==================================================================
BUG: KASAN: slab-out-of-bounds in __bpf_get_stackid+0x6fa/0x960 kernel/bpf/stackmap.c:274
Write of size 64 at addr ffff88811e18e090 by task syz.3.1801/6562
CPU: 1 PID: 6562 Comm: syz.3.1801 Tainted: G W syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/24/2026
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_47bcecfbcadd1995+0x21/0x39
bpf_dispatcher_nop_func include/linux/bpf.h:987 [inline]
__bpf_prog_run include/linux/filter.h:596 [inline]
bpf_prog_run include/linux/filter.h:614 [inline]
bpf_overflow_handler+0x51f/0x5e0 kernel/events/core.c:10238
__perf_event_overflow+0x437/0x620 kernel/events/core.c:9448
perf_swevent_hrtimer+0x400/0x5b0 kernel/events/core.c:10879
__run_hrtimer kernel/time/hrtimer.c:1685 [inline]
__hrtimer_run_queues+0x3d5/0xa00 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:futex_wake+0x1cd/0x8e0 kernel/futex/waitwake.c:-1
Code: ff 89 de e8 05 c4 09 00 85 db 0f 84 f7 03 00 00 4c 8d a4 24 c0 00 00 00 49 8d 7f 04 48 89 7c 24 40 e8 87 a5 98 03 49 83 c7 08 <48> 8d 7c 24 48 ba 18 00 00 00 4c 89 f6 e8 31 f1 4e 00 4c 89 7c 24
RSP: 0018:ffffc90000aa7b60 EFLAGS: 00000286
RAX: b7bc02347bc1b300 RBX: 0000000000000001 RCX: 0000000000000001
RDX: 0000000000000001 RSI: 0000000000000004 RDI: ffffc90000aa7ae0
RBP: ffffc90000aa7cd0 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffff52000154f5c R12: ffffc90000aa7c20
R13: 1ffff92000154f78 R14: ffffc90000aa7be0 R15: ffff888100349f88
do_futex+0x2bf/0x430 kernel/futex/syscalls.c:141
__do_sys_futex kernel/futex/syscalls.c:213 [inline]
__se_sys_futex+0x136/0x310 kernel/futex/syscalls.c:194
__x64_sys_futex+0xe5/0x100 kernel/futex/syscalls.c:194
x64_sys_call+0x7ec/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:203
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: 0033:0x7f4fec39aeb9
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:00007f4fed29d0e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: ffffffffffffffda RBX: 00007f4fec615fa8 RCX: 00007f4fec39aeb9
RDX: 00000000000f4240 RSI: 0000000000000081 RDI: 00007f4fec615fac
RBP: 00007f4fec615fa0 R08: 00118aa25e5a2dca R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f4fec616038 R14: 00007ffddae69c40 R15: 00007ffddae69d28
Allocated by task 6562:
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:4987
__do_sys_bpf kernel/bpf/syscall.c:5109 [inline]
__se_sys_bpf kernel/bpf/syscall.c:5107 [inline]
__x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:5107
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 ffff88811e18e080
which belongs to the cache kmalloc-64 of size 64
The buggy address is located 16 bytes inside of
64-byte region [ffff88811e18e080, ffff88811e18e0c0)
The buggy address belongs to the physical page:
page:ffffea0004786380 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x11e18e
flags: 0x4000000000000200(slab|zone=1)
raw: 4000000000000200 ffffea0004ca5580 dead000000000004 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 0x12cc0(GFP_KERNEL|__GFP_NOWARN|__GFP_NORETRY), pid 158, tgid 158 (dhcpcd), ts 6844811573, free_ts 6843762884
set_page_owner include/linux/page_owner.h:33 [inline]
post_alloc_hook+0x1f5/0x210 mm/page_alloc.c:2643
prep_new_page+0x1c/0x110 mm/page_alloc.c:2650
get_page_from_freelist+0x2d12/0x2d80 mm/page_alloc.c:4554
__alloc_pages+0x1d9/0x480 mm/page_alloc.c:5868
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]
load_elf_binary+0x1f5f/0x2800 fs/binfmt_elf.c:937
search_binary_handler fs/exec.c:1767 [inline]
exec_binprm fs/exec.c:1808 [inline]
bprm_execve+0x79b/0x1450 fs/exec.c:1877
do_execveat_common+0x915/0xa70 fs/exec.c:1982
do_execve fs/exec.c:2056 [inline]
__do_sys_execve fs/exec.c:2132 [inline]
__se_sys_execve fs/exec.c:2127 [inline]
__x64_sys_execve+0x92/0xb0 fs/exec.c:2127
x64_sys_call+0x98/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:60
do_syscall_x64 arch/x86/entry/common.c:46 [inline]
do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76
page last free stack trace:
reset_page_owner include/linux/page_owner.h:26 [inline]
free_pages_prepare mm/page_alloc.c:1551 [inline]
free_pcp_prepare mm/page_alloc.c:1625 [inline]
free_unref_page_prepare+0x742/0x750 mm/page_alloc.c:3589
free_unref_page_list+0x117/0x8c0 mm/page_alloc.c:3740
release_pages+0xaf2/0xb50 mm/swap.c:1048
free_pages_and_swap_cache+0x86/0xa0 mm/swap_state.c:315
tlb_batch_pages_flush mm/mmu_gather.c:59 [inline]
tlb_flush_mmu_free mm/mmu_gather.c:254 [inline]
tlb_flush_mmu mm/mmu_gather.c:261 [inline]
tlb_finish_mmu+0x1aa/0x370 mm/mmu_gather.c:361
exit_mmap+0x412/0xc10 mm/mmap.c:3384
__mmput+0x93/0x360 kernel/fork.c:1309
mmput+0x4b/0x150 kernel/fork.c:1333
exit_mm kernel/exit.c:568 [inline]
do_exit+0x994/0x2660 kernel/exit.c:873
do_group_exit+0x210/0x2d0 kernel/exit.c:1028
__do_sys_exit_group kernel/exit.c:1039 [inline]
__se_sys_exit_group kernel/exit.c:1037 [inline]
__x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1037
x64_sys_call+0x7b4/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:232
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:
ffff88811e18df80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
ffff88811e18e000: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc
>ffff88811e18e080: 00 00 00 00 00 fc fc fc fc fc fc fc fc fc fc fc
^
ffff88811e18e100: 00 00 00 00 00 00 fc fc fc fc fc fc fc fc fc fc
ffff88811e18e180: 00 00 00 00 00 00 fc fc fc fc fc fc fc fc fc fc
==================================================================
----------------
Code disassembly (best guess):
0: ff 89 de e8 05 c4 decl -0x3bfa1722(%rcx)
6: 09 00 or %eax,(%rax)
8: 85 db test %ebx,%ebx
a: 0f 84 f7 03 00 00 je 0x407
10: 4c 8d a4 24 c0 00 00 lea 0xc0(%rsp),%r12
17: 00
18: 49 8d 7f 04 lea 0x4(%r15),%rdi
1c: 48 89 7c 24 40 mov %rdi,0x40(%rsp)
21: e8 87 a5 98 03 call 0x398a5ad
26: 49 83 c7 08 add $0x8,%r15
* 2a: 48 8d 7c 24 48 lea 0x48(%rsp),%rdi <-- trapping instruction
2f: ba 18 00 00 00 mov $0x18,%edx
34: 4c 89 f6 mov %r14,%rsi
37: e8 31 f1 4e 00 call 0x4ef16d
3c: 4c rex.WR
3d: 89 .byte 0x89
3e: 7c 24 jl 0x64