Add checking of space permissions and kernel space unique ID

autotest/client/hardware_TPMCheck/hardware_TPMCheck.py

 # Copyright (c) 2010 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.
 
-import os, re
+import logging, os, re
 from autotest_lib.client.bin import test, utils
 from autotest_lib.client.common_lib import error
 
+def old_or_missing_firmware_version():
+    f = open("/sys/devices/platform/chromeos_acpi/FWID")
+    if not f:
+        return True
+    version = f.readline().strip()
+    logging.info("firmware version: %s", version)
+    # Expect a dot-separated list of 6 elements.  Discard 1st element.
+    v = re.split("\.", version)[1:]
+    w = re.split("\.", "any-nickname.03.60.1118.0036.")[1:]
+    if len(v) != len(w):
+        raise error.TestError("malformed firmware version %s" % version)
+    return v < w
+
 def dict_from_command(command):
     dict = {}
     out = os.popen(command)
     for linecr in out.readlines():
         line = linecr.strip()
         match = re.match("([^ ]+) (.*)", line)
         k = match.group(1)
         v = match.group(2)
         dict[k] = v
     return dict
 
 def expect(d, key, value):
     if (d[key] != value):
-        utils.system("start tcsd", ignore_status=True)
-        raise error.TestError("expecting %s = %s, receiving %s = %s" %
+        raise error.TestError("expecting %s = %s, observing %s = %s" %
                               (key, value, key, d[key]))
 
+def checkp(space, permission):
+    c = "tpmc getp %s" % space
+    l = os.popen(c).readline()
+    if (not re.match(".*%s" % permission, l)):
+        raise error.TestError("invalid response to %s: %s" % (c, l))
+
 class hardware_TPMCheck(test.test):
     version = 1
 
     def run_once(self):
-        utils.system("stop tcsd", ignore_status=True)
 
-        d = dict_from_command("tpmc getvf");
-        expect(d, "deactivated", "0")
-        expect(d, "physicalPresence", "0")
-        expect(d, "physicalPresenceLock", "1")
-        expect(d, "bGlobalLock", "1")
+        if old_or_missing_firmware_version():
+            logging.warning("skipping test because firmware " +
+                            "version missing or deemed too old")
+            return
 
-        d = dict_from_command("tpmc getpf");
-        expect(d, "disable", "0")
-        expect(d, "ownership", "1")
-        expect(d, "deactivated", "0")
-        expect(d, "physicalPresenceHWEnable", "0")
-        expect(d, "physicalPresenceCMDEnable", "1")
-        expect(d, "physicalPresenceLifetimeLock", "1")
-        expect(d, "nvLocked", "1")
+        try:
+            utils.system("stop tcsd", ignore_status=True)
 
-        utils.system("start tcsd", ignore_status=True)
+            # Check volatile (ST_CLEAR) flags
+            d = dict_from_command("tpmc getvf");
+            expect(d, "deactivated", "0")
+            expect(d, "physicalPresence", "0")
+            expect(d, "physicalPresenceLock", "1")
+            expect(d, "bGlobalLock", "1")
+
+            # Check permanent flags
+            d = dict_from_command("tpmc getpf");
+            expect(d, "disable", "0")
+            expect(d, "ownership", "1")
+            expect(d, "deactivated", "0")
+            expect(d, "physicalPresenceHWEnable", "0")
+            expect(d, "physicalPresenceCMDEnable", "1")
+            expect(d, "physicalPresenceLifetimeLock", "1")
+            expect(d, "nvLocked", "1")
+
+            # Check space permissions
+            checkp("0x1007", "0x8001")
+            checkp("0x1008", "0x1")
+
+            # Check kernel space UID
+            l = os.popen("tpmc read 0x1008 0x5").readline()
+            if (not re.match(".* 4c 57 52 47$", l)):
+                raise error.TestError("invalid kernel space UID: %s" % l)
+
+        finally:
+            utils.system("start tcsd", ignore_status=True)