================================================================== BUG: KASAN: slab-out-of-bounds in __bpf_get_stackid+0x6fa/0x960 kernel/bpf/stackmap.c:274 Write of size 24 at addr ffff88811e845aa8 by task syz.5.9797/8582 CPU: 0 PID: 8582 Comm: syz.5.9797 Tainted: G W syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/15/2026 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:377 [inline] bpf_get_stackid_pe+0x350/0x400 kernel/bpf/stackmap.c:334 bpf_prog_7c99200ca08d4ddc+0x2b/0x40 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:1689 [inline] __hrtimer_run_queues+0x398/0x8a0 kernel/time/hrtimer.c:1753 hrtimer_interrupt+0x3ad/0x8c0 kernel/time/hrtimer.c:1815 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:mtree_range_walk lib/maple_tree.c:2852 [inline] RIP: 0010:mas_state_walk+0x50e/0xa80 lib/maple_tree.c:3778 Code: fc 48 b9 00 00 00 00 00 fc ff df 48 8b 1b 48 8b 45 88 80 3c 08 00 4c 8b 75 90 74 08 4c 89 f7 e8 58 d7 c7 fc 4d 8b 36 48 89 df <4c> 89 f6 e8 aa 3b 82 fc 4c 39 f3 73 78 4c 89 a5 60 ff ff ff 41 0f RSP: 0000:ffffc90004477c60 EFLAGS: 00000246 RAX: 1ffff9200088efb5 RBX: 00007fafb55d7fff RCX: dffffc0000000000 RDX: 0000000000000002 RSI: ffff88811c6e6d00 RDI: 00007fafb55d7fff RBP: ffffc90004477d10 R08: ffff88812ee43cc0 R09: 0000000000000003 R10: 0000000000000003 R11: 0000000000000002 R12: 0000000000000003 R13: ffff88811a3faa1c R14: 00007fafb6e26028 R15: 0000000000000003 mas_walk+0xa9/0x250 lib/maple_tree.c:4935 lock_vma_under_rcu+0xda/0x4f0 mm/memory.c:5620 do_user_addr_fault+0x2fc/0x1030 arch/x86/mm/fault.c:1313 handle_page_fault arch/x86/mm/fault.c:1464 [inline] exc_page_fault+0x51/0xb0 arch/x86/mm/fault.c:1517 asm_exc_page_fault+0x27/0x30 arch/x86/include/asm/idtentry.h:608 RIP: 0033:0x7fafb6a6571d Code: 78 5b 5d 41 5c 41 5e c3 0f 1f 44 00 00 48 8b 44 24 20 48 8b 5c 24 08 48 8b b0 88 00 00 00 8b 78 08 48 8d 53 30 e8 b3 32 ff ff <48> 89 83 88 00 00 00 e9 eb fd ff ff 0f 1f 80 00 00 00 00 8b 7c 24 RSP: 002b:00007fafb79a0050 EFLAGS: 00010206 RAX: 0000000000000000 RBX: 00007fafb6e25fa0 RCX: 00007fafb6c37b70 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000007 RBP: 00007fafb6c37b70 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fafb6e26038 R14: 00007fafb6e25fa0 R15: 00007ffc42f746a8 Allocated by task 8582: 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 Last potentially related work creation: kasan_save_stack+0x3a/0x60 mm/kasan/common.c:46 __kasan_record_aux_stack+0xb6/0xc0 mm/kasan/generic.c:486 kasan_record_aux_stack_noalloc+0xb/0x10 mm/kasan/generic.c:496 __call_rcu_common kernel/rcu/tree.c:2807 [inline] call_rcu+0xcf/0xf50 kernel/rcu/tree.c:2926 nf_hook_entries_free net/netfilter/core.c:94 [inline] __nf_unregister_net_hook+0x486/0x610 net/netfilter/core.c:520 nf_unregister_net_hook net/netfilter/core.c:-1 [inline] nf_unregister_net_hooks+0xe2/0x150 net/netfilter/core.c:607 selinux_nf_unregister+0x21/0x30 security/selinux/hooks.c:7499 ops_exit_list net/core/net_namespace.c:172 [inline] cleanup_net+0x5b0/0xb10 net/core/net_namespace.c:604 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 Second to last potentially related work creation: kasan_save_stack+0x3a/0x60 mm/kasan/common.c:46 __kasan_record_aux_stack+0xb6/0xc0 mm/kasan/generic.c:486 kasan_record_aux_stack_noalloc+0xb/0x10 mm/kasan/generic.c:496 kvfree_call_rcu+0x8b/0x7a0 kernel/rcu/tree.c:3445 ip6addrlbl_net_exit+0x10f/0x180 net/ipv6/addrlabel.c:347 ops_exit_list net/core/net_namespace.c:172 [inline] cleanup_net+0x5b0/0xb10 net/core/net_namespace.c:604 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 The buggy address belongs to the object at ffff88811e845a80 which belongs to the cache kmalloc-64 of size 64 The buggy address is located 40 bytes inside of 64-byte region [ffff88811e845a80, ffff88811e845ac0) The buggy address belongs to the physical page: page:ffffea00047a1140 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x11e845 flags: 0x4000000000000200(slab|zone=1) raw: 4000000000000200 0000000000000000 dead000000000001 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 0x12cc0(GFP_KERNEL|__GFP_NOWARN|__GFP_NORETRY), pid 202, tgid 202 (dhcpcd), ts 10781747382, free_ts 10177770610 set_page_owner include/linux/page_owner.h:33 [inline] post_alloc_hook+0x1f5/0x210 mm/page_alloc.c:2673 prep_new_page+0x1c/0x110 mm/page_alloc.c:2680 get_page_from_freelist+0x2ca9/0x2d20 mm/page_alloc.c:4587 __alloc_pages+0x1fa/0x610 mm/page_alloc.c:5931 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 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:505 [inline] dma_buf_begin_new_exec+0x91/0xd60 drivers/dma-buf/dma-buf.c:727 begin_new_exec+0x5c7/0x1cb0 fs/exec.c:1295 load_elf_binary+0x9e7/0x2820 fs/binfmt_elf.c:1028 search_binary_handler fs/exec.c:1768 [inline] exec_binprm fs/exec.c:1809 [inline] bprm_execve+0x782/0x1390 fs/exec.c:1878 do_execveat_common+0x8e3/0xaa0 fs/exec.c:1983 do_execve fs/exec.c:2057 [inline] __do_sys_execve fs/exec.c:2133 [inline] __se_sys_execve fs/exec.c:2128 [inline] __x64_sys_execve+0x92/0xb0 fs/exec.c:2128 page last free stack trace: reset_page_owner include/linux/page_owner.h:26 [inline] free_pages_prepare mm/page_alloc.c:1581 [inline] free_pcp_prepare mm/page_alloc.c:1655 [inline] free_unref_page_prepare+0x81b/0x820 mm/page_alloc.c:3622 free_unref_page+0x93/0x530 mm/page_alloc.c:3720 free_the_page mm/page_alloc.c:863 [inline] __free_pages+0x67/0x100 mm/page_alloc.c:6021 __free_slab+0xc7/0x1a0 mm/slub.c:2044 rcu_free_slab+0x14/0x20 mm/slub.c:2051 rcu_do_batch+0x52b/0xc30 kernel/rcu/tree.c:2297 rcu_core+0x486/0xf00 kernel/rcu/tree.c:2557 rcu_core_si+0x9/0x10 kernel/rcu/tree.c:2574 handle_softirqs+0x1dd/0x5f0 kernel/softirq.c:642 __do_softirq kernel/softirq.c:680 [inline] invoke_softirq kernel/softirq.c:497 [inline] __irq_exit_rcu+0x52/0xf0 kernel/softirq.c:729 irq_exit_rcu+0x9/0x10 kernel/softirq.c:741 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1118 [inline] sysvec_apic_timer_interrupt+0xa9/0xc0 arch/x86/kernel/apic/apic.c:1118 asm_sysvec_apic_timer_interrupt+0x1b/0x20 arch/x86/include/asm/idtentry.h:691 Memory state around the buggy address: ffff88811e845980: 00 00 00 00 00 00 00 03 fc fc fc fc fc fc fc fc ffff88811e845a00: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc >ffff88811e845a80: 00 00 00 00 00 00 fc fc fc fc fc fc fc fc fc fc ^ ffff88811e845b00: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc ffff88811e845b80: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ================================================================== ---------------- Code disassembly (best guess): 0: fc cld 1: 48 b9 00 00 00 00 00 movabs $0xdffffc0000000000,%rcx 8: fc ff df b: 48 8b 1b mov (%rbx),%rbx e: 48 8b 45 88 mov -0x78(%rbp),%rax 12: 80 3c 08 00 cmpb $0x0,(%rax,%rcx,1) 16: 4c 8b 75 90 mov -0x70(%rbp),%r14 1a: 74 08 je 0x24 1c: 4c 89 f7 mov %r14,%rdi 1f: e8 58 d7 c7 fc call 0xfcc7d77c 24: 4d 8b 36 mov (%r14),%r14 27: 48 89 df mov %rbx,%rdi * 2a: 4c 89 f6 mov %r14,%rsi <-- trapping instruction 2d: e8 aa 3b 82 fc call 0xfc823bdc 32: 4c 39 f3 cmp %r14,%rbx 35: 73 78 jae 0xaf 37: 4c 89 a5 60 ff ff ff mov %r12,-0xa0(%rbp) 3e: 41 rex.B 3f: 0f .byte 0xf