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Message-ID: <56829D4D.4090109@stressinduktion.org> Date: Tue, 29 Dec 2015 15:48:45 +0100 From: Hannes Frederic Sowa <hannes@...essinduktion.org> To: Willy Tarreau <w@....eu>, "David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org, linux-kernel@...r.kernel.org Cc: Linus Torvalds <torvalds@...ux-foundation.org>, Eric Dumazet <edumazet@...gle.com>, socketpair@...il.com Subject: Re: [PATCH] unix: properly account for FDs passed over unix sockets On 28.12.2015 15:14, Willy Tarreau wrote: > 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 > Suggested-by: Linus Torvalds <torvalds@...ux-foundation.org> > Signed-off-by: Willy Tarreau <w@....eu> Thanks for the patch! I think this does not close the DoS attack completely as we duplicate fds if the reader uses MSG_PEEK on the unix domain socket and thus clones the fd. Have I overlooked something? Thanks, Hannes -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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