> -----Original Message----- > From: Dmitry Vyukov <dvyu...@google.com> > Sent: 12-Dec-18 06:03 > To: syzbot+aab62b9c7b12e7c6a...@syzkaller.appspotmail.com; Jon Maloy > <jon.ma...@ericsson.com>; Ying Xue <ying....@windriver.com>; David > Miller <da...@davemloft.net>; tipc-discuss...@lists.sourceforge.net > Cc: Alexey Kuznetsov <kuz...@ms2.inr.ac.ru>; LKML <linux- > ker...@vger.kernel.org>; netdev <net...@vger.kernel.org>; syzkaller-bugs > <syzkaller-b...@googlegroups.com>; Hideaki YOSHIFUJI <yoshfuji@linux- > ipv6.org> > Subject: Re: general protection fault in __ip_append_data > > On Wed, Dec 12, 2018 at 11:57 AM syzbot > <syzbot+aab62b9c7b12e7c6a...@syzkaller.appspotmail.com> wrote: > > > > Hello, > > > > syzbot found the following crash on: > > > > HEAD commit: f5d582777bcb Merge branch 'for-linus' of git://git.kernel... > > git tree: upstream > > console output: > > https://syzkaller.appspot.com/x/log.txt?x=16e03afb400000 > > kernel config: > > https://syzkaller.appspot.com/x/.config?x=c8970c89a0efbb23 > > dashboard link: > https://syzkaller.appspot.com/bug?extid=aab62b9c7b12e7c6ab0b > > compiler: gcc (GCC) 8.0.1 20180413 (experimental) > > syz repro: > https://syzkaller.appspot.com/x/repro.syz?x=13bb9c8b400000 > > C reproducer: > https://syzkaller.appspot.com/x/repro.c?x=1261667d400000 > > From the reproducer it looks like a dup of TIPC bug: > > #syz dup: KASAN: use-after-free Read in kfree_skb (2)
Agree with that, although it is not totally obvious. Let's see what the further testing gives after Cong's patch is applied. ///jon > > > > > IMPORTANT: if you fix the bug, please add the following tag to the commit: > > Reported-by: syzbot+aab62b9c7b12e7c6a...@syzkaller.appspotmail.com > > > > Enabling of bearer <udp:syz1> rejected, already enabled Enabling of > > bearer <udp:syz1> rejected, already enabled Enabling of bearer > > <udp:syz1> rejected, already enabled > > kasan: CONFIG_KASAN_INLINE enabled > > kasan: GPF could be caused by NULL-ptr deref or user memory access > > general protection fault: 0000 [#1] PREEMPT SMP KASAN > > CPU: 1 PID: 16 Comm: ksoftirqd/1 Not tainted 4.20.0-rc6+ #371 Hardware > > name: Google Google Compute Engine/Google Compute Engine, BIOS > Google > > 01/01/2011 > > RIP: 0010:__ip_append_data.isra.48+0x31a/0x29b0 > > net/ipv4/ip_output.c:896 > > Code: c7 85 c8 fd ff ff 00 00 00 00 0f 85 12 10 00 00 e8 7b c1 e0 fa > > 48 8b > > 95 48 fe ff ff 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 <80> 3c 02 00 > > 0f > > 85 e5 22 00 00 48 8b 85 48 fe ff ff 48 8b 18 48 b8 > > RSP: 0018:ffff8881d9b569c0 EFLAGS: 00010246 > > RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffffff869ec275 > > RDX: 0000000000000000 RSI: ffffffff869ec2f5 RDI: 0000000000000001 > > RBP: ffff8881d9b56c28 R08: ffff8881d9b4a440 R09: ffffffff86b113b0 > > R10: ffff8881d9b56da0 R11: 0000000000000000 R12: ffff8881d2c18a88 > > R13: ffffffff86258ba0 R14: ffffffff8bc37110 R15: ffff8881d2c18cd8 > > FS: 0000000000000000(0000) GS:ffff8881daf00000(0000) > > knlGS:0000000000000000 > > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > > CR2: 0000000020001ac0 CR3: 00000001cb6ea000 CR4: 00000000001406e0 > > DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 > > DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call > > Trace: > > ip_append_data.part.49+0xef/0x170 net/ipv4/ip_output.c:1197 > > ip_append_data+0x6d/0x90 net/ipv4/ip_output.c:1186 > > icmp_push_reply+0x18e/0x540 net/ipv4/icmp.c:375 > > icmp_send+0x1544/0x1bd0 net/ipv4/icmp.c:736 > > __udp4_lib_rcv+0x2484/0x32e0 net/ipv4/udp.c:2233 > > udp_rcv+0x21/0x30 net/ipv4/udp.c:2392 > > ip_local_deliver_finish+0x2e9/0xda0 net/ipv4/ip_input.c:215 > > NF_HOOK include/linux/netfilter.h:289 [inline] > > ip_local_deliver+0x1e9/0x750 net/ipv4/ip_input.c:256 > > dst_input include/net/dst.h:450 [inline] > > ip_rcv_finish+0x1f9/0x300 net/ipv4/ip_input.c:415 > > NF_HOOK include/linux/netfilter.h:289 [inline] > > ip_rcv+0xed/0x600 net/ipv4/ip_input.c:524 > > __netif_receive_skb_one_core+0x14d/0x200 net/core/dev.c:4946 > > __netif_receive_skb+0x2c/0x1e0 net/core/dev.c:5056 > > process_backlog+0x24e/0x7a0 net/core/dev.c:5864 > > napi_poll net/core/dev.c:6287 [inline] > > net_rx_action+0x7fa/0x19b0 net/core/dev.c:6353 > > __do_softirq+0x308/0xb7e kernel/softirq.c:292 > > run_ksoftirqd+0x5e/0x100 kernel/softirq.c:654 > > smpboot_thread_fn+0x68b/0xa00 kernel/smpboot.c:164 > > kthread+0x35a/0x440 kernel/kthread.c:246 > > ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:352 Modules linked > > in: > > ---[ end trace 762165cda5fdc138 ]--- > > Enabling of bearer <udp:syz1> rejected, already enabled > > RIP: 0010:__ip_append_data.isra.48+0x31a/0x29b0 > > net/ipv4/ip_output.c:896 > > Code: c7 85 c8 fd ff ff 00 00 00 00 0f 85 12 10 00 00 e8 7b c1 e0 fa > > 48 8b > > 95 48 fe ff ff 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 <80> 3c 02 00 > > 0f > > 85 e5 22 00 00 48 8b 85 48 fe ff ff 48 8b 18 48 b8 Enabling of bearer > > <udp:syz1> rejected, already enabled > > RSP: 0018:ffff8881d9b569c0 EFLAGS: 00010246 > > RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffffff869ec275 > > RDX: 0000000000000000 RSI: ffffffff869ec2f5 RDI: 0000000000000001 > > RBP: ffff8881d9b56c28 R08: ffff8881d9b4a440 R09: ffffffff86b113b0 > > R10: ffff8881d9b56da0 R11: 0000000000000000 R12: ffff8881d2c18a88 > > R13: ffffffff86258ba0 R14: ffffffff8bc37110 R15: ffff8881d2c18cd8 > > Enabling of bearer <udp:syz1> rejected, already enabled > > FS: 0000000000000000(0000) GS:ffff8881daf00000(0000) > > knlGS:0000000000000000 > > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > > CR2: 0000000020001ac0 CR3: 000000000946a000 CR4: 00000000001406e0 > > DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 > > DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 > > > > > > --- > > This bug 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 syzkal...@googlegroups.com. > > > > syzbot will keep track of this bug report. See: > > https://goo.gl/tpsmEJ#bug-status-tracking for how to communicate with > > syzbot. > > syzbot can test patches for this bug, for details see: > > https://goo.gl/tpsmEJ#testing-patches > > > > -- > > You received this message because you are subscribed to the Google > Groups "syzkaller-bugs" group. > > To unsubscribe from this group and stop receiving emails from it, send an > email to syzkaller-bugs+unsubscr...@googlegroups.com. > > To view this discussion on the web visit > https://groups.google.com/d/msgid/syzkaller- > bugs/000000000000e68826057cd10e99%40google.com. > > For more options, visit https://groups.google.com/d/optout.
