* Added a test that make sure that users cannot register

specially-crafted derivations that produce output paths belonging to
  other derivations.  This could be used to inject malware into the
  store.

tests/secure-drv-outputs.sh

@@ -0,0 +1,37 @@
+# Test that users cannot register specially-crafted derivations that
+# produce output paths belonging to other derivations.  This could be
+# used to inject malware into the store.
+
+source common.sh
+
+clearStore
+clearManifests
+
+startDaemon
+
+# Determine the output path of the "good" derivation.
+goodOut=$($nixstore -q $($nixinstantiate ./secure-drv-outputs.nix -A good))
+
+# Instantiate the "bad" derivation.
+badDrv=$($nixinstantiate ./secure-drv-outputs.nix -A bad)
+badOut=$($nixstore -q $badDrv)
+
+# Rewrite the bad derivation to produce the output path of the good
+# derivation.
+rm -f $TEST_ROOT/bad.drv
+sed -e "s|$badOut|$goodOut|g" < $badDrv > $TEST_ROOT/bad.drv
+
+# Add the manipulated derivation to the store and build it.  This
+# should fail.
+if badDrv2=$($nixstore --add $TEST_ROOT/bad.drv); then
+    $nixstore -r "$badDrv2"
+fi
+
+# Now build the good derivation.
+goodOut2=$($nixbuild ./secure-drv-outputs.nix -A good)
+test "$goodOut" = "$goodOut2"
+
+if ! test -e "$goodOut"/good; then
+    echo "Bad derivation stole the output path of the good derivation!"
+    exit 1
+fi