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

[David Miller]

From: Willy Tarreau <w@xxxxxx>
Date: Mon, 28 Dec 2015 15:14:35 +0100

> 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@xxxxxxxxx
> Suggested-by: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
> Signed-off-by: Willy Tarreau <w@xxxxxx>
> ---
> It would be nice if (if accepted) it would be backported to -stable as the
> issue is currently exploitable.

As mentioned, please remove the unix_sock_count variable and
associated code as it is completely unused after this patch.
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