netdev - Re: net: heap out-of-bounds in fib6_clean_node/rt6_fill_node/fib6_age/fib6_prune

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Message-ID: <14c01aea-6c2f-6ba5-6aee-52c55f410da7@cumulusnetworks.com>
Date:   Mon, 6 Mar 2017 16:41:02 -0700
From:   David Ahern <dsa@...ulusnetworks.com>
To:     Dmitry Vyukov <dvyukov@...gle.com>
Cc:     Eric Dumazet <eric.dumazet@...il.com>,
        Mahesh Bandewar <maheshb@...gle.com>,
        Eric Dumazet <edumazet@...gle.com>,
        David Miller <davem@...emloft.net>,
        Alexey Kuznetsov <kuznet@....inr.ac.ru>,
        James Morris <jmorris@...ei.org>,
        Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>,
        Patrick McHardy <kaber@...sh.net>,
        netdev <netdev@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Cong Wang <xiyou.wangcong@...il.com>,
        syzkaller <syzkaller@...glegroups.com>
Subject: Re: net: heap out-of-bounds in
 fib6_clean_node/rt6_fill_node/fib6_age/fib6_prune_clone

On 3/6/17 11:51 AM, Dmitry Vyukov wrote:
> We hit it several thousand times, but we get only several dozens of
> crashes per day on ~80 VMs. So if you try to reproduce it on a single
> machine it can take days for a single crash.
> If you are ready to go that route, here are some instructions on
> setting up syzkaller:
> https://github.com/google/syzkaller
> You also need kernel built with CONFIG_KASAN.

ack and I have it setup on ubuntu 16.10 which has a fairly new compiler.

> I am ready to help with resolving any issues.
> 
> Another possible route is if you give me a patch with some additional
> WARNINGs. Then I can deploy it to bots and collect stacks.

try the attached.

View attachment "ipv6-debug.patch" of type "text/plain" (3273 bytes)