==================================================================
BUG: KASAN: slab-out-of-bounds in __bpf_get_stackid+0x6fa/0x960 kernel/bpf/stackmap.c:274
Write of size 72 at addr ffff8881298afc90 by task syz.3.73/578
CPU: 0 PID: 578 Comm: syz.3.73 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
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_6611c23d801ea08d+0x21/0x36
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+0x3d0/0x5e0 kernel/events/core.c:10273
__perf_event_overflow+0x437/0x620 kernel/events/core.c:9448
perf_event_overflow kernel/events/core.c:9469 [inline]
perf_swevent_hrtimer+0x400/0x5b0 kernel/events/core.c:10919
__run_hrtimer kernel/time/hrtimer.c:1685 [inline]
__hrtimer_run_queues+0x3bb/0x8e0 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:memset+0x39/0x40 mm/kasan/shadow.c:48
Code: 49 89 ff 48 8b 4d 08 48 89 d6 ba 01 00 00 00 e8 5d e7 ff ff 84 c0 74 10 4c 89 ff 44 89 f6 48 89 da e8 eb 8c 3f 03 eb 02 31 c0 <5b> 41 5e 41 5f 5d c3 90 90 90 90 90 90 90 90 90 90 90 b8 84 84 3e
RSP: 0018:ffffc9001110fb38 EFLAGS: 00000202
RAX: ffffc9001110fbe0 RBX: 0000000000000018 RCX: 0000000000000000
RDX: 0000000000000018 RSI: 0000000000000000 RDI: ffffc9001110fbf8
RBP: ffffc9001110fb50 R08: ffffc9001110fbf7 R09: ffffc9001110fbe0
R10: dffffc0000000000 R11: fffff52002221f7f R12: 00007fdbbee15fac
R13: 1ffff92002221f78 R14: 0000000000000000 R15: ffffc9001110fbe0
futex_wake+0xbb/0x8e0 kernel/futex/waitwake.c:148
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: 0033:0x7fdbbeb9cdd9
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:00007fdbbf9f80e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: ffffffffffffffda RBX: 00007fdbbee15fa8 RCX: 00007fdbbeb9cdd9
RDX: 00000000000f4240 RSI: 0000000000000081 RDI: 00007fdbbee15fac
RBP: 00007fdbbee15fa0 R08: 002015f8a4d00b72 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fdbbee16038 R14: 00007ffc5b5f44f0 R15: 00007ffc5b5f45d8
Allocated by task 578:
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: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 ffff8881298afc80
which belongs to the cache kmalloc-64 of size 64
The buggy address is located 16 bytes inside of
64-byte region [ffff8881298afc80, ffff8881298afcc0)
The buggy address belongs to the physical page:
page:ffffea0004a62bc0 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1298af
flags: 0x4000000000000200(slab|zone=1)
raw: 4000000000000200 0000000000000000 dead000000000122 ffff888100042780
raw: 0000000000000000 0000000080200020 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 34566891082, free_ts 34557967761
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+0x2d12/0x2d80 mm/page_alloc.c:4585
__alloc_pages+0x1fa/0x610 mm/page_alloc.c:5926
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]
kzalloc include/linux/slab.h:699 [inline]
alloc_task_dma_buf_info drivers/dma-buf/dma-buf.c:502 [inline]
compute_dmabuf_info drivers/dma-buf/dma-buf.c:530 [inline]
copy_dmabuf_info+0x33c/0xec0 drivers/dma-buf/dma-buf.c:665
copy_process+0x1b32/0x3510 kernel/fork.c:2574
kernel_clone+0x22f/0x820 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
x64_sys_call+0x990/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:57
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:1580 [inline]
free_pcp_prepare mm/page_alloc.c:1654 [inline]
free_unref_page_prepare+0x7f8/0x800 mm/page_alloc.c:3620
free_unref_page_list+0x117/0x8c0 mm/page_alloc.c:3771
release_pages+0xc93/0xcf0 mm/swap.c:1053
free_pages_and_swap_cache+0x86/0xa0 mm/swap_state.c:316
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:1319
mmput+0x4b/0x150 kernel/fork.c:1343
exit_mm kernel/exit.c:568 [inline]
do_exit+0x994/0x2660 kernel/exit.c:873
do_group_exit+0x210/0x2d0 kernel/exit.c:1028
get_signal+0x13b5/0x1520 kernel/signal.c:2891
arch_do_signal_or_restart+0xd1/0x1140 arch/x86/kernel/signal.c:871
exit_to_user_mode_loop+0x7a/0xb0 kernel/entry/common.c:174
exit_to_user_mode_prepare+0x87/0xd0 kernel/entry/common.c:210
__syscall_exit_to_user_mode_work kernel/entry/common.c:292 [inline]
syscall_exit_to_user_mode+0x1a/0x30 kernel/entry/common.c:303
ret_from_fork+0x15/0x30 arch/x86/entry/entry_64.S:288
Memory state around the buggy address:
ffff8881298afb80: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
ffff8881298afc00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff8881298afc80: 00 00 00 00 00 fc fc fc fc fc fc fc fc fc fc fc
^
ffff8881298afd00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff8881298afd80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
==================================================================
----------------
Code disassembly (best guess):
0: 49 89 ff mov %rdi,%r15
3: 48 8b 4d 08 mov 0x8(%rbp),%rcx
7: 48 89 d6 mov %rdx,%rsi
a: ba 01 00 00 00 mov $0x1,%edx
f: e8 5d e7 ff ff call 0xffffe771
14: 84 c0 test %al,%al
16: 74 10 je 0x28
18: 4c 89 ff mov %r15,%rdi
1b: 44 89 f6 mov %r14d,%esi
1e: 48 89 da mov %rbx,%rdx
21: e8 eb 8c 3f 03 call 0x33f8d11
26: eb 02 jmp 0x2a
28: 31 c0 xor %eax,%eax
* 2a: 5b pop %rbx <-- trapping instruction
2b: 41 5e pop %r14
2d: 41 5f pop %r15
2f: 5d pop %rbp
30: c3 ret
31: 90 nop
32: 90 nop
33: 90 nop
34: 90 nop
35: 90 nop
36: 90 nop
37: 90 nop
38: 90 nop
39: 90 nop
3a: 90 nop
3b: 90 nop
3c: b8 .byte 0xb8
3d: 84 .byte 0x84
3e: 84 3e test %bh,(%rsi)