================================================================== BUG: KASAN: slab-out-of-bounds in __bpf_get_stackid+0x6fa/0x960 kernel/bpf/stackmap.c:274 Write of size 96 at addr ffff8881192e1c10 by task syz.4.164/953 CPU: 1 PID: 953 Comm: syz.4.164 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026 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_fa73c8c086b491e8+0x21/0x31 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+0x51f/0x5e0 kernel/events/core.c:10238 __perf_event_overflow+0x437/0x620 kernel/events/core.c:9448 perf_swevent_hrtimer+0x400/0x5b0 kernel/events/core.c:10879 __run_hrtimer kernel/time/hrtimer.c:1685 [inline] __hrtimer_run_queues+0x3d5/0xa00 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:__should_failslab+0x97/0xf0 mm/failslab.c:44 Code: 48 c1 e8 03 42 0f b6 04 20 84 c0 75 52 41 f6 47 03 02 74 d8 c1 eb 0d 83 e3 01 49 83 c6 1c 4c 89 f0 48 c1 e8 03 42 0f b6 04 20 <84> c0 75 1a 41 8b 36 48 c7 c7 40 2f 27 87 89 da e8 f4 85 d4 00 5b RSP: 0018:ffffc9000ff67988 EFLAGS: 00000a07 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000080000 RDX: ffffc90002db0000 RSI: 0000000000000cc0 RDI: ffff8881001eb980 RBP: ffffc9000ff679a8 R08: 0000000000000003 R09: 0000000000000004 R10: dffffc0000000000 R11: fffff52001fecf36 R12: dffffc0000000000 R13: ffffffff814ac804 R14: ffff8881001eb99c R15: ffff8881001eb980 should_failslab+0x9/0x20 mm/slab_common.c:1445 slab_pre_alloc_hook mm/slab.h:743 [inline] slab_alloc_node mm/slub.c:3302 [inline] slab_alloc mm/slub.c:3392 [inline] __kmem_cache_alloc_lru mm/slub.c:3399 [inline] kmem_cache_alloc+0x3b/0x330 mm/slub.c:3408 create_nsproxy kernel/nsproxy.c:56 [inline] create_new_namespaces+0x34/0x660 kernel/nsproxy.c:74 copy_namespaces+0x1d1/0x220 kernel/nsproxy.c:178 copy_process+0x1303/0x3510 kernel/fork.c:2478 kernel_clone+0x22f/0x820 kernel/fork.c:2890 __do_sys_clone kernel/fork.c:3033 [inline] __se_sys_clone kernel/fork.c:3017 [inline] __x64_sys_clone+0x193/0x200 kernel/fork.c:3017 x64_sys_call+0x990/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:57 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: 0033:0x7fe117f9c629 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:00007fe118d70fd8 EFLAGS: 00000206 ORIG_RAX: 0000000000000038 RAX: ffffffffffffffda RBX: 00007fe118215fa0 RCX: 00007fe117f9c629 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000022023400 RBP: 00007fe118032b39 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000 R13: 00007fe118216038 R14: 00007fe118215fa0 R15: 00007ffc10b91958 Allocated by task 953: 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:4987 __do_sys_bpf kernel/bpf/syscall.c:5109 [inline] __se_sys_bpf kernel/bpf/syscall.c:5107 [inline] __x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:5107 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 ffff8881192e1c00 which belongs to the cache kmalloc-64 of size 64 The buggy address is located 16 bytes inside of 64-byte region [ffff8881192e1c00, ffff8881192e1c40) The buggy address belongs to the physical page: page:ffffea000464b840 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1192e1 flags: 0x4000000000000200(slab|zone=1) raw: 4000000000000200 0000000000000000 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 935, tgid 934 (syz.1.159), ts 52161276860, free_ts 48719562177 set_page_owner include/linux/page_owner.h:33 [inline] post_alloc_hook+0x1f5/0x210 mm/page_alloc.c:2643 prep_new_page+0x1c/0x110 mm/page_alloc.c:2650 get_page_from_freelist+0x2d12/0x2d80 mm/page_alloc.c:4554 __alloc_pages+0x1d9/0x480 mm/page_alloc.c:5868 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_track_caller+0xa0/0x1e0 mm/slab_common.c:958 __do_krealloc mm/slab_common.c:1341 [inline] krealloc+0x6f/0x110 mm/slab_common.c:1374 push_jmp_history kernel/bpf/verifier.c:2462 [inline] is_state_visited kernel/bpf/verifier.c:12315 [inline] do_check+0x2d42/0xf070 kernel/bpf/verifier.c:12455 do_check_common+0x11ae/0x1950 kernel/bpf/verifier.c:14934 do_check_main kernel/bpf/verifier.c:14997 [inline] bpf_check+0x3f98/0x10d10 kernel/bpf/verifier.c:15574 bpf_prog_load+0x10f0/0x16a0 kernel/bpf/syscall.c:2624 __sys_bpf+0x57b/0x850 kernel/bpf/syscall.c:5005 page last free stack trace: reset_page_owner include/linux/page_owner.h:26 [inline] free_pages_prepare mm/page_alloc.c:1551 [inline] free_pcp_prepare mm/page_alloc.c:1625 [inline] free_unref_page_prepare+0x742/0x750 mm/page_alloc.c:3589 free_unref_page_list+0x117/0x8c0 mm/page_alloc.c:3740 release_pages+0xaf2/0xb50 mm/swap.c:1048 free_pages_and_swap_cache+0x86/0xa0 mm/swap_state.c:315 tlb_batch_pages_flush mm/mmu_gather.c:59 [inline] tlb_flush_mmu_free mm/mmu_gather.c:254 [inline] tlb_flush_mmu mm/mmu_gather.c:261 [inline] tlb_finish_mmu+0x1aa/0x370 mm/mmu_gather.c:361 exit_mmap+0x412/0xc10 mm/mmap.c:3384 __mmput+0x93/0x360 kernel/fork.c:1309 mmput+0x4b/0x150 kernel/fork.c:1333 exit_mm kernel/exit.c:568 [inline] do_exit+0x994/0x2660 kernel/exit.c:873 do_group_exit+0x210/0x2d0 kernel/exit.c:1028 get_signal+0x13b5/0x1520 kernel/signal.c:2891 arch_do_signal_or_restart+0xd1/0x1140 arch/x86/kernel/signal.c:871 exit_to_user_mode_loop+0x7a/0xb0 kernel/entry/common.c:174 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 Memory state around the buggy address: ffff8881192e1b00: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc ffff8881192e1b80: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc >ffff8881192e1c00: 00 00 00 00 00 fc fc fc fc fc fc fc fc fc fc fc ^ ffff8881192e1c80: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ffff8881192e1d00: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ================================================================== ---------------- Code disassembly (best guess): 0: 48 c1 e8 03 shr $0x3,%rax 4: 42 0f b6 04 20 movzbl (%rax,%r12,1),%eax 9: 84 c0 test %al,%al b: 75 52 jne 0x5f d: 41 f6 47 03 02 testb $0x2,0x3(%r15) 12: 74 d8 je 0xffffffec 14: c1 eb 0d shr $0xd,%ebx 17: 83 e3 01 and $0x1,%ebx 1a: 49 83 c6 1c add $0x1c,%r14 1e: 4c 89 f0 mov %r14,%rax 21: 48 c1 e8 03 shr $0x3,%rax 25: 42 0f b6 04 20 movzbl (%rax,%r12,1),%eax * 2a: 84 c0 test %al,%al <-- trapping instruction 2c: 75 1a jne 0x48 2e: 41 8b 36 mov (%r14),%esi 31: 48 c7 c7 40 2f 27 87 mov $0xffffffff87272f40,%rdi 38: 89 da mov %ebx,%edx 3a: e8 f4 85 d4 00 call 0xd48633 3f: 5b pop %rbx