linux-kernel - [PATCH] Tools: hv: verify origin of netlink connector message

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Message-ID: <20120531144006.GA24592@aepfle.de>
Date:	Thu, 31 May 2012 16:40:06 +0200
From:	Olaf Hering <olaf@...fle.de>
To:	"K. Y. Srinivasan" <kys@...rosoft.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:	linux-kernel@...r.kernel.org
Subject: [PATCH] Tools: hv: verify origin of netlink connector message

The SuSE security team suggested to use recvfrom instead of recv to be
certain that the connector message is originated from kernel.

Signed-off-by: Olaf Hering <olaf@...fle.de>

---
 tools/hv/hv_kvp_daemon.c |   10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

Index: linux-3.4/tools/hv/hv_kvp_daemon.c
===================================================================
--- linux-3.4.orig/tools/hv/hv_kvp_daemon.c
+++ linux-3.4/tools/hv/hv_kvp_daemon.c
@@ -701,14 +701,18 @@ int main(void)
 	pfd.fd = fd;
 
 	while (1) {
+		struct sockaddr *addr_p = (struct sockaddr *) &addr;
+		socklen_t addr_l = sizeof(addr);
 		pfd.events = POLLIN;
 		pfd.revents = 0;
 		poll(&pfd, 1, -1);
 
-		len = recv(fd, kvp_recv_buffer, sizeof(kvp_recv_buffer), 0);
+		len = recvfrom(fd, kvp_recv_buffer, sizeof(kvp_recv_buffer), 0,
+				addr_p, &addr_l);
 
-		if (len < 0) {
-			syslog(LOG_ERR, "recv failed; error:%d", len);
+		if (len < 0 || addr.nl_pid) {
+			syslog(LOG_ERR, "recvfrom failed; pid:%u error:%d %s",
+					addr.nl_pid, errno, strerror(errno));
 			close(fd);
 			return -1;
 		}
--
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