netdev - Re: WARNING in __proc

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Message-ID: <20180309231859.GA11882@breakpoint.cc>
Date:   Sat, 10 Mar 2018 00:18:59 +0100
From:   Florian Westphal <fw@...len.de>
To:     Cong Wang <xiyou.wangcong@...il.com>
Cc:     Eric Dumazet <eric.dumazet@...il.com>,
        syzbot <syzbot+0502b00edac2a0680b61@...kaller.appspotmail.com>,
        coreteam@...filter.org, David Miller <davem@...emloft.net>,
        Florian Westphal <fw@...len.de>,
        Jozsef Kadlecsik <kadlec@...ckhole.kfki.hu>,
        LKML <linux-kernel@...r.kernel.org>,
        Linux Kernel Network Developers <netdev@...r.kernel.org>,
        netfilter-devel@...r.kernel.org,
        Pablo Neira Ayuso <pablo@...filter.org>,
        syzkaller-bugs@...glegroups.com
Subject: Re: WARNING in __proc_create

Cong Wang <xiyou.wangcong@...il.com> wrote:
> On Fri, Mar 9, 2018 at 2:58 PM, Eric Dumazet <eric.dumazet@...il.com> wrote:
> >
> >
> > On 03/09/2018 02:56 PM, Eric Dumazet wrote:
> >
> >>
> >> I sent a patch a while back, but Pablo/Florian wanted more than that
> >> simple fix.
> >>
> >> We also need to filter special characters like '/'
> 
> proc_create_data() itself accepts '/', so it must be xt_hashlimit doesn't
> want it.

--hashimit-name / also triggers WARN for me.
. or .. "work", (no crash), but cause appearance of 2nd ./.. in
/proc/net/ipt_hashlimit , so I think its better to disallow that too.