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] [thread-next>] [day] [month] [year] [list]
Date:	Thu, 31 Dec 2015 15:08:53 +0900
From:	Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>
To:	w@....eu, hannes@...essinduktion.org
Cc:	davem@...emloft.net, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, torvalds@...ux-foundation.org,
	edumazet@...gle.com, socketpair@...il.com
Subject: Re: [PATCH] unix: properly account for FDs passed over unix sockets

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@...ove.SAKURA.ne.jp>
Mitigates: CVE-2013-4312 (Linux 2.0+)
--
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html

Powered by blists - more mailing lists