================================================================== BUG: KASAN: slab-out-of-bounds in __bpf_get_stackid+0x6fa/0x960 kernel/bpf/stackmap.c:274 Write of size 56 at addr ffff88811ed57190 by task syz.0.920/3742 CPU: 0 PID: 3742 Comm: syz.0.920 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_a448e89f4c9ad9d1+0x28/0x42 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+0x3c7/0x5e0 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:_perf_ioctl kernel/events/core.c:5778 [inline] RIP: 0010:perf_ioctl+0x8d9/0x1e70 kernel/events/core.c:5837 Code: 84 35 0b 00 00 e8 37 72 d7 ff e9 d0 fe ff ff e8 2d 72 d7 ff 0f 0b e9 11 ff ff ff 48 89 df 4c 89 fe 31 d2 e8 09 dc fd ff 89 c3 <31> ff 89 c6 e8 2e 76 d7 ff 85 db 0f 84 2e 0c 00 00 e8 01 72 d7 ff RSP: 0018:ffffc90000a47be0 EFLAGS: 00000282 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000080000 RDX: ffffc90001acb000 RSI: 000000000000002a RDI: ffff88811caa4400 RBP: ffffc90000a47e80 R08: ffff88812595a7bf R09: 1ffff11024b2b4f7 R10: dffffc0000000000 R11: ffffed1024b2b4f8 R12: 0000000040042408 R13: dffffc0000000000 R14: fffff52000148f8c R15: ffffc90000aeb000 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:870 [inline] __se_sys_ioctl+0x12f/0x1b0 fs/ioctl.c:856 __x64_sys_ioctl+0x7b/0x90 fs/ioctl.c:856 x64_sys_call+0x58b/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:17 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: 0033:0x7ff42479e0d9 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:00007ff42573c028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007ff424a26090 RCX: 00007ff42479e0d9 RDX: 0000000000000008 RSI: 0000000040042408 RDI: 0000000000000009 RBP: 00007ff424835024 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ff424a26128 R14: 00007ff424a26090 R15: 00007ffdedd0d278 Allocated by task 3736: 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 ffff88811ed57180 which belongs to the cache kmalloc-64 of size 64 The buggy address is located 16 bytes inside of 64-byte region [ffff88811ed57180, ffff88811ed571c0) The buggy address belongs to the physical page: page:ffffea00047b55c0 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x11ed57 flags: 0x4000000000000200(slab|zone=1) raw: 4000000000000200 ffffea000456f240 dead000000000003 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 1832, tgid 1831 (syz.0.419), ts 55925246658, free_ts 55825859371 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_uevent+0x1d/0x30 lib/kobject_uevent.c:657 rx_queue_add_kobject net/core/net-sysfs.c:1068 [inline] net_rx_queue_update_kobjects+0x223/0x470 net/core/net-sysfs.c:1108 register_queue_kobjects net/core/net-sysfs.c:1768 [inline] netdev_register_kobject+0x23d/0x330 net/core/net-sysfs.c:2013 register_netdevice+0xec9/0x1550 net/core/dev.c:10206 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+0x80c/0x820 mm/page_alloc.c:3621 free_unref_page+0x93/0x530 mm/page_alloc.c:3719 free_the_page mm/page_alloc.c:863 [inline] __free_pages+0x67/0x100 mm/page_alloc.c:6020 bpf_ringbuf_free kernel/bpf/ringbuf.c:231 [inline] ringbuf_map_free+0xbf/0x110 kernel/bpf/ringbuf.c:240 bpf_map_free_deferred+0x104/0x1c0 kernel/bpf/syscall.c:637 process_one_work+0x717/0xc30 kernel/workqueue.c:2302 worker_thread+0xa4d/0x11d0 kernel/workqueue.c:2449 kthread+0x281/0x320 kernel/kthread.c:386 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 Memory state around the buggy address: ffff88811ed57080: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ffff88811ed57100: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc >ffff88811ed57180: 00 00 00 00 00 fc fc fc fc fc fc fc fc fc fc fc ^ ffff88811ed57200: 00 00 00 00 00 00 00 03 fc fc fc fc fc fc fc fc ffff88811ed57280: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ================================================================== ---------------- Code disassembly (best guess), 3 bytes skipped: 0: 00 00 add %al,(%rax) 2: e8 37 72 d7 ff call 0xffd7723e 7: e9 d0 fe ff ff jmp 0xfffffedc c: e8 2d 72 d7 ff call 0xffd7723e 11: 0f 0b ud2 13: e9 11 ff ff ff jmp 0xffffff29 18: 48 89 df mov %rbx,%rdi 1b: 4c 89 fe mov %r15,%rsi 1e: 31 d2 xor %edx,%edx 20: e8 09 dc fd ff call 0xfffddc2e 25: 89 c3 mov %eax,%ebx * 27: 31 ff xor %edi,%edi <-- trapping instruction 29: 89 c6 mov %eax,%esi 2b: e8 2e 76 d7 ff call 0xffd7765e 30: 85 db test %ebx,%ebx 32: 0f 84 2e 0c 00 00 je 0xc66 38: e8 01 72 d7 ff call 0xffd7723e