netdev - Re: WARNING in __proc

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Date:   Fri, 9 Mar 2018 14:48:13 -0800
From:   Cong Wang <xiyou.wangcong@...il.com>
To:     syzbot <syzbot+0502b00edac2a0680b61@...kaller.appspotmail.com>
Cc:     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

On Fri, Mar 9, 2018 at 1:59 PM, syzbot
<syzbot+0502b00edac2a0680b61@...kaller.appspotmail.com> wrote:
> Hello,
>
> syzbot hit the following crash on net-next commit
> 617aebe6a97efa539cc4b8a52adccd89596e6be0 (Sun Feb 4 00:25:42 2018 +0000)
> Merge tag 'usercopy-v4.16-rc1' of
> git://git.kernel.org/pub/scm/linux/kernel/git/kees/linux
>
> So far this crash happened 12 times on net-next, upstream.
> C reproducer is attached.
> syzkaller reproducer is attached.
> Raw console output is attached.
> compiler: gcc (GCC) 7.1.1 20170620
> .config is attached.
>
> IMPORTANT: if you fix the bug, please add the following tag to the commit:
> Reported-by: syzbot+0502b00edac2a0680b61@...kaller.appspotmail.com
> It will help syzbot understand when the bug is fixed. See footer for
> details.
> If you forward the report, please keep this part and the footer.
>
> audit: type=1400 audit(1518223777.419:7): avc:  denied  { map } for
> pid=4159 comm="syzkaller598581" path="/root/syzkaller598581546" dev="sda1"
> ino=16481 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023
> tcontext=unconfined_u:object_r:user_home_t:s0 tclass=file permissive=1
> ------------[ cut here ]------------
> name len 0
> WARNING: CPU: 0 PID: 4159 at fs/proc/generic.c:354 __proc_create+0x696/0x880
> fs/proc/generic.c:354

We need to reject empty names.