================================================================== BUG: KASAN: slab-out-of-bounds in __bpf_get_stackid+0x6fa/0x960 kernel/bpf/stackmap.c:274 Write of size 72 at addr ffff88811741f110 by task syz.1.1384/5241 CPU: 0 PID: 5241 Comm: syz.1.1384 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_521f53674c34c38e+0x21/0x34 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_swevent_overflow kernel/events/core.c:9531 [inline] perf_swevent_event+0x243/0x440 kernel/events/core.c:9582 do_perf_sw_event kernel/events/core.c:9695 [inline] ___perf_sw_event+0x3bf/0x500 kernel/events/core.c:9726 __perf_sw_event+0x134/0x270 kernel/events/core.c:9738 perf_sw_event include/linux/perf_event.h:1250 [inline] do_user_addr_fault+0xfe9/0x1030 arch/x86/mm/fault.c:1285 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: 0010:clear_user_erms+0xa/0x10 arch/x86/lib/clear_page_64.S:182 Code: 74 03 f3 48 ab 83 e2 07 74 04 89 d1 f3 aa 31 c0 c3 48 c1 e1 03 83 e2 07 48 01 d1 eb f1 90 90 90 48 83 f9 40 0f 82 76 ff ff ff aa 31 c0 c3 00 90 90 90 90 90 90 90 90 90 90 90 b8 d4 72 ba fd RSP: 0000:ffffc900078bfab8 EFLAGS: 00050246 RAX: 0000000000000000 RBX: ffff888121290000 RCX: 0000000000000040 RDX: 0000000000000000 RSI: 00007f54d3cfcc00 RDI: 00007f54d3cfce00 RBP: ffffc900078bfc90 R08: ffffc900078bfda0 R09: 1ffff11024252000 R10: dffffc0000000000 R11: ffffed1024252001 R12: ffff888121290f90 R13: 00007f54d3cfcc00 R14: dffffc0000000000 R15: 00007f54d3cfcc00 get_sigframe arch/x86/kernel/signal.c:297 [inline] __setup_rt_frame arch/x86/kernel/signal.c:472 [inline] setup_rt_frame arch/x86/kernel/signal.c:784 [inline] handle_signal arch/x86/kernel/signal.c:828 [inline] arch_do_signal_or_restart+0x652/0x11c0 arch/x86/kernel/signal.c:873 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 exc_page_fault+0x5e/0xb0 arch/x86/mm/fault.c:1520 asm_exc_page_fault+0x27/0x30 arch/x86/include/asm/idtentry.h:608 RIP: 0033:0x7f54d2c58390 Code: c0 75 27 69 3d 35 d3 ef 00 b8 0b 00 00 e8 38 66 14 00 31 f6 bf 3c 00 00 00 31 c0 e8 fa 5a 14 00 eb fe 0f 1f 84 00 00 00 00 00 <64> c7 04 25 a4 ff ff ff 00 00 00 00 48 83 c4 38 c3 66 66 2e 0f 1f RSP: 002b:00007f54d3cfcfe0 EFLAGS: 00010206 RAX: 0000000000000405 RBX: 00007f54d3025fa0 RCX: 00007f54d2d9de99 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000082000 RBP: 00007f54d2e33eaf R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000 R13: 00007f54d3026038 R14: 00007f54d3025fa0 R15: 00007ffd472bb548 Allocated by task 5241: 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 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 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 ffff88811741f100 which belongs to the cache kmalloc-64 of size 64 The buggy address is located 16 bytes inside of 64-byte region [ffff88811741f100, ffff88811741f140) The buggy address belongs to the physical page: page:ffffea00045d07c0 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff88811741f980 pfn:0x11741f flags: 0x4000000000000200(slab|zone=1) raw: 4000000000000200 ffffea00043f4c00 dead000000000005 ffff888100042780 raw: ffff88811741f980 000000008020001e 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 311, tgid 311 (udevd), ts 32224016516, free_ts 32220334368 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+0xa2/0x1e0 mm/slab_common.c:945 kmalloc_node include/linux/slab.h:589 [inline] kvmalloc_node+0x28a/0x460 mm/util.c:592 kvmalloc include/linux/slab.h:716 [inline] simple_xattr_alloc fs/xattr.c:1008 [inline] simple_xattr_set+0xbd/0x560 fs/xattr.c:1072 shmem_xattr_handler_set+0x46/0xe0 mm/shmem.c:3337 __vfs_setxattr+0x400/0x450 fs/xattr.c:182 __vfs_setxattr_noperm+0x129/0x5e0 fs/xattr.c:216 __vfs_setxattr_locked+0x20e/0x230 fs/xattr.c:277 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 __free_slab+0xc7/0x1a0 mm/slub.c:2044 free_slab mm/slub.c:2059 [inline] discard_slab+0x29/0x40 mm/slub.c:2065 __slab_free+0x201/0x280 mm/slub.c:3625 do_slab_free mm/slub.c:3666 [inline] ___cache_free+0xbf/0xd0 mm/slub.c:3722 qlink_free mm/kasan/quarantine.c:168 [inline] qlist_free_all+0xc6/0x140 mm/kasan/quarantine.c:187 kasan_quarantine_reduce+0x14a/0x170 mm/kasan/quarantine.c:294 __kasan_slab_alloc+0x24/0x80 mm/kasan/common.c:311 kasan_slab_alloc include/linux/kasan.h:202 [inline] slab_post_alloc_hook+0x4f/0x2d0 mm/slab.h:768 slab_alloc_node mm/slub.c:3382 [inline] slab_alloc mm/slub.c:3392 [inline] __kmem_cache_alloc_lru mm/slub.c:3399 [inline] kmem_cache_alloc+0x166/0x320 mm/slub.c:3408 getname_flags+0xba/0x510 fs/namei.c:139 vfs_fstatat fs/stat.c:266 [inline] __do_sys_newfstatat fs/stat.c:437 [inline] __se_sys_newfstatat+0x127/0x440 fs/stat.c:431 __x64_sys_newfstatat+0x9b/0xb0 fs/stat.c:431 x64_sys_call+0x77c/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:263 Memory state around the buggy address: ffff88811741f000: 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc fc ffff88811741f080: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc >ffff88811741f100: 00 00 00 00 00 fc fc fc fc fc fc fc fc fc fc fc ^ ffff88811741f180: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ffff88811741f200: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ================================================================== ---------------- Code disassembly (best guess): 0: 74 03 je 0x5 2: f3 48 ab rep stos %rax,%es:(%rdi) 5: 83 e2 07 and $0x7,%edx 8: 74 04 je 0xe a: 89 d1 mov %edx,%ecx c: f3 aa rep stos %al,%es:(%rdi) e: 31 c0 xor %eax,%eax 10: c3 ret 11: 48 c1 e1 03 shl $0x3,%rcx 15: 83 e2 07 and $0x7,%edx 18: 48 01 d1 add %rdx,%rcx 1b: eb f1 jmp 0xe 1d: 90 nop 1e: 90 nop 1f: 90 nop 20: 48 83 f9 40 cmp $0x40,%rcx 24: 0f 82 76 ff ff ff jb 0xffffffa0 * 2a: f3 aa rep stos %al,%es:(%rdi) <-- trapping instruction 2c: 31 c0 xor %eax,%eax 2e: c3 ret 2f: 00 90 90 90 90 90 add %dl,-0x6f6f6f70(%rax) 35: 90 nop 36: 90 nop 37: 90 nop 38: 90 nop 39: 90 nop 3a: 90 nop 3b: b8 d4 72 ba fd mov $0xfdba72d4,%eax