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Message-ID: <20240418170713.24385-1-kuniyu@amazon.com> Date: Thu, 18 Apr 2024 10:07:13 -0700 From: Kuniyuki Iwashima <kuniyu@...zon.com> To: <edumazet@...gle.com> CC: <davem@...emloft.net>, <kuba@...nel.org>, <kuniyu@...zon.com>, <linux-kernel@...r.kernel.org>, <netdev@...r.kernel.org>, <pabeni@...hat.com>, <syzbot+42a0dc856239de4de60e@...kaller.appspotmail.com>, <syzkaller-bugs@...glegroups.com> Subject: Re: [syzbot] [net?] KMSAN: uninit-value in ipvlan_queue_xmit (2) From: Eric Dumazet <edumazet@...gle.com> Date: Thu, 18 Apr 2024 09:19:20 +0200 > On Thu, Apr 18, 2024 at 9:05 AM syzbot > <syzbot+42a0dc856239de4de60e@...kaller.appspotmail.com> wrote: > > > > Hello, > > > > syzbot found the following issue on: > > > > HEAD commit: f2e367d6ad3b Merge tag 'for-6.8/dm-fix-3' of git://git.ker.. > > git tree: upstream > > console+strace: https://syzkaller.appspot.com/x/log.txt?x=144a8d4a180000 > > kernel config: https://syzkaller.appspot.com/x/.config?x=1b015d567058472 > > dashboard link: https://syzkaller.appspot.com/bug?extid=42a0dc856239de4de60e > > compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 > > syz repro: https://syzkaller.appspot.com/x/repro.syz?x=149caa54180000 > > C reproducer: https://syzkaller.appspot.com/x/repro.c?x=10bb8e22180000 > > > > Downloadable assets: > > disk image: https://storage.googleapis.com/syzbot-assets/0dabc03369d1/disk-f2e367d6.raw.xz > > vmlinux: https://storage.googleapis.com/syzbot-assets/240ca250d398/vmlinux-f2e367d6.xz > > kernel image: https://storage.googleapis.com/syzbot-assets/cc38bcdb48c9/bzImage-f2e367d6.xz > > > > IMPORTANT: if you fix the issue, please add the following tag to the commit: > > Reported-by: syzbot+42a0dc856239de4de60e@...kaller.appspotmail.com > > > > ===================================================== > > BUG: KMSAN: uninit-value in ipvlan_process_outbound drivers/net/ipvlan/ipvlan_core.c:524 [inline] > > BUG: KMSAN: uninit-value in ipvlan_xmit_mode_l3 drivers/net/ipvlan/ipvlan_core.c:602 [inline] > > BUG: KMSAN: uninit-value in ipvlan_queue_xmit+0xf44/0x16b0 drivers/net/ipvlan/ipvlan_core.c:668 > > ipvlan_process_outbound drivers/net/ipvlan/ipvlan_core.c:524 [inline] > > ipvlan_xmit_mode_l3 drivers/net/ipvlan/ipvlan_core.c:602 [inline] > > ipvlan_queue_xmit+0xf44/0x16b0 drivers/net/ipvlan/ipvlan_core.c:668 > > ipvlan_start_xmit+0x5c/0x1a0 drivers/net/ipvlan/ipvlan_main.c:222 > > __netdev_start_xmit include/linux/netdevice.h:4989 [inline] > > netdev_start_xmit include/linux/netdevice.h:5003 [inline] > > xmit_one net/core/dev.c:3547 [inline] > > dev_hard_start_xmit+0x244/0xa10 net/core/dev.c:3563 > > __dev_queue_xmit+0x33ed/0x51c0 net/core/dev.c:4351 > > dev_queue_xmit include/linux/netdevice.h:3171 [inline] > > packet_xmit+0x9c/0x6b0 net/packet/af_packet.c:276 > > packet_snd net/packet/af_packet.c:3081 [inline] > > packet_sendmsg+0x8aef/0x9f10 net/packet/af_packet.c:3113 > > sock_sendmsg_nosec net/socket.c:730 [inline] > > __sock_sendmsg net/socket.c:745 [inline] > > __sys_sendto+0x735/0xa10 net/socket.c:2191 > > __do_sys_sendto net/socket.c:2203 [inline] > > __se_sys_sendto net/socket.c:2199 [inline] > > __x64_sys_sendto+0x125/0x1c0 net/socket.c:2199 > > do_syscall_x64 arch/x86/entry/common.c:52 [inline] > > do_syscall_64+0xcf/0x1e0 arch/x86/entry/common.c:83 > > entry_SYSCALL_64_after_hwframe+0x63/0x6b > > > > Uninit was created at: > > slab_post_alloc_hook mm/slub.c:3819 [inline] > > slab_alloc_node mm/slub.c:3860 [inline] > > __do_kmalloc_node mm/slub.c:3980 [inline] > > __kmalloc_node_track_caller+0x705/0x1000 mm/slub.c:4001 > > kmalloc_reserve+0x249/0x4a0 net/core/skbuff.c:582 > > __alloc_skb+0x352/0x790 net/core/skbuff.c:651 > > skb_segment+0x20aa/0x7080 net/core/skbuff.c:4647 > > udp6_ufo_fragment+0xcab/0x1150 net/ipv6/udp_offload.c:109 > > ipv6_gso_segment+0x14be/0x2ca0 net/ipv6/ip6_offload.c:152 > > skb_mac_gso_segment+0x3e8/0x760 net/core/gso.c:53 > > nsh_gso_segment+0x6f4/0xf70 net/nsh/nsh.c:108 > > skb_mac_gso_segment+0x3e8/0x760 net/core/gso.c:53 > > __skb_gso_segment+0x4b0/0x730 net/core/gso.c:124 > > skb_gso_segment include/net/gso.h:83 [inline] > > validate_xmit_skb+0x107f/0x1930 net/core/dev.c:3628 > > __dev_queue_xmit+0x1f28/0x51c0 net/core/dev.c:4343 > > dev_queue_xmit include/linux/netdevice.h:3171 [inline] > > packet_xmit+0x9c/0x6b0 net/packet/af_packet.c:276 > > packet_snd net/packet/af_packet.c:3081 [inline] > > packet_sendmsg+0x8aef/0x9f10 net/packet/af_packet.c:3113 > > sock_sendmsg_nosec net/socket.c:730 [inline] > > __sock_sendmsg net/socket.c:745 [inline] > > __sys_sendto+0x735/0xa10 net/socket.c:2191 > > __do_sys_sendto net/socket.c:2203 [inline] > > __se_sys_sendto net/socket.c:2199 [inline] > > __x64_sys_sendto+0x125/0x1c0 net/socket.c:2199 > > do_syscall_x64 arch/x86/entry/common.c:52 [inline] > > do_syscall_64+0xcf/0x1e0 arch/x86/entry/common.c:83 > > entry_SYSCALL_64_after_hwframe+0x63/0x6b > > > > CPU: 1 PID: 5101 Comm: syz-executor421 Not tainted 6.8.0-rc5-syzkaller-00297-gf2e367d6ad3b #0 > > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024 > > ===================================================== > > > > > > --- > > This report is generated by a bot. It may contain errors. > > See https://goo.gl/tpsmEJ for more information about syzbot. > > syzbot engineers can be reached at syzkaller@...glegroups.com. > > > > syzbot will keep track of this issue. See: > > https://goo.gl/tpsmEJ#status for how to communicate with syzbot. > > > > If the report is already addressed, let syzbot know by replying with: > > #syz fix: exact-commit-title > > > > 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. > > > > If you want to overwrite report's subsystems, reply with: > > #syz set subsystems: new-subsystem > > (See the list of subsystem names on the web dashboard) > > > > If the report is a duplicate of another one, reply with: > > #syz dup: exact-subject-of-another-report > > > > If you want to undo deduplication, reply with: > > #syz undup > > Cc Kuniyuki Iwashima > > This is the syzbot bug I mentioned earlier to you. Will look into it. Thanks!
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