==================================================================
BUG: KASAN: slab-out-of-bounds in __bpf_get_stackid+0x6fa/0x960 kernel/bpf/stackmap.c:274
Write of size 56 at addr ffff888113d7a590 by task syz.0.144/795
CPU: 0 PID: 795 Comm: syz.0.144 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:365 [inline]
bpf_get_stackid_pe+0x2ee/0x400 kernel/bpf/stackmap.c:334
bpf_prog_dfbb4bc45feb3e40+0x21/0x34
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+0x3c7/0x5e0 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:put_ctx+0x1/0x190 kernel/events/core.c:1212
Code: a1 da ff be 02 00 00 00 eb 0a e8 3a a1 da ff be 01 00 00 00 48 89 df e8 0d 06 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 0d a1 da ff 4c 8d b3 c0
RSP: 0018:ffffc9000f717bd0 EFLAGS: 00000246
RAX: c0c05ef3ff62c600 RBX: ffff88811b822400 RCX: 0000000000000000
RDX: 0000000000000001 RSI: 0000000000000008 RDI: ffff88811b822400
RBP: ffffc9000f717e80 R08: ffffc9000f717b67 R09: 1ffff92001ee2f6c
R10: dffffc0000000000 R11: fffff52001ee2f6d R12: 0000000040042408
R13: dffffc0000000000 R14: fffff52001ee2f8c 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: 0033:0x7f51f0b9e019
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:00007f51f1a1b028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f51f0e25fa0 RCX: 00007f51f0b9e019
RDX: 0000000000000006 RSI: 0000000040042408 RDI: 0000000000000007
RBP: 00007f51f0c3500c R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f51f0e26038 R14: 00007f51f0e25fa0 R15: 00007ffef3a5ed58
Allocated by task 795:
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 ffff888113d7a580
which belongs to the cache kmalloc-64 of size 64
The buggy address is located 16 bytes inside of
64-byte region [ffff888113d7a580, ffff888113d7a5c0)
The buggy address belongs to the physical page:
page:ffffea00044f5e80 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x113d7a
flags: 0x4000000000000200(slab|zone=1)
raw: 4000000000000200 ffffea000440f3c0 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 287, tgid 287 (syz-executor), ts 31025709554, free_ts 31025579790
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]
alloc_fdtable+0xcd/0x2e0 fs/file.c:147
dup_fd+0x693/0x8c0 fs/file.c:347
copy_files+0x76/0xe0 kernel/fork.c:1768
copy_process+0x1223/0x3500 kernel/fork.c:2473
kernel_clone+0x22f/0x7f0 kernel/fork.c:2900
__do_sys_clone kernel/fork.c:3043 [inline]
__se_sys_clone kernel/fork.c:3027 [inline]
__x64_sys_clone+0x193/0x200 kernel/fork.c:3027
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
__do_replace+0x848/0x960 net/ipv6/netfilter/ip6_tables.c:1109
do_replace net/ipv6/netfilter/ip6_tables.c:1160 [inline]
do_ip6t_set_ctl+0xb2c/0xe00 net/ipv6/netfilter/ip6_tables.c:1646
nf_setsockopt+0x284/0x2b0 net/netfilter/nf_sockopt.c:101
ipv6_setsockopt+0x170/0x1a0 net/ipv6/ipv6_sockglue.c:1030
tcp_setsockopt+0xeb/0x100 net/ipv4/tcp.c:3860
sock_common_setsockopt+0xb1/0xc0 net/core/sock.c:3707
__sys_setsockopt+0x2ff/0x4e0 net/socket.c:2277
__do_sys_setsockopt net/socket.c:2288 [inline]
__se_sys_setsockopt net/socket.c:2285 [inline]
__x64_sys_setsockopt+0xbf/0xd0 net/socket.c:2285
x64_sys_call+0x124/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:55
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:
ffff888113d7a480: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
ffff888113d7a500: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
>ffff888113d7a580: 00 00 00 00 00 fc fc fc fc fc fc fc fc fc fc fc
^
ffff888113d7a600: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
ffff888113d7a680: 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: 3a a1 da ff be 01 cmp 0x1beffda(%rcx),%ah
11: 00 00 add %al,(%rax)
13: 00 48 89 add %cl,-0x77(%rax)
16: df e8 fucomip %st(0),%st
18: 0d 06 d2 00 eb or $0xeb00d206,%eax
1d: d9 66 2e fldenv 0x2e(%rsi)
20: 0f 1f 84 00 00 00 00 nopl 0x0(%rax,%rax,1)
27: 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 0d a1 da ff call 0xffdaa149
3c: 4c rex.WR
3d: 8d .byte 0x8d
3e: b3 c0 mov $0xc0,%bl