netdev - Re: [PATCH net] rtnetlink: Refine sanity checks in rtnl_fdb

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Message-ID: <20181130160208.GB22321@splinter.mtl.com>
Date:   Fri, 30 Nov 2018 18:02:08 +0200
From:   Ido Schimmel <idosch@...sch.org>
To:     David Ahern <dsahern@...il.com>
Cc:     Eric Dumazet <edumazet@...gle.com>,
        David Miller <davem@...emloft.net>,
        netdev <netdev@...r.kernel.org>,
        Eric Dumazet <eric.dumazet@...il.com>,
        syzkaller@...glegroups.com, idosch@...lanox.com
Subject: Re: [PATCH net] rtnetlink: Refine sanity checks in rtnl_fdb_{add|del}

On Fri, Nov 30, 2018 at 08:59:09AM -0700, David Ahern wrote:
> This does not repro for me:
> # ./a.out
> Invalid address length 6 - must be 4 bytes
> RTNETLINK answers: No buffer space available
> RTNETLINK answers: Operation not supported
> Invalid address length 6 - must be 4 bytes
> Invalid address length 6 - must be 4 bytes
> Invalid address length 6 - must be 4 bytes
> Invalid address length 6 - must be 16 bytes
> Invalid address length 6 - must be 16 bytes
> Invalid address length 6 - must be 16 bytes
> 
> config available>?

You need a kernel with kmsan. See:
https://github.com/google/kmsan