==================================================================
BUG: KASAN: slab-out-of-bounds in __bpf_get_stackid+0x6bf/0x900 kernel/bpf/stackmap.c:271
Write of size 32 at addr ffff88807e099a90 by task syz.0.830/8301
CPU: 0 PID: 8301 Comm: syz.0.830 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
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+0x6bf/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_f996dc42cdf0283d+0x29/0x41
bpf_dispatcher_nop_func include/linux/bpf.h:1224 [inline]
__bpf_prog_run include/linux/filter.h:616 [inline]
bpf_prog_run include/linux/filter.h:623 [inline]
bpf_overflow_handler+0x1fc/0x510 kernel/events/core.c:10584
__perf_event_overflow+0x447/0x630 kernel/events/core.c:9720
perf_event_overflow kernel/events/core.c:9741 [inline]
perf_swevent_hrtimer+0x439/0x610 kernel/events/core.c:11230
__run_hrtimer kernel/time/hrtimer.c:1754 [inline]
__hrtimer_run_queues+0x4e1/0xc40 kernel/time/hrtimer.c:1818
hrtimer_interrupt+0x3c9/0x9c0 kernel/time/hrtimer.c:1880
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1077 [inline]
__sysvec_apic_timer_interrupt+0xfb/0x3b0 arch/x86/kernel/apic/apic.c:1094
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1088 [inline]
sysvec_apic_timer_interrupt+0x9f/0xc0 arch/x86/kernel/apic/apic.c:1088
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:687
RIP: 0010:__syscall_enter_from_user_work kernel/entry/common.c:97 [inline]
RIP: 0010:syscall_enter_from_user_mode+0x2e/0x80 kernel/entry/common.c:118
Code: 41 56 53 48 89 f3 49 89 fe 48 8b 7c 24 10 e8 e9 fa ff ff 66 90 66 90 e8 80 7c 05 f7 e8 3b 7c 05 f7 fb 65 48 8b 05 92 93 7b 75 <48> 8b 70 08 40 f6 c6 3f 74 0b 4c 89 f7 5b 41 5e e9 bd b7 eb f6 48
RSP: 0018:ffffc90018aeff08 EFLAGS: 00000286
RAX: ffff888024658000 RBX: 00000000000000ca RCX: 5017c0b4d3484000
RDX: dffffc0000000000 RSI: ffffffff8acacbe0 RDI: ffffffff8b1c9a20
RBP: ffffc90018aeff48 R08: ffffffff8e8b502f R09: 1ffffffff1d16a05
R10: dffffc0000000000 R11: fffffbfff1d16a06 R12: 0000000000000000
R13: 0000000000000000 R14: ffffc90018aeff58 R15: 0000000000000000
do_syscall_64+0x28/0xb0 arch/x86/entry/common.c:72
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f2ff6f9ce59
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:00007f2ff7e960e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: ffffffffffffffda RBX: 00007f2ff7215fa8 RCX: 00007f2ff6f9ce59
RDX: 00000000000f4240 RSI: 0000000000000081 RDI: 00007f2ff7215fac
RBP: 00007f2ff7215fa0 R08: 0000000000745d1e R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f2ff7216038 R14: 00007ffd45082ff0 R15: 00007ffd450830d8
Allocated by task 8301:
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+0xb4/0x230 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+0x33a/0x4c0 kernel/bpf/stackmap.c:114
map_create+0x877/0x12f0 kernel/bpf/syscall.c:1247
__sys_bpf+0x651/0x890 kernel/bpf/syscall.c:5459
__do_sys_bpf kernel/bpf/syscall.c:5581 [inline]
__se_sys_bpf kernel/bpf/syscall.c:5579 [inline]
__x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:5579
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 ffff88807e099a80
which belongs to the cache kmalloc-cg-64 of size 64
The buggy address is located 16 bytes inside of
allocated 40-byte region [ffff88807e099a80, ffff88807e099aa8)
The buggy address belongs to the physical page:
page:ffffea0001f82640 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff88807e099580 pfn:0x7e099
memcg:ffff88807de0e201
flags: 0xfff00000000800(slab|node=0|zone=1|lastcpupid=0x7ff)
page_type: 0xffffffff()
raw: 00fff00000000800 ffff888017c4da00 ffffea0001822ac0 0000000000000002
raw: ffff88807e099580 000000008020001d 00000001ffffffff ffff88807de0e201
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 5780, tgid 5780 (syz-executor), ts 126398939513, free_ts 126398379977
set_page_owner include/linux/page_owner.h:31 [inline]
post_alloc_hook+0x1c1/0x200 mm/page_alloc.c:1581
prep_new_page mm/page_alloc.c:1588 [inline]
get_page_from_freelist+0x1951/0x19e0 mm/page_alloc.c:3220
__alloc_pages+0x1f0/0x460 mm/page_alloc.c:4500
alloc_slab_page+0x5d/0x160 mm/slub.c:1881
allocate_slab mm/slub.c:2028 [inline]
new_slab+0x87/0x2d0 mm/slub.c:2081
___slab_alloc+0xc5d/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+0x19e/0x250 mm/slub.c:3534
kmalloc_trace+0x2a/0xe0 mm/slab_common.c:1098
kmalloc include/linux/slab.h:600 [inline]
alloc_fdtable+0xca/0x2c0 fs/file.c:147
dup_fd+0x786/0xa50 fs/file.c:346
copy_files+0xc3/0x120 kernel/fork.c:1796
copy_process+0x15ab/0x3dc0 kernel/fork.c:2496
kernel_clone+0x24b/0x8a0 kernel/fork.c:2917
__do_sys_clone kernel/fork.c:3060 [inline]
__se_sys_clone kernel/fork.c:3044 [inline]
__x64_sys_clone+0x1b7/0x230 kernel/fork.c:3044
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:1181 [inline]
free_unref_page_prepare+0x7b2/0x8c0 mm/page_alloc.c:2365
free_unref_page+0x32/0x2e0 mm/page_alloc.c:2458
vfree+0x1a6/0x320 mm/vmalloc.c:2868
__do_replace+0x858/0x990 net/ipv6/netfilter/ip6_tables.c:1107
do_replace net/ipv6/netfilter/ip6_tables.c:1158 [inline]
do_ip6t_set_ctl+0xb48/0xe10 net/ipv6/netfilter/ip6_tables.c:1644
nf_setsockopt+0x263/0x280 net/netfilter/nf_sockopt.c:101
do_sock_setsockopt+0x175/0x1a0 net/socket.c:2321
__sys_setsockopt net/socket.c:2344 [inline]
__do_sys_setsockopt net/socket.c:2353 [inline]
__se_sys_setsockopt net/socket.c:2350 [inline]
__x64_sys_setsockopt+0x182/0x200 net/socket.c:2350
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
Memory state around the buggy address:
ffff88807e099980: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
ffff88807e099a00: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
>ffff88807e099a80: 00 00 00 00 00 fc fc fc fc fc fc fc fc fc fc fc
^
ffff88807e099b00: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
ffff88807e099b80: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
==================================================================
----------------
Code disassembly (best guess):
0: 41 56 push %r14
2: 53 push %rbx
3: 48 89 f3 mov %rsi,%rbx
6: 49 89 fe mov %rdi,%r14
9: 48 8b 7c 24 10 mov 0x10(%rsp),%rdi
e: e8 e9 fa ff ff call 0xfffffafc
13: 66 90 xchg %ax,%ax
15: 66 90 xchg %ax,%ax
17: e8 80 7c 05 f7 call 0xf7057c9c
1c: e8 3b 7c 05 f7 call 0xf7057c5c
21: fb sti
22: 65 48 8b 05 92 93 7b mov %gs:0x757b9392(%rip),%rax # 0x757b93bc
29: 75
* 2a: 48 8b 70 08 mov 0x8(%rax),%rsi <-- trapping instruction
2e: 40 f6 c6 3f test $0x3f,%sil
32: 74 0b je 0x3f
34: 4c 89 f7 mov %r14,%rdi
37: 5b pop %rbx
38: 41 5e pop %r14
3a: e9 bd b7 eb f6 jmp 0xf6ebb7fc
3f: 48 rex.W