commit 8c3586ea755c40d5e01b22cb7b5c1e668cdec994
Author: Daniel P. Berrange <berrange@redhat.com>
Date:   Wed Oct 9 10:59:36 2013 +0100

    Only allow 'stderr' log output when running setuid (CVE-2013-4400)
    
    We must not allow file/syslog/journald log outputs when running
    setuid since they can be abused to do bad things. In particular
    the 'file' output can be used to overwrite files.
    
    Signed-off-by: Daniel P. Berrange <berrange@redhat.com>

Index: libvirt-1.1.2/src/util/virlog.c
===================================================================
--- libvirt-1.1.2.orig/src/util/virlog.c
+++ libvirt-1.1.2/src/util/virlog.c
@@ -1318,6 +1318,9 @@ int virLogPriorityFromSyslog(int priorit
  * Multiple output can be defined in a single @output, they just need to be
  * separated by spaces.
  *
+ * If running in setuid mode, then only the 'stderr' output will
+ * be allowed
+ *
  * Returns the number of output parsed and installed or -1 in case of error
  */
 int
@@ -1329,6 +1332,7 @@ virLogParseOutputs(const char *outputs)
     virLogPriority prio;
     int ret = -1;
     int count = 0;
+    bool isSUID = virIsSUID();
 
     if (cur == NULL)
         return -1;
@@ -1348,6 +1352,8 @@ virLogParseOutputs(const char *outputs)
             if (virLogAddOutputToStderr(prio) == 0)
                 count++;
         } else if (STREQLEN(cur, "syslog", 6)) {
+            if (isSUID)
+                goto cleanup;
             cur += 6;
             if (*cur != ':')
                 goto cleanup;
@@ -1365,6 +1371,8 @@ virLogParseOutputs(const char *outputs)
             VIR_FREE(name);
 #endif /* HAVE_SYSLOG_H */
         } else if (STREQLEN(cur, "file", 4)) {
+            if (isSUID)
+                goto cleanup;
             cur += 4;
             if (*cur != ':')
                 goto cleanup;
@@ -1385,6 +1393,8 @@ virLogParseOutputs(const char *outputs)
             VIR_FREE(name);
             VIR_FREE(abspath);
         } else if (STREQLEN(cur, "journald", 8)) {
+            if (isSUID)
+                goto cleanup;
             cur += 8;
 #if USE_JOURNALD
             if (virLogAddOutputToJournald(prio) == 0)