KVM: x86: fix for buffer overflow in handling of MSR_KVM_SYSTEM_TIME (CVE-2013-1796)

[pandora-kernel.git] / tools / hv / hv_kvp_daemon.c

diff --git a/tools/hv/hv_kvp_daemon.c b/tools/hv/hv_kvp_daemon.c
index 0961d88..5e19410 100644 (file)
--- a/tools/hv/hv_kvp_daemon.c
+++ b/tools/hv/hv_kvp_daemon.c
@@ -393,13 +393,19 @@ int main(void)
                len = recvfrom(fd, kvp_recv_buffer, sizeof(kvp_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 *)kvp_recv_buffer;
                incoming_cn_msg = (struct cn_msg *)NLMSG_DATA(incoming_msg);