From d2d6bf864e52af8491a60dd507f85b74361f5da3 Mon Sep 17 00:00:00 2001 From: "djm@openbsd.org" Date: Fri, 29 Apr 2016 08:07:53 +0000 Subject: [PATCH] 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 | 4 ++-- ssh.c | 8 +++++--- 2 files changed, 7 insertions(+), 5 deletions(-) diff --git a/log.c b/log.c index ad12930..277afda 100644 --- a/log.c +++ b/log.c @@ -342,7 +342,7 @@ log_change_level(LogLevel new_log_level) 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 */ diff --git a/ssh.c b/ssh.c index a999d50..a881ba1 100644 --- a/ssh.c +++ b/ssh.c @@ -1395,7 +1395,7 @@ static void control_persist_detach(void) { pid_t pid; - int devnull; + int devnull, keep_stderr; debug("%s: backgrounding master process", __func__); @@ -1426,8 +1426,10 @@ control_persist_detach(void) 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);