================================================================== BUG: KASAN: slab-out-of-bounds in __bpf_get_stackid+0x6c9/0x920 kernel/bpf/stackmap.c:274 Write of size 80 at addr ffff888054d4de10 by task syz.3.5707/28556 CPU: 0 PID: 28556 Comm: syz.3.5707 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/07/2026 Call Trace: dump_stack_lvl+0x188/0x24e lib/dump_stack.c:106 print_address_description mm/kasan/report.c:316 [inline] print_report+0xa8/0x210 mm/kasan/report.c:420 kasan_report+0x10b/0x140 mm/kasan/report.c:524 check_region_inline mm/kasan/generic.c:-1 [inline] kasan_check_range+0x235/0x290 mm/kasan/generic.c:189 memcpy+0x3c/0x60 mm/kasan/shadow.c:66 __bpf_get_stackid+0x6c9/0x920 kernel/bpf/stackmap.c:274 ____bpf_get_stackid_pe kernel/bpf/stackmap.c:365 [inline] bpf_get_stackid_pe+0x33f/0x400 kernel/bpf/stackmap.c:334 bpf_prog_ee9fdca00c0e1e15+0x28/0x3d bpf_dispatcher_nop_func include/linux/bpf.h:1013 [inline] __bpf_prog_run include/linux/filter.h:608 [inline] bpf_prog_run include/linux/filter.h:615 [inline] bpf_overflow_handler+0x50b/0x790 kernel/events/core.c:10331 __perf_event_overflow+0x457/0x630 kernel/events/core.c:9506 perf_swevent_overflow kernel/events/core.c:9589 [inline] perf_swevent_event+0x315/0x570 kernel/events/core.c:9640 do_perf_sw_event kernel/events/core.c:9753 [inline] ___perf_sw_event+0x498/0x6d0 kernel/events/core.c:9784 __perf_sw_event+0x135/0x260 kernel/events/core.c:9796 perf_sw_event include/linux/perf_event.h:1254 [inline] do_user_addr_fault+0x497/0xb20 arch/x86/mm/fault.c:1284 handle_page_fault arch/x86/mm/fault.c:1429 [inline] exc_page_fault+0x60/0x100 arch/x86/mm/fault.c:1482 asm_exc_page_fault+0x22/0x30 arch/x86/include/asm/idtentry.h:608 RIP: 0010:copy_user_short_string+0x22/0x40 arch/x86/lib/copy_user_64.S:242 Code: e7 90 90 90 90 90 90 90 89 d1 83 e2 07 c1 e9 03 74 12 4c 8b 06 4c 89 07 48 8d 76 08 48 8d 7f 08 ff c9 75 ee 21 d2 74 10 89 d1 <8a> 06 88 07 48 ff c6 48 ff c7 ff c9 75 f2 31 c0 0f 01 ca c3 8d 14 RSP: 0018:ffffc90003887ac8 EFLAGS: 00050202 RAX: ffffffff8416c501 RBX: 0000000000000004 RCX: 0000000000000004 RDX: 0000000000000004 RSI: 0000000000000000 RDI: ffffc90003887c10 RBP: 0000000000000000 R08: 0000000000000003 R09: 0000000000000004 R10: dffffc0000000000 R11: fffff52000710f82 R12: 00007fffffffeffc R13: dffffc0000000000 R14: ffffc90003887c10 R15: 0000000000000000 copy_user_generic arch/x86/include/asm/uaccess_64.h:37 [inline] raw_copy_from_user arch/x86/include/asm/uaccess_64.h:52 [inline] _copy_from_user+0xf4/0x170 lib/usercopy.c:23 copy_from_user include/linux/uaccess.h:161 [inline] dev_ethtool+0xc2/0x12f0 net/ethtool/ioctl.c:3077 dev_ioctl+0x474/0xe80 net/core/dev_ioctl.c:510 sock_do_ioctl+0x245/0x320 net/socket.c:1216 sock_ioctl+0x48a/0x700 net/socket.c:1321 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:870 [inline] __se_sys_ioctl+0xfa/0x170 fs/ioctl.c:856 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: 0033:0x7f257b99f559 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:00007f257c89f028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f257bc25fa0 RCX: 00007f257b99f559 RDX: 00002000000001c0 RSI: 0000000000008946 RDI: 000000000000000a RBP: 00007f257ba36b20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f257bc26038 R14: 00007f257bc25fa0 R15: 00007ffd8a4ed7b8 Allocated by task 28556: kasan_save_stack mm/kasan/common.c:46 [inline] kasan_set_track+0x4b/0x70 mm/kasan/common.c:53 ____kasan_kmalloc mm/kasan/common.c:375 [inline] __kasan_kmalloc+0x8e/0xa0 mm/kasan/common.c:384 kasan_kmalloc include/linux/kasan.h:211 [inline] __do_kmalloc_node mm/slab_common.c:936 [inline] __kmalloc_node+0xb2/0x240 mm/slab_common.c:943 kmalloc_node include/linux/slab.h:589 [inline] __bpf_map_area_alloc kernel/bpf/syscall.c:328 [inline] bpf_map_area_alloc+0x47/0xe0 kernel/bpf/syscall.c:341 prealloc_elems_and_freelist+0x86/0x1c0 kernel/bpf/stackmap.c:51 stack_map_alloc+0x386/0x510 kernel/bpf/stackmap.c:117 find_and_alloc_map kernel/bpf/syscall.c:133 [inline] map_create+0x524/0xff0 kernel/bpf/syscall.c:1149 __sys_bpf+0x38b/0x780 kernel/bpf/syscall.c:5017 __do_sys_bpf kernel/bpf/syscall.c:5139 [inline] __se_sys_bpf kernel/bpf/syscall.c:5137 [inline] __x64_sys_bpf+0x78/0x90 kernel/bpf/syscall.c:5137 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 ffff888054d4de00 which belongs to the cache kmalloc-cg-64 of size 64 The buggy address is located 16 bytes inside of 64-byte region [ffff888054d4de00, ffff888054d4de40) The buggy address belongs to the physical page: page:ffffea0001535340 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x54d4d memcg:ffff8880795aae01 flags: 0xfff00000000200(slab|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000000200 ffffea0001653380 dead000000000002 ffff888018442780 raw: 0000000000000000 0000000080200020 00000001ffffffff ffff8880795aae01 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 18378, tgid 18378 (syz-executor), ts 948807487223, free_ts 948807074649 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0x173/0x1a0 mm/page_alloc.c:2560 prep_new_page mm/page_alloc.c:2567 [inline] get_page_from_freelist+0x206b/0x2180 mm/page_alloc.c:4358 __alloc_pages+0x1ec/0x4f0 mm/page_alloc.c:5658 alloc_slab_page+0x5d/0x180 mm/slub.c:1799 allocate_slab mm/slub.c:1944 [inline] new_slab+0x87/0x2d0 mm/slub.c:1997 ___slab_alloc+0xbc5/0x1240 mm/slub.c:3154 __slab_alloc mm/slub.c:3240 [inline] slab_alloc_node mm/slub.c:3325 [inline] __kmem_cache_alloc_node+0x126/0x270 mm/slub.c:3398 kmalloc_trace+0x26/0xe0 mm/slab_common.c:1026 kmalloc include/linux/slab.h:563 [inline] alloc_fdtable+0xca/0x2c0 fs/file.c:147 dup_fd+0x743/0xa20 fs/file.c:346 copy_files+0x72/0xe0 kernel/fork.c:1647 copy_process+0x180e/0x4070 kernel/fork.c:2346 kernel_clone+0x24b/0x900 kernel/fork.c:2765 __do_sys_clone kernel/fork.c:2906 [inline] __se_sys_clone kernel/fork.c:2890 [inline] __x64_sys_clone+0x1a7/0x220 kernel/fork.c:2890 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 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1487 [inline] free_pcp_prepare mm/page_alloc.c:1537 [inline] free_unref_page_prepare+0x8e5/0x9e0 mm/page_alloc.c:3414 free_unref_page+0x2e/0x3f0 mm/page_alloc.c:3509 __vunmap+0x874/0xa40 mm/vmalloc.c:2783 __do_replace+0x86d/0x980 net/ipv6/netfilter/ip6_tables.c:1112 do_replace net/ipv6/netfilter/ip6_tables.c:1163 [inline] do_ip6t_set_ctl+0xb3d/0xe10 net/ipv6/netfilter/ip6_tables.c:1648 nf_setsockopt+0x25f/0x280 net/netfilter/nf_sockopt.c:101 __sys_setsockopt+0x2bf/0x3d0 net/socket.c:2288 __do_sys_setsockopt net/socket.c:2299 [inline] __se_sys_setsockopt net/socket.c:2296 [inline] __x64_sys_setsockopt+0xb1/0xc0 net/socket.c:2296 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: ffff888054d4dd00: 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc fc ffff888054d4dd80: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc >ffff888054d4de00: 00 00 00 00 00 fc fc fc fc fc fc fc fc fc fc fc ^ ffff888054d4de80: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ffff888054d4df00: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ================================================================== ---------------- Code disassembly (best guess): 0: e7 90 out %eax,$0x90 2: 90 nop 3: 90 nop 4: 90 nop 5: 90 nop 6: 90 nop 7: 90 nop 8: 89 d1 mov %edx,%ecx a: 83 e2 07 and $0x7,%edx d: c1 e9 03 shr $0x3,%ecx 10: 74 12 je 0x24 12: 4c 8b 06 mov (%rsi),%r8 15: 4c 89 07 mov %r8,(%rdi) 18: 48 8d 76 08 lea 0x8(%rsi),%rsi 1c: 48 8d 7f 08 lea 0x8(%rdi),%rdi 20: ff c9 dec %ecx 22: 75 ee jne 0x12 24: 21 d2 and %edx,%edx 26: 74 10 je 0x38 28: 89 d1 mov %edx,%ecx * 2a: 8a 06 mov (%rsi),%al <-- trapping instruction 2c: 88 07 mov %al,(%rdi) 2e: 48 ff c6 inc %rsi 31: 48 ff c7 inc %rdi 34: ff c9 dec %ecx 36: 75 f2 jne 0x2a 38: 31 c0 xor %eax,%eax 3a: 0f 01 ca clac 3d: c3 ret 3e: 8d .byte 0x8d 3f: 14 .byte 0x14