================================================================== BUG: KASAN: slab-out-of-bounds in selinux_sock security/selinux/include/objsec.h:207 [inline] BUG: KASAN: slab-out-of-bounds in selinux_ip_output+0x1e0/0x1f0 security/selinux/hooks.c:5761 Read of size 8 at addr ffff8880448ac758 by task syz-executor/9456 CPU: 1 UID: 0 PID: 9456 Comm: syz-executor Not tainted 6.12.0-syzkaller-09073-g9f16d5e6f220 #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:378 [inline] print_report+0xc3/0x620 mm/kasan/report.c:489 kasan_report+0xd9/0x110 mm/kasan/report.c:602 selinux_sock security/selinux/include/objsec.h:207 [inline] selinux_ip_output+0x1e0/0x1f0 security/selinux/hooks.c:5761 nf_hook_entry_hookfn include/linux/netfilter.h:154 [inline] nf_hook_slow+0xbb/0x200 net/netfilter/core.c:626 nf_hook+0x386/0x6d0 include/linux/netfilter.h:269 __ip_local_out+0x339/0x640 net/ipv4/ip_output.c:119 ip_local_out net/ipv4/ip_output.c:128 [inline] ip_send_skb net/ipv4/ip_output.c:1505 [inline] ip_push_pending_frames+0xa0/0x5b0 net/ipv4/ip_output.c:1525 ip_send_unicast_reply+0xd0e/0x1650 net/ipv4/ip_output.c:1672 tcp_v4_send_reset+0x129b/0x2f20 net/ipv4/tcp_ipv4.c:910 tcp_v4_rcv+0x371d/0x4390 net/ipv4/tcp_ipv4.c:2431 ip_protocol_deliver_rcu+0xba/0x4c0 net/ipv4/ip_input.c:205 ip_local_deliver_finish+0x316/0x570 net/ipv4/ip_input.c:233 NF_HOOK include/linux/netfilter.h:314 [inline] NF_HOOK include/linux/netfilter.h:308 [inline] ip_local_deliver+0x18e/0x1f0 net/ipv4/ip_input.c:254 dst_input include/net/dst.h:460 [inline] ip_sublist_rcv_finish+0x2c1/0x620 net/ipv4/ip_input.c:578 ip_list_rcv_finish.constprop.0+0x559/0x720 net/ipv4/ip_input.c:628 ip_sublist_rcv net/ipv4/ip_input.c:636 [inline] ip_list_rcv+0x339/0x450 net/ipv4/ip_input.c:670 __netif_receive_skb_list_ptype net/core/dev.c:5715 [inline] __netif_receive_skb_list_core+0x755/0x950 net/core/dev.c:5762 __netif_receive_skb_list net/core/dev.c:5814 [inline] netif_receive_skb_list_internal+0x753/0xdb0 net/core/dev.c:5905 gro_normal_list include/net/gro.h:515 [inline] gro_normal_list include/net/gro.h:511 [inline] napi_complete_done+0x218/0x940 net/core/dev.c:6256 e1000_clean+0xa28/0x2700 drivers/net/ethernet/intel/e1000/e1000_main.c:3815 __napi_poll.constprop.0+0xb7/0x550 net/core/dev.c:6877 napi_poll net/core/dev.c:6946 [inline] net_rx_action+0xa94/0x1010 net/core/dev.c:7068 handle_softirqs+0x213/0x8f0 kernel/softirq.c:554 __do_softirq kernel/softirq.c:588 [inline] invoke_softirq kernel/softirq.c:428 [inline] __irq_exit_rcu+0x109/0x170 kernel/softirq.c:655 irq_exit_rcu+0x9/0x30 kernel/softirq.c:671 common_interrupt+0xbf/0xe0 arch/x86/kernel/irq.c:278 asm_common_interrupt+0x26/0x40 arch/x86/include/asm/idtentry.h:693 RIP: 0010:__page_table_check_pte_clear+0xc3/0x580 mm/page_table_check.c:171 Code: 89 e5 83 e5 05 48 89 ee e8 ba 5c 91 ff 48 83 fd 05 74 3c e8 3f 5a 91 ff 48 b8 00 00 00 00 00 fc ff df 48 c7 04 03 00 00 00 00 <48> 8b 44 24 58 65 48 2b 04 25 28 00 00 00 0f 85 57 04 00 00 48 83 RSP: 0018:ffffc900034575e0 EFLAGS: 00000293 RAX: dffffc0000000000 RBX: 1ffff9200068aebc RCX: ffffc90003457510 RDX: ffff888027de4880 RSI: ffffffff81fd6091 RDI: ffff888027de4cc4 RBP: 00000000000132d4 R08: 0000000000000000 R09: fffffbfff20c12ca R10: ffffffff90609657 R11: 0000000000000003 R12: 0000000080000001 R13: 0000000000000008 R14: 0000000000000001 R15: ffffc90003457aa8 page_table_check_pte_clear include/linux/page_table_check.h:49 [inline] ptep_get_and_clear_full arch/x86/include/asm/pgtable.h:1337 [inline] get_and_clear_full_ptes include/linux/pgtable.h:705 [inline] zap_present_folio_ptes mm/memory.c:1502 [inline] zap_present_ptes mm/memory.c:1585 [inline] zap_pte_range mm/memory.c:1627 [inline] zap_pmd_range mm/memory.c:1753 [inline] zap_pud_range mm/memory.c:1782 [inline] zap_p4d_range mm/memory.c:1803 [inline] unmap_page_range+0x22f6/0x3d60 mm/memory.c:1824 unmap_single_vma+0x194/0x2b0 mm/memory.c:1870 unmap_vmas+0x22f/0x490 mm/memory.c:1914 exit_mmap+0x1c6/0xb30 mm/mmap.c:1667 __mmput+0x12a/0x480 kernel/fork.c:1347 mmput+0x62/0x70 kernel/fork.c:1369 exit_mm kernel/exit.c:570 [inline] do_exit+0x9bf/0x2d70 kernel/exit.c:925 do_group_exit+0xd3/0x2a0 kernel/exit.c:1087 get_signal+0x24ed/0x26c0 kernel/signal.c:3016 arch_do_signal_or_restart+0x90/0x7e0 arch/x86/kernel/signal.c:337 exit_to_user_mode_loop kernel/entry/common.c:111 [inline] exit_to_user_mode_prepare include/linux/entry-common.h:329 [inline] __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline] syscall_exit_to_user_mode+0x150/0x2a0 kernel/entry/common.c:218 do_syscall_64+0xda/0x250 arch/x86/entry/common.c:89 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fa423774a53 Code: Unable to access opcode bytes at 0x7fa423774a29. RSP: 002b:00007ffff20157b8 EFLAGS: 00000202 ORIG_RAX: 000000000000003d RAX: fffffffffffffe00 RBX: 00000000000024f8 RCX: 00007fa423774a53 RDX: 0000000040000000 RSI: 00007ffff20157cc RDI: 00000000ffffffff RBP: 00007ffff20157cc R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000008 R13: 0000000000000003 R14: 0000000000000009 R15: 0000000000000000 The buggy address belongs to the object at ffff8880448ac6e0 which belongs to the cache tw_sock_TCP of size 288 The buggy address is located 120 bytes inside of allocated 288-byte region [ffff8880448ac6e0, ffff8880448ac800) The buggy address belongs to the physical page: page: refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff8880448ac000 pfn:0x448ac head: order:1 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 memcg:ffff88802526cb01 flags: 0xfff00000000040(head|node=0|zone=1|lastcpupid=0x7ff) page_type: f5(slab) raw: 00fff00000000040 ffff888103f02a00 dead000000000122 0000000000000000 raw: ffff8880448ac000 0000000080170016 00000001f5000000 ffff88802526cb01 head: 00fff00000000040 ffff888103f02a00 dead000000000122 0000000000000000 head: ffff8880448ac000 0000000080170016 00000001f5000000 ffff88802526cb01 head: 00fff00000000001 ffffea0001122b01 ffffffffffffffff 0000000000000000 head: 0000000000000002 0000000000000000 00000000ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 1, migratetype Unmovable, gfp_mask 0x52820(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP), pid 7909, tgid 7908 (syz.5.459), ts 91455704224, free_ts 91262852031 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x2d1/0x350 mm/page_alloc.c:1556 prep_new_page mm/page_alloc.c:1564 [inline] get_page_from_freelist+0xfce/0x2f80 mm/page_alloc.c:3474 __alloc_pages_noprof+0x223/0x25a0 mm/page_alloc.c:4751 alloc_pages_mpol_noprof+0x2c9/0x610 mm/mempolicy.c:2265 alloc_slab_page mm/slub.c:2412 [inline] allocate_slab mm/slub.c:2578 [inline] new_slab+0x2c9/0x410 mm/slub.c:2631 ___slab_alloc+0xdac/0x1880 mm/slub.c:3818 __slab_alloc.constprop.0+0x56/0xb0 mm/slub.c:3908 __slab_alloc_node mm/slub.c:3961 [inline] slab_alloc_node mm/slub.c:4122 [inline] kmem_cache_alloc_noprof+0x2a7/0x2f0 mm/slub.c:4141 inet_twsk_alloc+0x120/0x970 net/ipv4/inet_timewait_sock.c:188 tcp_time_wait+0x5f/0xe10 net/ipv4/tcp_minisocks.c:309 tcp_rcv_state_process+0x1fda/0x4c40 net/ipv4/tcp_input.c:6925 tcp_v4_do_rcv+0x1ad/0xa90 net/ipv4/tcp_ipv4.c:1939 sk_backlog_rcv include/net/sock.h:1121 [inline] __release_sock+0x31b/0x400 net/core/sock.c:3083 __tcp_close+0x4f3/0xff0 net/ipv4/tcp.c:3143 tcp_close+0x28/0x120 net/ipv4/tcp.c:3221 inet_release+0x13c/0x280 net/ipv4/af_inet.c:435 page last free pid 24 tgid 24 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1127 [inline] free_unref_page+0x661/0x1080 mm/page_alloc.c:2657 __folio_put+0x32a/0x450 mm/swap.c:112 folio_put include/linux/mm.h:1488 [inline] free_page_and_swap_cache+0x249/0x2c0 mm/swap_state.c:308 __tlb_remove_table arch/x86/include/asm/tlb.h:34 [inline] __tlb_remove_table_free mm/mmu_gather.c:227 [inline] tlb_remove_table_rcu+0x89/0xe0 mm/mmu_gather.c:282 rcu_do_batch kernel/rcu/tree.c:2567 [inline] rcu_core+0x79d/0x14d0 kernel/rcu/tree.c:2823 handle_softirqs+0x213/0x8f0 kernel/softirq.c:554 run_ksoftirqd kernel/softirq.c:943 [inline] run_ksoftirqd+0x3a/0x60 kernel/softirq.c:935 smpboot_thread_fn+0x661/0xa30 kernel/smpboot.c:164 kthread+0x2c1/0x3a0 kernel/kthread.c:389 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 Memory state around the buggy address: ffff8880448ac600: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff8880448ac680: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff8880448ac700: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff8880448ac780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff8880448ac800: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ================================================================== ---------------- Code disassembly (best guess): 0: 89 e5 mov %esp,%ebp 2: 83 e5 05 and $0x5,%ebp 5: 48 89 ee mov %rbp,%rsi 8: e8 ba 5c 91 ff call 0xff915cc7 d: 48 83 fd 05 cmp $0x5,%rbp 11: 74 3c je 0x4f 13: e8 3f 5a 91 ff call 0xff915a57 18: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax 1f: fc ff df 22: 48 c7 04 03 00 00 00 movq $0x0,(%rbx,%rax,1) 29: 00 * 2a: 48 8b 44 24 58 mov 0x58(%rsp),%rax <-- trapping instruction 2f: 65 48 2b 04 25 28 00 sub %gs:0x28,%rax 36: 00 00 38: 0f 85 57 04 00 00 jne 0x495 3e: 48 rex.W 3f: 83 .byte 0x83