================================================================== BUG: KASAN: slab-out-of-bounds in __bpf_get_stackid+0x6fa/0x960 kernel/bpf/stackmap.c:274 Write of size 72 at addr ffff888114b06690 by task syz.3.387/1856 CPU: 0 PID: 1856 Comm: syz.3.387 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026 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_b8aad64816793362+0x21/0x3a 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:memset_erms+0xb/0x10 arch/x86/lib/memset_64.S:65 Code: 03 40 0f b6 f6 48 b8 01 01 01 01 01 01 01 01 48 0f af c6 f3 48 ab 89 d1 f3 aa 4c 89 c8 c3 90 49 89 f9 40 88 f0 48 89 d1 f3 aa <4c> 89 c8 c3 90 49 89 fa 40 0f b6 ce 48 b8 01 01 01 01 01 01 01 01 RSP: 0018:ffffc9000152fb30 EFLAGS: 00000202 RAX: ffffffff8167a700 RBX: 0000000000000018 RCX: 0000000000000000 RDX: 0000000000000018 RSI: 0000000000000000 RDI: ffffc9000152fbf8 RBP: ffffc9000152fb50 R08: ffffc9000152fbf7 R09: ffffc9000152fbe0 R10: dffffc0000000000 R11: fffff520002a5f7f R12: 00007f255b425fac R13: 1ffff920002a5f78 R14: 0000000000000000 R15: ffffc9000152fbe0 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: 0033:0x7f255b19e0d9 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:00007f255c0040e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: ffffffffffffffda RBX: 00007f255b425fa8 RCX: 00007f255b19e0d9 RDX: 00000000000f4240 RSI: 0000000000000081 RDI: 00007f255b425fac RBP: 00007f255b425fa0 R08: 0036f507bdb67fcb R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f255b426038 R14: 00007ffec6d49fe0 R15: 00007ffec6d4a0c8 Allocated by task 1856: 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 ffff888114b06680 which belongs to the cache kmalloc-64 of size 64 The buggy address is located 16 bytes inside of 64-byte region [ffff888114b06680, ffff888114b066c0) The buggy address belongs to the physical page: page:ffffea000452c180 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x114b06 flags: 0x4000000000000200(slab|zone=1) raw: 4000000000000200 ffffea0004cb7e00 dead000000000003 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 0x12cc0(GFP_KERNEL|__GFP_NOWARN|__GFP_NORETRY), pid 112, tgid 112 (udevadm), ts 4508707991, 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] kzalloc include/linux/slab.h:699 [inline] kobject_get_path+0xbf/0x200 lib/kobject.c:152 kobject_uevent_env+0x29f/0x720 lib/kobject_uevent.c:544 kobject_synth_uevent+0x457/0x940 lib/kobject_uevent.c:208 uevent_store+0x25/0x70 drivers/base/core.c:2690 dev_attr_store+0x6c/0x90 drivers/base/core.c:2389 sysfs_kf_write+0x137/0x150 fs/sysfs/file.c:136 page_owner free stack trace missing Memory state around the buggy address: ffff888114b06580: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc ffff888114b06600: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc >ffff888114b06680: 00 00 00 00 00 fc fc fc fc fc fc fc fc fc fc fc ^ ffff888114b06700: 00 00 00 00 00 00 fc fc fc fc fc fc fc fc fc fc ffff888114b06780: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ================================================================== ---------------- Code disassembly (best guess): 0: 03 40 0f add 0xf(%rax),%eax 3: b6 f6 mov $0xf6,%dh 5: 48 b8 01 01 01 01 01 movabs $0x101010101010101,%rax c: 01 01 01 f: 48 0f af c6 imul %rsi,%rax 13: f3 48 ab rep stos %rax,%es:(%rdi) 16: 89 d1 mov %edx,%ecx 18: f3 aa rep stos %al,%es:(%rdi) 1a: 4c 89 c8 mov %r9,%rax 1d: c3 ret 1e: 90 nop 1f: 49 89 f9 mov %rdi,%r9 22: 40 88 f0 mov %sil,%al 25: 48 89 d1 mov %rdx,%rcx 28: f3 aa rep stos %al,%es:(%rdi) * 2a: 4c 89 c8 mov %r9,%rax <-- trapping instruction 2d: c3 ret 2e: 90 nop 2f: 49 89 fa mov %rdi,%r10 32: 40 0f b6 ce movzbl %sil,%ecx 36: 48 b8 01 01 01 01 01 movabs $0x101010101010101,%rax 3d: 01 01 01