linux-kernel - Re: WARNING in proc

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Message-ID: <CACT4Y+bWzPydvGf264jnqg7jqPzsL5+by+hYVR1nMR=ffweWEg@mail.gmail.com>
Date:   Tue, 6 Feb 2018 15:28:28 +0100
From:   Dmitry Vyukov <dvyukov@...gle.com>
To:     Alexey Dobriyan <adobriyan@...il.com>
Cc:     syzbot <syzbot+75334212ef69a07c3209@...kaller.appspotmail.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Davidlohr Bueso <dave@...olabs.net>,
        David Howells <dhowells@...hat.com>, geliangtang@...il.com,
        hkallweit1@...il.com, LKML <linux-kernel@...r.kernel.org>,
        syzkaller-bugs@...glegroups.com, Takashi Iwai <tiwai@...e.de>,
        Al Viro <viro@...iv.linux.org.uk>
Subject: Re: WARNING in proc_register

On Tue, Feb 6, 2018 at 2:53 PM, Dmitry Vyukov <dvyukov@...gle.com> wrote:
> On Mon, Feb 5, 2018 at 8:41 PM, Alexey Dobriyan <adobriyan@...il.com> wrote:
>> On Mon, Feb 05, 2018 at 09:58:01AM -0800, syzbot wrote:
>>> proc_dir_entry 'ipt_CLUSTERIP/172.20.0.170' already registered
>>> WARNING: CPU: 1 PID: 4074 at fs/proc/generic.c:330
>>
>>>   proc_create_data+0xf8/0x180 fs/proc/generic.c:494
>>>   clusterip_config_init net/ipv4/netfilter/ipt_CLUSTERIP.c:250 [inline]
>>
>> Dima, this warning is never about /proc but always about some other code
>> registering duplicate /proc entry.
>>
>> I don't know how easily scriptable is mail sender but you want to look at
>> the second line in the backtrace.
>
> Hi Alexey,
>
> This is now fixed with:
> https://github.com/google/syzkaller/commit/645ce5da79c9654c314f0d12f4c11f2a94ec156b
> In particular tests for this report:
> https://github.com/google/syzkaller/blob/master/pkg/report/testdata/linux/report/181
> https://github.com/google/syzkaller/blob/master/pkg/report/testdata/linux/guilty/30
>
> Thanks for the suggestion.

As the result this now reappeared as "WARNING: proc registration bug
in clusterip_tg_check":
https://groups.google.com/forum/#!topic/syzkaller-bugs/gkFWUsDo0gw

#syz dup: WARNING: proc registration bug in clusterip_tg_check