==================================================================
BUG: KASAN: slab-out-of-bounds in stack_map_get_build_id_offset+0x6c0/0x720 kernel/bpf/stackmap.c:144
Write of size 4 at addr ffff8880262ba330 by task syz.0.19/5934

CPU: 1 PID: 5934 Comm: syz.0.19 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2026
Call Trace:
 <TASK>
 dump_stack_lvl+0x18c/0x250 lib/dump_stack.c:106
 print_address_description mm/kasan/report.c:364 [inline]
 print_report+0xa8/0x210 mm/kasan/report.c:468
 kasan_report+0x117/0x150 mm/kasan/report.c:581
 stack_map_get_build_id_offset+0x6c0/0x720 kernel/bpf/stackmap.c:144
 __bpf_get_stackid+0x564/0x900 kernel/bpf/stackmap.c:247
 ____bpf_get_stackid_pe kernel/bpf/stackmap.c:362 [inline]
 bpf_get_stackid_pe+0x343/0x410 kernel/bpf/stackmap.c:331
 bpf_prog_2414a5d5030ea31b+0x29/0x2d
 bpf_dispatcher_nop_func include/linux/bpf.h:1224 [inline]
 __bpf_prog_run include/linux/filter.h:617 [inline]
 bpf_prog_run include/linux/filter.h:624 [inline]
 bpf_overflow_handler+0x1fc/0x510 kernel/events/core.c:10584
 __perf_event_overflow+0x461/0x660 kernel/events/core.c:9720
 perf_swevent_overflow kernel/events/core.c:9803 [inline]
 perf_swevent_event+0x319/0x570 kernel/events/core.c:9854
 do_perf_sw_event kernel/events/core.c:9967 [inline]
 ___perf_sw_event+0x4ab/0x730 kernel/events/core.c:9998
 __perf_sw_event+0x139/0x270 kernel/events/core.c:10010
 perf_sw_event include/linux/perf_event.h:1442 [inline]
 do_user_addr_fault+0x1242/0x12d0 arch/x86/mm/fault.c:1278
 handle_page_fault arch/x86/mm/fault.c:1463 [inline]
 exc_page_fault+0x64/0x100 arch/x86/mm/fault.c:1516
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:608
RIP: 0010:rep_movs_alternative+0x15/0x90 arch/x86/lib/copy_user_64.S:44
Code: 8b 1c 24 4c 8b 64 24 08 48 83 c4 10 c3 cc cc cc cc cc cc cc cc f3 0f 1e fa 48 83 f9 40 73 40 83 f9 08 73 21 85 c9 74 0f 8a 06 <88> 07 48 ff c7 48 ff c6 48 ff c9 75 f1 c3 66 2e 0f 1f 84 00 00 00
RSP: 0018:ffffc90003416f50 EFLAGS: 00050206
RAX: ffffffff84342c30 RBX: 0000000000000003 RCX: 0000000000000003
RDX: 0000000000000000 RSI: ffff88805fabc68c RDI: 00000000000001c0
RBP: ffff88805fabc668 R08: ffff88805fabc68e R09: 1ffff1100bf578d1
R10: dffffc0000000000 R11: ffffed100bf578d2 R12: 00000000000001c3
R13: 0000000000000003 R14: 00000000000001c0 R15: ffff88805fabc68c
 copy_user_generic arch/x86/include/asm/uaccess_64.h:112 [inline]
 raw_copy_to_user arch/x86/include/asm/uaccess_64.h:133 [inline]
 _copy_to_user+0x85/0xa0 lib/usercopy.c:41
 copy_to_user include/linux/uaccess.h:191 [inline]
 bpf_verifier_vlog+0x2f1/0x840 kernel/bpf/log.c:124
 verbose+0x11e/0x1a0 kernel/bpf/verifier.c:370
 print_insn_state+0x130/0x160 kernel/bpf/verifier.c:1566
 do_check+0x4f08/0xd0a0 kernel/bpf/verifier.c:17330
 do_check_common+0xacc/0x1410 kernel/bpf/verifier.c:19903
 do_check_main kernel/bpf/verifier.c:19966 [inline]
 bpf_check+0x65df/0xec40 kernel/bpf/verifier.c:20646
 bpf_prog_load+0x10fa/0x1610 kernel/bpf/syscall.c:2753
 __sys_bpf+0x5ba/0x890 kernel/bpf/syscall.c:5491
 __do_sys_bpf kernel/bpf/syscall.c:5595 [inline]
 __se_sys_bpf kernel/bpf/syscall.c:5593 [inline]
 __x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:5593
 do_syscall_x64 arch/x86/entry/common.c:46 [inline]
 do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:76
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f1746b9e159
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:00007ffd9842a0e8 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 00007f1746e25fa0 RCX: 00007f1746b9e159
RDX: 0000000000000024 RSI: 0000200000000680 RDI: 0000000000000005
RBP: 00007f1746c3506b R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f1746e25fac R14: 00007f1746e25fa0 R15: 00007f1746e25fa0
 </TASK>

Allocated by task 5934:
 kasan_save_stack mm/kasan/common.c:46 [inline]
 kasan_set_track+0x4e/0x70 mm/kasan/common.c:53
 ____kasan_kmalloc mm/kasan/common.c:375 [inline]
 __kasan_kmalloc+0x8f/0xa0 mm/kasan/common.c:384
 kasan_kmalloc include/linux/kasan.h:198 [inline]
 __do_kmalloc_node mm/slab_common.c:1007 [inline]
 __kmalloc_node+0xb6/0x240 mm/slab_common.c:1014
 kmalloc_node include/linux/slab.h:620 [inline]
 __bpf_map_area_alloc kernel/bpf/syscall.c:303 [inline]
 bpf_map_area_alloc+0x5e/0x110 kernel/bpf/syscall.c:316
 prealloc_elems_and_freelist+0x86/0x1c0 kernel/bpf/stackmap.c:51
 stack_map_alloc+0x32b/0x4b0 kernel/bpf/stackmap.c:114
 map_create+0x877/0x12f0 kernel/bpf/syscall.c:1247
 __sys_bpf+0x651/0x890 kernel/bpf/syscall.c:5473
 __do_sys_bpf kernel/bpf/syscall.c:5595 [inline]
 __se_sys_bpf kernel/bpf/syscall.c:5593 [inline]
 __x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:5593
 do_syscall_x64 arch/x86/entry/common.c:46 [inline]
 do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:76
 entry_SYSCALL_64_after_hwframe+0x68/0xd2

The buggy address belongs to the object at ffff8880262ba000
 which belongs to the cache kmalloc-cg-1k of size 1024
The buggy address is located 0 bytes to the right of
 allocated 816-byte region [ffff8880262ba000, ffff8880262ba330)

The buggy address belongs to the physical page:
page:ffffea000098ae00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x262b8
head:ffffea000098ae00 order:3 entire_mapcount:0 nr_pages_mapped:0 pincount:0
memcg:ffff88802cad4e01
anon flags: 0xfff00000000840(slab|head|node=0|zone=1|lastcpupid=0x7ff)
page_type: 0xffffffff()
raw: 00fff00000000840 ffff888017c4f280 0000000000000000 0000000000000001
raw: 0000000000000000 0000000080100010 00000001ffffffff ffff88802cad4e01
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 5439, tgid 5439 (dhcpcd), ts 57177021467, free_ts 56926758684
 set_page_owner include/linux/page_owner.h:31 [inline]
 post_alloc_hook+0x1c1/0x200 mm/page_alloc.c:1582
 prep_new_page mm/page_alloc.c:1589 [inline]
 get_page_from_freelist+0x2181/0x22a0 mm/page_alloc.c:3221
 __alloc_pages+0x1f0/0x460 mm/page_alloc.c:4501
 alloc_slab_page+0x5d/0x180 mm/slub.c:1881
 allocate_slab mm/slub.c:2028 [inline]
 new_slab+0x87/0x2d0 mm/slub.c:2081
 ___slab_alloc+0xc5c/0x12f0 mm/slub.c:3253
 __slab_alloc mm/slub.c:3339 [inline]
 __slab_alloc_node mm/slub.c:3392 [inline]
 slab_alloc_node mm/slub.c:3485 [inline]
 __kmem_cache_alloc_node+0x11f/0x250 mm/slub.c:3534
 __do_kmalloc_node mm/slab_common.c:1006 [inline]
 __kmalloc_node_track_caller+0xa4/0x230 mm/slab_common.c:1027
 kmalloc_reserve+0x116/0x240 net/core/skbuff.c:584
 __alloc_skb+0x138/0x2c0 net/core/skbuff.c:653
 alloc_skb include/linux/skbuff.h:1316 [inline]
 alloc_skb_with_frags+0xcd/0x7a0 net/core/skbuff.c:6355
 sock_alloc_send_pskb+0x883/0x9a0 net/core/sock.c:2829
 unix_dgram_sendmsg+0x5a9/0x16e0 net/unix/af_unix.c:2003
 sock_sendmsg_nosec net/socket.c:730 [inline]
 __sock_sendmsg net/socket.c:745 [inline]
 sock_write_iter+0x2dc/0x420 net/socket.c:1161
 do_iter_readv_writev fs/read_write.c:-1 [inline]
 do_iter_write+0x747/0xc50 fs/read_write.c:860
 vfs_writev fs/read_write.c:933 [inline]
 do_writev+0x27f/0x480 fs/read_write.c:976
page last free stack trace:
 reset_page_owner include/linux/page_owner.h:24 [inline]
 free_pages_prepare mm/page_alloc.c:1182 [inline]
 free_unref_page_prepare+0x7d7/0x8f0 mm/page_alloc.c:2366
 free_unref_page+0x32/0x2e0 mm/page_alloc.c:2459
 free_large_kmalloc+0x101/0x1b0 mm/slab_common.c:984
 skb_kfree_head net/core/skbuff.c:946 [inline]
 skb_free_head net/core/skbuff.c:958 [inline]
 skb_release_data+0x609/0x7f0 net/core/skbuff.c:988
 skb_release_all net/core/skbuff.c:1054 [inline]
 __kfree_skb net/core/skbuff.c:1068 [inline]
 consume_skb+0xb2/0x110 net/core/skbuff.c:1287
 netlink_recvmsg+0x5e7/0xe60 net/netlink/af_netlink.c:1977
 sock_recvmsg_nosec net/socket.c:1047 [inline]
 sock_recvmsg net/socket.c:1069 [inline]
 ____sys_recvmsg+0x2bd/0x5d0 net/socket.c:2814
 ___sys_recvmsg+0x214/0x590 net/socket.c:2856
 __sys_recvmsg net/socket.c:2886 [inline]
 __do_sys_recvmsg net/socket.c:2896 [inline]
 __se_sys_recvmsg net/socket.c:2893 [inline]
 __x64_sys_recvmsg+0x21e/0x2f0 net/socket.c:2893
 do_syscall_x64 arch/x86/entry/common.c:46 [inline]
 do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:76
 entry_SYSCALL_64_after_hwframe+0x68/0xd2

Memory state around the buggy address:
 ffff8880262ba200: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff8880262ba280: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff8880262ba300: 00 00 00 00 00 00 fc fc fc fc fc fc fc fc fc fc
                                     ^
 ffff8880262ba380: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff8880262ba400: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
==================================================================
----------------
Code disassembly (best guess):
   0:	8b 1c 24             	mov    (%rsp),%ebx
   3:	4c 8b 64 24 08       	mov    0x8(%rsp),%r12
   8:	48 83 c4 10          	add    $0x10,%rsp
   c:	c3                   	ret
   d:	cc                   	int3
   e:	cc                   	int3
   f:	cc                   	int3
  10:	cc                   	int3
  11:	cc                   	int3
  12:	cc                   	int3
  13:	cc                   	int3
  14:	cc                   	int3
  15:	f3 0f 1e fa          	endbr64
  19:	48 83 f9 40          	cmp    $0x40,%rcx
  1d:	73 40                	jae    0x5f
  1f:	83 f9 08             	cmp    $0x8,%ecx
  22:	73 21                	jae    0x45
  24:	85 c9                	test   %ecx,%ecx
  26:	74 0f                	je     0x37
  28:	8a 06                	mov    (%rsi),%al
* 2a:	88 07                	mov    %al,(%rdi) <-- trapping instruction
  2c:	48 ff c7             	inc    %rdi
  2f:	48 ff c6             	inc    %rsi
  32:	48 ff c9             	dec    %rcx
  35:	75 f1                	jne    0x28
  37:	c3                   	ret
  38:	66                   	data16
  39:	2e                   	cs
  3a:	0f                   	.byte 0xf
  3b:	1f                   	(bad)
  3c:	84 00                	test   %al,(%rax)