================================================================== BUG: KASAN: slab-out-of-bounds in __bpf_get_stackid+0x6fa/0x960 kernel/bpf/stackmap.c:274 Write of size 56 at addr ffff888133d48c10 by task syz.0.988/3818 CPU: 1 PID: 3818 Comm: syz.0.988 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026 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_414bf0f3713a850d+0x21/0x39 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+0x3c7/0x5e0 kernel/events/core.c:10273 __perf_event_overflow+0x458/0x640 kernel/events/core.c:9448 perf_event_overflow kernel/events/core.c:9469 [inline] perf_swevent_hrtimer+0x4b4/0x540 kernel/events/core.c:10919 __run_hrtimer kernel/time/hrtimer.c:1685 [inline] __hrtimer_run_queues+0x398/0x890 kernel/time/hrtimer.c:1749 hrtimer_interrupt+0x3ad/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:put_ctx+0x1/0x190 kernel/events/core.c:1212 Code: a1 da ff be 02 00 00 00 eb 0a e8 3a a1 da ff be 01 00 00 00 48 89 df e8 0d 06 d2 00 eb d9 66 2e 0f 1f 84 00 00 00 00 00 90 55 <48> 89 e5 41 57 41 56 41 54 53 48 89 fb e8 0d a1 da ff 4c 8d b3 c0 RSP: 0018:ffffc900010cfbd0 EFLAGS: 00000246 RAX: 0fef14f1e25e9e00 RBX: ffff88812aa31c00 RCX: 0000000000000000 RDX: 0000000000000001 RSI: 0000000000000008 RDI: ffff88812aa31c00 RBP: ffffc900010cfe80 R08: ffffc900010cfb67 R09: 1ffff92000219f6c R10: dffffc0000000000 R11: fffff52000219f6d R12: 0000000040042408 R13: dffffc0000000000 R14: fffff52000219f8c R15: 0000000000000000 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: 0033:0x7ff55279e019 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:00007ff553584028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007ff552a25fa0 RCX: 00007ff55279e019 RDX: 0000000000000006 RSI: 0000000040042408 RDI: 0000000000000007 RBP: 00007ff55283500c R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ff552a26038 R14: 00007ff552a25fa0 R15: 00007fffe272af08 Allocated by task 3818: kasan_save_stack mm/kasan/common.c:46 [inline] kasan_set_track+0x4b/0x70 mm/kasan/common.c:53 kasan_save_alloc_info+0x1f/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+0x398/0x520 kernel/bpf/stackmap.c:117 find_and_alloc_map kernel/bpf/syscall.c:133 [inline] map_create+0x467/0xcf0 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 Last potentially related work creation: kasan_save_stack+0x3a/0x60 mm/kasan/common.c:46 __kasan_record_aux_stack+0xb6/0xc0 mm/kasan/generic.c:486 kasan_record_aux_stack_noalloc+0xb/0x10 mm/kasan/generic.c:496 kvfree_call_rcu+0x8b/0x7a0 kernel/rcu/tree.c:3445 ip6addrlbl_net_exit+0x10f/0x180 net/ipv6/addrlabel.c:347 ops_exit_list net/core/net_namespace.c:172 [inline] cleanup_net+0x5b0/0xb10 net/core/net_namespace.c:604 process_one_work+0x717/0xc30 kernel/workqueue.c:2302 worker_thread+0xa4d/0x11d0 kernel/workqueue.c:2449 kthread+0x281/0x320 kernel/kthread.c:386 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 The buggy address belongs to the object at ffff888133d48c00 which belongs to the cache kmalloc-64 of size 64 The buggy address is located 16 bytes inside of 64-byte region [ffff888133d48c00, ffff888133d48c40) The buggy address belongs to the physical page: page:ffffea0004cf5200 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x133d48 flags: 0x4000000000000200(slab|zone=1) raw: 4000000000000200 ffffea0004673040 dead000000000002 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 1648, tgid 1647 (syz.4.395), ts 53095794111, free_ts 52955315462 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+0x2ca9/0x2d20 mm/page_alloc.c:4586 __alloc_pages+0x1fa/0x610 mm/page_alloc.c:5930 alloc_slab_page+0x6e/0xf0 include/linux/gfp.h:-1 allocate_slab mm/slub.c:1967 [inline] new_slab+0x98/0x3e0 mm/slub.c:2020 ___slab_alloc+0x70f/0xb70 mm/slub.c:3177 __slab_alloc+0x5e/0xa0 mm/slub.c:3263 slab_alloc_node mm/slub.c:3348 [inline] __kmem_cache_alloc_node+0x204/0x2d0 mm/slub.c:3423 __do_kmalloc_node mm/slab_common.c:937 [inline] __kmalloc_node_track_caller+0xa1/0x1e0 mm/slab_common.c:958 __do_krealloc mm/slab_common.c:1341 [inline] krealloc+0x6f/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+0x2dcd/0xf140 kernel/bpf/verifier.c:12461 do_check_common+0x11c3/0x1970 kernel/bpf/verifier.c:14940 do_check_main kernel/bpf/verifier.c:15003 [inline] bpf_check+0xa04e/0x10e90 kernel/bpf/verifier.c:15580 bpf_prog_load+0x10f4/0x1670 kernel/bpf/syscall.c:2624 __sys_bpf+0x57b/0x850 kernel/bpf/syscall.c:5006 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+0x80c/0x820 mm/page_alloc.c:3621 free_unref_page+0x93/0x530 mm/page_alloc.c:3719 free_the_page mm/page_alloc.c:863 [inline] __free_pages+0x67/0x100 mm/page_alloc.c:6020 __vunmap+0xa3c/0xc00 mm/vmalloc.c:2739 __vfree mm/vmalloc.c:2788 [inline] vfree+0x61/0x90 mm/vmalloc.c:2819 kvfree+0x26/0x40 mm/util.c:637 bpf_map_area_free+0x15/0x20 kernel/bpf/syscall.c:351 sock_map_free+0x25d/0x2a0 net/core/sock_map.c:364 map_create+0x95c/0xcf0 kernel/bpf/syscall.c:1211 __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 Memory state around the buggy address: ffff888133d48b00: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ffff888133d48b80: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc >ffff888133d48c00: 00 00 00 00 00 fc fc fc fc fc fc fc fc fc fc fc ^ ffff888133d48c80: 00 00 00 00 00 00 fc fc fc fc fc fc fc fc fc fc ffff888133d48d00: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc ================================================================== ---------------- Code disassembly (best guess): 0: a1 da ff be 02 00 00 movabs 0xeb00000002beffda,%eax 7: 00 eb 9: 0a e8 or %al,%ch b: 3a a1 da ff be 01 cmp 0x1beffda(%rcx),%ah 11: 00 00 add %al,(%rax) 13: 00 48 89 add %cl,-0x77(%rax) 16: df e8 fucomip %st(0),%st 18: 0d 06 d2 00 eb or $0xeb00d206,%eax 1d: d9 66 2e fldenv 0x2e(%rsi) 20: 0f 1f 84 00 00 00 00 nopl 0x0(%rax,%rax,1) 27: 00 28: 90 nop 29: 55 push %rbp * 2a: 48 89 e5 mov %rsp,%rbp <-- trapping instruction 2d: 41 57 push %r15 2f: 41 56 push %r14 31: 41 54 push %r12 33: 53 push %rbx 34: 48 89 fb mov %rdi,%rbx 37: e8 0d a1 da ff call 0xffdaa149 3c: 4c rex.WR 3d: 8d .byte 0x8d 3e: b3 c0 mov $0xc0,%bl