netdev - Re: general protection fault in fib_dump

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Date:   Tue, 15 Aug 2017 08:51:03 +0200
From:   Dmitry Vyukov <dvyukov@...gle.com>
To:     idaifish <idaifish@...il.com>
Cc:     Eric Dumazet <eric.dumazet@...il.com>,
        David Miller <davem@...emloft.net>,
        Alexey Kuznetsov <kuznet@....inr.ac.ru>,
        Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>,
        netdev <netdev@...r.kernel.org>,
        syzkaller <syzkaller@...glegroups.com>
Subject: Re: general protection fault in fib_dump_info

Eric, what's the "David Miller net tree"? Is it
https://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next.git? I
don't see 2c87d63ac853550e734edfd45e1be5e5aa44fbcc there.
https://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next.git is
what we are testing and the last commit on which we saw this bug is:

commit cb44a8606f063099991242ada4b8fa2fb26769b3
Merge: 54161ed4eede a656d34a6e5a
Author: David S. Miller
Date:   Mon Aug 14 11:18:16 2017 -0700
    Merge branch 'mlnx-i2c'



On Tue, Aug 15, 2017 at 8:42 AM, idaifish <idaifish@...il.com> wrote:
> The bug still looks like reproducible after applying the patch [
> https://git.kernel.org/pub/scm/linux/kernel/git/davem/net.git/commit/?id=2c87d63ac853550e734edfd45e1be5e5aa44fbcc
> ]
>
>
>
> 2017-08-15 11:33 GMT+08:00 Eric Dumazet <eric.dumazet@...il.com>:
>> On Tue, 2017-08-15 at 10:49 +0800, idaifish wrote:
>>> Syzkaller hit 'general protection fault in fib_dump_info' bug on
>>> commit 4.13-rc5..
>>>
>>> Guilty file: net/ipv4/fib_semantics.c
>>>
>>> kasan: GPF could be caused by NULL-ptr deref or user memory access
>>> general protection fault: 0000 [#1] SMP KASAN
>>> Modules linked in:
>>> CPU: 0 PID: 2808 Comm: syz-executor0 Not tainted 4.13.0-rc5 #1
>>> Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS
>>> Ubuntu-1.8.2-1ubuntu1 04/01/2014
>>> task: ffff880078562700 task.stack: ffff880078110000
>>> RIP: 0010:fib_dump_info+0x388/0x1170 net/ipv4/fib_semantics.c:1314
>>> RSP: 0018:ffff880078117010 EFLAGS: 00010206
>>> RAX: dffffc0000000000 RBX: 00000000000000fe RCX: 0000000000000002
>>> RDX: 0000000000000006 RSI: ffff880078117084 RDI: 0000000000000030
>>> RBP: ffff880078117268 R08: 000000000000000c R09: ffff8800780d80c8
>>> R10: 0000000058d629b4 R11: 0000000067fce681 R12: 0000000000000000
>>> R13: ffff8800784bd540 R14: ffff8800780d80b5 R15: ffff8800780d80a4
>>> FS:  00000000022fa940(0000) GS:ffff88007fc00000(0000) knlGS:0000000000000000
>>> CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
>>> CR2: 00000000004387d0 CR3: 0000000079135000 CR4: 00000000000006f0
>>> Call Trace:
>>>  inet_rtm_getroute+0xc89/0x1f50 net/ipv4/route.c:2766
>>>  rtnetlink_rcv_msg+0x288/0x680 net/core/rtnetlink.c:4217
>>>  netlink_rcv_skb+0x340/0x470 net/netlink/af_netlink.c:2397
>>>  rtnetlink_rcv+0x28/0x30 net/core/rtnetlink.c:4223
>>>  netlink_unicast_kernel net/netlink/af_netlink.c:1265 [inline]
>>>  netlink_unicast+0x4c4/0x6e0 net/netlink/af_netlink.c:1291
>>>  netlink_sendmsg+0x8c4/0xca0 net/netlink/af_netlink.c:1854
>>>  sock_sendmsg_nosec net/socket.c:633 [inline]
>>>  sock_sendmsg+0xca/0x110 net/socket.c:643
>>>  ___sys_sendmsg+0x779/0x8d0 net/socket.c:2035
>>>  __sys_sendmsg+0xd1/0x170 net/socket.c:2069
>>>  SYSC_sendmsg net/socket.c:2080 [inline]
>>>  SyS_sendmsg+0x2d/0x50 net/socket.c:2076
>>>  entry_SYSCALL_64_fastpath+0x1a/0xa5
>>> RIP: 0033:0x4512e9
>>> RSP: 002b:00007ffc75584cc8 EFLAGS: 00000216 ORIG_RAX: 000000000000002e
>>> RAX: ffffffffffffffda RBX: 0000000000000002 RCX: 00000000004512e9
>>> RDX: 0000000000000000 RSI: 0000000020f2cfc8 RDI: 0000000000000003
>>> RBP: 000000000000000e R08: 0000000000000000 R09: 0000000000000000
>>> R10: 0000000000000000 R11: 0000000000000216 R12: fffffffffffffffe
>>> R13: 0000000000718000 R14: 0000000020c44ff0 R15: 0000000000000000
>>> Code: 00 0f b6 8d ec fd ff ff 48 8b 85 f0 fd ff ff 88 48 17 48 8b 45
>>> 28 48 8d 78 30 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <0f>
>>> b6 04 02 84 c0 74 08 3c 03 0f 8e cb 0c 00 00 48 8b 45 28 44
>>> RIP: fib_dump_info+0x388/0x1170 net/ipv4/fib_semantics.c:1314 RSP:
>>> ffff880078117010
>>> ---[ end trace 254a7af28348f88b ]---
>>> Kernel panic - not syncing: Fatal exception
>>> Kernel Offset: disabled
>>> Rebooting in 86400 seconds..
>>>
>>> ---------------------
>>>
>>> .config and reproducer.prog are attached.  Unfortunately the extracted
>>> C program can't work.
>>> Maybe you can follow the instruction
>>> [https://github.com/google/syzkaller/blob/master/docs/executing_syzkaller_programs.md]
>>> to reproduce the bug.
>>>
>>>
>>
>> Probably fixed by commit 2c87d63ac853550e734edfd45e1be5e5aa44fbcc
>> ("ipv4: route: fix inet_rtm_getroute induced crash")
>> (In David Miller net tree)
>>
>>
>
>
>
> --
> Regards,
> idaifish
>
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