==================================================================
BUG: KASAN: slab-out-of-bounds in __bpf_get_stackid+0x677/0xcf0 kernel/bpf/stackmap.c:265
Write of size 8 at addr ffff88802f870a48 by task syz.0.46/6154
CPU: 1 UID: 0 PID: 6154 Comm: syz.0.46 Not tainted 6.17.0-rc1-syzkaller-ge4414b01c1cd #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
Call Trace:
dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120
print_address_description mm/kasan/report.c:378 [inline]
print_report+0xca/0x240 mm/kasan/report.c:482
kasan_report+0x118/0x150 mm/kasan/report.c:595
__bpf_get_stackid+0x677/0xcf0 kernel/bpf/stackmap.c:265
____bpf_get_stackid_raw_tp kernel/trace/bpf_trace.c:1810 [inline]
bpf_get_stackid_raw_tp+0x196/0x210 kernel/trace/bpf_trace.c:1799
bpf_prog_b724608cae728045+0x27/0x2f
bpf_dispatcher_nop_func include/linux/bpf.h:1332 [inline]
__bpf_prog_run include/linux/filter.h:718 [inline]
bpf_prog_run include/linux/filter.h:725 [inline]
__bpf_trace_run kernel/trace/bpf_trace.c:2257 [inline]
bpf_trace_run2+0x284/0x4b0 kernel/trace/bpf_trace.c:2298
__do_trace_kfree include/trace/events/kmem.h:94 [inline]
trace_kfree include/trace/events/kmem.h:94 [inline]
kfree+0x3a0/0x440 mm/slub.c:4866
slab_free_after_rcu_debug+0x60/0x2a0 mm/slub.c:4717
rcu_do_batch kernel/rcu/tree.c:2605 [inline]
rcu_core+0xca8/0x1770 kernel/rcu/tree.c:2861
handle_softirqs+0x283/0x870 kernel/softirq.c:579
__do_softirq kernel/softirq.c:613 [inline]
invoke_softirq kernel/softirq.c:453 [inline]
__irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:680
irq_exit_rcu+0x9/0x30 kernel/softirq.c:696
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1050 [inline]
sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1050
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:preempt_schedule_irq+0xb0/0x150 kernel/sched/core.c:7288
Code: 24 20 f6 44 24 21 02 74 0c 90 0f 0b 48 f7 03 08 00 00 00 74 64 bf 01 00 00 00 e8 5b 98 15 f6 e8 96 f2 4c f6 fb bf 01 00 00 00 5b ab ff ff 48 c7 44 24 40 00 00 00 00 9c 8f 44 24 40 8b 44 24
RSP: 0018:ffffc9000258f540 EFLAGS: 00000286
RAX: ec97eb19a4044700 RBX: 0000000000000000 RCX: ec97eb19a4044700
RDX: 0000000000000000 RSI: ffffffff8d9b6d6c RDI: 0000000000000001
RBP: ffffc9000258f5e0 R08: ffffffff8fa37e37 R09: 1ffffffff1f46fc6
R10: dffffc0000000000 R11: fffffbfff1f46fc7 R12: 0000000000000000
R13: 0000000000000000 R14: dffffc0000000000 R15: 1ffff920004b1ea8
irqentry_exit+0x6f/0x90 kernel/entry/common.c:197
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:deref_stack_reg+0x1ae/0x230 arch/x86/kernel/unwind_orc.c:406
Code: d8 0f 97 c1 4c 39 f0 0f 96 c0 20 c8 3c 01 75 30 4c 89 c7 49 89 f7 e8 11 08 00 00 49 89 c6 48 8b 5c 24 18 48 89 d8 48 c1 e8 03 <42> 80 3c 38 00 74 08 48 89 df e8 73 31 b0 00 4c 89 33 b0 01 eb 02
RSP: 0018:ffffc9000258f6a0 EFLAGS: 00000a02
RAX: 1ffff920004b1f0d RBX: ffffc9000258f868 RCX: 0000000000000001
RDX: ffffc9000258f868 RSI: dffffc0000000000 RDI: ffffc9000258f818
RBP: 1ffff920004b1f05 R08: ffffc9000258f818 R09: 0000000000000000
R10: ffffc9000258f878 R11: fffff520004b1f11 R12: 1ffff920004b1f06
R13: 1ffff920004b1f07 R14: ffffc9000258f8b0 R15: dffffc0000000000
unwind_next_frame+0x17c4/0x2390 arch/x86/kernel/unwind_orc.c:-1
__unwind_start+0x5b9/0x760 arch/x86/kernel/unwind_orc.c:758
unwind_start arch/x86/include/asm/unwind.h:64 [inline]
arch_stack_walk+0xe4/0x150 arch/x86/kernel/stacktrace.c:24
stack_trace_save+0x9c/0xe0 kernel/stacktrace.c:122
kasan_save_stack+0x3e/0x60 mm/kasan/common.c:47
kasan_record_aux_stack+0xbd/0xd0 mm/kasan/generic.c:548
task_work_add+0xb1/0x420 kernel/task_work.c:65
__fput_deferred+0x154/0x390 fs/file_table.c:529
fput_close+0x119/0x200 fs/file_table.c:585
filp_close+0x27/0x40 fs/open.c:1561
__range_close fs/file.c:767 [inline]
__do_sys_close_range fs/file.c:826 [inline]
__se_sys_close_range+0x359/0x650 fs/file.c:790
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f8e1918ebe9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffeb094b308 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4
RAX: ffffffffffffffda RBX: 000000000001f26a RCX: 00007f8e1918ebe9
RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003
RBP: 0000000000000000 R08: 0000000000000001 R09: 00000005b094b5ff
R10: 0000001b31720000 R11: 0000000000000246 R12: 00007f8e193b5fac
R13: 00007f8e193b5fa0 R14: ffffffffffffffff R15: 0000000000000005
Allocated by task 6154:
kasan_save_stack mm/kasan/common.c:47 [inline]
kasan_save_track+0x3e/0x80 mm/kasan/common.c:68
poison_kmalloc_redzone mm/kasan/common.c:388 [inline]
__kasan_kmalloc+0x93/0xb0 mm/kasan/common.c:405
kasan_kmalloc include/linux/kasan.h:260 [inline]
__do_kmalloc_node mm/slub.c:4365 [inline]
__kmalloc_node_noprof+0x276/0x4e0 mm/slub.c:4371
kmalloc_node_noprof include/linux/slab.h:932 [inline]
__bpf_map_area_alloc kernel/bpf/syscall.c:393 [inline]
bpf_map_area_alloc+0x64/0x180 kernel/bpf/syscall.c:406
prealloc_elems_and_freelist+0x86/0x1d0 kernel/bpf/stackmap.c:51
stack_map_alloc+0x33f/0x4c0 kernel/bpf/stackmap.c:114
map_create+0xaa0/0x14d0 kernel/bpf/syscall.c:1480
__sys_bpf+0x60f/0x870 kernel/bpf/syscall.c:6011
__do_sys_bpf kernel/bpf/syscall.c:6139 [inline]
__se_sys_bpf kernel/bpf/syscall.c:6137 [inline]
__x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:6137
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
The buggy address belongs to the object at ffff88802f870800
which belongs to the cache kmalloc-cg-1k of size 1024
The buggy address is located 8 bytes to the right of
allocated 576-byte region [ffff88802f870800, ffff88802f870a40)
The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x2f870
head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
memcg:ffff88805a865101
ksm flags: 0xfff00000000040(head|node=0|zone=1|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 00fff00000000040 ffff88801a44b280 ffffea000092b600 0000000000000003
raw: 0000000000000000 0000000080100010 00000000f5000000 ffff88805a865101
head: 00fff00000000040 ffff88801a44b280 ffffea000092b600 0000000000000003
head: 0000000000000000 0000000080100010 00000000f5000000 ffff88805a865101
head: 00fff00000000003 ffffea0000be1c01 00000000ffffffff 00000000ffffffff
head: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000008
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 3, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 5914, tgid 5914 (syz-executor), ts 111887872514, free_ts 88604521131
set_page_owner include/linux/page_owner.h:32 [inline]
post_alloc_hook+0x240/0x2a0 mm/page_alloc.c:1851
prep_new_page mm/page_alloc.c:1859 [inline]
get_page_from_freelist+0x21e4/0x22c0 mm/page_alloc.c:3858
__alloc_frozen_pages_noprof+0x181/0x370 mm/page_alloc.c:5148
alloc_pages_mpol+0x232/0x4a0 mm/mempolicy.c:2416
alloc_slab_page mm/slub.c:2487 [inline]
allocate_slab+0x8a/0x370 mm/slub.c:2655
new_slab mm/slub.c:2709 [inline]
___slab_alloc+0xbeb/0x1410 mm/slub.c:3891
__slab_alloc mm/slub.c:3981 [inline]
__slab_alloc_node mm/slub.c:4056 [inline]
slab_alloc_node mm/slub.c:4217 [inline]
__do_kmalloc_node mm/slub.c:4364 [inline]
__kmalloc_noprof+0x305/0x4f0 mm/slub.c:4377
kmalloc_noprof include/linux/slab.h:909 [inline]
kzalloc_noprof include/linux/slab.h:1039 [inline]
__register_sysctl_table+0x72/0x1340 fs/proc/proc_sysctl.c:1379
ip_vs_control_net_init_sysctl net/netfilter/ipvs/ip_vs_ctl.c:4370 [inline]
ip_vs_control_net_init+0x1313/0x1900 net/netfilter/ipvs/ip_vs_ctl.c:4462
__ip_vs_init+0x2d2/0x460 net/netfilter/ipvs/ip_vs_core.c:2308
ops_init+0x359/0x5c0 net/core/net_namespace.c:136
setup_net+0x10c/0x320 net/core/net_namespace.c:438
copy_net_ns+0x31b/0x4d0 net/core/net_namespace.c:570
create_new_namespaces+0x3f3/0x720 kernel/nsproxy.c:110
unshare_nsproxy_namespaces+0x11c/0x170 kernel/nsproxy.c:218
ksys_unshare+0x4c8/0x8c0 kernel/fork.c:3127
page last free pid 5712 tgid 5712 stack trace:
reset_page_owner include/linux/page_owner.h:25 [inline]
free_pages_prepare mm/page_alloc.c:1395 [inline]
__free_frozen_pages+0xbc4/0xd30 mm/page_alloc.c:2895
__folio_put+0x21b/0x2c0 mm/swap.c:112
put_netmem net/core/skbuff.c:7370 [inline]
skb_page_unref include/linux/skbuff_ref.h:43 [inline]
__skb_frag_unref include/linux/skbuff_ref.h:56 [inline]
skb_release_data+0x49a/0x7c0 net/core/skbuff.c:1080
skb_release_all net/core/skbuff.c:1151 [inline]
__napi_kfree_skb net/core/skbuff.c:1441 [inline]
kfree_skb_napi_cache net/core/skbuff.c:7167 [inline]
skb_attempt_defer_free+0x422/0x5c0 net/core/skbuff.c:7189
tcp_eat_recv_skb net/ipv4/tcp.c:1562 [inline]
tcp_recvmsg_locked+0x248f/0x3660 net/ipv4/tcp.c:2859
tcp_recvmsg+0x216/0x810 net/ipv4/tcp.c:2905
inet_recvmsg+0x147/0x250 net/ipv4/af_inet.c:883
sock_recvmsg_nosec net/socket.c:1065 [inline]
sock_recvmsg+0x1a8/0x270 net/socket.c:1087
sock_read_iter+0x231/0x2f0 net/socket.c:1157
new_sync_read fs/read_write.c:491 [inline]
vfs_read+0x55a/0xa30 fs/read_write.c:572
ksys_read+0x145/0x250 fs/read_write.c:715
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
Memory state around the buggy address:
ffff88802f870900: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
ffff88802f870980: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff88802f870a00: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc
^
ffff88802f870a80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff88802f870b00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
==================================================================
----------------
Code disassembly (best guess):
0: 24 20 and $0x20,%al
2: f6 44 24 21 02 testb $0x2,0x21(%rsp)
7: 74 0c je 0x15
9: 90 nop
a: 0f 0b ud2
c: 48 f7 03 08 00 00 00 testq $0x8,(%rbx)
13: 74 64 je 0x79
15: bf 01 00 00 00 mov $0x1,%edi
1a: e8 5b 98 15 f6 call 0xf615987a
1f: e8 96 f2 4c f6 call 0xf64cf2ba
24: fb sti
25: bf 01 00 00 00 mov $0x1,%edi
* 2a: e8 5b ab ff ff call 0xffffab8a <-- trapping instruction
2f: 48 c7 44 24 40 00 00 movq $0x0,0x40(%rsp)
36: 00 00
38: 9c pushf
39: 8f 44 24 40 pop 0x40(%rsp)
3d: 8b .byte 0x8b
3e: 44 rex.R
3f: 24 .byte 0x24