commit d2d6bf864e52af8491a60dd507f85b74361f5da3
author djm@openbsd.org <djm@openbsd.org> Fri Apr 29 08:07:53 2016 +0000
committer Damien Miller <djm@mindrot.org> Fri Apr 29 18:09:02 2016 +1000
tree aee80e780864479d2b477f7698adeecd47c5a5e8
parent 9ee692fa1146e887e008a2b9a3d3ea81770c9fc8

upstream commit

close ControlPersist background process stderr when not
 in debug mode or when logging to a file or syslog. bz#1988 ok dtucker

Upstream-ID: 4fb726f0fdcb155ad419913cea10dc4afd409d24

log.c

diff --git a/log.c b/log.c
index ad12930..277afda 100644
--- a/log.c
+++ b/log.c
@@ -1,4 +1,4 @@
-/* $OpenBSD: log.c,v 1.46 2015/07/08 19:04:21 markus Exp $ */
+/* $OpenBSD: log.c,v 1.47 2016/04/29 08:07:53 djm Exp $ */
 /*
  * Author: Tatu Ylonen <ylo@cs.hut.fi>
  * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
@@ -342,7 +342,7 @@
 int
 log_is_on_stderr(void)
 {
-	return log_on_stderr;
+	return log_on_stderr && log_stderr_fd == STDERR_FILENO;
 }
 
 /* redirect what would usually get written to stderr to specified file */

ssh.c

diff --git a/ssh.c b/ssh.c
index a999d50..a881ba1 100644
--- a/ssh.c
+++ b/ssh.c
@@ -1,4 +1,4 @@
-/* $OpenBSD: ssh.c,v 1.437 2016/03/07 19:02:43 djm Exp $ */
+/* $OpenBSD: ssh.c,v 1.438 2016/04/29 08:07:53 djm Exp $ */
 /*
  * Author: Tatu Ylonen <ylo@cs.hut.fi>
  * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
@@ -1395,7 +1395,7 @@
 control_persist_detach(void)
 {
 	pid_t pid;
-	int devnull;
+	int devnull, keep_stderr;
 
 	debug("%s: backgrounding master process", __func__);
 
@@ -1426,8 +1426,10 @@
 		error("%s: open(\"/dev/null\"): %s", __func__,
 		    strerror(errno));
 	} else {
+		keep_stderr = log_is_on_stderr() && debug_flag;
 		if (dup2(devnull, STDIN_FILENO) == -1 ||
-		    dup2(devnull, STDOUT_FILENO) == -1)
+		    dup2(devnull, STDOUT_FILENO) == -1 ||
+		    (!keep_stderr && dup2(devnull, STDERR_FILENO) == -1))
 			error("%s: dup2: %s", __func__, strerror(errno));
 		if (devnull > STDERR_FILENO)
 			close(devnull);