netdev - Re: general protection fault in fib_dump

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Date:   Tue, 15 Aug 2017 10:21:38 +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

That must be in https://git.kernel.org/pub/scm/linux/kernel/git/davem/net.git
Which one should we test?


On Tue, Aug 15, 2017 at 8:51 AM, Dmitry Vyukov <dvyukov@...gle.com> wrote:
> 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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