================================================================== BUG: KASAN: slab-out-of-bounds in __bpf_get_stackid+0x6fa/0x960 kernel/bpf/stackmap.c:274 Write of size 72 at addr ffff88812444f210 by task syz.2.558/2337 CPU: 0 PID: 2337 Comm: syz.2.558 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026 Call Trace: __dump_stack+0x21/0x24 lib/dump_stack.c:88 dump_stack_lvl+0x110/0x170 lib/dump_stack.c:106 print_address_description+0x71/0x200 mm/kasan/report.c:316 print_report+0x4a/0x60 mm/kasan/report.c:420 kasan_report+0x122/0x150 mm/kasan/report.c:524 check_region_inline mm/kasan/generic.c:-1 [inline] kasan_check_range+0x249/0x2a0 mm/kasan/generic.c:189 memcpy+0x44/0x70 mm/kasan/shadow.c:66 __bpf_get_stackid+0x6fa/0x960 kernel/bpf/stackmap.c:274 ____bpf_get_stackid_pe kernel/bpf/stackmap.c:365 [inline] bpf_get_stackid_pe+0x2ee/0x400 kernel/bpf/stackmap.c:334 bpf_prog_02c92f715e75ceb8+0x28/0x3d bpf_dispatcher_nop_func include/linux/bpf.h:987 [inline] __bpf_prog_run include/linux/filter.h:607 [inline] bpf_prog_run include/linux/filter.h:614 [inline] bpf_overflow_handler+0x3d0/0x5e0 kernel/events/core.c:10238 __perf_event_overflow+0x437/0x620 kernel/events/core.c:9448 perf_swevent_overflow kernel/events/core.c:9524 [inline] perf_swevent_event+0x2f7/0x530 kernel/events/core.c:-1 do_perf_sw_event kernel/events/core.c:9665 [inline] ___perf_sw_event+0x3bf/0x4f0 kernel/events/core.c:9696 __perf_sw_event+0x134/0x270 kernel/events/core.c:9708 perf_sw_event include/linux/perf_event.h:1250 [inline] do_user_addr_fault+0xffb/0x1050 arch/x86/mm/fault.c:1285 handle_page_fault arch/x86/mm/fault.c:1464 [inline] exc_page_fault+0x51/0xb0 arch/x86/mm/fault.c:1517 asm_exc_page_fault+0x27/0x30 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:ffffc90000757268 EFLAGS: 00050202 RAX: ffffffff82689a01 RBX: 0000000000000004 RCX: 0000000000000004 RDX: 0000000000000004 RSI: 00001ffee80d4b38 RDI: ffffc90000757380 RBP: ffffc90000757290 R08: 0000000000000003 R09: 0000000000000004 R10: dffffc0000000000 R11: fffff520000eae70 R12: 00007fffffffeffc R13: ffffc900000b9050 R14: ffffc90000757380 R15: 00001ffee80d4b38 copy_from_user include/linux/uaccess.h:161 [inline] copy_from_bpfptr_offset include/linux/bpfptr.h:53 [inline] resolve_pseudo_ldimm64+0x5bc/0x1190 kernel/bpf/verifier.c:13088 bpf_check+0x3e06/0x10d10 kernel/bpf/verifier.c:15555 bpf_prog_load+0x10f0/0x16a0 kernel/bpf/syscall.c:2624 __sys_bpf+0x57b/0x850 kernel/bpf/syscall.c:5005 __do_sys_bpf kernel/bpf/syscall.c:5109 [inline] __se_sys_bpf kernel/bpf/syscall.c:5107 [inline] __x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:5107 x64_sys_call+0x488/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:322 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: 0033:0x7f90f659c819 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:00007f90f7451028 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 RAX: ffffffffffffffda RBX: 00007f90f6815fa0 RCX: 00007f90f659c819 RDX: 0000000000000080 RSI: 0000200000000d00 RDI: 0000000000000005 RBP: 00007f90f6632c91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f90f6816038 R14: 00007f90f6815fa0 R15: 00007fff39b37f58 Allocated by task 2337: kasan_save_stack mm/kasan/common.c:46 [inline] kasan_set_track+0x4b/0x70 mm/kasan/common.c:53 kasan_save_alloc_info+0x25/0x30 mm/kasan/generic.c:505 ____kasan_kmalloc mm/kasan/common.c:380 [inline] __kasan_kmalloc+0x95/0xb0 mm/kasan/common.c:389 kasan_kmalloc include/linux/kasan.h:212 [inline] __do_kmalloc_node mm/slab_common.c:938 [inline] __kmalloc_node+0xb2/0x1e0 mm/slab_common.c:945 kmalloc_node include/linux/slab.h:589 [inline] __bpf_map_area_alloc kernel/bpf/syscall.c:328 [inline] bpf_map_area_alloc+0x4b/0xe0 kernel/bpf/syscall.c:341 prealloc_elems_and_freelist+0x8a/0x1e0 kernel/bpf/stackmap.c:51 stack_map_alloc+0x3a7/0x530 kernel/bpf/stackmap.c:117 find_and_alloc_map kernel/bpf/syscall.c:133 [inline] map_create+0x49c/0xd80 kernel/bpf/syscall.c:1126 __sys_bpf+0x34e/0x850 kernel/bpf/syscall.c:4987 __do_sys_bpf kernel/bpf/syscall.c:5109 [inline] __se_sys_bpf kernel/bpf/syscall.c:5107 [inline] __x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:5107 x64_sys_call+0x488/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:322 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 ffff88812444f200 which belongs to the cache kmalloc-64 of size 64 The buggy address is located 16 bytes inside of 64-byte region [ffff88812444f200, ffff88812444f240) The buggy address belongs to the physical page: page:ffffea00049113c0 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x12444f flags: 0x4000000000000200(slab|zone=1) raw: 4000000000000200 ffffea0004745c80 dead000000000005 ffff888100042780 raw: 0000000000000000 0000000000200020 00000001ffffffff 0000000000000000 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 283, tgid 283 (syz-executor), ts 72977800621, free_ts 72977726891 set_page_owner include/linux/page_owner.h:33 [inline] post_alloc_hook+0x1f5/0x210 mm/page_alloc.c:2670 prep_new_page+0x1c/0x110 mm/page_alloc.c:2677 get_page_from_freelist+0x2d12/0x2d80 mm/page_alloc.c:4583 __alloc_pages+0x1fa/0x610 mm/page_alloc.c:5924 alloc_slab_page+0x6e/0xf0 include/linux/gfp.h:-1 allocate_slab mm/slub.c:1967 [inline] new_slab+0x98/0x3d0 mm/slub.c:2020 ___slab_alloc+0x6bd/0xb20 mm/slub.c:3177 __slab_alloc+0x5e/0xa0 mm/slub.c:3263 slab_alloc_node mm/slub.c:3348 [inline] __kmem_cache_alloc_node+0x203/0x2c0 mm/slub.c:3423 kmalloc_node_trace+0x26/0xb0 mm/slab_common.c:1041 kmalloc_node include/linux/slab.h:585 [inline] kzalloc_node include/linux/slab.h:710 [inline] __get_vm_area_node+0x12c/0x360 mm/vmalloc.c:2515 __vmalloc_node_range+0x326/0x1430 mm/vmalloc.c:3216 __vmalloc_node mm/vmalloc.c:3321 [inline] vzalloc+0x78/0x90 mm/vmalloc.c:3394 xt_counters_alloc+0x44/0x50 net/netfilter/x_tables.c:1379 __do_replace+0xb0/0x960 net/ipv6/netfilter/ip6_tables.c:1065 do_replace net/ipv6/netfilter/ip6_tables.c:1160 [inline] do_ip6t_set_ctl+0xb33/0xe00 net/ipv6/netfilter/ip6_tables.c:1646 page last free stack trace: reset_page_owner include/linux/page_owner.h:26 [inline] free_pages_prepare mm/page_alloc.c:1578 [inline] free_pcp_prepare mm/page_alloc.c:1652 [inline] free_unref_page_prepare+0x742/0x750 mm/page_alloc.c:3618 free_unref_page+0x95/0x540 mm/page_alloc.c:3716 free_the_page mm/page_alloc.c:863 [inline] __free_pages+0x67/0x100 mm/page_alloc.c:6014 __vunmap+0x9c0/0xb80 mm/vmalloc.c:2739 __vfree mm/vmalloc.c:2788 [inline] vfree+0x61/0x90 mm/vmalloc.c:2819 copy_entries_to_user net/ipv6/netfilter/ip6_tables.c:884 [inline] get_entries net/ipv6/netfilter/ip6_tables.c:1041 [inline] do_ip6t_get_ctl+0xeaf/0x1190 net/ipv6/netfilter/ip6_tables.c:1679 nf_getsockopt+0x27f/0x2a0 net/netfilter/nf_sockopt.c:116 ipv6_getsockopt+0x223/0x2d0 net/ipv6/ipv6_sockglue.c:1513 tcp_getsockopt+0xff/0x130 net/ipv4/tcp.c:4462 sock_common_getsockopt+0xaa/0xc0 net/core/sock.c:3680 __sys_getsockopt+0x215/0x4a0 net/socket.c:2321 __do_sys_getsockopt net/socket.c:2336 [inline] __se_sys_getsockopt net/socket.c:2333 [inline] __x64_sys_getsockopt+0xbf/0xd0 net/socket.c:2333 x64_sys_call+0x3d/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:56 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: ffff88812444f100: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ffff88812444f180: 00 00 00 00 00 00 00 03 fc fc fc fc fc fc fc fc >ffff88812444f200: 00 00 00 00 00 fc fc fc fc fc fc fc fc fc fc fc ^ ffff88812444f280: 00 00 00 00 00 00 00 03 fc fc fc fc fc fc fc fc ffff88812444f300: 00 00 00 00 00 00 00 00 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