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

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Date:	Mon, 11 Jan 2016 00:05:55 -0500 (EST)
From:	David Miller <davem@...emloft.net>
To:	w@....eu
Cc:	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	torvalds@...ux-foundation.org, edumazet@...gle.com,
	hannes@...essinduktion.org, socketpair@...il.com,
	penguin-kernel@...ove.SAKURA.ne.jp
Subject: Re: [PATCH v2] unix: properly account for FDs passed over unix
 sockets

From: Willy Tarreau <w@....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@...il.com
> Reported-by: Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>
> Mitigates: CVE-2013-4312 (Linux 2.0+)
> Suggested-by: Linus Torvalds <torvalds@...ux-foundation.org>
> Acked-by: Hannes Frederic Sowa <hannes@...essinduktion.org>
> Signed-off-by: Willy Tarreau <w@....eu>

Applied and queued up for -stable, thanks!