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Date: Mon, 08 Feb 2016 10:32:27 -0500 (EST) From: David Miller <davem@...emloft.net> To: hannes@...essinduktion.org Cc: netdev@...r.kernel.org, dh.herrmann@...il.com, w@....eu, torvalds@...ux-foundation.org Subject: Re: [PATCH net] unix: correctly track in-flight fds in sending process user_struct From: Hannes Frederic Sowa <hannes@...essinduktion.org> 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 <dh.herrmann@...il.com> > Cc: David Herrmann <dh.herrmann@...il.com> > Cc: Willy Tarreau <w@....eu> > Cc: Linus Torvalds <torvalds@...ux-foundation.org> > Suggested-by: Linus Torvalds <torvalds@...ux-foundation.org> > Signed-off-by: Hannes Frederic Sowa <hannes@...essinduktion.org> Applied, thanks Hannes.
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