==================================================================
BUG: KASAN: slab-out-of-bounds in __bpf_get_stackid+0x6fa/0x960 kernel/bpf/stackmap.c:274
Write of size 24 at addr ffff88810d409128 by task syz.4.1136/4337
CPU: 1 PID: 4337 Comm: syz.4.1136 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
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:377 [inline]
bpf_get_stackid_pe+0x350/0x400 kernel/bpf/stackmap.c:334
bpf_prog_669b7aeb98bae856+0x2b/0x45
bpf_dispatcher_nop_func include/linux/bpf.h:987 [inline]
__bpf_prog_run include/linux/filter.h:596 [inline]
bpf_prog_run include/linux/filter.h:614 [inline]
bpf_overflow_handler+0x521/0x5e0 kernel/events/core.c:10273
__perf_event_overflow+0x458/0x640 kernel/events/core.c:9448
perf_event_overflow kernel/events/core.c:9469 [inline]
perf_swevent_hrtimer+0x4b4/0x540 kernel/events/core.c:10919
__run_hrtimer kernel/time/hrtimer.c:1685 [inline]
__hrtimer_run_queues+0x398/0x890 kernel/time/hrtimer.c:1749
hrtimer_interrupt+0x3ad/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:do_futex+0xf1/0x430 kernel/futex/syscalls.c:131
Code: 0a 00 0f 1f 44 00 00 e8 ad 2c 0a 00 4c 89 ff 48 c7 c6 e0 e8 1c 87 e8 ee 31 0a 00 41 83 fd 0d 0f 87 3b 01 00 00 4c 8d 64 24 60 <42> ff 24 fd 00 3c 6b 85 e8 82 2c 0a 00 c7 44 24 60 ff ff ff ff e9
RSP: 0018:ffffc90006587ce0 EFLAGS: 00000293
RAX: 000000000000000d RBX: 0000000000000000 RCX: 0000000000000005
RDX: ffffffff816739a2 RSI: ffffffff871ce8e0 RDI: 0000000000000001
RBP: ffffc90006587da8 R08: ffff888109c0d100 R09: 000000000000000d
R10: 000000000000000d R11: 0000000000000002 R12: ffffc90006587d40
R13: 0000000000000001 R14: 1ffff92000cb0fa4 R15: 0000000000000001
__do_sys_futex kernel/futex/syscalls.c:213 [inline]
__se_sys_futex+0x136/0x310 kernel/futex/syscalls.c:194
__x64_sys_futex+0xe5/0x100 kernel/futex/syscalls.c:194
x64_sys_call+0x7ec/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:203
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: 0033:0x7f5fc9b9e0d9
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:00007f5fcaaa10e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: ffffffffffffffda RBX: 00007f5fc9e25fa8 RCX: 00007f5fc9b9e0d9
RDX: 00000000000f4240 RSI: 0000000000000081 RDI: 00007f5fc9e25fac
RBP: 00007f5fc9e25fa0 R08: 001de59f0f059f96 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f5fc9e26038 R14: 00007ffd8083fc90 R15: 00007ffd8083fd78
Allocated by task 4337:
kasan_save_stack mm/kasan/common.c:46 [inline]
kasan_set_track+0x4b/0x70 mm/kasan/common.c:53
kasan_save_alloc_info+0x1f/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+0x398/0x520 kernel/bpf/stackmap.c:117
find_and_alloc_map kernel/bpf/syscall.c:133 [inline]
map_create+0x467/0xcf0 kernel/bpf/syscall.c:1126
__sys_bpf+0x34e/0x850 kernel/bpf/syscall.c:4988
__do_sys_bpf kernel/bpf/syscall.c:5110 [inline]
__se_sys_bpf kernel/bpf/syscall.c:5108 [inline]
__x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:5108
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 ffff88810d409100
which belongs to the cache kmalloc-64 of size 64
The buggy address is located 40 bytes inside of
64-byte region [ffff88810d409100, ffff88810d409140)
The buggy address belongs to the physical page:
page:ffffea0004350240 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x10d409
flags: 0x4000000000000200(slab|zone=1)
raw: 4000000000000200 ffffea0004b62780 dead000000000004 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 3598, tgid 3597 (syz.0.931), ts 99763909876, free_ts 98966322466
set_page_owner include/linux/page_owner.h:33 [inline]
post_alloc_hook+0x1f5/0x210 mm/page_alloc.c:2672
prep_new_page+0x1c/0x110 mm/page_alloc.c:2679
get_page_from_freelist+0x2ca9/0x2d20 mm/page_alloc.c:4586
__alloc_pages+0x1fa/0x610 mm/page_alloc.c:5930
alloc_slab_page+0x6e/0xf0 include/linux/gfp.h:-1
allocate_slab mm/slub.c:1967 [inline]
new_slab+0x98/0x3e0 mm/slub.c:2020
___slab_alloc+0x70f/0xb70 mm/slub.c:3177
__slab_alloc+0x5e/0xa0 mm/slub.c:3263
slab_alloc_node mm/slub.c:3348 [inline]
__kmem_cache_alloc_node+0x204/0x2d0 mm/slub.c:3423
kmalloc_trace+0x29/0xb0 mm/slab_common.c:1028
kmalloc include/linux/slab.h:563 [inline]
ip6addrlbl_alloc net/ipv6/addrlabel.c:189 [inline]
ip6addrlbl_add+0x136/0xb80 net/ipv6/addrlabel.c:253
ip6addrlbl_net_init+0x254/0x410 net/ipv6/addrlabel.c:320
ops_init+0x2ce/0x470 net/core/net_namespace.c:138
setup_net+0x4b4/0xcd0 net/core/net_namespace.c:335
copy_net_ns+0x355/0x5c0 net/core/net_namespace.c:481
create_new_namespaces+0x3a8/0x660 kernel/nsproxy.c:110
page last free stack trace:
reset_page_owner include/linux/page_owner.h:26 [inline]
free_pages_prepare mm/page_alloc.c:1580 [inline]
free_pcp_prepare mm/page_alloc.c:1654 [inline]
free_unref_page_prepare+0x80c/0x820 mm/page_alloc.c:3621
free_unref_page+0x93/0x530 mm/page_alloc.c:3719
free_the_page mm/page_alloc.c:863 [inline]
__free_pages+0x67/0x100 mm/page_alloc.c:6020
__vunmap+0xa3c/0xc00 mm/vmalloc.c:2739
__vfree mm/vmalloc.c:2788 [inline]
vfree+0x61/0x90 mm/vmalloc.c:2819
kcov_put kernel/kcov.c:437 [inline]
kcov_close+0x2b/0x50 kernel/kcov.c:533
__fput+0x1fd/0x8f0 fs/file_table.c:320
____fput+0x15/0x20 fs/file_table.c:348
task_work_run+0x1e1/0x250 kernel/task_work.c:203
exit_task_work include/linux/task_work.h:39 [inline]
do_exit+0xaf2/0x2850 kernel/exit.c:887
do_group_exit+0x21b/0x2e0 kernel/exit.c:1030
__do_sys_exit_group kernel/exit.c:1041 [inline]
__se_sys_exit_group kernel/exit.c:1039 [inline]
__x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1039
x64_sys_call+0x7b4/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:232
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:
ffff88810d409000: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
ffff88810d409080: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
>ffff88810d409100: 00 00 00 00 00 00 fc fc fc fc fc fc fc fc fc fc
^
ffff88810d409180: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
ffff88810d409200: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
==================================================================
----------------
Code disassembly (best guess):
0: 0a 00 or (%rax),%al
2: 0f 1f 44 00 00 nopl 0x0(%rax,%rax,1)
7: e8 ad 2c 0a 00 call 0xa2cb9
c: 4c 89 ff mov %r15,%rdi
f: 48 c7 c6 e0 e8 1c 87 mov $0xffffffff871ce8e0,%rsi
16: e8 ee 31 0a 00 call 0xa3209
1b: 41 83 fd 0d cmp $0xd,%r13d
1f: 0f 87 3b 01 00 00 ja 0x160
25: 4c 8d 64 24 60 lea 0x60(%rsp),%r12
* 2a: 42 ff 24 fd 00 3c 6b jmp *-0x7a94c400(,%r15,8) <-- trapping instruction
31: 85
32: e8 82 2c 0a 00 call 0xa2cb9
37: c7 44 24 60 ff ff ff movl $0xffffffff,0x60(%rsp)
3e: ff
3f: e9 .byte 0xe9