Re: [PATCH v2] unix: properly account for FDs passed over unix sockets

From	David Miller <davem@davemloft.net>
Newsgroups	linux.kernel
Subject	Re: [PATCH v2] unix: properly account for FDs passed over unix sockets
Date	2016-01-11 06:10 +0100
Message-ID	<qPCTU-6aR-9@gated-at.bofh.it> (permalink)
References	<qPi8O-Fk-11@gated-at.bofh.it>
Organization	linux.* mail to news gateway

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From: Willy Tarreau <w@1wt.eu>
Date: Sun, Jan 10 07:54:56 CET 2016

> It is possible for a process to allocate and accumulate far more FDs than
> the process' limit by sending them over a unix socket then closing them
> to keep the process' fd count low.
> 
> This change addresses this problem by keeping track of the number of FDs
> in flight per user and preventing non-privileged processes from having
> more FDs in flight than their configured FD limit.
> 
> Reported-by: socketpair@gmail.com
> Reported-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
> Mitigates: CVE-2013-4312 (Linux 2.0+)
> Suggested-by: Linus Torvalds <torvalds@linux-foundation.org>
> Acked-by: Hannes Frederic Sowa <hannes@stressinduktion.org>
> Signed-off-by: Willy Tarreau <w@1wt.eu>

Applied and queued up for -stable, thanks!

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[PATCH v2] unix: properly account for FDs passed over unix sockets Willy Tarreau <w@1wt.eu> - 2016-01-10 08:00 +0100
  Re: [PATCH v2] unix: properly account for FDs passed over unix  sockets David Miller <davem@davemloft.net> - 2016-01-11 06:10 +0100

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