nf_conntrack: default automatic helper assignment has been turned off for security reasons and CT-based firewall rule not found. Use the iptables CT target to attach helpers instead. ================================================================== BUG: KASAN: use-after-free in __nf_ct_ext_exist include/net/netfilter/nf_conntrack_extend.h:47 [inline] BUG: KASAN: use-after-free in nf_ct_ext_exist include/net/netfilter/nf_conntrack_extend.h:52 [inline] BUG: KASAN: use-after-free in nf_ct_ecache_exist include/net/netfilter/nf_conntrack_ecache.h:42 [inline] BUG: KASAN: use-after-free in nf_conntrack_confirm include/net/netfilter/nf_conntrack_core.h:63 [inline] BUG: KASAN: use-after-free in nf_confirm+0x575/0x5b0 net/netfilter/nf_conntrack_proto.c:154 Read of size 1 at addr ffff88807c107e04 by task syz-executor.0/22619 CPU: 1 PID: 22619 Comm: syz-executor.0 Not tainted 5.18.0-syzkaller-04947-g4b4b4f94a4f6 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106 print_address_description.constprop.0.cold+0xeb/0x495 mm/kasan/report.c:313 print_report mm/kasan/report.c:429 [inline] kasan_report.cold+0xf4/0x1c6 mm/kasan/report.c:491 __nf_ct_ext_exist include/net/netfilter/nf_conntrack_extend.h:47 [inline] nf_ct_ext_exist include/net/netfilter/nf_conntrack_extend.h:52 [inline] nf_ct_ecache_exist include/net/netfilter/nf_conntrack_ecache.h:42 [inline] nf_conntrack_confirm include/net/netfilter/nf_conntrack_core.h:63 [inline] nf_confirm+0x575/0x5b0 net/netfilter/nf_conntrack_proto.c:154 ipv4_confirm+0x17a/0x390 net/netfilter/nf_conntrack_proto.c:182 nf_hook_entry_hookfn include/linux/netfilter.h:142 [inline] nf_hook_slow+0xc5/0x1f0 net/netfilter/core.c:620 nf_hook+0x1cb/0x5b0 include/linux/netfilter.h:262 NF_HOOK_COND include/linux/netfilter.h:295 [inline] ip_output+0x21f/0x310 net/ipv4/ip_output.c:430 dst_output include/net/dst.h:451 [inline] ip_local_out net/ipv4/ip_output.c:126 [inline] ip_send_skb+0xd4/0x260 net/ipv4/ip_output.c:1571 udp_send_skb+0x6c8/0x11a0 net/ipv4/udp.c:967 udp_sendmsg+0x1bee/0x2760 net/ipv4/udp.c:1254 inet_sendmsg+0x99/0xe0 net/ipv4/af_inet.c:819 sock_sendmsg_nosec net/socket.c:714 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:734 rxrpc_send_data_packet+0x1762/0x1e30 net/rxrpc/output.c:451 rxrpc_queue_packet net/rxrpc/sendmsg.c:258 [inline] rxrpc_send_data+0x15c2/0x2e70 net/rxrpc/sendmsg.c:437 rxrpc_do_sendmsg+0xbfe/0x1350 net/rxrpc/sendmsg.c:750 rxrpc_sendmsg+0x429/0x640 net/rxrpc/af_rxrpc.c:561 sock_sendmsg_nosec net/socket.c:714 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:734 ____sys_sendmsg+0x6eb/0x810 net/socket.c:2492 ___sys_sendmsg+0xf3/0x170 net/socket.c:2546 __sys_sendmsg net/socket.c:2575 [inline] __do_sys_sendmsg net/socket.c:2584 [inline] __se_sys_sendmsg net/socket.c:2582 [inline] __x64_sys_sendmsg+0x132/0x220 net/socket.c:2582 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x46/0xb0 RIP: 0033:0x7f00cf889109 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f00d09aa168 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007f00cf99bf60 RCX: 00007f00cf889109 RDX: 0000000000000000 RSI: 00000000200000c0 RDI: 0000000000000006 RBP: 00007f00cf8e308d R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffdc0b3bb4f R14: 00007f00d09aa300 R15: 0000000000022000 Allocated by task 2973: kasan_save_stack+0x1e/0x40 mm/kasan/common.c:38 kasan_set_track mm/kasan/common.c:45 [inline] set_alloc_info mm/kasan/common.c:436 [inline] ____kasan_kmalloc mm/kasan/common.c:515 [inline] ____kasan_kmalloc mm/kasan/common.c:474 [inline] __kasan_kmalloc+0xa9/0xd0 mm/kasan/common.c:524 kmalloc include/linux/slab.h:588 [inline] kernfs_get_open_node fs/kernfs/file.c:547 [inline] kernfs_fop_open+0xa3f/0xe00 fs/kernfs/file.c:693 do_dentry_open+0x4a1/0x11e0 fs/open.c:824 do_open fs/namei.c:3477 [inline] path_openat+0x1c71/0x2910 fs/namei.c:3610 do_filp_open+0x1aa/0x400 fs/namei.c:3637 do_sys_openat2+0x16d/0x4c0 fs/open.c:1213 do_sys_open fs/open.c:1229 [inline] __do_sys_openat fs/open.c:1245 [inline] __se_sys_openat fs/open.c:1240 [inline] __x64_sys_openat+0x13f/0x1f0 fs/open.c:1240 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x46/0xb0 Freed by task 22619: kasan_save_stack+0x1e/0x40 mm/kasan/common.c:38 kasan_set_track+0x21/0x30 mm/kasan/common.c:45 kasan_set_free_info+0x20/0x30 mm/kasan/generic.c:370 ____kasan_slab_free mm/kasan/common.c:366 [inline] ____kasan_slab_free+0x166/0x1a0 mm/kasan/common.c:328 kasan_slab_free include/linux/kasan.h:200 [inline] slab_free_hook mm/slub.c:1727 [inline] slab_free_freelist_hook+0x8b/0x1c0 mm/slub.c:1753 slab_free mm/slub.c:3507 [inline] kfree+0xd6/0x4d0 mm/slub.c:4555 nf_conntrack_free+0x100/0x630 net/netfilter/nf_conntrack_core.c:1680 nf_ct_destroy+0x1be/0x320 net/netfilter/nf_conntrack_core.c:610 nf_ct_put include/net/netfilter/nf_conntrack.h:184 [inline] nf_ct_put include/net/netfilter/nf_conntrack.h:181 [inline] __nf_ct_resolve_clash+0x624/0x785 net/netfilter/nf_conntrack_core.c:1013 nf_ct_resolve_clash+0x14a/0xa23 net/netfilter/nf_conntrack_core.c:1136 __nf_conntrack_confirm.cold+0x16/0x23e net/netfilter/nf_conntrack_core.c:1284 nf_conntrack_confirm include/net/netfilter/nf_conntrack_core.h:62 [inline] nf_confirm+0x4ce/0x5b0 net/netfilter/nf_conntrack_proto.c:154 ipv4_confirm+0x17a/0x390 net/netfilter/nf_conntrack_proto.c:182 nf_hook_entry_hookfn include/linux/netfilter.h:142 [inline] nf_hook_slow+0xc5/0x1f0 net/netfilter/core.c:620 nf_hook+0x1cb/0x5b0 include/linux/netfilter.h:262 NF_HOOK_COND include/linux/netfilter.h:295 [inline] ip_output+0x21f/0x310 net/ipv4/ip_output.c:430 dst_output include/net/dst.h:451 [inline] ip_local_out net/ipv4/ip_output.c:126 [inline] ip_send_skb+0xd4/0x260 net/ipv4/ip_output.c:1571 udp_send_skb+0x6c8/0x11a0 net/ipv4/udp.c:967 udp_sendmsg+0x1bee/0x2760 net/ipv4/udp.c:1254 inet_sendmsg+0x99/0xe0 net/ipv4/af_inet.c:819 sock_sendmsg_nosec net/socket.c:714 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:734 rxrpc_send_data_packet+0x1762/0x1e30 net/rxrpc/output.c:451 rxrpc_queue_packet net/rxrpc/sendmsg.c:258 [inline] rxrpc_send_data+0x15c2/0x2e70 net/rxrpc/sendmsg.c:437 rxrpc_do_sendmsg+0xbfe/0x1350 net/rxrpc/sendmsg.c:750 rxrpc_sendmsg+0x429/0x640 net/rxrpc/af_rxrpc.c:561 sock_sendmsg_nosec net/socket.c:714 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:734 ____sys_sendmsg+0x6eb/0x810 net/socket.c:2492 ___sys_sendmsg+0xf3/0x170 net/socket.c:2546 __sys_sendmsg net/socket.c:2575 [inline] __do_sys_sendmsg net/socket.c:2584 [inline] __se_sys_sendmsg net/socket.c:2582 [inline] __x64_sys_sendmsg+0x132/0x220 net/socket.c:2582 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x46/0xb0 The buggy address belongs to the object at ffff88807c107e00 which belongs to the cache kmalloc-128 of size 128 The buggy address is located 4 bytes inside of 128-byte region [ffff88807c107e00, ffff88807c107e80) The buggy address belongs to the physical page: page:ffffea0001f041c0 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x7c107 flags: 0xfff00000000200(slab|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000000200 ffffea0001f861c0 dead000000000004 ffff888010c418c0 raw: 0000000000000000 0000000080100010 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 4117, tgid 4117 (dhcpcd-run-hook), ts 118587853500, free_ts 118586370091 prep_new_page mm/page_alloc.c:2441 [inline] get_page_from_freelist+0xba2/0x3e00 mm/page_alloc.c:4182 __alloc_pages+0x1b2/0x500 mm/page_alloc.c:5408 __alloc_pages_node include/linux/gfp.h:587 [inline] alloc_slab_page mm/slub.c:1799 [inline] allocate_slab+0x80/0x3c0 mm/slub.c:1942 new_slab mm/slub.c:2002 [inline] ___slab_alloc+0x985/0xd90 mm/slub.c:3002 __slab_alloc.constprop.0+0x4d/0xa0 mm/slub.c:3089 slab_alloc_node mm/slub.c:3180 [inline] __kmalloc_node+0x2cb/0x390 mm/slub.c:4461 kmalloc_array_node include/linux/slab.h:683 [inline] kcalloc_node include/linux/slab.h:688 [inline] memcg_alloc_slab_cgroups+0x8b/0x140 mm/memcontrol.c:2810 account_slab mm/slab.h:653 [inline] allocate_slab+0x2c9/0x3c0 mm/slub.c:1958 new_slab mm/slub.c:2002 [inline] ___slab_alloc+0x985/0xd90 mm/slub.c:3002 __slab_alloc.constprop.0+0x4d/0xa0 mm/slub.c:3089 slab_alloc_node mm/slub.c:3180 [inline] slab_alloc mm/slub.c:3222 [inline] __kmem_cache_alloc_lru mm/slub.c:3229 [inline] kmem_cache_alloc+0x360/0x3b0 mm/slub.c:3239 vm_area_dup+0x88/0x3f0 kernel/fork.c:467 dup_mmap kernel/fork.c:643 [inline] dup_mm+0x5fa/0x13d0 kernel/fork.c:1526 copy_mm kernel/fork.c:1578 [inline] copy_process+0x3b1c/0x6ff0 kernel/fork.c:2239 kernel_clone+0xe7/0xab0 kernel/fork.c:2644 __do_sys_clone+0xc8/0x110 kernel/fork.c:2761 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1356 [inline] free_pcp_prepare+0x549/0xd20 mm/page_alloc.c:1406 free_unref_page_prepare mm/page_alloc.c:3328 [inline] free_unref_page+0x19/0x6a0 mm/page_alloc.c:3423 tlb_batch_list_free mm/mmu_gather.c:62 [inline] tlb_finish_mmu+0x24f/0x8c0 mm/mmu_gather.c:344 exit_mmap+0x1de/0x4a0 mm/mmap.c:3142 __mmput+0x122/0x4b0 kernel/fork.c:1189 mmput+0x56/0x60 kernel/fork.c:1210 exit_mm kernel/exit.c:510 [inline] do_exit+0xa12/0x2a00 kernel/exit.c:782 do_group_exit+0xd2/0x2f0 kernel/exit.c:925 __do_sys_exit_group kernel/exit.c:936 [inline] __se_sys_exit_group kernel/exit.c:934 [inline] __x64_sys_exit_group+0x3a/0x50 kernel/exit.c:934 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x46/0xb0 Memory state around the buggy address: ffff88807c107d00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88807c107d80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff88807c107e00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88807c107e80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88807c107f00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================