================================================================== BUG: KASAN: slab-out-of-bounds in __bpf_get_stackid+0x6fa/0x960 kernel/bpf/stackmap.c:274 Write of size 72 at addr ffff8881163ab410 by task syz.3.74/607 CPU: 0 PID: 607 Comm: syz.3.74 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2026 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_8c8c81eee0578f0a+0x21/0x39 bpf_dispatcher_nop_func include/linux/bpf.h:987 [inline] __bpf_prog_run include/linux/filter.h:596 [inline] bpf_prog_run include/linux/filter.h:614 [inline] bpf_overflow_handler+0x521/0x5e0 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:1689 [inline] __hrtimer_run_queues+0x398/0x8a0 kernel/time/hrtimer.c:1753 hrtimer_interrupt+0x3ad/0x8c0 kernel/time/hrtimer.c:1815 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:check_region_inline mm/kasan/generic.c:-1 [inline] RIP: 0010:kasan_check_range+0x15/0x2a0 mm/kasan/generic.c:189 Code: cc cc 00 00 cc 90 90 90 90 90 90 90 90 90 90 90 b8 bf f3 05 3b b0 01 48 85 f6 0f 84 c0 01 00 00 55 48 89 e5 41 57 41 56 41 55 <41> 54 53 49 89 f8 49 01 f0 0f 82 1d 02 00 00 49 89 f8 49 c1 e8 2f RSP: 0018:ffffc90010b97b08 EFLAGS: 00000202 RAX: f3f3f3f8f1f1f101 RBX: ffff888119fd3cc0 RCX: ffffffff85004562 RDX: 0000000000000001 RSI: 0000000000000008 RDI: ffff888113e48810 RBP: ffffc90010b97b20 R08: ffff88811893b83f R09: 1ffff11023127707 R10: dffffc0000000000 R11: ffffed1023127708 R12: dffffc0000000000 R13: 1ffff92002172f68 R14: ffff888113e48810 R15: ffffc90010b97b60 __kasan_check_write+0x14/0x20 mm/kasan/shadow.c:37 instrument_atomic_read_write include/linux/instrumented.h:102 [inline] atomic_long_try_cmpxchg_release include/linux/atomic/atomic-instrumented.h:1788 [inline] __mutex_unlock_fast kernel/locking/mutex.c:188 [inline] mutex_unlock+0x82/0x230 kernel/locking/mutex.c:560 perf_event_ctx_unlock kernel/events/core.c:1321 [inline] perf_ioctl+0x14a4/0x1e70 kernel/events/core.c:5838 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: 0033:0x7f40a539e159 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:00007f40a6195028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f40a5625fa0 RCX: 00007f40a539e159 RDX: 0000000000000008 RSI: 0000000040042408 RDI: 0000000000000009 RBP: 00007f40a543506b R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f40a5626038 R14: 00007f40a5625fa0 R15: 00007fff5d7b48b8 Allocated by task 607: 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 The buggy address belongs to the object at ffff8881163ab400 which belongs to the cache kmalloc-64 of size 64 The buggy address is located 16 bytes inside of 64-byte region [ffff8881163ab400, ffff8881163ab440) The buggy address belongs to the physical page: page:ffffea000458eac0 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1163ab flags: 0x4000000000000200(slab|zone=1) raw: 4000000000000200 0000000000000000 dead000000000122 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 288, tgid 288 (syz-executor), ts 33936633796, free_ts 33936610988 set_page_owner include/linux/page_owner.h:33 [inline] post_alloc_hook+0x1f5/0x210 mm/page_alloc.c:2673 prep_new_page+0x1c/0x110 mm/page_alloc.c:2680 get_page_from_freelist+0x2ca9/0x2d20 mm/page_alloc.c:4587 __alloc_pages+0x1fa/0x610 mm/page_alloc.c:5931 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 kmalloc_node_trace+0x26/0xb0 mm/slab_common.c:1041 kmalloc_node include/linux/slab.h:585 [inline] kzalloc_node include/linux/slab.h:710 [inline] __get_vm_area_node+0x12c/0x360 mm/vmalloc.c:2515 __vmalloc_node_range+0x326/0x1440 mm/vmalloc.c:3216 __vmalloc_node mm/vmalloc.c:3321 [inline] vzalloc+0x78/0x90 mm/vmalloc.c:3394 alloc_counters+0x66/0x530 net/ipv4/netfilter/arp_tables.c:672 copy_entries_to_user net/ipv6/netfilter/ip6_tables.c:839 [inline] get_entries net/ipv6/netfilter/ip6_tables.c:1039 [inline] do_ip6t_get_ctl+0xa84/0x11b0 net/ipv6/netfilter/ip6_tables.c:1676 nf_getsockopt+0x27f/0x2a0 net/netfilter/nf_sockopt.c:116 page last free stack trace: reset_page_owner include/linux/page_owner.h:26 [inline] free_pages_prepare mm/page_alloc.c:1581 [inline] free_pcp_prepare mm/page_alloc.c:1655 [inline] free_unref_page_prepare+0x81b/0x820 mm/page_alloc.c:3622 free_unref_page+0x93/0x530 mm/page_alloc.c:3720 free_the_page mm/page_alloc.c:863 [inline] __free_pages+0x67/0x100 mm/page_alloc.c:6021 __vunmap+0xa3c/0xc00 mm/vmalloc.c:2739 __vfree mm/vmalloc.c:2788 [inline] vfree+0x61/0x90 mm/vmalloc.c:2819 copy_entries_to_user net/ipv6/netfilter/ip6_tables.c:882 [inline] get_entries net/ipv6/netfilter/ip6_tables.c:1039 [inline] do_ip6t_get_ctl+0xe91/0x11b0 net/ipv6/netfilter/ip6_tables.c:1676 nf_getsockopt+0x27f/0x2a0 net/netfilter/nf_sockopt.c:116 ipv6_getsockopt+0x230/0x2d0 net/ipv6/ipv6_sockglue.c:1513 tcp_getsockopt+0xff/0x130 net/ipv4/tcp.c:4464 sock_common_getsockopt+0xaa/0xc0 net/core/sock.c:3689 __sys_getsockopt+0x215/0x490 net/socket.c:2322 __do_sys_getsockopt net/socket.c:2337 [inline] __se_sys_getsockopt net/socket.c:2334 [inline] __x64_sys_getsockopt+0xbf/0xd0 net/socket.c:2334 x64_sys_call+0x3d/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:56 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: ffff8881163ab300: 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc fc ffff8881163ab380: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc >ffff8881163ab400: 00 00 00 00 00 fc fc fc fc fc fc fc fc fc fc fc ^ ffff8881163ab480: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc ffff8881163ab500: 00 00 00 00 00 00 fc fc fc fc fc fc fc fc fc fc ================================================================== ---------------- Code disassembly (best guess): 0: cc int3 1: cc int3 2: 00 00 add %al,(%rax) 4: cc int3 5: 90 nop 6: 90 nop 7: 90 nop 8: 90 nop 9: 90 nop a: 90 nop b: 90 nop c: 90 nop d: 90 nop e: 90 nop f: 90 nop 10: b8 bf f3 05 3b mov $0x3b05f3bf,%eax 15: b0 01 mov $0x1,%al 17: 48 85 f6 test %rsi,%rsi 1a: 0f 84 c0 01 00 00 je 0x1e0 20: 55 push %rbp 21: 48 89 e5 mov %rsp,%rbp 24: 41 57 push %r15 26: 41 56 push %r14 28: 41 55 push %r13 * 2a: 41 54 push %r12 <-- trapping instruction 2c: 53 push %rbx 2d: 49 89 f8 mov %rdi,%r8 30: 49 01 f0 add %rsi,%r8 33: 0f 82 1d 02 00 00 jb 0x256 39: 49 89 f8 mov %rdi,%r8 3c: 49 c1 e8 2f shr $0x2f,%r8