================================================================== BUG: KASAN: slab-use-after-free in xsk_bind+0x1582/0x16c0 net/xdp/xsk.c:1761 Read of size 4 at addr ffff88802705998c by task syz.0.4290/19784 CPU: 0 UID: 0 PID: 19784 Comm: syz.0.4290 Tainted: G L syzkaller #0 PREEMPT(full) Tainted: [L]=SOFTLOCKUP Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/05/2026 Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x100/0x190 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:378 [inline] print_report+0x13d/0x4b0 mm/kasan/report.c:482 kasan_report+0xdf/0x1c0 mm/kasan/report.c:595 xsk_bind+0x1582/0x16c0 net/xdp/xsk.c:1761 __sys_bind_socket net/socket.c:1945 [inline] __sys_bind_socket net/socket.c:1937 [inline] __sys_bind+0x1a9/0x260 net/socket.c:1976 __do_sys_bind net/socket.c:1981 [inline] __se_sys_bind net/socket.c:1979 [inline] __x64_sys_bind+0x72/0xb0 net/socket.c:1979 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline] do_syscall_64+0x123/0x790 arch/x86/entry/syscall_64.c:84 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fd09a99e0d9 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:00007fd098b1b028 EFLAGS: 00000246 ORIG_RAX: 0000000000000031 RAX: ffffffffffffffda RBX: 00007fd09ac26090 RCX: 00007fd09a99e0d9 RDX: 0000000000000010 RSI: 00002000000003c0 RDI: 0000000000000004 RBP: 00007fd09aa35024 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fd09ac26128 R14: 00007fd09ac26090 R15: 00007ffddbaeba78 Allocated by task 19510: kasan_save_stack+0x30/0x50 mm/kasan/common.c:57 kasan_save_track+0x14/0x30 mm/kasan/common.c:78 poison_kmalloc_redzone mm/kasan/common.c:398 [inline] __kasan_kmalloc+0xaa/0xb0 mm/kasan/common.c:415 kasan_kmalloc include/linux/kasan.h:263 [inline] __kmalloc_cache_noprof+0x2f8/0x6d0 mm/slub.c:5563 _kmalloc_noprof include/linux/slab.h:991 [inline] _kmalloc_array_noprof include/linux/slab.h:1211 [inline] kvm_arch_vcpu_create+0x365/0xab0 arch/x86/kvm/x86.c:9371 kvm_vm_ioctl_create_vcpu virt/kvm/kvm_main.c:4213 [inline] kvm_vm_ioctl+0x7e3/0x42d0 virt/kvm/kvm_main.c:5178 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:597 [inline] __se_sys_ioctl fs/ioctl.c:583 [inline] __x64_sys_ioctl+0x18e/0x210 fs/ioctl.c:583 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline] do_syscall_64+0x123/0x790 arch/x86/entry/syscall_64.c:84 entry_SYSCALL_64_after_hwframe+0x77/0x7f Freed by task 19508: kasan_save_stack+0x30/0x50 mm/kasan/common.c:57 kasan_save_track+0x14/0x30 mm/kasan/common.c:78 kasan_save_free_info+0x3b/0x70 mm/kasan/generic.c:584 poison_slab_object mm/kasan/common.c:253 [inline] __kasan_slab_free+0x5f/0x80 mm/kasan/common.c:285 kasan_slab_free include/linux/kasan.h:235 [inline] slab_free_hook mm/slub.c:2748 [inline] slab_free mm/slub.c:6499 [inline] kfree+0x22b/0x6d0 mm/slub.c:6792 kvm_arch_vcpu_destroy+0x1e0/0x3e0 arch/x86/kvm/x86.c:9472 kvm_vcpu_destroy virt/kvm/kvm_main.c:469 [inline] kvm_destroy_vcpus+0x24e/0x3c0 virt/kvm/kvm_main.c:489 kvm_arch_destroy_vm+0xc7/0x230 arch/x86/kvm/x86.c:10032 kvm_destroy_vm virt/kvm/kvm_main.c:1295 [inline] kvm_put_kvm+0x556/0xc10 virt/kvm/kvm_main.c:1332 kvm_vm_release+0x3c/0x50 virt/kvm/kvm_main.c:1355 __fput+0x3ff/0xb50 fs/file_table.c:512 task_work_run+0x150/0x240 kernel/task_work.c:233 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline] __exit_to_user_mode_loop kernel/entry/common.c:70 [inline] exit_to_user_mode_loop+0x1d8/0x700 kernel/entry/common.c:101 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:207 [inline] syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:230 [inline] syscall_exit_to_user_mode include/linux/entry-common.h:336 [inline] do_syscall_64+0x661/0x790 arch/x86/entry/syscall_64.c:89 entry_SYSCALL_64_after_hwframe+0x77/0x7f The buggy address belongs to the object at ffff888027059800 which belongs to the cache kmalloc-cg-1k of size 1024 The buggy address is located 396 bytes inside of freed 1024-byte region [ffff888027059800, ffff888027059c00) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff888027059800 pfn:0x27058 head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 memcg:ffff888031ad7d01 flags: 0xfff00000000240(workingset|head|node=0|zone=1|lastcpupid=0x7ff) page_type: f5(slab) raw: 00fff00000000240 ffff88801c037280 ffffea0001e64810 ffffea0001f93a10 raw: ffff888027059800 000000020010000f 00000000f5000000 ffff888031ad7d01 head: 00fff00000000240 ffff88801c037280 ffffea0001e64810 ffffea0001f93a10 head: ffff888027059800 000000020010000f 00000000f5000000 ffff888031ad7d01 head: 00fff00000000003 fffffffffffffe01 00000000ffffffff 00000000ffffffff head: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000008 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 3, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 5596, tgid 5596 (syz-executor), ts 63347764176 set_page_owner include/linux/page_owner.h:33 [inline] post_alloc_hook+0xfd/0x120 mm/page_alloc.c:1871 prep_new_page mm/page_alloc.c:1879 [inline] get_page_from_freelist+0x110d/0x35b0 mm/page_alloc.c:3943 __alloc_frozen_pages_noprof+0x2eb/0x3300 mm/page_alloc.c:5436 alloc_slab_page mm/slub.c:3347 [inline] allocate_slab mm/slub.c:3462 [inline] new_slab+0xa9/0x6e0 mm/slub.c:3513 refill_objects+0xe3/0x410 mm/slub.c:7410 refill_sheaf mm/slub.c:2885 [inline] __pcs_replace_empty_main+0x35e/0x650 mm/slub.c:4774 alloc_from_pcs mm/slub.c:4850 [inline] slab_alloc_node mm/slub.c:4984 [inline] __do_kmalloc_node mm/slub.c:5413 [inline] __kmalloc_noprof+0x67c/0x840 mm/slub.c:5439 _kmalloc_noprof include/linux/slab.h:995 [inline] _kzalloc_noprof include/linux/slab.h:1312 [inline] __register_sysctl_table+0xac/0x1650 fs/proc/proc_sysctl.c:1378 register_net_sysctl_sz+0x325/0x420 net/sysctl_net.c:172 neigh_sysctl_register+0x326/0x660 net/core/neighbour.c:3915 devinet_sysctl_register+0xb6/0x210 net/ipv4/devinet.c:2781 inetdev_init+0x2b8/0x570 net/ipv4/devinet.c:291 inetdev_event+0x827/0x17f0 net/ipv4/devinet.c:1590 notifier_call_chain+0x99/0x3f0 kernel/notifier.c:85 call_netdevice_notifiers_info+0xbe/0x110 net/core/dev.c:2275 call_netdevice_notifiers_extack net/core/dev.c:2313 [inline] call_netdevice_notifiers net/core/dev.c:2327 [inline] register_netdevice+0x1998/0x25a0 net/core/dev.c:11541 page last free pid 5444 tgid 5444 ts 46790488567 stack trace: reset_page_owner include/linux/page_owner.h:26 [inline] __free_pages_prepare mm/page_alloc.c:1418 [inline] __free_frozen_pages+0x79f/0x10f0 mm/page_alloc.c:2962 qlink_free mm/kasan/quarantine.c:163 [inline] qlist_free_all+0x47/0xf0 mm/kasan/quarantine.c:179 kasan_quarantine_reduce+0x1a0/0x1f0 mm/kasan/quarantine.c:286 __kasan_slab_alloc+0x69/0x90 mm/kasan/common.c:350 kasan_slab_alloc include/linux/kasan.h:253 [inline] slab_post_alloc_hook mm/slub.c:4683 [inline] slab_alloc_node mm/slub.c:4996 [inline] __do_kmalloc_node mm/slub.c:5413 [inline] __kmalloc_noprof+0x2cc/0x840 mm/slub.c:5439 _kmalloc_noprof include/linux/slab.h:995 [inline] tomoyo_add_entry security/tomoyo/common.c:2166 [inline] tomoyo_supervisor+0x65d/0x1340 security/tomoyo/common.c:2238 tomoyo_audit_env_log security/tomoyo/environ.c:37 [inline] tomoyo_env_perm+0x191/0x200 security/tomoyo/environ.c:64 tomoyo_environ security/tomoyo/domain.c:673 [inline] tomoyo_find_next_domain+0x13d7/0x2010 security/tomoyo/domain.c:889 tomoyo_bprm_check_security security/tomoyo/tomoyo.c:102 [inline] tomoyo_bprm_check_security+0x12d/0x1d0 security/tomoyo/tomoyo.c:92 security_bprm_check+0x87/0x1e0 security/security.c:820 search_binary_handler fs/exec.c:1749 [inline] exec_binprm fs/exec.c:1791 [inline] bprm_execve fs/exec.c:1847 [inline] bprm_execve+0x80b/0x1940 fs/exec.c:1823 do_execveat_common.isra.0+0x4a5/0x580 fs/exec.c:1945 __do_sys_execve fs/exec.c:2018 [inline] __se_sys_execve fs/exec.c:2012 [inline] __x64_sys_execve+0x93/0xd0 fs/exec.c:2012 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline] do_syscall_64+0x123/0x790 arch/x86/entry/syscall_64.c:84 entry_SYSCALL_64_after_hwframe+0x77/0x7f Memory state around the buggy address: ffff888027059880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888027059900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff888027059980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888027059a00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888027059a80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================