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Message-ID: <20260128210313.787486ba@kernel.org> Date: Wed, 28 Jan 2026 21:03:13 -0800 From: Jakub Kicinski <kuba@...nel.org> To: Florian Westphal <fw@...len.de> Cc: <netdev@...r.kernel.org>, Paolo Abeni <pabeni@...hat.com>, "David S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, <netfilter-devel@...r.kernel.org>, pablo@...filter.org Subject: Re: [PATCH net-next 0/9] netfilter: updates for net-next On Wed, 28 Jan 2026 16:41:46 +0100 Florian Westphal wrote: > Patches 1 to 4 add IP6IP6 tunneling acceleration to the flowtable > infrastructure. Patch 5 extends test coverage for this. > From Lorenzo Bianconi. > > Patch 6 removes a duplicated helper from xt_time extension, we can > use an existing helper for this, from Jinjie Ruan. > > Patch 7 adds an rhashtable to nfnetink_queue to speed up out-of-order > verdict processing. Before this list walk was required due to in-order > design assumption. > > Patch 8 fixes an esoteric packet-drop problem with UDPGRO and nfqueue added > in v6.11. Patch 9 adds a test case for this. Hi! There's a UAF in the CI: https://netdev-ctrl.bots.linux.dev/logs/vmksft/nf-dbg/results/494261/vm-crash-thr0-0 [ 580.340726][T19113] sctp: Hash tables configured (bind 32/56) [ 601.749973][ C1] TCP: request_sock_TCP: Possible SYN flooding on port 127.0.0.1:23456. Sending cookies. [ 601.985349][ C2] TCP: request_sock_TCP: Possible SYN flooding on port 127.0.0.1:23456. Sending cookies. [ 602.191750][ C1] TCP: request_sock_TCP: Possible SYN flooding on port 127.0.0.1:23456. Sending cookies. [ 602.555469][ C1] TCP: request_sock_TCP: Possible SYN flooding on port 127.0.0.1:23456. Sending cookies. [ 602.895890][ C1] TCP: request_sock_TCP: Possible SYN flooding on port 127.0.0.1:23456. Sending cookies. [ 603.226543][ C1] TCP: request_sock_TCP: Possible SYN flooding on port 127.0.0.1:23456. Sending cookies. [ 603.435907][ C0] TCP: request_sock_TCP: Possible SYN flooding on port 127.0.0.1:23456. Sending cookies. [ 603.569421][ C1] TCP: request_sock_TCP: Possible SYN flooding on port 127.0.0.1:23456. Sending cookies. [ 603.672454][ C1] TCP: request_sock_TCP: Possible SYN flooding on port 127.0.0.1:23456. Sending cookies. [ 603.821679][ C1] TCP: request_sock_TCP: Possible SYN flooding on port 127.0.0.1:23456. Sending cookies. [ 618.553975][T19316] ================================================================== [ 618.554200][T19316] BUG: KASAN: slab-use-after-free in nfqnl_enqueue_packet+0x8f1/0x9e0 [nfnetlink_queue] [ 618.554424][T19316] Write of size 1 at addr ff1100001cc9ae68 by task socat/19316 [ 618.554600][T19316] [ 618.554662][T19316] CPU: 2 UID: 0 PID: 19316 Comm: socat Not tainted 6.19.0-rc6-virtme #1 PREEMPT(full) [ 618.554665][T19316] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 618.554667][T19316] Call Trace: [ 618.554669][T19316] <TASK> [ 618.554670][T19316] dump_stack_lvl+0x6f/0xa0 [ 618.554678][T19316] print_address_description.constprop.0+0x6e/0x300 [ 618.554683][T19316] print_report+0xfc/0x1fb [ 618.554684][T19316] ? nfqnl_enqueue_packet+0x8f1/0x9e0 [nfnetlink_queue] [ 618.554687][T19316] ? __virt_addr_valid+0x1da/0x430 [ 618.554691][T19316] ? nfqnl_enqueue_packet+0x8f1/0x9e0 [nfnetlink_queue] [ 618.554693][T19316] kasan_report+0xe8/0x120 [ 618.554697][T19316] ? nfqnl_enqueue_packet+0x8f1/0x9e0 [nfnetlink_queue] [ 618.554699][T19316] nfqnl_enqueue_packet+0x8f1/0x9e0 [nfnetlink_queue] [ 618.554702][T19316] ? __nfqnl_enqueue_packet+0x470/0x470 [nfnetlink_queue] [ 618.554703][T19316] ? nf_queue_entry_release_refs+0x230/0x240 [ 618.554707][T19316] ? __nf_queue+0x11f/0x1700 [ 618.554709][T19316] __nf_queue+0x50c/0x1700 [ 618.554710][T19316] ? nft_do_chain_inet+0xd8/0x3a0 [nf_tables] [ 618.554722][T19316] ? nf_queue_entry_get_refs+0x390/0x390 [ 618.554724][T19316] nf_queue+0x18/0x50 [ 618.554726][T19316] nf_hook_slow+0x138/0x1d0 [ 618.554729][T19316] __ip_local_out+0x41f/0x8d0 [ 618.554731][T19316] ? ip_output+0x650/0x650 [ 618.554732][T19316] ? lock_acquire.part.0+0xbc/0x260 [ 618.554735][T19316] ? find_held_lock+0x2b/0x80 [ 618.554737][T19316] ? ip_append_data.part.0+0x1a0/0x1a0 [ 618.554740][T19316] ? ip4_dst_hoplimit+0x15b/0x320 [ 618.554742][T19316] __ip_queue_xmit+0x73f/0x1660 [ 618.554744][T19316] sctp_packet_transmit+0x655/0x1070 [sctp] [ 618.554757][T19316] sctp_outq_flush_transports+0x321/0x6c0 [sctp] [ 618.554768][T19316] sctp_outq_flush+0x125/0x190 [sctp] [ 618.554775][T19316] ? lock_acquire.part.0+0xbc/0x260 [ 618.554777][T19316] ? sctp_outq_flush_data+0x1950/0x1950 [sctp] [ 618.554784][T19316] ? sctp_outq_tail+0x2b8/0xa20 [sctp] [ 618.554791][T19316] sctp_cmd_interpreter.isra.0+0x40e/0x4f50 [sctp] [ 618.554801][T19316] ? sctp_generate_t1_cookie_event+0x20/0x20 [sctp] [ 618.554807][T19316] ? rcu_lockdep_current_cpu_online+0x39/0x1b0 [ 618.554812][T19316] sctp_side_effects+0xcf/0x230 [sctp] [ 618.554819][T19316] ? sctp_cmd_interpreter.isra.0+0x4f50/0x4f50 [sctp] [ 618.554825][T19316] ? __lock_acquire+0x577/0xc10 [ 618.554828][T19316] ? br_deinit+0x5b0/0x5b0 [bridge] [ 618.554836][T19316] sctp_do_sm+0x1a0/0x4e0 [sctp] [ 618.554844][T19316] ? sctp_cname+0x1c0/0x1c0 [sctp] [ 618.554851][T19316] ? __lock_release.isra.0+0x59/0x170 [ 618.554853][T19316] ? sctp_do_8_2_transport_strike.isra.0+0x1160/0x1160 [sctp] [ 618.554860][T19316] ? __might_fault+0x97/0x140 [ 618.554866][T19316] ? sctp_datamsg_from_user+0x677/0x1140 [sctp] [ 618.554875][T19316] ? skb_set_owner_w+0x27e/0x610 [ 618.554879][T19316] ? sock_recv_errqueue+0x4a0/0x4a0 [ 618.554881][T19316] sctp_primitive_SEND+0x82/0xe0 [sctp] [ 618.554889][T19316] sctp_sendmsg_to_asoc+0x9d0/0x1420 [sctp] [ 618.554898][T19316] ? sctp_close+0x850/0x850 [sctp] [ 618.554904][T19316] ? mark_held_locks+0x40/0x70 [ 618.554907][T19316] sctp_sendmsg+0x624/0xd70 [sctp] [ 618.554915][T19316] ? sctp_sendmsg_new_asoc+0x720/0x720 [sctp] [ 618.554921][T19316] ? current_time+0x83/0x300 [ 618.554924][T19316] ? new_sync_write+0x6f0/0x6f0 [ 618.554927][T19316] ? make_vfsuid+0xe0/0xe0 [ 618.554930][T19316] ? ovl_path_next+0x760/0x760 [ 618.554934][T19316] ? atime_needs_update+0x27f/0x5d0 [ 618.554937][T19316] sock_write_iter+0x281/0x4d0 [ 618.554938][T19316] ? backing_file_read_iter+0x50e/0x730 [ 618.554942][T19316] ? ____sys_recvmsg+0x6b0/0x6b0 [ 618.554945][T19316] ? ovl_mmap+0x270/0x270 [ 618.554947][T19316] ? ____sys_recvmsg+0x6b0/0x6b0 [ 618.554948][T19316] new_sync_write+0x3c5/0x6f0 [ 618.554950][T19316] ? new_sync_read+0x24f/0x6f0 [ 618.554952][T19316] ? new_sync_read+0x6f0/0x6f0 [ 618.554954][T19316] ? generic_atomic_write_valid+0x150/0x150 [ 618.554956][T19316] ? __set_current_blocked+0x110/0x110 [ 618.554959][T19316] ? find_held_lock+0x2b/0x80 [ 618.554961][T19316] ? do_pselect.constprop.0+0x14e/0x1f0 [ 618.554964][T19316] vfs_write+0x65e/0xbb0 [ 618.554966][T19316] ? vfs_read+0x3cc/0x790 [ 618.554968][T19316] ksys_write+0x17e/0x200 [ 618.554970][T19316] ? __ia32_sys_read+0xc0/0xc0 [ 618.554972][T19316] ? rcu_is_watching+0x15/0xd0 [ 618.554974][T19316] do_syscall_64+0xbd/0xfc0 [ 618.554979][T19316] entry_SYSCALL_64_after_hwframe+0x4b/0x53 [ 618.554981][T19316] RIP: 0033:0x7fd5f9750c5e [ 618.554984][T19316] Code: 4d 89 d8 e8 34 bd 00 00 4c 8b 5d f8 41 8b 93 08 03 00 00 59 5e 48 83 f8 fc 74 11 c9 c3 0f 1f 80 00 00 00 00 48 8b 45 10 0f 05 <c9> c3 83 e2 39 83 fa 08 75 e7 e8 13 ff ff ff 0f 1f 00 f3 0f 1e fa [ 618.554987][T19316] RSP: 002b:00007fffca8a36c0 EFLAGS: 00000202 ORIG_RAX: 0000000000000001 [ 618.554990][T19316] RAX: ffffffffffffffda RBX: 0000000000000007 RCX: 00007fd5f9750c5e [ 618.554992][T19316] RDX: 0000000000002000 RSI: 000055fcf0fd4000 RDI: 0000000000000007 [ 618.554993][T19316] RBP: 00007fffca8a36d0 R08: 0000000000000000 R09: 0000000000000000 [ 618.554994][T19316] R10: 0000000000000000 R11: 0000000000000202 R12: 000055fcf0fd4000 [ 618.554995][T19316] R13: 0000000000002000 R14: 000055fcf0fd4000 R15: 0000000000000007 [ 618.554997][T19316] </TASK> [ 618.554998][T19316] [ 618.565908][T19316] Allocated by task 19316: [ 618.566029][T19316] kasan_save_stack+0x30/0x50 [ 618.566144][T19316] kasan_save_track+0x14/0x30 [ 618.566258][T19316] __kasan_kmalloc+0x7b/0x90 [ 618.566369][T19316] __kmalloc_noprof+0x2cd/0x820 [ 618.566479][T19316] __nf_queue+0x11f/0x1700 [ 618.566589][T19316] nf_queue+0x18/0x50 [ 618.566671][T19316] nf_hook_slow+0x138/0x1d0 [ 618.566784][T19316] __ip_local_out+0x41f/0x8d0 [ 618.566892][T19316] __ip_queue_xmit+0x73f/0x1660 [ 618.567003][T19316] sctp_packet_transmit+0x655/0x1070 [sctp] [ 618.567148][T19316] sctp_outq_flush_transports+0x321/0x6c0 [sctp] [ 618.567294][T19316] sctp_outq_flush+0x125/0x190 [sctp] [ 618.567408][T19316] sctp_cmd_interpreter.isra.0+0x40e/0x4f50 [sctp] [ 618.567552][T19316] sctp_side_effects+0xcf/0x230 [sctp] [ 618.567670][T19316] sctp_do_sm+0x1a0/0x4e0 [sctp] [ 618.567785][T19316] sctp_primitive_SEND+0x82/0xe0 [sctp] [ 618.567899][T19316] sctp_sendmsg_to_asoc+0x9d0/0x1420 [sctp] [ 618.568040][T19316] sctp_sendmsg+0x624/0xd70 [sctp] [ 618.568160][T19316] sock_write_iter+0x281/0x4d0 [ 618.568270][T19316] new_sync_write+0x3c5/0x6f0 [ 618.568380][T19316] vfs_write+0x65e/0xbb0 [ 618.568464][T19316] ksys_write+0x17e/0x200 [ 618.568546][T19316] do_syscall_64+0xbd/0xfc0 [ 618.568656][T19316] entry_SYSCALL_64_after_hwframe+0x4b/0x53 [ 618.568794][T19316] [ 618.568851][T19316] Freed by task 19314: [ 618.568935][T19316] kasan_save_stack+0x30/0x50 [ 618.569047][T19316] kasan_save_track+0x14/0x30 [ 618.569160][T19316] kasan_save_free_info+0x3b/0x60 [ 618.569273][T19316] __kasan_slab_free+0x43/0x70 [ 618.569390][T19316] kfree+0x119/0x580 [ 618.569472][T19316] nfqnl_reinject+0x7f/0x3d0 [nfnetlink_queue] [ 618.569610][T19316] nfqnl_recv_verdict+0x76f/0xfd3 [nfnetlink_queue] [ 618.569747][T19316] nfnetlink_rcv_msg+0x49b/0xf00 [ 618.569859][T19316] netlink_rcv_skb+0x123/0x380 [ 618.569970][T19316] nfnetlink_rcv+0x166/0x4a0 [ 618.570080][T19316] netlink_unicast+0x4a3/0x770 [ 618.570195][T19316] netlink_sendmsg+0x735/0xc60 [ 618.570307][T19316] __sys_sendto+0x24e/0x360 [ 618.570419][T19316] __x64_sys_sendto+0xe4/0x1f0 [ 618.570529][T19316] do_syscall_64+0xbd/0xfc0 [ 618.570640][T19316] entry_SYSCALL_64_after_hwframe+0x4b/0x53 [ 618.570776][T19316] [ 618.570833][T19316] The buggy address belongs to the object at ff1100001cc9ae00 [ 618.570833][T19316] which belongs to the cache kmalloc-128 of size 128 [ 618.571105][T19316] The buggy address is located 104 bytes inside of [ 618.571105][T19316] freed 128-byte region [ff1100001cc9ae00, ff1100001cc9ae80) [ 618.571381][T19316] [ 618.571438][T19316] The buggy address belongs to the physical page: [ 618.571573][T19316] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xff1100001cc9be80 pfn:0x1cc9a [ 618.571803][T19316] head: order:1 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 [ 618.571972][T19316] flags: 0x80000000000240(workingset|head|node=0|zone=1) [ 618.572115][T19316] page_type: f5(slab) [ 618.572206][T19316] raw: 0080000000000240 ff1100000103ce40 ffd4000000048090 ff11000001032a88 [ 618.572404][T19316] raw: ff1100001cc9be80 0000000000150011 00000000f5000000 0000000000000000 [ 618.572603][T19316] head: 0080000000000240 ff1100000103ce40 ffd4000000048090 ff11000001032a88 [ 618.572798][T19316] head: ff1100001cc9be80 0000000000150011 00000000f5000000 0000000000000000 [ 618.572994][T19316] head: 0080000000000001 ffd4000000732681 00000000ffffffff 00000000ffffffff [ 618.573191][T19316] head: ff1100001cc9bf10 0000000000000000 00000000ffffffff 0000000000000000 [ 618.573390][T19316] page dumped because: kasan: bad access detected [ 618.573527][T19316] [ 618.573584][T19316] Memory state around the buggy address: [ 618.573693][T19316] ff1100001cc9ad00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 618.573856][T19316] ff1100001cc9ad80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 618.574015][T19316] >ff1100001cc9ae00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 618.574179][T19316] ^ [ 618.574343][T19316] ff1100001cc9ae80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 618.574504][T19316] ff1100001cc9af00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 618.574672][T19316] ================================================================== [ 618.574903][T19316] Disabling lock debugging due to kernel taint
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