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Message-ID: <67614ca9.050a0220.37aaf.0160.GAE@google.com> Date: Tue, 17 Dec 2024 02:04:25 -0800 From: syzbot <syzbot+c28dd30bc14158282b3b@...kaller.appspotmail.com> To: andrew+netdev@...n.ch, andrew@...n.ch, davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org, linux-kernel@...r.kernel.org, netdev@...r.kernel.org, pabeni@...hat.com, syzkaller-bugs@...glegroups.com Subject: Re: [syzbot] [net?] WARNING in geneve_udp_encap_recv syzbot has found a reproducer for the following issue on: HEAD commit: f44d154d6e3d Merge tag 'soc-fixes-6.13' of git://git.kerne.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=17e95730580000 kernel config: https://syzkaller.appspot.com/x/.config?x=4f1586bab1323870 dashboard link: https://syzkaller.appspot.com/bug?extid=c28dd30bc14158282b3b compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=133e8b44580000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=10fa4744580000 Downloadable assets: disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/7feb34a89c2a/non_bootable_disk-f44d154d.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/d57bbc97217e/vmlinux-f44d154d.xz kernel image: https://storage.googleapis.com/syzbot-assets/345444afe36f/bzImage-f44d154d.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+c28dd30bc14158282b3b@...kaller.appspotmail.com memcpy: detected field-spanning write (size 8) of single field "_Generic(info, const struct ip_tunnel_info * : ((const void *)((info) + 1)), struct ip_tunnel_info * : ((void *)((info) + 1)) )" at ./include/net/ip_tunnels.h:662 (size 0) WARNING: CPU: 2 PID: 5932 at ./include/net/ip_tunnels.h:662 ip_tunnel_info_opts_set include/net/ip_tunnels.h:662 [inline] WARNING: CPU: 2 PID: 5932 at ./include/net/ip_tunnels.h:662 geneve_rx drivers/net/geneve.c:244 [inline] WARNING: CPU: 2 PID: 5932 at ./include/net/ip_tunnels.h:662 geneve_udp_encap_recv+0x239e/0x2a20 drivers/net/geneve.c:401 Modules linked in: CPU: 2 UID: 0 PID: 5932 Comm: syz-executor272 Not tainted 6.13.0-rc3-syzkaller-00017-gf44d154d6e3d #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 RIP: 0010:ip_tunnel_info_opts_set include/net/ip_tunnels.h:662 [inline] RIP: 0010:geneve_rx drivers/net/geneve.c:244 [inline] RIP: 0010:geneve_udp_encap_recv+0x239e/0x2a20 drivers/net/geneve.c:401 Code: 2b e9 ff ff e8 d3 37 4d fb c6 05 cb 02 fb 09 01 90 31 c9 48 c7 c2 a0 e7 14 8c 4c 89 e6 48 c7 c7 80 e8 14 8c e8 53 72 0d fb 90 <0f> 0b 90 90 e9 54 ed ff ff e8 a4 37 4d fb e8 4f 30 c5 02 31 ff 41 RSP: 0018:ffffc900037bf450 EFLAGS: 00010286 RAX: 0000000000000000 RBX: ffff888035210062 RCX: ffffffff815a5079 RDX: ffff8880232f0000 RSI: ffffffff815a5086 RDI: 0000000000000001 RBP: ffffc900037bf570 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000003 R12: 0000000000000008 R13: ffff88802cbfda00 R14: 0000000000000000 R15: ffff888024a2fb80 FS: 0000555562a2b380(0000) GS:ffff88806a800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00000000200002c0 CR3: 00000000230b2000 CR4: 0000000000352ef0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <TASK> udp_queue_rcv_one_skb+0xad5/0x18b0 net/ipv4/udp.c:2316 udp_queue_rcv_skb+0x198/0xd10 net/ipv4/udp.c:2394 __udp4_lib_mcast_deliver net/ipv4/udp.c:2486 [inline] __udp4_lib_rcv+0x25c4/0x34e0 net/ipv4/udp.c:2625 ip_protocol_deliver_rcu+0x2ff/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_rcv_finish net/ipv4/ip_input.c:447 [inline] NF_HOOK include/linux/netfilter.h:314 [inline] NF_HOOK include/linux/netfilter.h:308 [inline] ip_rcv+0x2c3/0x5d0 net/ipv4/ip_input.c:567 __netif_receive_skb_one_core+0x199/0x1e0 net/core/dev.c:5672 __netif_receive_skb+0x1d/0x160 net/core/dev.c:5785 netif_receive_skb_internal net/core/dev.c:5871 [inline] netif_receive_skb+0x13f/0x7b0 net/core/dev.c:5930 tun_rx_batched.isra.0+0x3eb/0x730 drivers/net/tun.c:1574 tun_get_user+0x2a16/0x3e40 drivers/net/tun.c:2007 tun_chr_write_iter+0xdc/0x210 drivers/net/tun.c:2053 new_sync_write fs/read_write.c:586 [inline] vfs_write+0x5ae/0x1150 fs/read_write.c:679 ksys_write+0x12b/0x250 fs/read_write.c:731 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f293ab4f920 Code: 40 00 48 c7 c2 b8 ff ff ff f7 d8 64 89 02 48 c7 c0 ff ff ff ff eb b7 0f 1f 00 80 3d 81 e7 07 00 00 74 17 b8 01 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 58 c3 0f 1f 80 00 00 00 00 48 83 ec 28 48 89 RSP: 002b:00007ffff606d388 EFLAGS: 00000202 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007ffff606d410 RCX: 00007f293ab4f920 RDX: 0000000000000048 RSI: 00000000200001c0 RDI: 00000000000000c8 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000000 R13: 00007ffff606d3b0 R14: 00007f293ab9e140 R15: 0000555562a2b338 </TASK> --- If you want syzbot to run the reproducer, reply with: #syz test: git://repo/address.git branch-or-commit-hash If you attach or paste a git patch, syzbot will apply it before testing.
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