[PATCH v2 3/4] getentropy: Add test.

Christian Mauderer christian.mauderer at embedded-brains.de
Mon Nov 13 08:21:30 UTC 2017


From: Christian Mauderer <Christian.Mauderer at embedded-brains.de>

---
 testsuites/libtests/Makefile.am           |   1 +
 testsuites/libtests/configure.ac          |   1 +
 testsuites/libtests/random01/Makefile.am  |  19 ++++++
 testsuites/libtests/random01/init.c       | 105 ++++++++++++++++++++++++++++++
 testsuites/libtests/random01/random01.doc |  17 +++++
 testsuites/libtests/random01/random01.scn |   2 +
 6 files changed, 145 insertions(+)
 create mode 100644 testsuites/libtests/random01/Makefile.am
 create mode 100644 testsuites/libtests/random01/init.c
 create mode 100644 testsuites/libtests/random01/random01.doc
 create mode 100644 testsuites/libtests/random01/random01.scn

diff --git a/testsuites/libtests/Makefile.am b/testsuites/libtests/Makefile.am
index e72ca1bbaa..c9017301ce 100644
--- a/testsuites/libtests/Makefile.am
+++ b/testsuites/libtests/Makefile.am
@@ -54,6 +54,7 @@ _SUBDIRS += newlib01
 _SUBDIRS += putenvtest
 _SUBDIRS += pwdgrp01
 _SUBDIRS += pwdgrp02
+_SUBDIRS += random01
 _SUBDIRS += rbheap01
 _SUBDIRS += rtmonuse
 _SUBDIRS += sha
diff --git a/testsuites/libtests/configure.ac b/testsuites/libtests/configure.ac
index bbdf4df9d1..1a5e215f3b 100644
--- a/testsuites/libtests/configure.ac
+++ b/testsuites/libtests/configure.ac
@@ -155,6 +155,7 @@ newlib01/Makefile
 putenvtest/Makefile
 pwdgrp01/Makefile
 pwdgrp02/Makefile
+random01/Makefile
 rbheap01/Makefile
 rtmonuse/Makefile
 sha/Makefile
diff --git a/testsuites/libtests/random01/Makefile.am b/testsuites/libtests/random01/Makefile.am
new file mode 100644
index 0000000000..7c81fc1865
--- /dev/null
+++ b/testsuites/libtests/random01/Makefile.am
@@ -0,0 +1,19 @@
+rtems_tests_PROGRAMS = random01
+random01_SOURCES = init.c
+
+dist_rtems_tests_DATA = random01.scn random01.doc
+
+include $(RTEMS_ROOT)/make/custom/@RTEMS_BSP at .cfg
+include $(top_srcdir)/../automake/compile.am
+include $(top_srcdir)/../automake/leaf.am
+
+AM_CPPFLAGS += -I$(top_srcdir)/../support/include
+
+LINK_OBJS = $(random01_OBJECTS)
+LINK_LIBS = $(random01_LDLIBS)
+
+random01$(EXEEXT): $(random01_OBJECTS) $(random01_DEPENDENCIES)
+	@rm -f random01$(EXEEXT)
+	$(make-exe)
+
+include $(top_srcdir)/../automake/local.am
diff --git a/testsuites/libtests/random01/init.c b/testsuites/libtests/random01/init.c
new file mode 100644
index 0000000000..b874a497ee
--- /dev/null
+++ b/testsuites/libtests/random01/init.c
@@ -0,0 +1,105 @@
+/*
+ * Copyright (c) 2017 embedded brains GmbH.  All rights reserved.
+ *
+ *  embedded brains GmbH
+ *  Dornierstr. 4
+ *  82178 Puchheim
+ *  Germany
+ *  <rtems at embedded-brains.de>
+ *
+ * The license and distribution terms for this file may be
+ * found in the file LICENSE in this distribution or at
+ * http://www.rtems.org/license/LICENSE.
+ */
+
+#ifdef HAVE_CONFIG_H
+  #include "config.h"
+#endif
+
+#include "tmacros.h"
+
+#include <rtems.h>
+#include <unistd.h>
+#include <assert.h>
+
+const char rtems_test_name[] = "RANDOM 1";
+
+/* forward declarations to avoid warnings */
+static rtems_task Init(rtems_task_argument argument);
+
+#define TEST_MAX_BYTES 32
+#define TEST_GUARD_BYTES 32
+#define TEST_GUARD 0xA5
+
+static char entropy_buffer1 [TEST_MAX_BYTES + TEST_GUARD_BYTES];
+static char entropy_buffer2 [TEST_MAX_BYTES + TEST_GUARD_BYTES];
+static char guard_buffer [TEST_MAX_BYTES + TEST_GUARD_BYTES];
+
+static void test_getentropy(size_t nr_bytes)
+{
+  int rv;
+  size_t try = 1;
+
+  /*
+   * For very small patterns, the probability that two random patterns are the
+   * same is quite high. Therefore retry the test for these a few times.
+   */
+  if (nr_bytes < 4) {
+    try = 4;
+  }
+
+  do {
+    --try;
+
+    /* Fill buffers with guard pattern */
+    memset(entropy_buffer1, TEST_GUARD, sizeof(entropy_buffer1));
+    memset(entropy_buffer2, TEST_GUARD, sizeof(entropy_buffer2));
+    memset(guard_buffer, TEST_GUARD, sizeof(entropy_buffer2));
+
+    /* Get entropy with the given size */
+    rv = getentropy(entropy_buffer1, nr_bytes);
+    assert(rv == 0);
+    rv = getentropy(entropy_buffer2, nr_bytes);
+    assert(rv == 0);
+
+    /* Check guard pattern */
+    rv = memcmp(entropy_buffer1 + nr_bytes, guard_buffer + nr_bytes,
+        sizeof(entropy_buffer1) - nr_bytes);
+    assert(rv == 0);
+    rv = memcmp(entropy_buffer2 + nr_bytes, guard_buffer + nr_bytes,
+        sizeof(entropy_buffer2) - nr_bytes);
+    assert(rv == 0);
+
+    /* Make sure that buffers are not the same */
+    rv = memcmp(entropy_buffer1, entropy_buffer2, sizeof(entropy_buffer1));
+  } while (try > 0 && rv == 0);
+  assert(rv != 0);
+}
+
+static void Init(rtems_task_argument arg)
+{
+  volatile size_t i;
+
+  TEST_BEGIN();
+
+  for (i=1; i <= TEST_MAX_BYTES; ++i) {
+    test_getentropy(i);
+  }
+
+  TEST_END();
+
+  rtems_test_exit(0);
+}
+
+#define CONFIGURE_APPLICATION_DOES_NOT_NEED_CLOCK_DRIVER
+#define CONFIGURE_APPLICATION_NEEDS_CONSOLE_DRIVER
+
+#define CONFIGURE_MAXIMUM_TASKS 1
+
+#define CONFIGURE_INITIAL_EXTENSIONS RTEMS_TEST_INITIAL_EXTENSION
+
+#define CONFIGURE_RTEMS_INIT_TASKS_TABLE
+
+#define CONFIGURE_INIT
+
+#include <rtems/confdefs.h>
diff --git a/testsuites/libtests/random01/random01.doc b/testsuites/libtests/random01/random01.doc
new file mode 100644
index 0000000000..722c7ab63b
--- /dev/null
+++ b/testsuites/libtests/random01/random01.doc
@@ -0,0 +1,17 @@
+This file describes the directives and concepts tested by this test set.
+
+test set name: random01
+
+directives:
+
+  getentropy
+
+concepts:
+
+  Ensure that getentropy() works with different sizes of arrays and delivers
+  different values on multiple calls. It is mainly a check that the function
+  does anything at all and does not write over the end of the buffer.
+
+  Note that this test doesn't check any quality of the random numbers. If you
+  need some reliable information about quality you should use something like the
+  Diehard tests.
diff --git a/testsuites/libtests/random01/random01.scn b/testsuites/libtests/random01/random01.scn
new file mode 100644
index 0000000000..f8cd99f18b
--- /dev/null
+++ b/testsuites/libtests/random01/random01.scn
@@ -0,0 +1,2 @@
+*** TEST RANDOM 1 ***
+*** END OF TEST RANDOM 1 ***
-- 
2.12.3




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