================================================================== BUG: KASAN: slab-out-of-bounds in __bpf_get_stackid+0x6c7/0x900 kernel/bpf/stackmap.c:271 Write of size 72 at addr ffff8880315e5c10 by task syz.1.1823/11206 CPU: 1 PID: 11206 Comm: syz.1.1823 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2026 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:362 [inline] bpf_get_stackid_pe+0x343/0x410 kernel/bpf/stackmap.c:331 bpf_prog_17c1eeeef5c88f07+0x30/0x51 bpf_dispatcher_nop_func include/linux/bpf.h:1226 [inline] __bpf_prog_run include/linux/filter.h:617 [inline] bpf_prog_run include/linux/filter.h:624 [inline] bpf_overflow_handler+0x1fc/0x510 kernel/events/core.c:10584 __perf_event_overflow+0x461/0x660 kernel/events/core.c:9720 perf_swevent_overflow+0x274/0x340 kernel/events/core.c:9803 perf_swevent_event+0x45c/0x570 kernel/events/core.c:-1 do_perf_sw_event kernel/events/core.c:9967 [inline] ___perf_sw_event+0x4ab/0x730 kernel/events/core.c:9998 __perf_sw_event+0x139/0x270 kernel/events/core.c:10010 perf_sw_event include/linux/perf_event.h:1447 [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: 0010:rep_stos_alternative+0x40/0x80 arch/x86/lib/clear_page_64.S:96 Code: ff c7 48 ff c9 75 f6 c3 48 89 07 48 83 c7 08 83 e9 08 74 f3 83 f9 08 73 ef eb e2 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 <48> 89 07 48 89 47 08 48 89 47 10 48 89 47 18 48 89 47 20 48 89 47 RSP: 0018:ffffc900046df8f8 EFLAGS: 00050246 RAX: 0000000000000000 RBX: ffff88805ee80000 RCX: 0000000000000040 RDX: 0000000000000000 RSI: ffffffff8acade60 RDI: 00007f923e0f1e40 RBP: ffffc900046dfad0 R08: ffffffff8e8c626f R09: 1ffffffff1d18c4d R10: dffffc0000000000 R11: fffffbfff1d18c4e R12: 00007f923e0f1f84 R13: 00007f923e0f1c40 R14: dffffc0000000000 R15: 00007f923e0f1e40 __clear_user arch/x86/include/asm/uaccess_64.h:174 [inline] copy_fpstate_to_sigframe+0x15d/0xce0 arch/x86/kernel/fpu/signal.c:216 get_sigframe+0x5de/0x7d0 arch/x86/kernel/signal.c:142 x64_setup_rt_frame+0x164/0xc30 arch/x86/kernel/signal_64.c:175 setup_rt_frame arch/x86/kernel/signal.c:223 [inline] handle_signal arch/x86/kernel/signal.c:267 [inline] arch_do_signal_or_restart+0x411/0x7b0 arch/x86/kernel/signal.c:312 exit_to_user_mode_loop+0x70/0x110 kernel/entry/common.c:177 exit_to_user_mode_prepare+0xee/0x180 kernel/entry/common.c:213 __syscall_exit_to_user_mode_work kernel/entry/common.c:294 [inline] syscall_exit_to_user_mode+0x1a/0x50 kernel/entry/common.c:305 do_syscall_64+0x61/0xb0 arch/x86/entry/common.c:82 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7f923d19e199 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:00007f923e0f2028 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: 0000000000000001 RBX: 00007f923d425fa0 RCX: 00007f923d19e199 RDX: 0000000000000080 RSI: 0000200000002500 RDI: 000000000000000b RBP: 00007f923d2358e0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f923d426038 R14: 00007f923d425fa0 R15: 00007ffec8b9a768 Allocated by task 11206: 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:5476 __do_sys_bpf kernel/bpf/syscall.c:5598 [inline] __se_sys_bpf kernel/bpf/syscall.c:5596 [inline] __x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:5596 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 nf_ct_netns_do_get+0x3c0/0x5c0 net/netfilter/nf_conntrack_proto.c:463 nf_ct_netns_inet_get+0x1f/0x150 net/netfilter/nf_conntrack_proto.c:572 nf_conncount_init+0x127/0x380 net/netfilter/nf_conncount.c:639 ovs_ct_limit_init net/openvswitch/conntrack.c:1595 [inline] ovs_ct_init+0x264/0x430 net/openvswitch/conntrack.c:2021 ovs_init_net+0x1e6/0x250 net/openvswitch/datapath.c:2702 ops_init+0x391/0x640 net/core/net_namespace.c:139 setup_net+0x3b6/0xa20 net/core/net_namespace.c:343 copy_net_ns+0x361/0x530 net/core/net_namespace.c:524 create_new_namespaces+0x3ce/0x700 kernel/nsproxy.c:110 copy_namespaces+0x42a/0x4a0 kernel/nsproxy.c:179 copy_process+0x16f6/0x3da0 kernel/fork.c:2513 kernel_clone+0x24b/0x8a0 kernel/fork.c:2919 __do_sys_clone kernel/fork.c:3062 [inline] __se_sys_clone kernel/fork.c:3046 [inline] __x64_sys_clone+0x1b7/0x230 kernel/fork.c:3046 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 Second to 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 nf_ct_netns_do_get+0x3c0/0x5c0 net/netfilter/nf_conntrack_proto.c:463 nf_ct_netns_inet_get+0x1f/0x150 net/netfilter/nf_conntrack_proto.c:572 nf_conncount_init+0x127/0x380 net/netfilter/nf_conncount.c:639 ovs_ct_limit_init net/openvswitch/conntrack.c:1595 [inline] ovs_ct_init+0x264/0x430 net/openvswitch/conntrack.c:2021 ovs_init_net+0x1e6/0x250 net/openvswitch/datapath.c:2702 ops_init+0x391/0x640 net/core/net_namespace.c:139 setup_net+0x3b6/0xa20 net/core/net_namespace.c:343 copy_net_ns+0x361/0x530 net/core/net_namespace.c:524 create_new_namespaces+0x3ce/0x700 kernel/nsproxy.c:110 unshare_nsproxy_namespaces+0x11a/0x160 kernel/nsproxy.c:228 ksys_unshare+0x4fa/0x8f0 kernel/fork.c:3444 __do_sys_unshare kernel/fork.c:3518 [inline] __se_sys_unshare kernel/fork.c:3516 [inline] __x64_sys_unshare+0x38/0x40 kernel/fork.c:3516 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 ffff8880315e5c00 which belongs to the cache kmalloc-cg-64 of size 64 The buggy address is located 16 bytes inside of allocated 40-byte region [ffff8880315e5c00, ffff8880315e5c28) The buggy address belongs to the physical page: page:ffffea0000c57940 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x315e5 memcg:ffff88802425d801 flags: 0xfff00000000800(slab|node=0|zone=1|lastcpupid=0x7ff) page_type: 0xffffffff() raw: 00fff00000000800 ffff888017c4da00 ffffea000166e3c0 0000000000000004 raw: 0000000000000000 0000000080200020 00000001ffffffff ffff88802425d801 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 26348998240, free_ts 26340927977 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_pages_node include/linux/gfp.h:237 [inline] alloc_slab_page+0x4f/0x180 mm/slub.c:1883 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_node+0xa6/0x240 mm/slab_common.c:1014 kmalloc_node include/linux/slab.h:620 [inline] __alloc kernel/bpf/memalloc.c:151 [inline] alloc_bulk+0x447/0x6b0 kernel/bpf/memalloc.c:245 prefill_mem_cache kernel/bpf/memalloc.c:486 [inline] bpf_mem_alloc_init+0x6c0/0x870 kernel/bpf/memalloc.c:554 bpf_global_ma_init+0x1a/0x40 kernel/bpf/core.c:3050 do_one_initcall+0x242/0x790 init/main.c:1210 do_initcall_level+0x13d/0x1f0 init/main.c:1272 do_initcalls+0x69/0xd0 init/main.c:1288 kernel_init_freeable+0x3d9/0x560 init/main.c:1525 kernel_init+0x1d/0x1c0 init/main.c:1415 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1182 [inline] free_unref_page_prepare+0x7d7/0x8f0 mm/page_alloc.c:2366 free_unref_page+0x32/0x2e0 mm/page_alloc.c:2459 vfree+0x1a7/0x340 mm/vmalloc.c:2899 delayed_vfree_work+0x55/0x80 mm/vmalloc.c:2819 process_one_work kernel/workqueue.c:2657 [inline] process_scheduled_works+0xa60/0x1600 kernel/workqueue.c:2734 worker_thread+0xa5e/0xfe0 kernel/workqueue.c:2815 kthread+0x2fa/0x390 kernel/kthread.c:388 ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293 Memory state around the buggy address: ffff8880315e5b00: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ffff8880315e5b80: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc >ffff8880315e5c00: 00 00 00 00 00 fc fc fc fc fc fc fc fc fc fc fc ^ ffff8880315e5c80: 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc fc ffff8880315e5d00: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ================================================================== ---------------- Code disassembly (best guess): 0: ff c7 inc %edi 2: 48 ff c9 dec %rcx 5: 75 f6 jne 0xfffffffd 7: c3 ret 8: 48 89 07 mov %rax,(%rdi) b: 48 83 c7 08 add $0x8,%rdi f: 83 e9 08 sub $0x8,%ecx 12: 74 f3 je 0x7 14: 83 f9 08 cmp $0x8,%ecx 17: 73 ef jae 0x8 19: eb e2 jmp 0xfffffffd 1b: 66 2e 0f 1f 84 00 00 cs nopw 0x0(%rax,%rax,1) 22: 00 00 00 25: 0f 1f 44 00 00 nopl 0x0(%rax,%rax,1) * 2a: 48 89 07 mov %rax,(%rdi) <-- trapping instruction 2d: 48 89 47 08 mov %rax,0x8(%rdi) 31: 48 89 47 10 mov %rax,0x10(%rdi) 35: 48 89 47 18 mov %rax,0x18(%rdi) 39: 48 89 47 20 mov %rax,0x20(%rdi) 3d: 48 rex.W 3e: 89 .byte 0x89 3f: 47 rex.RXB