syz.0.2398/7534 CPU: 1 PID: 7534 Comm: syz.0.2398 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026 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_a448e89f4c9ad9d1+0x28/0x42 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:fib_table_flush+0x546/0x1580 net/ipv4/fib_trie.c:2051 Code: 48 8b 1b 48 85 db 0f 84 40 0a 00 00 4c 89 7c 24 30 c7 44 24 48 00 00 00 00 48 89 d8 48 c1 e8 03 48 89 44 24 38 42 80 3c 20 00 <74> 08 48 89 df e8 60 9f 72 fd 48 8b 03 48 89 44 24 40 4c 8d 7b 10 RSP: 0018:ffffc9000236f540 EFLAGS: 00000246 RAX: 1ffff110223e469a RBX: ffff888111f234d0 RCX: 0000000000080000 RDX: ffffc9000dd31000 RSI: 000000000000921d RDI: 000000000000921e RBP: ffffc9000236f6c0 R08: ffff888113325100 R09: 0000000000000003 R10: 0000000000000006 R11: 0000000000000002 R12: dffffc0000000000 R13: ffff888133355260 R14: ffff8881098abf20 R15: 0000000000000008 fib_flush net/ipv4/fib_frontend.c:195 [inline] fib_disable_ip net/ipv4/fib_frontend.c:1440 [inline] fib_netdev_event+0x3e1/0x5b0 net/ipv4/fib_frontend.c:1509 notifier_call_chain kernel/notifier.c:87 [inline] raw_notifier_call_chain+0xa1/0x110 kernel/notifier.c:455 call_netdevice_notifiers_info net/core/dev.c:2022 [inline] call_netdevice_notifiers_extack net/core/dev.c:2060 [inline] call_netdevice_notifiers net/core/dev.c:2074 [inline] dev_close_many+0x32e/0x4d0 net/core/dev.c:1622 vlan_device_event+0x117c/0x1bb0 net/8021q/vlan.c:452 notifier_call_chain kernel/notifier.c:87 [inline] raw_notifier_call_chain+0xa1/0x110 kernel/notifier.c:455 call_netdevice_notifiers_info net/core/dev.c:2022 [inline] call_netdevice_notifiers_extack net/core/dev.c:2060 [inline] call_netdevice_notifiers net/core/dev.c:2074 [inline] __dev_notify_flags+0x241/0x560 net/core/dev.c:8732 dev_change_flags+0xe8/0x1a0 net/core/dev.c:8768 dev_ifsioc+0x130/0xd80 net/core/dev_ioctl.c:326 dev_ioctl+0x53c/0xcf0 net/core/dev_ioctl.c:572 sock_do_ioctl+0x252/0x330 net/socket.c:1205 sock_ioctl+0x4bd/0x710 net/socket.c:1310 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:870 [inline] __se_sys_ioctl+0x12f/0x1b0 fs/ioctl.c:856 __x64_sys_ioctl+0x7b/0x90 fs/ioctl.c:856 x64_sys_call+0x58b/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:17 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: 0033:0x7f69a179ce59 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:00007f69a25e8028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f69a1a15fa0 RCX: 00007f69a179ce59 RDX: 0000200000000000 RSI: 0000000000008914 RDI: 0000000000000005 RBP: 00007f69a1832d6f R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f69a1a16038 R14: 00007f69a1a15fa0 R15: 00007ffcbecc4b58 Allocated by task 7543: 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 ffff888111bd9100 which belongs to the cache kmalloc-64 of size 64 The buggy address is located 16 bytes inside of 64-byte region [ffff888111bd9100, ffff888111bd9140) The buggy address belongs to the physical page: page:ffffea000446f640 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x111bd9 flags: 0x4000000000000200(slab|zone=1) raw: 4000000000000200 ffffea0004343d00 dead000000000004 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 652, tgid 650 (syz.1.109), ts 37536469320, free_ts 37530890063 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:5929 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 __do_kmalloc_node mm/slab_common.c:937 [inline] __kmalloc_node_track_caller+0xa0/0x1e0 mm/slab_common.c:958 __do_krealloc mm/slab_common.c:1341 [inline] krealloc+0x6f/0x110 mm/slab_common.c:1374 copy_array kernel/bpf/verifier.c:955 [inline] copy_verifier_state+0xd7/0xab0 kernel/bpf/verifier.c:1139 push_stack+0x19b/0x4f0 kernel/bpf/verifier.c:1237 check_cond_jmp_op kernel/bpf/verifier.c:10492 [inline] do_check+0x963a/0xf070 kernel/bpf/verifier.c:12736 do_check_common+0x11ae/0x1950 kernel/bpf/verifier.c:14940 do_check_main kernel/bpf/verifier.c:15003 [inline] bpf_check+0x3f98/0x10d10 kernel/bpf/verifier.c:15580 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:6019 __free_slab+0xca/0x1a0 mm/slub.c:2044 free_slab mm/slub.c:2059 [inline] discard_slab mm/slub.c:2065 [inline] __unfreeze_partials+0x160/0x190 mm/slub.c:2614 put_cpu_partial+0xa9/0x100 mm/slub.c:2690 __slab_free+0x1c4/0x280 mm/slub.c:3589 do_slab_free mm/slub.c:3666 [inline] ___cache_free+0xbf/0xd0 mm/slub.c:3722 qlink_free mm/kasan/quarantine.c:168 [inline] qlist_free_all+0xc6/0x140 mm/kasan/quarantine.c:187 kasan_quarantine_reduce+0x14a/0x170 mm/kasan/quarantine.c:294 ____kasan_kmalloc mm/kasan/common.c:346 [inline] __kasan_krealloc+0x9a/0x140 mm/kasan/common.c:448 kasan_krealloc include/linux/kasan.h:232 [inline] __do_krealloc mm/slab_common.c:1337 [inline] krealloc+0xc7/0x110 mm/slab_common.c:1374 push_jmp_history kernel/bpf/verifier.c:2462 [inline] is_state_visited kernel/bpf/verifier.c:12321 [inline] do_check+0x2d42/0xf070 kernel/bpf/verifier.c:12461 do_check_common+0x11ae/0x1950 kernel/bpf/verifier.c:14940 do_check_main kernel/bpf/verifier.c:15003 [inline] bpf_check+0x3f98/0x10d10 kernel/bpf/verifier.c:15580 bpf_prog_load+0x10f0/0x16a0 kernel/bpf/syscall.c:2624 Memory state around the buggy address: ffff888111bd9000: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ffff888111bd9080: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc >ffff888111bd9100: 00 00 00 00 00 fc fc fc fc fc fc fc fc fc fc fc ^ ffff888111bd9180: 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc fc ffff888111bd9200: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ================================================================== ---------------- Code disassembly (best guess): 0: 48 8b 1b mov (%rbx),%rbx 3: 48 85 db test %rbx,%rbx 6: 0f 84 40 0a 00 00 je 0xa4c c: 4c 89 7c 24 30 mov %r15,0x30(%rsp) 11: c7 44 24 48 00 00 00 movl $0x0,0x48(%rsp) 18: 00 19: 48 89 d8 mov %rbx,%rax 1c: 48 c1 e8 03 shr $0x3,%rax 20: 48 89 44 24 38 mov %rax,0x38(%rsp) 25: 42 80 3c 20 00 cmpb $0x0,(%rax,%r12,1) * 2a: 74 08 je 0x34 <-- trapping instruction 2c: 48 89 df mov %rbx,%rdi 2f: e8 60 9f 72 fd call 0xfd729f94 34: 48 8b 03 mov (%rbx),%rax 37: 48 89 44 24 40 mov %rax,0x40(%rsp) 3c: 4c 8d 7b 10 lea 0x10(%rbx),%r15