From: Cong Wang <xiyou.wangcong@gmail.com>
To: Mateusz Guzik <mguzik@redhat.com>
Cc: Dmitry Vyukov <dvyukov@google.com>,
Al Viro <viro@zeniv.linux.org.uk>,
"linux-fsdevel@vger.kernel.org" <linux-fsdevel@vger.kernel.org>,
LKML <linux-kernel@vger.kernel.org>,
David Miller <davem@davemloft.net>,
Rainer Weikusat <rweikusat@mobileactivedefense.com>,
Hannes Frederic Sowa <hannes@stressinduktion.org>,
netdev <netdev@vger.kernel.org>,
Eric Dumazet <edumazet@google.com>,
syzkaller <syzkaller@googlegroups.com>
Subject: Re: fs, net: deadlock between bind/splice on af_unix
Date: Thu, 9 Feb 2017 17:37:56 -0800 [thread overview]
Message-ID: <CAM_iQpUibPgC6kW2JmkhmPneZ6p7z6QjYdAQ8ng+pxtiWJ7xVA@mail.gmail.com> (raw)
In-Reply-To: <20170207142035.vfnyrbggb6kbfzgd@dhcp-1-212.brq.redhat.com>
On Tue, Feb 7, 2017 at 6:20 AM, Mateusz Guzik <mguzik@redhat.com> wrote:
>
> Yes, but unix_release_sock is expected to leave the file behind.
> Note I'm not claiming there is a leak, but that racing threads will be
> able to trigger a condition where you create a file and fail to bind it.
>
Which is expected, right? No one guarantees the success of file
creation is the success of bind, the previous code does but it is not
part of API AFAIK. Should a sane user-space application check
the file creation for a successful bind() or just check its return value?
> What to do with the file now?
>
We just do what unix_release_sock() does, so why do you keep
asking the same question?
If you still complain about the race with user-space, think about the
same race in-between a successful bind() and close(), nothing is new.
next prev parent reply other threads:[~2017-02-10 1:38 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-12-08 14:47 fs, net: deadlock between bind/splice on af_unix Dmitry Vyukov
2016-12-08 16:30 ` Dmitry Vyukov
2016-12-09 0:08 ` Cong Wang
2016-12-09 1:32 ` Al Viro
2016-12-09 6:32 ` Cong Wang
2016-12-09 6:41 ` Al Viro
2017-01-16 9:32 ` Dmitry Vyukov
2017-01-17 21:21 ` Cong Wang
2017-01-18 9:17 ` Dmitry Vyukov
2017-01-20 4:57 ` Cong Wang
2017-01-20 22:52 ` Dmitry Vyukov
2017-01-23 19:00 ` Cong Wang
2017-01-26 23:29 ` Mateusz Guzik
2017-01-27 5:11 ` Cong Wang
2017-01-27 6:41 ` Mateusz Guzik
2017-01-31 6:44 ` Cong Wang
2017-01-31 18:14 ` Mateusz Guzik
2017-02-06 7:22 ` Cong Wang
2017-02-07 14:20 ` Mateusz Guzik
2017-02-10 1:37 ` Cong Wang [this message]
2017-01-17 8:07 ` Eric W. Biederman
[not found] ` <065031f0-27c5-443d-82f9-2f475fcef8c3@googlegroups.com>
2017-06-23 16:30 ` Cong Wang
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