================================================================== BUG: KASAN: slab-out-of-bounds in __bpf_get_stackid+0x6fa/0x960 kernel/bpf/stackmap.c:274 Write of size 88 at addr ffff888134492d90 by task syz.2.1163/4972 CPU: 1 PID: 4972 Comm: syz.2.1163 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_e6b925630670470c+0x21/0x34 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: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:plist_check_list+0x0/0x270 lib/plist.c:45 Code: 38 c1 0f 8c e2 fd ff ff 49 89 d7 48 89 d7 e8 97 45 c5 fc 4c 89 fa e9 cf fd ff ff e8 0a ba 7f fc 0f 0b e8 03 ba 7f fc 0f 0b 90 <55> 48 89 e5 41 57 41 56 41 55 41 54 53 48 83 ec 28 48 89 fb 49 be RSP: 0018:ffffc900038ffaa0 EFLAGS: 00000292 RAX: ffffffff84f1b695 RBX: ffff88810034b708 RCX: 0000000000080000 RDX: ffffc90003ed1000 RSI: 000000000000004b RDI: ffff88810034b708 RBP: ffffc900038ffae8 R08: ffff88811714d12b R09: 1ffff11022e29a25 R10: dffffc0000000000 R11: ffffed1022e29a26 R12: dffffc0000000000 R13: dffffc0000000000 R14: ffffc900038cfbf0 R15: ffffc900038cfbf8 __futex_unqueue+0x76/0xb0 kernel/futex/core.c:519 futex_wake_mark+0xe7/0x150 kernel/futex/waitwake.c:124 futex_wake+0x3e5/0x8e0 kernel/futex/waitwake.c:181 do_futex+0x2bf/0x430 kernel/futex/syscalls.c:141 __do_sys_futex kernel/futex/syscalls.c:213 [inline] __se_sys_futex+0x136/0x310 kernel/futex/syscalls.c:194 __x64_sys_futex+0xe5/0x100 kernel/futex/syscalls.c:194 x64_sys_call+0x7ec/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:203 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: 0033:0x7fc89699e199 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:00007fc8977810e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: ffffffffffffffda RBX: 00007fc896c25fa8 RCX: 00007fc89699e199 RDX: 00000000000f4240 RSI: 0000000000000081 RDI: 00007fc896c25fac RBP: 00007fc896c25fa0 R08: 0024efe98df6d5f4 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fc896c26038 R14: 00007fff42ab0ed0 R15: 00007fff42ab0fb8 Allocated by task 4972: 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 ffff888134492d80 which belongs to the cache kmalloc-64 of size 64 The buggy address is located 16 bytes inside of 64-byte region [ffff888134492d80, ffff888134492dc0) The buggy address belongs to the physical page: page:ffffea0004d12480 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x134492 flags: 0x4000000000000200(slab|zone=1) raw: 4000000000000200 ffffea00043b8d00 dead000000000003 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 304, tgid 304 (syz-executor), ts 90832909528, free_ts 90832784031 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_trace+0x29/0xb0 mm/slab_common.c:1028 kmalloc include/linux/slab.h:563 [inline] alloc_fdtable+0xcd/0x2e0 fs/file.c:147 dup_fd+0x693/0x8c0 fs/file.c:347 copy_files+0x76/0xe0 kernel/fork.c:1770 copy_process+0x1223/0x3500 kernel/fork.c:2475 kernel_clone+0x22f/0x7f0 kernel/fork.c:2903 __do_sys_clone kernel/fork.c:3046 [inline] __se_sys_clone kernel/fork.c:3030 [inline] __x64_sys_clone+0x193/0x200 kernel/fork.c:3030 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: ffff888134492c80: 00 00 00 00 00 00 fc fc fc fc fc fc fc fc fc fc ffff888134492d00: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc >ffff888134492d80: 00 00 00 00 00 fc fc fc fc fc fc fc fc fc fc fc ^ ffff888134492e00: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ffff888134492e80: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ================================================================== ---------------- Code disassembly (best guess): 0: 38 c1 cmp %al,%cl 2: 0f 8c e2 fd ff ff jl 0xfffffdea 8: 49 89 d7 mov %rdx,%r15 b: 48 89 d7 mov %rdx,%rdi e: e8 97 45 c5 fc call 0xfcc545aa 13: 4c 89 fa mov %r15,%rdx 16: e9 cf fd ff ff jmp 0xfffffdea 1b: e8 0a ba 7f fc call 0xfc7fba2a 20: 0f 0b ud2 22: e8 03 ba 7f fc call 0xfc7fba2a 27: 0f 0b ud2 29: 90 nop * 2a: 55 push %rbp <-- trapping instruction 2b: 48 89 e5 mov %rsp,%rbp 2e: 41 57 push %r15 30: 41 56 push %r14 32: 41 55 push %r13 34: 41 54 push %r12 36: 53 push %rbx 37: 48 83 ec 28 sub $0x28,%rsp 3b: 48 89 fb mov %rdi,%rbx 3e: 49 rex.WB 3f: be .byte 0xbe