JRE-458 added new regression test (Insufficient and inconsistent permissions on some files in Linux build)

(cherry picked from commit 82adbe9c25)

test/jdk/jb/build/permissions458.sh

@@ -0,0 +1,22 @@
+#!/usr/bin/env bash
+
+# @test
+# @summary permissions458.sh checks readability permissions of JDK build
+# @run shell permissions458.sh
+
+if [ -z "${TESTJAVA}" ]; then
+  echo "TESTJAVA undefined: testing cancelled"
+  exit 1
+fi
+
+FIND="/usr/bin/find"
+files=$(${FIND} ${TESTJAVA} -not -perm -444)
+if [ $? != 0 ]; then
+    echo "Command failed."
+    exit 1
+elif [ "$files" ]; then
+    echo "Files with no readability permissions:"
+    ls -l $files
+    echo "\nTest failed"
+    exit 1
+fi