linux-kernel - [ 02/48] Tools: hv: verify origin of netlink connector message

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Message-Id: <20120701172006.992250192@decadent.org.uk>
Date:	Sun, 01 Jul 2012 18:20:08 +0100
From:	Ben Hutchings <ben@...adent.org.uk>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
	alan@...rguk.ukuu.org.uk, Olaf Hering <olaf@...fle.de>,
	Marcus Meissner <meissner@...e.de>,
	Sebastian Krahmer <krahmer@...e.de>,
	"K. Y. Srinivasan" <kys@...rosoft.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: [ 02/48] Tools: hv: verify origin of netlink connector message

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

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

From: Olaf Hering <olaf@...fle.de>

commit bcc2c9c3fff859e0eb019fe6fec26f9b8eba795c upstream.

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

CVE-2012-2669

Signed-off-by: Olaf Hering <olaf@...fle.de>
Signed-off-by: Marcus Meissner <meissner@...e.de>
Signed-off-by: Sebastian Krahmer <krahmer@...e.de>
Signed-off-by: K. Y. Srinivasan <kys@...rosoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 tools/hv/hv_kvp_daemon.c |   10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/tools/hv/hv_kvp_daemon.c b/tools/hv/hv_kvp_daemon.c
index 146fd61..d9834b3 100644
--- a/tools/hv/hv_kvp_daemon.c
+++ b/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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