================================================================== BUG: KASAN: slab-out-of-bounds in __bpf_get_stackid+0x6c7/0x900 kernel/bpf/stackmap.c:271 Write of size 32 at addr ffff88801ee63b38 by task syz.1.3583/16963 CPU: 1 PID: 16963 Comm: syz.1.3583 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+0x6c7/0x900 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_7c99200ca08d4ddc+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:10576 __perf_event_overflow+0x461/0x660 kernel/events/core.c:9712 perf_swevent_overflow+0x274/0x340 kernel/events/core.c:9795 perf_swevent_event+0x45c/0x570 kernel/events/core.c:-1 do_perf_sw_event kernel/events/core.c:9959 [inline] ___perf_sw_event+0x4ab/0x730 kernel/events/core.c:9990 __perf_sw_event+0x139/0x270 kernel/events/core.c:10002 perf_sw_event include/linux/perf_event.h:1442 [inline] do_user_addr_fault+0x1242/0x12d0 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: 0033:0x7ffc0b719a21 Code: 48 89 c2 eb a7 4c 29 d2 48 0f ba e2 3e 0f 82 ad 00 00 00 48 bf ff ff ff ff ff ff ff 7f 48 21 fa 49 0f af d1 48 01 c2 48 d3 ea <48> 89 55 c0 31 c0 48 81 fa 00 ca 9a 3b 72 1c 31 c9 48 81 c2 00 36 RSP: 002b:00007f3a9257eff0 EFLAGS: 00010203 RAX: 001cf52545cdbf6c RBX: 00007ffc0b7150b0 RCX: 0000000000000018 RDX: 000000001d4ade79 RSI: 00007f3a9257f0b0 RDI: 7fffffffffffffff RBP: 00007f3a9257f030 R08: 0000000000000417 R09: 0000000000745d1e R10: 0000021cb7cec78a R11: 0000000000032326 R12: 0000000000000010 R13: 00007f3a91a16038 R14: 00007ffc0b715080 R15: 0000000000032326 Allocated by task 16963: 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+0xb6/0x240 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+0x32b/0x4b0 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 Last potentially related work creation: kasan_save_stack+0x3e/0x60 mm/kasan/common.c:46 __kasan_record_aux_stack+0xaf/0xc0 mm/kasan/generic.c:492 __call_rcu_common kernel/rcu/tree.c:2721 [inline] call_rcu+0x153/0x900 kernel/rcu/tree.c:2837 nf_hook_entries_free net/netfilter/core.c:88 [inline] __nf_register_net_hook+0x787/0x910 net/netfilter/core.c:457 nf_register_net_hook+0xb2/0x190 net/netfilter/core.c:578 nf_register_net_hooks+0x44/0x1b0 net/netfilter/core.c:594 ebt_register_table+0xd12/0x10e0 net/bridge/netfilter/ebtables.c:1274 find_inlist_lock_noload+0x16a/0x250 net/bridge/netfilter/ebtables.c:343 find_inlist_lock net/bridge/netfilter/ebtables.c:371 [inline] find_table_lock net/bridge/netfilter/ebtables.c:379 [inline] do_ebt_get_ctl+0x2d6/0x1d30 net/bridge/netfilter/ebtables.c:2498 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:2384 __sys_getsockopt net/socket.c:2413 [inline] __do_sys_getsockopt net/socket.c:2423 [inline] __se_sys_getsockopt net/socket.c:2420 [inline] __x64_sys_getsockopt+0x1d6/0x280 net/socket.c:2420 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 ffff88801ee63b00 which belongs to the cache kmalloc-cg-96 of size 96 The buggy address is located 56 bytes inside of allocated 80-byte region [ffff88801ee63b00, ffff88801ee63b50) The buggy address belongs to the physical page: page:ffffea00007b98c0 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1ee63 memcg:ffff88802cd57a01 anon flags: 0xfff00000000800(slab|node=0|zone=1|lastcpupid=0x7ff) page_type: 0xffffffff() raw: 00fff00000000800 ffff888017c4db40 0000000000000000 dead000000000001 raw: 0000000000000000 0000000080200020 00000001ffffffff ffff88802cd57a01 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 0, migratetype Unmovable, gfp_mask 0x12cc0(GFP_KERNEL|__GFP_NOWARN|__GFP_NORETRY), pid 1, tgid 1 (swapper/0), ts 2822108769, free_ts 0 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0x1c1/0x200 mm/page_alloc.c:1582 prep_new_page mm/page_alloc.c:1589 [inline] get_page_from_freelist+0x2181/0x22a0 mm/page_alloc.c:3221 __alloc_pages+0x1f0/0x460 mm/page_alloc.c:4501 alloc_page_interleave+0x24/0x1e0 mm/mempolicy.c:2118 alloc_slab_page+0x5d/0x180 mm/slub.c:1881 allocate_slab mm/slub.c:2028 [inline] new_slab+0x87/0x2d0 mm/slub.c:2081 ___slab_alloc+0xc5c/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+0x11f/0x250 mm/slub.c:3534 __do_kmalloc_node mm/slab_common.c:1006 [inline] __kmalloc+0xa7/0x240 mm/slab_common.c:1020 kmalloc include/linux/slab.h:604 [inline] kzalloc include/linux/slab.h:721 [inline] __register_sysctl_table+0x71/0x1210 fs/proc/proc_sysctl.c:1373 net_sysctl_init+0x20/0x80 net/sysctl_net.c:103 sock_init+0x10/0xf0 net/socket.c:3279 do_one_initcall+0x242/0x790 init/main.c:1249 do_initcall_level+0x13d/0x1f0 init/main.c:1311 do_initcalls+0x69/0xd0 init/main.c:1327 kernel_init_freeable+0x3d9/0x560 init/main.c:1564 page_owner free stack trace missing Memory state around the buggy address: ffff88801ee63a00: fa fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc ffff88801ee63a80: fa fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc >ffff88801ee63b00: 00 00 00 00 00 00 00 00 00 00 fc fc fc fc fc fc ^ ffff88801ee63b80: fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc ffff88801ee63c00: fa fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc ==================================================================