================================================================== BUG: KASAN: slab-out-of-bounds in stack_map_get_build_id_offset+0x6c0/0x720 kernel/bpf/stackmap.c:144 Write of size 4 at addr ffff88807a8ff330 by task syz.2.2027/14341 CPU: 0 PID: 14341 Comm: syz.2.2027 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026 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 stack_map_get_build_id_offset+0x6c0/0x720 kernel/bpf/stackmap.c:144 __bpf_get_stackid+0x564/0x900 kernel/bpf/stackmap.c:247 ____bpf_get_stackid_pe kernel/bpf/stackmap.c:362 [inline] bpf_get_stackid_pe+0x343/0x410 kernel/bpf/stackmap.c:331 bpf_prog_2414a5d5030ea31b+0x29/0x2d bpf_dispatcher_nop_func include/linux/bpf.h:1224 [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 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+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: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: 0010:rep_movs_alternative+0x4a/0x90 arch/x86/lib/copy_user_64.S:71 Code: 75 f1 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 48 8b 06 48 89 07 48 83 c6 08 48 83 c7 08 83 e9 08 74 df 83 f9 08 73 e8 eb c9 a4 c3 48 8b 06 48 89 07 48 8d 47 08 48 83 e0 f8 48 29 f8 48 01 RSP: 0018:ffffc900038f72f0 EFLAGS: 00050206 RAX: ffffffff84342c01 RBX: 0000000000000062 RCX: 0000000000000040 RDX: 0000000000000000 RSI: ffff888039ec06ae RDI: 000020000000d000 RBP: ffff888039ec0668 R08: ffff888039ec06ed R09: 1ffff110073d80dd R10: dffffc0000000000 R11: ffffed10073d80de R12: 000020000000d040 R13: 0000000000000062 R14: 000020000000cfde R15: ffff888039ec068c copy_user_generic arch/x86/include/asm/uaccess_64.h:112 [inline] raw_copy_to_user arch/x86/include/asm/uaccess_64.h:133 [inline] _copy_to_user+0x85/0xa0 lib/usercopy.c:41 copy_to_user include/linux/uaccess.h:191 [inline] bpf_verifier_vlog+0x432/0x840 kernel/bpf/log.c:87 verbose+0x11e/0x1a0 kernel/bpf/verifier.c:370 print_verification_stats kernel/bpf/verifier.c:19990 [inline] bpf_check+0x599d/0xec40 kernel/bpf/verifier.c:20693 bpf_prog_load+0x10fa/0x1610 kernel/bpf/syscall.c:2753 __sys_bpf+0x5ba/0x890 kernel/bpf/syscall.c:5491 __do_sys_bpf kernel/bpf/syscall.c:5595 [inline] __se_sys_bpf kernel/bpf/syscall.c:5593 [inline] __x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:5593 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 RIP: 0033:0x7f399019e159 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:00007f3990f9a028 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 RAX: ffffffffffffffda RBX: 00007f3990425fa0 RCX: 00007f399019e159 RDX: 0000000000000048 RSI: 000020000000e000 RDI: 0000000000000005 RBP: 00007f399023506b R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f3990426038 R14: 00007f3990425fa0 R15: 00007ffc90567718 Allocated by task 14341: 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:5473 __do_sys_bpf kernel/bpf/syscall.c:5595 [inline] __se_sys_bpf kernel/bpf/syscall.c:5593 [inline] __x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:5593 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 insert_work+0x3d/0x310 kernel/workqueue.c:1674 __queue_work+0xbfd/0xfd0 kernel/workqueue.c:1823 queue_work_on+0x128/0x1f0 kernel/workqueue.c:1858 bpf_map_put_with_uref kernel/bpf/syscall.c:772 [inline] bpf_map_release+0x119/0x130 kernel/bpf/syscall.c:782 __fput+0x221/0x940 fs/file_table.c:418 task_work_run+0x1d4/0x260 kernel/task_work.c:245 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline] exit_to_user_mode_loop+0xe6/0x110 kernel/entry/common.c:180 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 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 insert_work+0x3d/0x310 kernel/workqueue.c:1674 __queue_work+0xbfd/0xfd0 kernel/workqueue.c:1823 queue_work_on+0x128/0x1f0 kernel/workqueue.c:1858 __bpf_free_used_maps kernel/bpf/core.c:2797 [inline] bpf_free_used_maps kernel/bpf/core.c:2803 [inline] bpf_prog_free_deferred+0x19c/0x650 kernel/bpf/core.c:2842 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 The buggy address belongs to the object at ffff88807a8ff000 which belongs to the cache kmalloc-cg-1k of size 1024 The buggy address is located 0 bytes to the right of allocated 816-byte region [ffff88807a8ff000, ffff88807a8ff330) The buggy address belongs to the physical page: page:ffffea0001ea3e00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x7a8f8 head:ffffea0001ea3e00 order:3 entire_mapcount:0 nr_pages_mapped:0 pincount:0 memcg:ffff888019778d01 flags: 0xfff00000000840(slab|head|node=0|zone=1|lastcpupid=0x7ff) page_type: 0xffffffff() raw: 00fff00000000840 ffff888017c4f280 dead000000000100 dead000000000122 raw: 0000000000000000 0000000080100010 00000001ffffffff ffff888019778d01 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 3, migratetype Unmovable, gfp_mask 0x1d20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL), pid 5778, tgid 5778 (syz-executor), ts 78150297641, free_ts 78140052372 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_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_node+0xa6/0x240 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] xt_alloc_table_info+0x3b/0xa0 net/netfilter/x_tables.c:1215 do_replace net/ipv6/netfilter/ip6_tables.c:1141 [inline] do_ip6t_set_ctl+0x90c/0xe10 net/ipv6/netfilter/ip6_tables.c:1641 nf_setsockopt+0x263/0x280 net/netfilter/nf_sockopt.c:101 do_sock_setsockopt+0x175/0x1a0 net/socket.c:2322 __sys_setsockopt net/socket.c:2345 [inline] __do_sys_setsockopt net/socket.c:2354 [inline] __se_sys_setsockopt net/socket.c:2351 [inline] __x64_sys_setsockopt+0x182/0x200 net/socket.c:2351 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 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 napi_frag_unref include/linux/skbuff.h:3539 [inline] skb_release_data+0x3ca/0x7f0 net/core/skbuff.c:982 skb_release_all net/core/skbuff.c:1054 [inline] __kfree_skb+0x57/0x70 net/core/skbuff.c:1068 tcp_clean_rtx_queue net/ipv4/tcp_input.c:3444 [inline] tcp_ack+0x221a/0x6630 net/ipv4/tcp_input.c:4034 tcp_rcv_established+0xf56/0x1d70 net/ipv4/tcp_input.c:6120 tcp_v4_do_rcv+0x6d3/0xba0 net/ipv4/tcp_ipv4.c:1744 tcp_v4_rcv+0x2358/0x2a60 net/ipv4/tcp_ipv4.c:2176 ip_protocol_deliver_rcu+0x20a/0x3f0 net/ipv4/ip_input.c:205 ip_local_deliver_finish+0x2c3/0x510 net/ipv4/ip_input.c:233 NF_HOOK+0x32d/0x3b0 include/linux/netfilter.h:304 dst_input include/net/dst.h:480 [inline] ip_sublist_rcv_finish net/ipv4/ip_input.c:580 [inline] ip_list_rcv_finish net/ipv4/ip_input.c:631 [inline] ip_sublist_rcv+0xa36/0xd60 net/ipv4/ip_input.c:639 ip_list_rcv+0x3ed/0x440 net/ipv4/ip_input.c:674 __netif_receive_skb_list_ptype net/core/dev.c:5713 [inline] __netif_receive_skb_list_core+0x582/0x770 net/core/dev.c:5761 __netif_receive_skb_list net/core/dev.c:5813 [inline] netif_receive_skb_list_internal+0x943/0xca0 net/core/dev.c:5904 gro_normal_list include/net/gro.h:452 [inline] napi_complete_done+0x329/0x820 net/core/dev.c:6244 Memory state around the buggy address: ffff88807a8ff200: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff88807a8ff280: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff88807a8ff300: 00 00 00 00 00 00 fc fc fc fc fc fc fc fc fc fc ^ ffff88807a8ff380: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88807a8ff400: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ================================================================== ---------------- Code disassembly (best guess): 0: 75 f1 jne 0xfffffff3 2: c3 ret 3: 66 2e 0f 1f 84 00 00 cs nopw 0x0(%rax,%rax,1) a: 00 00 00 d: 0f 1f 00 nopl (%rax) 10: 48 8b 06 mov (%rsi),%rax 13: 48 89 07 mov %rax,(%rdi) 16: 48 83 c6 08 add $0x8,%rsi 1a: 48 83 c7 08 add $0x8,%rdi 1e: 83 e9 08 sub $0x8,%ecx 21: 74 df je 0x2 23: 83 f9 08 cmp $0x8,%ecx 26: 73 e8 jae 0x10 28: eb c9 jmp 0xfffffff3 * 2a: f3 a4 rep movsb %ds:(%rsi),%es:(%rdi) <-- trapping instruction 2c: c3 ret 2d: 48 8b 06 mov (%rsi),%rax 30: 48 89 07 mov %rax,(%rdi) 33: 48 8d 47 08 lea 0x8(%rdi),%rax 37: 48 83 e0 f8 and $0xfffffffffffffff8,%rax 3b: 48 29 f8 sub %rdi,%rax 3e: 48 rex.W 3f: 01 .byte 0x1