Messages in this thread | | | From | Eric Dumazet <> | Date | Fri, 3 Jun 2022 20:26:09 -0700 | Subject | Re: [syzbot] kernel BUG in __skb_gso_segment |
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On Fri, Jun 3, 2022 at 6:02 PM syzbot <syzbot+7160965e6a93d826048a@syzkaller.appspotmail.com> wrote: > > Hello, > > syzbot found the following issue on: > > HEAD commit: 2c5ca23f7414 Merge tag 'ovl-update-5.19' of git://git.kern.. > git tree: upstream > console+strace: https://syzkaller.appspot.com/x/log.txt?x=11330935f00000 > kernel config: https://syzkaller.appspot.com/x/.config?x=9b19cdd2d45cc221 > dashboard link: https://syzkaller.appspot.com/bug?extid=7160965e6a93d826048a > compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2 > syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1724add5f00000 > C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1324cbf9f00000 > > The issue was bisected to: > > commit dfed913e8b55a0c2c4906f1242fd38fd9a116e49 > Author: Hangbin Liu <liuhangbin@gmail.com> > Date: Mon Apr 25 01:45:02 2022 +0000 > > net/af_packet: add VLAN support for AF_PACKET SOCK_RAW GSO > > bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=169079bdf00000 > final oops: https://syzkaller.appspot.com/x/report.txt?x=159079bdf00000 > console output: https://syzkaller.appspot.com/x/log.txt?x=119079bdf00000 > > IMPORTANT: if you fix the issue, please add the following tag to the commit: > Reported-by: syzbot+7160965e6a93d826048a@syzkaller.appspotmail.com > Fixes: dfed913e8b55 ("net/af_packet: add VLAN support for AF_PACKET SOCK_RAW GSO") > > ------------[ cut here ]------------ > kernel BUG at include/linux/skbuff.h:2699! > invalid opcode: 0000 [#1] PREEMPT SMP KASAN > CPU: 1 PID: 3601 Comm: syz-executor210 Not tainted 5.18.0-syzkaller-11338-g2c5ca23f7414 #0 > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 > RIP: 0010:__skb_pull include/linux/skbuff.h:2699 [inline] > RIP: 0010:skb_mac_gso_segment+0x48f/0x530 net/core/gro.c:136 > Code: 00 48 c7 c7 00 96 d4 8a c6 05 cb d3 45 06 01 e8 26 bb d0 01 e9 2f fd ff ff 49 c7 c4 ea ff ff ff e9 f1 fe ff ff e8 91 84 19 fa <0f> 0b 48 89 df e8 97 44 66 fa e9 7f fd ff ff e8 ad 44 66 fa e9 48 > RSP: 0018:ffffc90002e2f4b8 EFLAGS: 00010293 > RAX: 0000000000000000 RBX: 0000000000000012 RCX: 0000000000000000 > RDX: ffff88805bb58000 RSI: ffffffff8760ed0f RDI: 0000000000000004 > RBP: 0000000000005dbc R08: 0000000000000004 R09: 0000000000000fe0 > R10: 0000000000000fe4 R11: 0000000000000000 R12: 0000000000000fe0 > R13: ffff88807194d780 R14: 1ffff920005c5e9b R15: 0000000000000012 > FS: 000055555730f300(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000 > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > CR2: 00000000200015c0 CR3: 0000000071ff8000 CR4: 0000000000350ee0 > Call Trace: > <TASK> > __skb_gso_segment+0x327/0x6e0 net/core/dev.c:3411 > skb_gso_segment include/linux/netdevice.h:4749 [inline] > validate_xmit_skb+0x6bc/0xf10 net/core/dev.c:3669 > validate_xmit_skb_list+0xbc/0x120 net/core/dev.c:3719 > sch_direct_xmit+0x3d1/0xbe0 net/sched/sch_generic.c:327 > __dev_xmit_skb net/core/dev.c:3815 [inline] > __dev_queue_xmit+0x14a1/0x3a00 net/core/dev.c:4219 > packet_snd net/packet/af_packet.c:3071 [inline] > packet_sendmsg+0x21cb/0x5550 net/packet/af_packet.c:3102 > 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: 0033:0x7f4b95da06c9 > Code: 28 c3 e8 4a 15 00 00 66 2e 0f 1f 84 00 00 00 00 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 c0 ff ff ff f7 d8 64 89 01 48 > RSP: 002b:00007ffd7defc4c8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e > RAX: ffffffffffffffda RBX: 00007ffd7defc4f0 RCX: 00007f4b95da06c9 > RDX: 0000000000000000 RSI: 0000000020000140 RDI: 0000000000000003 > RBP: 0000000000000003 R08: bb1414ac00000050 R09: bb1414ac00000050 > R10: 0000000000000004 R11: 0000000000000246 R12: 0000000000000000 > R13: 00007ffd7defc4e0 R14: 00007ffd7defc4d8 R15: 00007ffd7defc4d4 > </TASK> > Modules linked in: > ---[ end trace 0000000000000000 ]--- > RIP: 0010:__skb_pull include/linux/skbuff.h:2699 [inline] > RIP: 0010:skb_mac_gso_segment+0x48f/0x530 net/core/gro.c:136 > Code: 00 48 c7 c7 00 96 d4 8a c6 05 cb d3 45 06 01 e8 26 bb d0 01 e9 2f fd ff ff 49 c7 c4 ea ff ff ff e9 f1 fe ff ff e8 91 84 19 fa <0f> 0b 48 89 df e8 97 44 66 fa e9 7f fd ff ff e8 ad 44 66 fa e9 48 > RSP: 0018:ffffc90002e2f4b8 EFLAGS: 00010293 > RAX: 0000000000000000 RBX: 0000000000000012 RCX: 0000000000000000 > RDX: ffff88805bb58000 RSI: ffffffff8760ed0f RDI: 0000000000000004 > RBP: 0000000000005dbc R08: 0000000000000004 R09: 0000000000000fe0 > R10: 0000000000000fe4 R11: 0000000000000000 R12: 0000000000000fe0 > R13: ffff88807194d780 R14: 1ffff920005c5e9b R15: 0000000000000012 > FS: 000055555730f300(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000 > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > CR2: 00000000200015c0 CR3: 0000000071ff8000 CR4: 0000000000350ee0 > > > --- > 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@googlegroups.com. > > syzbot will keep track of this issue. See: > https://goo.gl/tpsmEJ#status for how to communicate with syzbot. > For information about bisection process see: https://goo.gl/tpsmEJ#bisection > syzbot can test patches for this issue, for details see: > https://goo.gl/tpsmEJ#testing-patches
#syz fix: net/af_packet: make sure to pull mac header
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