4582. [security] 'rndc ""' could trigger a assertion failure in named.

(CVE-2017-3138) [RT #44924]

(cherry picked from commit 8e8dfc5941)

bin/tests/system/rndc/tests.sh

@@ -557,5 +557,13 @@ EOF
     status=`expr $status + $ret`
 fi
 
+n=`expr $n + 1`
+echo "I:check 'rndc \"\"' is handled ($n)"
+ret=0
+$RNDCCMD "" > rndc.out.test$n 2>&1 && ret=1
+grep "rndc: '' failed: failure" rndc.out.test$n > /dev/null
+if [ $ret != 0 ]; then echo "I:failed"; fi
+status=`expr $status + $ret`
+
 echo "I:exit status: $status"
 [ $status -eq 0 ] || exit 1