================================================================== BUG: KASAN: slab-out-of-bounds in __bpf_get_stackid+0x6bf/0x900 kernel/bpf/stackmap.c:271 Write of size 32 at addr ffff888076547760 by task syz.0.17/5928 CPU: 0 PID: 5928 Comm: syz.0.17 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026 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: 0033:0x7fb39f6655c3 Code: 53 48 83 ec 38 80 3d 5b ca 3a 00 00 89 7c 24 18 48 89 74 24 28 0f 85 cd 09 00 00 80 3d 2a 01 ee 00 00 49 89 f1 41 89 d2 89 cb 05 36 ca 3a 00 01 41 89 d7 0f 85 45 04 00 00 80 3d f6 00 ee 00 RSP: 002b:00007ffd48214800 EFLAGS: 00010246 RAX: 00007fb39fa15fa0 RBX: 0000000000000000 RCX: 0000000000000000 RDX: 0000000000000003 RSI: 00007fb39fa16038 RDI: 0000000000000006 RBP: 00007fb39fa15fb0 R08: 0000000000000000 R09: 00007fb39fa16038 R10: 0000000000000003 R11: 0000000000000000 R12: 00007fb39fa15fa0 R13: 0000200000000000 R14: 00007ffd48214878 R15: 00007fb39fa15fa0 Allocated by task 5928: 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 The buggy address belongs to the object at ffff888076547700 which belongs to the cache kmalloc-cg-128 of size 128 The buggy address is located 96 bytes inside of allocated 120-byte region [ffff888076547700, ffff888076547778) The buggy address belongs to the physical page: page:ffffea0001d951c0 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x76547 memcg:ffff88807bc7a001 flags: 0xfff00000000800(slab|node=0|zone=1|lastcpupid=0x7ff) page_type: 0xffffffff() raw: 00fff00000000800 ffff888017c4dc80 dead000000000122 0000000000000000 raw: 0000000000000000 0000000080100010 00000001ffffffff ffff88807bc7a001 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 5886, tgid 5886 (syz-executor), ts 92819240685, free_ts 92818809861 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 __do_kmalloc_node mm/slab_common.c:1006 [inline] __kmalloc_node+0xa4/0x230 mm/slab_common.c:1014 kmalloc_node include/linux/slab.h:620 [inline] kvmalloc_node+0x70/0x180 mm/util.c:617 kvmalloc include/linux/slab.h:738 [inline] kvzalloc include/linux/slab.h:746 [inline] allocate_hook_entries_size net/netfilter/core.c:61 [inline] nf_hook_entries_grow+0x27d/0x6d0 net/netfilter/core.c:140 __nf_register_net_hook+0x2c9/0x910 net/netfilter/core.c:435 nf_register_net_hook+0xb2/0x190 net/netfilter/core.c:578 nf_register_net_hooks+0x44/0x1b0 net/netfilter/core.c:594 ip6t_register_table+0x543/0x7e0 net/ipv6/netfilter/ip6_tables.c:1787 ip6table_filter_table_init+0x75/0xb0 net/ipv6/netfilter/ip6table_filter.c:48 xt_find_table_lock+0x306/0x3e0 net/netfilter/x_tables.c:1282 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 vfree+0x1a6/0x320 mm/vmalloc.c:2868 copy_entries_to_user net/ipv4/netfilter/ip_tables.c:866 [inline] get_entries net/ipv4/netfilter/ip_tables.c:1022 [inline] do_ipt_get_ctl+0xf15/0x1200 net/ipv4/netfilter/ip_tables.c:1668 nf_getsockopt+0x262/0x280 net/netfilter/nf_sockopt.c:116 ip_getsockopt+0x19f/0x230 net/ipv4/ip_sockglue.c:1790 do_sock_getsockopt+0x379/0x450 net/socket.c:2383 __sys_getsockopt net/socket.c:2412 [inline] __do_sys_getsockopt net/socket.c:2422 [inline] __se_sys_getsockopt net/socket.c:2419 [inline] __x64_sys_getsockopt+0x1d6/0x280 net/socket.c:2419 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: ffff888076547600: 00 00 00 00 00 00 00 00 00 00 00 00 00 fc fc fc ffff888076547680: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff888076547700: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 fc ^ ffff888076547780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888076547800: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc 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