From: Olaf Hering <[mailto:o...@aepfle.de]>
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 <o...@aepfle.de>
Signed-off-by: K. Y. Srinivasan <k...@microsoft.com>
---
tools/hv/hv_vss_daemon.c | 8 +++++++-
1 files changed, 7 insertions(+), 1 deletions(-)
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)
--
1.7.4.1
--
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