==================================================================
BUG: KASAN: slab-out-of-bounds in __bpf_get_stackid+0x6fa/0x960 kernel/bpf/stackmap.c:274
Write of size 56 at addr ffff888115995b90 by task syz.0.259/1314
CPU: 1 PID: 1314 Comm: syz.0.259 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
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_a448e89f4c9ad9d1+0x28/0x42
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+0x521/0x5e0 kernel/events/core.c:10273
__perf_event_overflow+0x458/0x640 kernel/events/core.c:9448
perf_event_overflow kernel/events/core.c:9469 [inline]
perf_swevent_hrtimer+0x4b4/0x540 kernel/events/core.c:10919
__run_hrtimer kernel/time/hrtimer.c:1685 [inline]
__hrtimer_run_queues+0x398/0x890 kernel/time/hrtimer.c:1749
hrtimer_interrupt+0x3ad/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:__sanitizer_cov_trace_pc+0x45/0x60 kernel/kcov.c:221
Code: ff 00 74 11 81 fa 00 01 00 00 75 35 83 b9 6c 0b 00 00 00 74 2c 8b 91 48 0b 00 00 83 fa 02 75 21 48 8b 91 50 0b 00 00 48 8b 32 <48> 8d 7e 01 8b 89 4c 0b 00 00 48 39 cf 73 08 48 89 3a 48 89 44 f2
RSP: 0018:ffffc9000ecbfdb0 EFLAGS: 00000246
RAX: ffffffff81673cf8 RBX: 0000000000000000 RCX: ffff88811b4a2880
RDX: ffffc900011b9000 RSI: 0000000000000033 RDI: 0000000000000000
RBP: ffffc9000ecbfdb0 R08: ffffc9000ecbfe4f R09: ffffc9000ecbfe40
R10: dffffc0000000000 R11: fffff52001d97fca R12: 0000000000000081
R13: 1ffff92001d97fc0 R14: 0000000000000000 R15: ffffc9000ecbfe40
__do_sys_futex kernel/futex/syscalls.c:202 [inline]
__se_sys_futex+0x108/0x310 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: 0033:0x7f1beaf9ce59
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:00007f1bebf4c0e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: ffffffffffffffda RBX: 00007f1beb215fa8 RCX: 00007f1beaf9ce59
RDX: 00000000000f4240 RSI: 0000000000000081 RDI: 00007f1beb215fac
RBP: 00007f1beb215fa0 R08: 001e9f7dc09f2a36 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f1beb216038 R14: 00007ffcc8d79920 R15: 00007ffcc8d79a08
Allocated by task 1314:
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 ffff888115995b80
which belongs to the cache kmalloc-64 of size 64
The buggy address is located 16 bytes inside of
64-byte region [ffff888115995b80, ffff888115995bc0)
The buggy address belongs to the physical page:
page:ffffea0004566540 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x115995
flags: 0x4000000000000200(slab|zone=1)
raw: 4000000000000200 ffffea0004cee540 dead000000000006 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 0x16cc0(GFP_KERNEL|__GFP_NOWARN|__GFP_RETRY_MAYFAIL|__GFP_NORETRY), pid 108, tgid 108 (udevd), ts 5546502248, free_ts 0
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+0x2ca9/0x2d20 mm/page_alloc.c:4586
__alloc_pages+0x1fa/0x610 mm/page_alloc.c:5930
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+0xa4/0x1e0 mm/slab_common.c:951
kmalloc include/linux/slab.h:568 [inline]
inotify_handle_inode_event+0x18f/0x4e0 fs/notify/inotify/inotify_fsnotify.c:96
fsnotify_handle_inode_event fs/notify/fsnotify.c:282 [inline]
fsnotify_handle_event fs/notify/fsnotify.c:311 [inline]
send_to_group fs/notify/fsnotify.c:385 [inline]
fsnotify+0x1992/0x1fa0 fs/notify/fsnotify.c:591
__fsnotify_parent+0x683/0x820 fs/notify/fsnotify.c:248
fsnotify_parent include/linux/fsnotify.h:77 [inline]
fsnotify_dentry include/linux/fsnotify.h:89 [inline]
fsnotify_change+0x210/0x280 include/linux/fsnotify.h:410
notify_change+0xd7d/0x1030 fs/attr.c:504
vfs_utimes+0x416/0x5b0 fs/utimes.c:65
page_owner free stack trace missing
Memory state around the buggy address:
ffff888115995a80: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
ffff888115995b00: 00 00 00 00 00 00 00 02 fc fc fc fc fc fc fc fc
>ffff888115995b80: 00 00 00 00 00 fc fc fc fc fc fc fc fc fc fc fc
^
ffff888115995c00: 00 00 00 00 00 00 00 07 fc fc fc fc fc fc fc fc
ffff888115995c80: 00 00 00 00 00 00 00 03 fc fc fc fc fc fc fc fc
==================================================================
----------------
Code disassembly (best guess):
0: ff 00 incl (%rax)
2: 74 11 je 0x15
4: 81 fa 00 01 00 00 cmp $0x100,%edx
a: 75 35 jne 0x41
c: 83 b9 6c 0b 00 00 00 cmpl $0x0,0xb6c(%rcx)
13: 74 2c je 0x41
15: 8b 91 48 0b 00 00 mov 0xb48(%rcx),%edx
1b: 83 fa 02 cmp $0x2,%edx
1e: 75 21 jne 0x41
20: 48 8b 91 50 0b 00 00 mov 0xb50(%rcx),%rdx
27: 48 8b 32 mov (%rdx),%rsi
* 2a: 48 8d 7e 01 lea 0x1(%rsi),%rdi <-- trapping instruction
2e: 8b 89 4c 0b 00 00 mov 0xb4c(%rcx),%ecx
34: 48 39 cf cmp %rcx,%rdi
37: 73 08 jae 0x41
39: 48 89 3a mov %rdi,(%rdx)
3c: 48 rex.W
3d: 89 .byte 0x89
3e: 44 rex.R
3f: f2 repnz