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Subject: Re: net: heap out-of-bounds in
 fib6_clean_node/rt6_fill_node/fib6_age/fib6_prune_clone
To: Andrey Konovalov <andreyknvl@google.com>,
        Dmitry Vyukov <dvyukov@google.com>
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Cc: Eric Dumazet <eric.dumazet@gmail.com>,
        Mahesh Bandewar <maheshb@google.com>,
        Eric Dumazet <edumazet@google.com>, David Miller <davem@davemloft.net>,
        Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>,
        James Morris <jmorris@namei.org>,
        Hideaki YOSHIFUJI <yoshfuji@linux-ipv6.org>,
        Patrick McHardy <kaber@trash.net>, netdev <netdev@vger.kernel.org>,
        LKML <linux-kernel@vger.kernel.org>,
        Cong Wang <xiyou.wangcong@gmail.com>,
        syzkaller <syzkaller@googlegroups.com>
From: David Ahern <dsa@cumulusnetworks.com>
Message-ID: <580392d8-fa33-67bb-c5d6-27d262f1646a@cumulusnetworks.com>
Date: Wed, 19 Apr 2017 10:09:19 -0600
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On 4/18/17 2:43 PM, Andrey Konovalov wrote:
> Hi!
> 
> I've finally managed to reproduce one of the crashes on commit
> 4f7d029b9bf009fbee76bb10c0c4351a1870d2f3 (4.11-rc7).
> 
> I'm not sure if this bug has the same root cause as the first one
> reported in this thread, but it definitely has to do with ipv6
> routing.
> 
> C reproducer, syzkaller program and my .config are attached.

built a kernel with that config. booted the vm. ran the program. nada.

strace is showing:

clone(child_stack=0x72ffb0,
flags=CLONE_NEWUTS|CLONE_NEWUSER|CLONE_NEWPID|CLONE_NEWNET) = -1 EINVAL
(Invalid argument)