==================================================================
BUG: KASAN: slab-out-of-bounds in __bpf_get_stackid+0x6fa/0x960 kernel/bpf/stackmap.c:274
Write of size 56 at addr ffff888135b39690 by task syz.4.321/1454
CPU: 1 PID: 1454 Comm: syz.4.321 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
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_9f7ee0cc743aa62b+0x21/0x36
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:10273
__perf_event_overflow+0x437/0x620 kernel/events/core.c:9448
perf_event_overflow kernel/events/core.c:9469 [inline]
perf_swevent_hrtimer+0x400/0x5b0 kernel/events/core.c:10919
__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:put_ctx+0x1/0x1a0 kernel/events/core.c:1212
Code: a1 da ff be 02 00 00 00 eb 0a e8 ba a1 da ff be 01 00 00 00 48 89 df e8 3d 4c d2 00 eb d9 66 2e 0f 1f 84 00 00 00 00 00 90 55 <48> 89 e5 41 57 41 56 41 54 53 48 89 fb e8 8d a1 da ff 4c 8d b3 c0
RSP: 0018:ffffc9000dfffbd0 EFLAGS: 00000246
RAX: 3800608f87317300 RBX: ffff88813267f800 RCX: 0000000000000000
RDX: 0000000000000001 RSI: 0000000000000008 RDI: ffff88813267f800
RBP: ffffc9000dfffe80 R08: ffffc9000dfffb67 R09: 1ffff92001bfff6c
R10: dffffc0000000000 R11: fffff52001bfff6d R12: 0000000040042408
R13: dffffc0000000000 R14: fffff52001bfff8c R15: 0000000000000000
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: 0033:0x7f800699cdd9
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:00007f80078e5028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f8006c15fa0 RCX: 00007f800699cdd9
RDX: 0000000000000006 RSI: 0000000040042408 RDI: 0000000000000007
RBP: 00007f8006a32d69 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f8006c16038 R14: 00007f8006c15fa0 R15: 00007ffd82da4008
Allocated by task 1459:
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: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 ffff888135b39680
which belongs to the cache kmalloc-64 of size 64
The buggy address is located 16 bytes inside of
64-byte region [ffff888135b39680, ffff888135b396c0)
The buggy address belongs to the physical page:
page:ffffea0004d6ce40 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x135b39
flags: 0x4000000000000200(slab|zone=1)
raw: 4000000000000200 0000000000000000 dead000000000001 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 420, tgid 415 (syz.1.30), ts 37654742461, free_ts 0
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+0x2d12/0x2d80 mm/page_alloc.c:4585
__alloc_pages+0x1fa/0x610 mm/page_alloc.c:5926
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_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+0x136/0xb70 net/ipv6/addrlabel.c:253
ip6addrlbl_net_init+0x277/0x410 net/ipv6/addrlabel.c:320
ops_init+0x1c8/0x4a0 net/core/net_namespace.c:138
setup_net+0x4b4/0xcc0 net/core/net_namespace.c:335
copy_net_ns+0x355/0x5c0 net/core/net_namespace.c:481
create_new_namespaces+0x3a2/0x660 kernel/nsproxy.c:110
page_owner free stack trace missing
Memory state around the buggy address:
ffff888135b39580: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc
ffff888135b39600: 00 00 00 00 00 00 00 03 fc fc fc fc fc fc fc fc
>ffff888135b39680: 00 00 00 00 00 fc fc fc fc fc fc fc fc fc fc fc
^
ffff888135b39700: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
ffff888135b39780: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
==================================================================
----------------
Code disassembly (best guess):
0: a1 da ff be 02 00 00 movabs 0xeb00000002beffda,%eax
7: 00 eb
9: 0a e8 or %al,%ch
b: ba a1 da ff be mov $0xbeffdaa1,%edx
10: 01 00 add %eax,(%rax)
12: 00 00 add %al,(%rax)
14: 48 89 df mov %rbx,%rdi
17: e8 3d 4c d2 00 call 0xd24c59
1c: eb d9 jmp 0xfffffff7
1e: 66 2e 0f 1f 84 00 00 cs nopw 0x0(%rax,%rax,1)
25: 00 00 00
28: 90 nop
29: 55 push %rbp
* 2a: 48 89 e5 mov %rsp,%rbp <-- trapping instruction
2d: 41 57 push %r15
2f: 41 56 push %r14
31: 41 54 push %r12
33: 53 push %rbx
34: 48 89 fb mov %rdi,%rbx
37: e8 8d a1 da ff call 0xffdaa1c9
3c: 4c rex.WR
3d: 8d .byte 0x8d
3e: b3 c0 mov $0xc0,%bl