================================================================== BUG: KASAN: slab-out-of-bounds in __bpf_get_stackid+0x6fa/0x960 kernel/bpf/stackmap.c:274 Write of size 88 at addr ffff88811aea6690 by task syz.2.442/1940 CPU: 0 PID: 1940 Comm: syz.2.442 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/16/2026 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_9f7ee0cc743aa62b+0x21/0x36 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:should_fail_ex+0x156/0x510 lib/fault-inject.c:108 Code: 3c 24 eb 4b 65 4c 8b 25 f8 32 76 7d 49 81 c4 0c 0b 00 00 4c 89 e3 48 c1 eb 03 0f b6 04 13 84 c0 0f 85 93 02 00 00 45 8b 2c 24 <45> 85 ed 0f 84 d7 fe ff ff 41 ff cd 0f b6 04 13 84 c0 0f 85 b9 02 RSP: 0018:ffffc9000db4f9f8 EFLAGS: 00000246 RAX: 0000000000000000 RBX: 1ffff11023c5fe09 RCX: ffff88811e2fe540 RDX: dffffc0000000000 RSI: 0000000000000001 RDI: ffffffff871ce640 RBP: ffffc9000db4fa40 R08: ffffc9000db4fbf7 R09: ffffc9000db4fbe0 R10: dffffc0000000000 R11: fffff52001b69f7f R12: ffff88811e2ff04c R13: 0000000000000000 R14: ffffffff871ce640 R15: 0000000000000001 should_fail+0xb/0x10 lib/fault-inject.c:157 should_fail_futex kernel/futex/core.c:83 [inline] get_futex_key+0x143/0xb10 kernel/futex/core.c:241 futex_wake+0x150/0x8e0 kernel/futex/waitwake.c:156 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: 0033:0x7f3a4df9de99 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:00007f3a4ee210e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: ffffffffffffffda RBX: 00007f3a4e225fa8 RCX: 00007f3a4df9de99 RDX: 00000000000f4240 RSI: 0000000000000081 RDI: 00007f3a4e225fac RBP: 00007f3a4e225fa0 R08: 000bef2de0a1cb44 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f3a4e226038 R14: 00007ffd03daf8d0 R15: 00007ffd03daf9b8 Allocated by task 1940: 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 ffff88811aea6680 which belongs to the cache kmalloc-64 of size 64 The buggy address is located 16 bytes inside of 64-byte region [ffff88811aea6680, ffff88811aea66c0) The buggy address belongs to the physical page: page:ffffea00046ba980 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x11aea6 flags: 0x4000000000000200(slab|zone=1) raw: 4000000000000200 ffffea0004c2c300 dead000000000002 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 117, tgid 117 (udevd), ts 4672417680, 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_node_track_caller+0xa1/0x1e0 mm/slab_common.c:958 kstrdup+0x3b/0x80 mm/util.c:66 security_context_to_sid_core+0x15b/0x600 security/selinux/ss/services.c:1560 security_context_to_sid_force+0x38/0x50 security/selinux/ss/services.c:1656 selinux_inode_post_setxattr+0x112/0x490 security/selinux/hooks.c:3299 security_inode_post_setxattr+0xd8/0x130 security/security.c:1395 __vfs_setxattr_noperm+0x493/0x5e0 fs/xattr.c:220 page_owner free stack trace missing Memory state around the buggy address: ffff88811aea6580: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ffff88811aea6600: 00 00 00 00 00 00 00 03 fc fc fc fc fc fc fc fc >ffff88811aea6680: 00 00 00 00 00 fc fc fc fc fc fc fc fc fc fc fc ^ ffff88811aea6700: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ffff88811aea6780: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ================================================================== ---------------- Code disassembly (best guess): 0: 3c 24 cmp $0x24,%al 2: eb 4b jmp 0x4f 4: 65 4c 8b 25 f8 32 76 mov %gs:0x7d7632f8(%rip),%r12 # 0x7d763304 b: 7d c: 49 81 c4 0c 0b 00 00 add $0xb0c,%r12 13: 4c 89 e3 mov %r12,%rbx 16: 48 c1 eb 03 shr $0x3,%rbx 1a: 0f b6 04 13 movzbl (%rbx,%rdx,1),%eax 1e: 84 c0 test %al,%al 20: 0f 85 93 02 00 00 jne 0x2b9 26: 45 8b 2c 24 mov (%r12),%r13d * 2a: 45 85 ed test %r13d,%r13d <-- trapping instruction 2d: 0f 84 d7 fe ff ff je 0xffffff0a 33: 41 ff cd dec %r13d 36: 0f b6 04 13 movzbl (%rbx,%rdx,1),%eax 3a: 84 c0 test %al,%al 3c: 0f .byte 0xf 3d: 85 .byte 0x85 3e: b9 .byte 0xb9 3f: 02 .byte 0x2