linux-kernel - [PATCH 2/3] tools: hv: fix checks for origin of netlink message in hv_vss

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Message-Id: <1364311709-18228-2-git-send-email-olaf@aepfle.de>
Date:	Tue, 26 Mar 2013 16:28:28 +0100
From:	Olaf Hering <olaf@...fle.de>
To:	kys@...rosoft.com, gregkh@...uxfoundation.org
Cc:	linux-kernel@...r.kernel.org, Olaf Hering <olaf@...fle.de>
Subject: [PATCH 2/3] tools: hv: fix checks for origin of netlink message in hv_vss_daemon

Similar to what commit 95a69adab9acfc3981c504737a2b6578e4d846ef ("tools:
hv: Netlink source address validation allows DoS") does in
hv_kvp_daemon, improve checks for origin of netlink connector message.

Signed-off-by: Olaf Hering <olaf@...fle.de>
---
 tools/hv/hv_vss_daemon.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/tools/hv/hv_vss_daemon.c b/tools/hv/hv_vss_daemon.c
index 2a03d0b..dc3eb1e 100644
--- a/tools/hv/hv_vss_daemon.c
+++ b/tools/hv/hv_vss_daemon.c
@@ -186,13 +186,19 @@ int main(void)
 		len = recvfrom(fd, vss_recv_buffer, sizeof(vss_recv_buffer), 0,
 				addr_p, &addr_l);
 
-		if (len < 0 || addr.nl_pid) {
+		if (len < 0) {
 			syslog(LOG_ERR, "recvfrom failed; pid:%u error:%d %s",
 					addr.nl_pid, errno, strerror(errno));
 			close(fd);
 			return -1;
 		}
 
+		if (addr.nl_pid) {
+			syslog(LOG_WARNING, "Received packet from untrusted pid:%u",
+					addr.nl_pid);
+			continue;
+		}
+
 		incoming_msg = (struct nlmsghdr *)vss_recv_buffer;
 
 		if (incoming_msg->nlmsg_type != NLMSG_DONE)
--
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