================================================================== BUG: KASAN: slab-out-of-bounds in __bpf_get_stackid+0x6fa/0x960 kernel/bpf/stackmap.c:274 Write of size 32 at addr ffff88813b011190 by task syz.4.296/1465 CPU: 1 PID: 1465 Comm: syz.4.296 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2026 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_77d04459b3333dfe+0x21/0x31 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:do_user_addr_fault+0x1cb/0x1030 arch/x86/mm/fault.c:1280 Code: bb 0d 81 00 48 89 5d b8 48 8b 1b 48 89 de 48 83 e6 03 31 ff e8 36 87 3b 00 48 83 e3 03 74 0d e8 6b 82 3b 00 fb bb 54 02 00 00 55 49 8d 9e 90 00 00 00 48 89 d8 48 c1 e8 03 48 b9 00 00 00 00 RSP: 0000:ffffc900009d7e60 EFLAGS: 00000293 RAX: ffffffff8135e7b5 RBX: 0000000000000254 RCX: ffff888112475100 RDX: 0000000000000000 RSI: 0000000000000003 RDI: 0000000000000000 RBP: ffffc900009d7f18 R08: ffffc900009d7fff R09: 1ffff9200013afff R10: dffffc0000000000 R11: fffff5200013b000 R12: 0000000000000007 R13: ffff888120cdcf00 R14: ffffc900009d7f58 R15: ffff888112475660 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: 0033:0x7f6d96c64454 Code: 48 83 ec 08 64 48 89 3c 25 d0 fe ff ff eb 20 0f 1f 80 00 00 00 00 45 31 c0 31 c9 ba 80 00 00 00 48 89 de bf ca 00 00 00 31 c0 e7 9c 13 00 8b 03 85 c0 74 e1 c7 45 08 00 00 00 00 45 84 e4 74 RSP: 002b:00007f6d957f70f0 EFLAGS: 00010246 RAX: 0000000000000000 RBX: 00007f6d97026278 RCX: 0000000000000000 RDX: 0000000000000080 RSI: 00007f6d97026278 RDI: 00000000000000ca RBP: 00007f6d97026270 R08: 0000000000000000 R09: 0000000000000000 R10: 000000000000000a R11: 0000000000000246 R12: 0000000000000000 R13: 00007f6d97026308 R14: 00007ffd5989f8e0 R15: 00007ffd5989f9c8 Allocated by task 1463: 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 ffff88813b011180 which belongs to the cache kmalloc-64 of size 64 The buggy address is located 16 bytes inside of 64-byte region [ffff88813b011180, ffff88813b0111c0) The buggy address belongs to the physical page: page:ffffea0004ec0440 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x13b011 flags: 0x4000000000000200(slab|zone=1) raw: 4000000000000200 0000000000000000 dead000000000122 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 0x112cc0(GFP_USER|__GFP_NOWARN|__GFP_NORETRY), pid 1460, tgid 1460 (syz.4.296), ts 47009553844, free_ts 46985280098 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 __do_kmalloc_node mm/slab_common.c:937 [inline] __kmalloc_node+0xa2/0x1e0 mm/slab_common.c:945 kmalloc_node include/linux/slab.h:589 [inline] __vmalloc_area_node mm/vmalloc.c:3070 [inline] __vmalloc_node_range+0x564/0x1440 mm/vmalloc.c:3256 alloc_thread_stack_node kernel/fork.c:322 [inline] dup_task_struct+0x3ca/0x900 kernel/fork.c:1086 copy_process+0x5e7/0x3500 kernel/fork.c:2315 kernel_clone+0x22f/0x7f0 kernel/fork.c:2903 __do_sys_clone3 kernel/fork.c:3204 [inline] __se_sys_clone3 kernel/fork.c:3188 [inline] __x64_sys_clone3+0x2ce/0x360 kernel/fork.c:3188 x64_sys_call+0x4ce/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:436 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_pages+0x82/0x90 mm/page_alloc.c:6032 kasan_depopulate_vmalloc_pte+0x6b/0x90 mm/kasan/shadow.c:375 apply_to_pte_range mm/memory.c:2690 [inline] apply_to_pmd_range mm/memory.c:2734 [inline] apply_to_pud_range mm/memory.c:2770 [inline] apply_to_p4d_range mm/memory.c:2806 [inline] __apply_to_page_range+0x8db/0xc80 mm/memory.c:2842 apply_to_existing_page_range+0x38/0x50 mm/memory.c:2875 kasan_release_vmalloc+0x97/0xb0 mm/kasan/shadow.c:492 __purge_vmap_area_lazy+0xf09/0x1870 mm/vmalloc.c:1791 drain_vmap_area_work+0x3e/0xd0 mm/vmalloc.c:1820 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: ffff88813b011080: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ffff88813b011100: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc >ffff88813b011180: 00 00 00 00 00 fc fc fc fc fc fc fc fc fc fc fc ^ ffff88813b011200: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88813b011280: 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc fc ================================================================== ---------------- Code disassembly (best guess): 0: bb 0d 81 00 48 mov $0x4800810d,%ebx 5: 89 5d b8 mov %ebx,-0x48(%rbp) 8: 48 8b 1b mov (%rbx),%rbx b: 48 89 de mov %rbx,%rsi e: 48 83 e6 03 and $0x3,%rsi 12: 31 ff xor %edi,%edi 14: e8 36 87 3b 00 call 0x3b874f 19: 48 83 e3 03 and $0x3,%rbx 1d: 74 0d je 0x2c 1f: e8 6b 82 3b 00 call 0x3b828f 24: fb sti 25: bb 54 02 00 00 mov $0x254,%ebx * 2a: eb 55 jmp 0x81 <-- trapping instruction 2c: 49 8d 9e 90 00 00 00 lea 0x90(%r14),%rbx 33: 48 89 d8 mov %rbx,%rax 36: 48 c1 e8 03 shr $0x3,%rax 3a: 48 rex.W 3b: b9 00 00 00 00 mov $0x0,%ecx