Re: [PATCH] unix: properly account for FDs passed over unix sockets

From	Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Newsgroups	linux.kernel
Subject	Re: [PATCH] unix: properly account for FDs passed over unix sockets
Date	2015-12-31 07:10 +0100
Message-ID	<qLEAW-LM-1@gated-at.bofh.it> (permalink)
References	<qKGOu-3bZ-17@gated-at.bofh.it> <qL3L3-1P0-13@gated-at.bofh.it> <qL9dM-5lK-15@gated-at.bofh.it> <qLkLU-4kl-11@gated-at.bofh.it> <qLn73-5Wu-7@gated-at.bofh.it>
Organization	linux.* mail to news gateway

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Willy Tarreau wrote:
> On Wed, Dec 30, 2015 at 09:58:42AM +0100, Hannes Frederic Sowa wrote:
> > The MSG_PEEK code should not be harmful and the patch is good as is. I 
> > first understood from the published private thread, that it is possible 
> > for a program to exceed the rlimit of fds. But the DoS is only by 
> > keeping the fds in flight and not attaching them to any program.
> 
> Exactly. The real issue is when these FDs become very expensive such as
> pipes full of data.
> 

As you wrote how to abuse this vulnerability which exists in Linux 2.0
and later kernel, I quote a short description from private thread.

  "an unprivileged user consumes all file descriptors so that other
  unprivileged user cannot work" and "an unprivileged user consumes all
  kernel memory so that the OOM killer kills almost all processes before
  the culprit process is killed (CVE-2013-4312)".

Reported-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Mitigates: CVE-2013-4312 (Linux 2.0+)
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Thread

[PATCH] unix: properly account for FDs passed over unix sockets Willy Tarreau <w@1wt.eu> - 2015-12-28 15:20 +0100
  Re: [PATCH] unix: properly account for FDs passed over unix sockets Hannes Frederic Sowa <hannes@stressinduktion.org> - 2015-12-29 15:40 +0100
  Re: [PATCH] unix: properly account for FDs passed over unix sockets Hannes Frederic Sowa <hannes@stressinduktion.org> - 2015-12-29 15:50 +0100
    Re: [PATCH] unix: properly account for FDs passed over unix sockets Willy Tarreau <w@1wt.eu> - 2015-12-29 21:40 +0100
      Re: [PATCH] unix: properly account for FDs passed over unix sockets Hannes Frederic Sowa <hannes@stressinduktion.org> - 2015-12-30 10:00 +0100
        Re: [PATCH] unix: properly account for FDs passed over unix sockets Willy Tarreau <w@1wt.eu> - 2015-12-30 12:30 +0100
          Re: [PATCH] unix: properly account for FDs passed over unix sockets One Thousand Gnomes <gnomes@lxorguk.ukuu.org.uk> - 2015-12-30 14:20 +0100
          Re: [PATCH] unix: properly account for FDs passed over unix sockets Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp> - 2015-12-31 07:10 +0100
            Re: [PATCH] unix: properly account for FDs passed over unix sockets Willy Tarreau <w@1wt.eu> - 2015-12-31 08:20 +0100
              Re: [PATCH] unix: properly account for FDs passed over unix sockets One Thousand Gnomes <gnomes@lxorguk.ukuu.org.uk> - 2015-12-31 11:40 +0100
  Re: [PATCH] unix: properly account for FDs passed over unix sockets David Miller <davem@davemloft.net> - 2016-01-04 22:50 +0100

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