==================================================================
BUG: KASAN: slab-out-of-bounds in __bpf_get_stackid+0x6fa/0x960 kernel/bpf/stackmap.c:274
Write of size 56 at addr ffff888143c47a10 by task syz.1.350/1530
CPU: 0 PID: 1530 Comm: syz.1.350 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_85382e2af238f278+0x21/0x34
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:exit_to_user_mode_loop+0x4a/0xb0 kernel/entry/common.c:164
Code: 00 e8 ba ca 5a 00 e8 d5 6c f8 00 fa e8 1f 3d 9b 03 65 48 8b 05 47 52 a2 7e 4c 8b 30 41 f7 c6 0e 30 02 00 74 5b fb 41 f6 c6 08 <74> 05 e8 ff 80 a0 03 41 f7 c6 00 10 00 00 74 08 48 89 df e8 be 9e
RSP: 0000:ffffc9000fee7ed0 EFLAGS: 00000246
RAX: 0000000000000000 RBX: ffffc9000fee7f58 RCX: 7c451e8b0c852e00
RDX: 1ffffffff0f6e600 RSI: 0000000000000004 RDI: ffffc9000fee7f58
RBP: ffffc9000fee7ee0 R08: ffffffff87b73008 R09: ffffffff87b73018
R10: ffffffff87b73003 R11: 1ffffffff0f6e600 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000004 R15: ffff8881122e5100
exit_to_user_mode_prepare+0x87/0xd0 kernel/entry/common.c:210
irqentry_exit_to_user_mode+0x9/0x10 kernel/entry/common.c:316
irqentry_exit+0x12/0x40 kernel/entry/common.c:419
sysvec_irq_work+0x61/0xc0 arch/x86/kernel/irq_work.c:17
asm_sysvec_irq_work+0x1b/0x20 arch/x86/include/asm/idtentry.h:728
RIP: 0033:0x7f4d9a39cdd9
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:00007f4d9b1b6028 EFLAGS: 00000246
RAX: 0000000000000000 RBX: 00007f4d9a616180 RCX: 00007f4d9a39cdd9
RDX: 0000000000000009 RSI: 0000000040042408 RDI: 000000000000000a
RBP: 00007f4d9a432d69 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f4d9a616218 R14: 00007f4d9a616180 R15: 00007fffa032e488
Allocated by task 1527:
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 ffff888143c47a00
which belongs to the cache kmalloc-64 of size 64
The buggy address is located 16 bytes inside of
64-byte region [ffff888143c47a00, ffff888143c47a40)
The buggy address belongs to the physical page:
page:ffffea00050f11c0 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x143c47
flags: 0x4000000000000200(slab|zone=1)
raw: 4000000000000200 dead000000000100 dead000000000122 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 0x112cc0(GFP_USER|__GFP_NOWARN|__GFP_NORETRY), pid 639, tgid 639 (udevd), ts 35908970098, free_ts 35902840412
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
__do_kmalloc_node mm/slab_common.c:937 [inline]
__kmalloc_node+0xa1/0x1e0 mm/slab_common.c:945
kmalloc_node include/linux/slab.h:589 [inline]
kvmalloc_node+0x28a/0x460 mm/util.c:592
kvmalloc include/linux/slab.h:716 [inline]
simple_xattr_alloc+0x43/0xa0 fs/xattr.c:1008
shmem_initxattrs+0x8d/0x1e0 mm/shmem.c:3294
security_inode_init_security+0x2a9/0x3d0 security/security.c:1134
shmem_symlink+0xd0/0x4c0 mm/shmem.c:3166
vfs_symlink+0x261/0x3f0 fs/namei.c:4478
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+0x95/0x540 mm/page_alloc.c:3718
free_the_page mm/page_alloc.c:863 [inline]
__free_pages+0x67/0x100 mm/page_alloc.c:6016
free_pages+0x82/0x90 mm/page_alloc.c:6027
_pgd_free arch/x86/mm/pgtable.c:420 [inline]
pgd_free+0x187/0x1a0 arch/x86/mm/pgtable.c:476
mm_free_pgd kernel/fork.c:834 [inline]
__mmdrop+0xad/0x600 kernel/fork.c:885
mmdrop include/linux/sched/mm.h:50 [inline]
mmdrop_sched include/linux/sched/mm.h:78 [inline]
finish_task_switch+0x2c9/0x7b0 kernel/sched/core.c:5327
context_switch kernel/sched/core.c:5428 [inline]
__schedule+0xbae/0x1500 kernel/sched/core.c:6755
schedule+0xbd/0x170 kernel/sched/core.c:6831
schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:6890
__mutex_lock_common kernel/locking/mutex.c:704 [inline]
__mutex_lock+0x82f/0x1790 kernel/locking/mutex.c:775
__mutex_lock_slowpath+0xe/0x10 kernel/locking/mutex.c:1064
mutex_lock+0x10a/0x1b0 kernel/locking/mutex.c:296
perf_trace_destroy+0x2b/0x180 kernel/trace/trace_event_perf.c:239
tp_perf_event_destroy+0x15/0x20 kernel/events/core.c:10055
_free_event+0x9cd/0xce0 kernel/events/core.c:5045
Memory state around the buggy address:
ffff888143c47900: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
ffff888143c47980: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
>ffff888143c47a00: 00 00 00 00 00 fc fc fc fc fc fc fc fc fc fc fc
^
ffff888143c47a80: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
ffff888143c47b00: 00 00 00 00 00 00 00 03 fc fc fc fc fc fc fc fc
==================================================================
----------------
Code disassembly (best guess):
0: 00 e8 add %ch,%al
2: ba ca 5a 00 e8 mov $0xe8005aca,%edx
7: d5 6c f8 {rex2 0x6c} clc
a: 00 fa add %bh,%dl
c: e8 1f 3d 9b 03 call 0x39b3d30
11: 65 48 8b 05 47 52 a2 mov %gs:0x7ea25247(%rip),%rax # 0x7ea25260
18: 7e
19: 4c 8b 30 mov (%rax),%r14
1c: 41 f7 c6 0e 30 02 00 test $0x2300e,%r14d
23: 74 5b je 0x80
25: fb sti
26: 41 f6 c6 08 test $0x8,%r14b
* 2a: 74 05 je 0x31 <-- trapping instruction
2c: e8 ff 80 a0 03 call 0x3a08130
31: 41 f7 c6 00 10 00 00 test $0x1000,%r14d
38: 74 08 je 0x42
3a: 48 89 df mov %rbx,%rdi
3d: e8 .byte 0xe8
3e: be .byte 0xbe
3f: 9e sahf