linux-kernel - [PATCH 1/1] Tools: hv: kvp: ensure kvp device fd is closed on exec

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Message-Id: <1467854650-9554-1-git-send-email-kys@exchange.microsoft.com>
Date:	Wed,  6 Jul 2016 18:24:10 -0700
From:	kys@...hange.microsoft.com
To:	gregkh@...uxfoundation.org, linux-kernel@...r.kernel.org,
	devel@...uxdriverproject.org, olaf@...fle.de, apw@...onical.com,
	vkuznets@...hat.com, jasowang@...hat.com,
	leann.ogasawara@...onical.com
Cc:	"K. Y. Srinivasan" <kys@...rosoft.com>
Subject: [PATCH 1/1] Tools: hv: kvp: ensure kvp device fd is closed on exec

From: Vitaly Kuznetsov <vkuznets@...hat.com>

KVP daemon does fork()/exec() (with popen()) so we need to close our fds
to avoid sharing them with child processes. The immediate implication of
not doing so I see is SELinux complaining about 'ip' trying to access
'/dev/vmbus/hv_kvp'.

Signed-off-by: Vitaly Kuznetsov <vkuznets@...hat.com>
Signed-off-by: K. Y. Srinivasan <kys@...rosoft.com>
---
 tools/hv/hv_kvp_daemon.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/tools/hv/hv_kvp_daemon.c b/tools/hv/hv_kvp_daemon.c
index 0d9f48e..bc7adb8 100644
--- a/tools/hv/hv_kvp_daemon.c
+++ b/tools/hv/hv_kvp_daemon.c
@@ -1433,7 +1433,7 @@ int main(int argc, char *argv[])
 	openlog("KVP", 0, LOG_USER);
 	syslog(LOG_INFO, "KVP starting; pid is:%d", getpid());
 
-	kvp_fd = open("/dev/vmbus/hv_kvp", O_RDWR);
+	kvp_fd = open("/dev/vmbus/hv_kvp", O_RDWR | O_CLOEXEC);
 
 	if (kvp_fd < 0) {
 		syslog(LOG_ERR, "open /dev/vmbus/hv_kvp failed; error: %d %s",
-- 
1.7.4.1