linux-kernel - [PATCH 4.4 22/28] Tools: hv: kvp: ensure kvp device fd is closed on exec

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Date:   Tue, 25 Apr 2017 16:08:53 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Vitaly Kuznetsov <vkuznets@...hat.com>,
        "K. Y. Srinivasan" <kys@...rosoft.com>,
        Sumit Semwal <sumit.semwal@...aro.org>
Subject: [PATCH 4.4 22/28] Tools: hv: kvp: ensure kvp device fd is closed on exec

4.4-stable review patch.  If anyone has any objections, please let me know.

------------------

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

commit 26840437cbd6d3625ea6ab34e17cd34bb810c861 upstream.

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>
Signed-off-by: Sumit Semwal <sumit.semwal@...aro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 tools/hv/hv_kvp_daemon.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- 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",