From a5a6cf8c405e826ff7ed1308dde72560c0ed4854 Mon Sep 17 00:00:00 2001 From: willy tarreau Date: Sun, 10 Jan 2016 07:54:56 +0100 Subject: [PATCH] unix: properly account for FDs passed over unix sockets commit 712f4aad406bb1ed67f3f98d04c044191f0ff593 upstream. 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@gmail.com Reported-by: Tetsuo Handa Mitigates: CVE-2013-4312 (Linux 2.0+) Suggested-by: Linus Torvalds Acked-by: Hannes Frederic Sowa Signed-off-by: Willy Tarreau Signed-off-by: David S. Miller [carnil: Backported to 3.16: adjust context] Signed-off-by: Ben Hutchings --- Reading git-format-patch failed