linux-kernel - [PATCH v4 2/2] selftests: tpm2: Reset the dictionary attack lock

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Date:   Sat, 27 Nov 2021 23:10:52 -0500
From:   Stefan Berger <stefanb@...ux.vnet.ibm.com>
To:     jarkko@...nel.org, linux-integrity@...r.kernel.org
Cc:     peterhuewe@....de, linux-kernel@...r.kernel.org,
        linux-kselftest@...r.kernel.org, skhan@...uxfoundation.org,
        Stefan Berger <stefanb@...ux.ibm.com>
Subject: [PATCH v4 2/2] selftests: tpm2: Reset the dictionary attack lock

From: Stefan Berger <stefanb@...ux.ibm.com>

Reset the dictionary attack lock to avoid the following types of test
failures after running the test 2 times:

======================================================================
ERROR: test_unseal_with_wrong_policy (tpm2_tests.SmokeTest)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/root/linux-ima-namespaces/tools/testing/selftests/tpm2/tpm2_tests.py", line 105, in test_unseal_with_wrong_policy
    blob = self.client.seal(self.root_key, data, auth, policy_dig)
  File "/root/linux-ima-namespaces/tools/testing/selftests/tpm2/tpm2.py", line 620, in seal
    rsp = self.send_cmd(cmd)
  File "/root/linux-ima-namespaces/tools/testing/selftests/tpm2/tpm2.py", line 397, in send_cmd
    raise ProtocolError(cc, rc)
tpm2.ProtocolError: TPM_RC_LOCKOUT: cc=0x00000153, rc=0x00000921

Signed-off-by: Stefan Berger <stefanb@...ux.ibm.com>
---
 tools/testing/selftests/tpm2/tpm2_tests.py | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/tools/testing/selftests/tpm2/tpm2_tests.py b/tools/testing/selftests/tpm2/tpm2_tests.py
index e63a37819978..ad6f54c01adf 100644
--- a/tools/testing/selftests/tpm2/tpm2_tests.py
+++ b/tools/testing/selftests/tpm2/tpm2_tests.py
@@ -139,6 +139,8 @@ class SmokeTest(unittest.TestCase):
         except:
             self.client.flush_context(handle)
             raise
+        finally:
+            self.client.reset_da_lock()
 
         self.assertEqual(rc, tpm2.TPM2_RC_POLICY_FAIL)
 
-- 
2.31.1