==================================================================
BUG: KASAN: slab-out-of-bounds in __bpf_get_stackid+0x6fa/0x960 kernel/bpf/stackmap.c:274
Write of size 56 at addr ffff888133669610 by task syz.1.377/1618
CPU: 1 PID: 1618 Comm: syz.1.377 Tainted: G W syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
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_bfd8beedeee773b1+0x21/0x39
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_hrtimer+0x400/0x5b0 kernel/events/core.c:10879
__run_hrtimer kernel/time/hrtimer.c:1685 [inline]
__hrtimer_run_queues+0x3bb/0x8e0 kernel/time/hrtimer.c:1749
hrtimer_interrupt+0x3c7/0x8c0 kernel/time/hrtimer.c:1811
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1107 [inline]
__sysvec_apic_timer_interrupt+0x11e/0x440 arch/x86/kernel/apic/apic.c:1124
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1118 [inline]
sysvec_apic_timer_interrupt+0xa4/0xc0 arch/x86/kernel/apic/apic.c:1118
asm_sysvec_apic_timer_interrupt+0x1b/0x20 arch/x86/include/asm/idtentry.h:691
RIP: 0010:__sanitizer_cov_trace_pc+0x1/0x60 kernel/kcov.c:209
Code: fb e8 23 00 00 00 48 8b 3d ac 4b 21 06 48 89 de e8 f4 98 44 00 5b 5d c3 00 90 90 90 90 90 90 90 90 90 90 90 b8 0c 67 40 a5 55 <48> 89 e5 48 8b 45 08 65 48 8b 0d e0 fe 90 7e 65 8b 15 e1 fe 90 7e
RSP: 0018:ffffc9000ef27bd0 EFLAGS: 00000246
RAX: ffffffff8199f9ad RBX: 0000000000000000 RCX: 0000000000000002
RDX: ffff8881150f5100 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc9000ef27e80 R08: ffff888115e61cbf R09: 1ffff11022bcc397
R10: dffffc0000000000 R11: ffffed1022bcc398 R12: 0000000040042408
R13: dffffc0000000000 R14: fffff52001de4f8c R15: ffffc9000efcb000
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:870 [inline]
__se_sys_ioctl+0x12f/0x1b0 fs/ioctl.c:856
__x64_sys_ioctl+0x7b/0x90 fs/ioctl.c:856
x64_sys_call+0x58b/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:17
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: 0033:0x7f711199c819
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:00007f71128c4028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f7111c16090 RCX: 00007f711199c819
RDX: 0000000000000006 RSI: 0000000040042408 RDI: 0000000000000007
RBP: 00007f7111a32c91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f7111c16128 R14: 00007f7111c16090 R15: 00007ffdb6396e38
Allocated by task 1618:
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 ffff888133669600
which belongs to the cache kmalloc-64 of size 64
The buggy address is located 16 bytes inside of
64-byte region [ffff888133669600, ffff888133669640)
The buggy address belongs to the physical page:
page:ffffea0004cd9a40 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x133669
flags: 0x4000000000000200(slab|zone=1)
raw: 4000000000000200 ffffea0004ca6480 dead000000000008 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 285, tgid 285 (syz-executor), ts 30030827829, free_ts 30030720474
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:
ffff888133669500: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
ffff888133669580: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
>ffff888133669600: 00 00 00 00 00 fc fc fc fc fc fc fc fc fc fc fc
^
ffff888133669680: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc
ffff888133669700: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
==================================================================
----------------
Code disassembly (best guess):
0: fb sti
1: e8 23 00 00 00 call 0x29
6: 48 8b 3d ac 4b 21 06 mov 0x6214bac(%rip),%rdi # 0x6214bb9
d: 48 89 de mov %rbx,%rsi
10: e8 f4 98 44 00 call 0x449909
15: 5b pop %rbx
16: 5d pop %rbp
17: c3 ret
18: 00 90 90 90 90 90 add %dl,-0x6f6f6f70(%rax)
1e: 90 nop
1f: 90 nop
20: 90 nop
21: 90 nop
22: 90 nop
23: 90 nop
24: b8 0c 67 40 a5 mov $0xa540670c,%eax
29: 55 push %rbp
* 2a: 48 89 e5 mov %rsp,%rbp <-- trapping instruction
2d: 48 8b 45 08 mov 0x8(%rbp),%rax
31: 65 48 8b 0d e0 fe 90 mov %gs:0x7e90fee0(%rip),%rcx # 0x7e90ff19
38: 7e
39: 65 8b 15 e1 fe 90 7e mov %gs:0x7e90fee1(%rip),%edx # 0x7e90ff21