Update with note.

run_tests.sh

 #!/bin/bash
 
 # Copyright (c) 2009 The Chromium OS Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 # Load common constants.  This should be the first executable line.
 # The path to common.sh should be relative to your script's location.
 . "$(dirname "$0")/common.sh"
 
@@ skipping 33 matching lines @@
 function cleanup() {
   cd -
   rm -rf $TEST_CWD
   trap - 0
 }
 
 trap cleanup ERR 0
 
 # NOTE: We currently skip cryptohome_tests (which happens to have a different
 # suffix than the other tests), because it doesn't work.
+# NOTE: Removed explicit use of the target board's ld-linux.so.2 so that this
+# will work on hardened builds (with PIE on by default).  Tests pass on
+# hardened and non-hardened builds without this explicit use, but we only
+# disable this on hardened, since that is where the PIE conflict happens.
 for i in ${TESTS_DIR}/*_{test,unittests}; do
   if [[ "`file -b $i`" = "POSIX shell script text executable" ]]; then
-    LD_LIBRARY_PATH=$LD_LIBRARY_PATH /build/${FLAGS_board}/lib/ld-linux.so.2 /build/${FLAGS_board}/bin/bash $i
+    if [[ -f /etc/hardened ]]; then
+      LD_LIBRARY_PATH=$LD_LIBRARY_PATH /build/${FLAGS_board}/bin/bash $i
+    else
+      LD_LIBRARY_PATH=$LD_LIBRARY_PATH /build/${FLAGS_board}/lib/ld-linux.so.2 /build/${FLAGS_board}/bin/bash $i
+    fi
   else
-    LD_LIBRARY_PATH=$LD_LIBRARY_PATH /build/${FLAGS_board}/lib/ld-linux.so.2 $i
+    if [[ -f /etc/hardened ]]; then
+      LD_LIBRARY_PATH=$LD_LIBRARY_PATH $i
+    else
+      LD_LIBRARY_PATH=$LD_LIBRARY_PATH /build/${FLAGS_board}/lib/ld-linux.so.2 $i
+    fi
   fi
 done
+
+