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Date:	Mon, 08 Feb 2016 10:32:27 -0500 (EST)
From:	David Miller <>
Subject: Re: [PATCH net] unix: correctly track in-flight fds in sending
 process user_struct

From: Hannes Frederic Sowa <>
Date: Wed,  3 Feb 2016 02:11:03 +0100

> The commit referenced in the Fixes tag incorrectly accounted the number
> of in-flight fds over a unix domain socket to the original opener
> of the file-descriptor. This allows another process to arbitrary
> deplete the original file-openers resource limit for the maximum of
> open files. Instead the sending processes and its struct cred should
> be credited.
> To do so, we add a reference counted struct user_struct pointer to the
> scm_fp_list and use it to account for the number of inflight unix fds.
> Fixes: 712f4aad406bb1 ("unix: properly account for FDs passed over unix sockets")
> Reported-by: David Herrmann <>
> Cc: David Herrmann <>
> Cc: Willy Tarreau <>
> Cc: Linus Torvalds <>
> Suggested-by: Linus Torvalds <>
> Signed-off-by: Hannes Frederic Sowa <>

Applied, thanks Hannes.

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