==================================================================
BUG: KASAN: slab-out-of-bounds in stack_map_get_build_id_offset+0x833/0x9b0 kernel/bpf/stackmap.c:147
Write of size 4 at addr ffff888110a2ab30 by task syz-executor153/306

CPU: 1 PID: 306 Comm: syz-executor153 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
Call Trace:
 <TASK>
 __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
 __asan_report_store4_noabort+0x17/0x20 mm/kasan/report_generic.c:355
 stack_map_get_build_id_offset+0x833/0x9b0 kernel/bpf/stackmap.c:147
 __bpf_get_stackid+0x5ac/0x960 kernel/bpf/stackmap.c:250
 ____bpf_get_stackid_pe kernel/bpf/stackmap.c:365 [inline]
 bpf_get_stackid_pe+0x2ee/0x400 kernel/bpf/stackmap.c:334
 bpf_prog_2414a5d5030ea31b+0x21/0x25
 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_swevent_overflow kernel/events/core.c:9531 [inline]
 perf_swevent_event+0x243/0x440 kernel/events/core.c:9582
 do_perf_sw_event kernel/events/core.c:9695 [inline]
 ___perf_sw_event+0x3bf/0x500 kernel/events/core.c:9726
 __perf_sw_event+0x134/0x270 kernel/events/core.c:9738
 perf_sw_event include/linux/perf_event.h:1250 [inline]
 do_user_addr_fault+0xfe9/0x1030 arch/x86/mm/fault.c:1285
 handle_page_fault arch/x86/mm/fault.c:1464 [inline]
 exc_page_fault+0x51/0xb0 arch/x86/mm/fault.c:1517
 asm_exc_page_fault+0x27/0x30 arch/x86/include/asm/idtentry.h:608
RIP: 0010:copy_user_short_string+0x24/0x40 arch/x86/lib/copy_user_64.S:243
Code: 90 90 90 90 90 90 89 d1 83 e2 07 c1 e9 03 74 12 4c 8b 06 4c 89 07 48 8d 76 08 48 8d 7f 08 ff c9 75 ee 21 d2 74 10 89 d1 8a 06 <88> 07 48 ff c6 48 ff c7 ff c9 75 f2 31 c0 0f 01 ca c3 8d 14 ca eb
RSP: 0018:ffffc90000ea6e98 EFLAGS: 00050206
RAX: ffffffff82693530 RBX: 0000000000000003 RCX: 0000000000000003
RDX: 0000000000000003 RSI: ffff88810ffdc66c RDI: 00000000000001c0
RBP: ffffc90000ea6ec0 R08: ffff88810ffdc66e R09: 1ffff11021ffb8cd
R10: dffffc0000000000 R11: ffffed1021ffb8ce R12: 00007fffffffeffd
R13: 0000000000000003 R14: 00000000000001c0 R15: ffff88810ffdc66c
 copy_to_user include/linux/uaccess.h:169 [inline]
 bpf_verifier_vlog+0x179/0x390 kernel/bpf/log.c:34
 verbose+0x1f0/0x2b0 kernel/bpf/verifier.c:303
 print_insn_state+0x132/0x1c0 kernel/bpf/verifier.c:930
 do_check+0x4127/0xf140 kernel/bpf/verifier.c:12501
 do_check_common+0x11c3/0x1970 kernel/bpf/verifier.c:14940
 do_check_main kernel/bpf/verifier.c:15003 [inline]
 bpf_check+0xa04e/0x10e90 kernel/bpf/verifier.c:15580
 bpf_prog_load+0x10f4/0x1670 kernel/bpf/syscall.c:2624
 __sys_bpf+0x57b/0x850 kernel/bpf/syscall.c:5006
 __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
RIP: 0033:0x7f1a4e815949
Code: c0 79 93 eb d5 48 8d 7c 1d 00 eb 99 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 d8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fffcd5847d8 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f1a4e815949
RDX: 0000000000000024 RSI: 0000200000000680 RDI: 0000000000000005
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000006
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f1a4e8a8c40 R15: 0000000000000002
 </TASK>

Allocated by task 306:
 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 ffff888110a2a800
 which belongs to the cache kmalloc-1k of size 1024
The buggy address is located 816 bytes inside of
 1024-byte region [ffff888110a2a800, ffff888110a2ac00)

The buggy address belongs to the physical page:
page:ffffea0004428a00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x110a28
head:ffffea0004428a00 order:3 compound_mapcount:0 compound_pincount:0
flags: 0x4000000000010200(slab|head|zone=1)
raw: 4000000000010200 dead000000000100 dead000000000122 ffff888100043080
raw: 0000000000000000 0000000080100010 00000001ffffffff 0000000000000000
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 92, tgid 92 (klogd), ts 3677648659, free_ts 0
 set_page_owner include/linux/page_owner.h:33 [inline]
 post_alloc_hook+0x1f5/0x210 mm/page_alloc.c:2673
 prep_new_page+0x1c/0x110 mm/page_alloc.c:2680
 get_page_from_freelist+0x2ca9/0x2d20 mm/page_alloc.c:4587
 __alloc_pages+0x1fa/0x610 mm/page_alloc.c:5931
 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
 __do_kmalloc_node mm/slab_common.c:937 [inline]
 __kmalloc_node_track_caller+0xa1/0x1e0 mm/slab_common.c:958
 kmalloc_reserve net/core/skbuff.c:449 [inline]
 __alloc_skb+0x226/0x4a0 net/core/skbuff.c:518
 alloc_skb include/linux/skbuff.h:1322 [inline]
 alloc_skb_with_frags+0xa8/0x620 net/core/skbuff.c:6176
 sock_alloc_send_pskb+0x87f/0x9a0 net/core/sock.c:2770
 unix_dgram_sendmsg+0x5c1/0x1710 net/unix/af_unix.c:1949
 sock_sendmsg_nosec net/socket.c:716 [inline]
 __sock_sendmsg net/socket.c:728 [inline]
 __sys_sendto+0x4ac/0x660 net/socket.c:2143
 __do_sys_sendto net/socket.c:2155 [inline]
 __se_sys_sendto net/socket.c:2151 [inline]
 __x64_sys_sendto+0xe5/0x100 net/socket.c:2151
page_owner free stack trace missing

Memory state around the buggy address:
 ffff888110a2aa00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff888110a2aa80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff888110a2ab00: 00 00 00 00 00 00 fc fc fc fc fc fc fc fc fc fc
                                     ^
 ffff888110a2ab80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff888110a2ac00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
==================================================================
syz-executor153 (306) used greatest stack depth: 21664 bytes left
----------------
Code disassembly (best guess):
   0:	90                   	nop
   1:	90                   	nop
   2:	90                   	nop
   3:	90                   	nop
   4:	90                   	nop
   5:	90                   	nop
   6:	89 d1                	mov    %edx,%ecx
   8:	83 e2 07             	and    $0x7,%edx
   b:	c1 e9 03             	shr    $0x3,%ecx
   e:	74 12                	je     0x22
  10:	4c 8b 06             	mov    (%rsi),%r8
  13:	4c 89 07             	mov    %r8,(%rdi)
  16:	48 8d 76 08          	lea    0x8(%rsi),%rsi
  1a:	48 8d 7f 08          	lea    0x8(%rdi),%rdi
  1e:	ff c9                	dec    %ecx
  20:	75 ee                	jne    0x10
  22:	21 d2                	and    %edx,%edx
  24:	74 10                	je     0x36
  26:	89 d1                	mov    %edx,%ecx
  28:	8a 06                	mov    (%rsi),%al
* 2a:	88 07                	mov    %al,(%rdi) <-- trapping instruction
  2c:	48 ff c6             	inc    %rsi
  2f:	48 ff c7             	inc    %rdi
  32:	ff c9                	dec    %ecx
  34:	75 f2                	jne    0x28
  36:	31 c0                	xor    %eax,%eax
  38:	0f 01 ca             	clac
  3b:	c3                   	ret
  3c:	8d 14 ca             	lea    (%rdx,%rcx,8),%edx
  3f:	eb                   	.byte 0xeb