File 0003-tpm2-Implement-more-TPM2-commands.patch of Package grub2

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File 0003-tpm2-Implement-more-TPM2-commands.patch of Package grub2 (Revision 9f54cdbdb7150b6725c00e026450479a)

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From a49c4dcbcb04078434f461ed3356c04042be461a Mon Sep 17 00:00:00 2001
From: Gary Lin <glin@suse.com>
Date: Wed, 8 Feb 2023 10:30:55 +0800
Subject: [PATCH 3/4] tpm2: Implement more TPM2 commands

This commit implements a few more TPM2 commands as the preparation for
the authorized policy support.

* TPM2_LoadExternal
  This command is added to load the external public key to verify the
  signed policy digest
* TPM2_HashSequenceStart, TPM2_SequenceUpdate, TPM2_SequenceComplete,
  and TPM2_Hash
  With those commands, we can use the TPM as a coprocessor to calculate
  the hash of a given binary blob.
* TPM2_VerifySignature
  This command verifies the given signature with the given public key
  and returns the validation ticket to authorize the policy.
* TPM2_PolicyAuthorize
  This command approves the given policy digest so that we can unseal
  the key with the newly authorized policy.

Signed-off-by: Gary Lin <glin@suse.com>
---
 grub-core/tpm2/tpm2.c                  | 424 +++++++++++++++++++++++++
 include/grub/tpm2/internal/functions.h |  57 ++++
 2 files changed, 481 insertions(+)

diff --git a/grub-core/tpm2/tpm2.c b/grub-core/tpm2/tpm2.c
index d67699a24..159353b08 100644
--- a/grub-core/tpm2/tpm2.c
+++ b/grub-core/tpm2/tpm2.c
@@ -427,6 +427,73 @@ TPM2_Load (const TPMI_DH_OBJECT parent_handle,
   return TPM_RC_SUCCESS;
 }
 
+TPM_RC
+TPM2_LoadExternal (const TPMS_AUTH_COMMAND *authCommand,
+                   const TPM2B_SENSITIVE *inPrivate,
+                   const TPM2B_PUBLIC *inPublic,
+                   const TPMI_RH_HIERARCHY hierarchy,
+                   TPM_HANDLE *objectHandle,
+                   TPM2B_NAME *name,
+                   TPMS_AUTH_RESPONSE *authResponse)
+{
+  TPM_RC rc;
+  struct grub_tpm2_buffer in;
+  struct grub_tpm2_buffer out;
+  TPM_HANDLE objectHandleTmp;
+  TPM2B_NAME nameTmp;
+  TPMS_AUTH_RESPONSE authResponseTmp;
+  TPMI_ST_COMMAND_TAG tag = authCommand ? TPM_ST_SESSIONS : TPM_ST_NO_SESSIONS;
+  TPM_RC responseCode;
+  grub_uint32_t param_size;
+
+  if (!inPublic)
+    return TPM_RC_VALUE;
+
+  if (!objectHandle)
+    objectHandle = &objectHandleTmp;
+  if (!name)
+    name = &nameTmp;
+  if (!authResponse)
+    authResponse = &authResponseTmp;
+
+  grub_memset (objectHandle, 0, sizeof (*objectHandle));
+  grub_memset (name, 0, sizeof (*name));
+  grub_memset (authResponse, 0, sizeof (*authResponse));
+
+  /* Marshal */
+  grub_tpm2_buffer_init (&in);
+  if (authCommand)
+    grub_tpm2_mu_TPMS_AUTH_COMMAND_Marshal (&in, authCommand);
+  if (inPrivate)
+    grub_tpm2_mu_TPM2B_SENSITIVE_Marshal (&in, inPrivate);
+  else
+    grub_tpm2_buffer_pack_u16 (&in, 0);
+  grub_tpm2_mu_TPM2B_PUBLIC_Marshal (&in, inPublic);
+  grub_tpm2_buffer_pack_u32 (&in, hierarchy);
+  if (in.error)
+    return TPM_RC_FAILURE;
+
+  /* Submit */
+  grub_tpm2_buffer_init (&out);
+  rc = grub_tpm2_submit_command (tag, TPM_CC_LoadExternal, &responseCode, &in, &out);
+  if (rc != TPM_RC_SUCCESS)
+    return rc;
+  if (responseCode != TPM_RC_SUCCESS)
+    return responseCode;
+
+  /* Unmarshal*/
+  grub_tpm2_buffer_unpack_u32 (&out, objectHandle);
+  if (tag == TPM_ST_SESSIONS)
+    grub_tpm2_buffer_unpack_u32 (&out, &param_size);
+  grub_tpm2_mu_TPM2B_Unmarshal (&out, (TPM2B*)name);
+  if (tag == TPM_ST_SESSIONS)
+    grub_tpm2_mu_TPMS_AUTH_RESPONSE_Unmarshal (&out, authResponse);
+  if (out.error)
+    return TPM_RC_FAILURE;
+
+  return TPM_RC_SUCCESS;
+}
+
 TPM_RC
 TPM2_Unseal (const TPMI_DH_OBJECT itemHandle,
 	     const TPMS_AUTH_COMMAND *authCommand,
@@ -759,3 +826,360 @@ TPM2_EvictControl (const TPMI_RH_PROVISION auth,
 
   return TPM_RC_SUCCESS;
 }
+
+TPM_RC
+TPM2_HashSequenceStart (const TPMS_AUTH_COMMAND *authCommand,
+                        const TPM2B_AUTH *auth,
+                        const TPMI_ALG_HASH hashAlg,
+                        TPMI_DH_OBJECT *sequenceHandle,
+                        TPMS_AUTH_RESPONSE *authResponse)
+{
+  struct grub_tpm2_buffer in;
+  struct grub_tpm2_buffer out;
+  TPMI_DH_OBJECT sequenceHandleTmp;
+  TPMS_AUTH_RESPONSE authResponseTmp;
+  TPMI_ST_COMMAND_TAG tag = authCommand ? TPM_ST_SESSIONS : TPM_ST_NO_SESSIONS;
+  TPM_RC responseCode;
+  TPM_RC rc;
+  grub_uint32_t parameterSize;
+
+  if (!auth)
+    return TPM_RC_VALUE;
+
+  if (!sequenceHandle)
+    sequenceHandle = &sequenceHandleTmp;
+  if (!authResponse)
+    authResponse = &authResponseTmp;
+
+  grub_memset (sequenceHandle, 0, sizeof (*sequenceHandle));
+  grub_memset (authResponse, 0, sizeof (*authResponse));
+
+  /* Marshal */
+  grub_tpm2_buffer_init (&in);
+  if (authCommand)
+    grub_tpm2_mu_TPMS_AUTH_COMMAND_Marshal (&in, authCommand);
+  grub_tpm2_mu_TPM2B_Marshal (&in, auth->size, auth->buffer);
+  grub_tpm2_buffer_pack_u16 (&in, hashAlg);
+  if (in.error)
+    return TPM_RC_FAILURE;
+
+  /* Submit */
+  grub_tpm2_buffer_init (&out);
+  rc = grub_tpm2_submit_command (tag, TPM_CC_HashSequenceStart, &responseCode, &in,
+                                 &out);
+  if (rc != TPM_RC_SUCCESS)
+    return rc;
+  if (responseCode != TPM_RC_SUCCESS)
+    return responseCode;
+
+  /* Unmarshal */
+  grub_tpm2_buffer_unpack_u32 (&out, sequenceHandle);
+  if (tag == TPM_ST_SESSIONS)
+    {
+      grub_tpm2_buffer_unpack_u32 (&out, &parameterSize);
+      grub_tpm2_mu_TPMS_AUTH_RESPONSE_Unmarshal(&out, authResponse);
+    }
+  if (out.error)
+    return TPM_RC_FAILURE;
+
+  return TPM_RC_SUCCESS;
+}
+
+TPM_RC
+TPM2_SequenceUpdate (const TPMI_DH_OBJECT sequenceHandle,
+                     const TPMS_AUTH_COMMAND *authCommand,
+                     const TPM2B_MAX_BUFFER *buffer,
+                     TPMS_AUTH_RESPONSE *authResponse)
+{
+  struct grub_tpm2_buffer in;
+  struct grub_tpm2_buffer out;
+  TPMS_AUTH_RESPONSE authResponseTmp;
+  TPM_RC responseCode;
+  TPM_RC rc;
+  grub_uint32_t parameterSize;
+
+  if (!authCommand)
+    return TPM_RC_VALUE;
+
+  if (!authResponse)
+    authResponse = &authResponseTmp;
+
+  grub_memset (authResponse, 0, sizeof (*authResponse));
+
+  /* Marshal */
+  grub_tpm2_buffer_init (&in);
+  grub_tpm2_buffer_pack_u32 (&in, sequenceHandle);
+  grub_tpm2_mu_TPMS_AUTH_COMMAND_Marshal (&in, authCommand);
+  if (buffer)
+    grub_tpm2_mu_TPM2B_Marshal (&in, buffer->size, buffer->buffer);
+  else
+    grub_tpm2_buffer_pack_u16 (&in, 0);
+  if (in.error)
+    return TPM_RC_FAILURE;
+
+  /* Submit */
+  grub_tpm2_buffer_init (&out);
+  rc = grub_tpm2_submit_command (TPM_ST_SESSIONS, TPM_CC_SequenceUpdate,
+                                 &responseCode, &in, &out);
+  if (rc != TPM_RC_SUCCESS)
+    return rc;
+  if (responseCode != TPM_RC_SUCCESS)
+    return responseCode;
+
+  /* Unmarshal */
+  grub_tpm2_buffer_unpack_u32 (&out, &parameterSize);
+  grub_tpm2_mu_TPMS_AUTH_RESPONSE_Unmarshal(&out, authResponse);
+  if (out.error)
+    return TPM_RC_FAILURE;
+
+  return TPM_RC_SUCCESS;
+}
+
+TPM_RC
+TPM2_SequenceComplete (const TPMI_DH_OBJECT sequenceHandle,
+                       const TPMS_AUTH_COMMAND *authCommand,
+                       const TPM2B_MAX_BUFFER *buffer,
+                       const TPMI_RH_HIERARCHY hierarchy,
+                       TPM2B_DIGEST *result,
+                       TPMT_TK_HASHCHECK *validation,
+                       TPMS_AUTH_RESPONSE *authResponse)
+{
+  struct grub_tpm2_buffer in;
+  struct grub_tpm2_buffer out;
+  TPM2B_DIGEST resultTmp;
+  TPMT_TK_HASHCHECK validationTmp;
+  TPMS_AUTH_RESPONSE authResponseTmp;
+  TPM_RC responseCode;
+  TPM_RC rc;
+  grub_uint32_t parameterSize;
+
+  if (!authCommand)
+    return TPM_RC_VALUE;
+
+  if (!result)
+    result = &resultTmp;
+  if (!validation)
+    validation = &validationTmp;
+  if (!authResponse)
+    authResponse = &authResponseTmp;
+
+  grub_memset (result, 0, sizeof (*result));
+  grub_memset (validation, 0, sizeof (*validation));
+  grub_memset (authResponse, 0, sizeof (*authResponse));
+
+  /* Marshal */
+  grub_tpm2_buffer_init (&in);
+  grub_tpm2_buffer_pack_u32 (&in, sequenceHandle);
+  grub_tpm2_mu_TPMS_AUTH_COMMAND_Marshal (&in, authCommand);
+  if (buffer)
+    grub_tpm2_mu_TPM2B_Marshal (&in, buffer->size, buffer->buffer);
+  else
+    grub_tpm2_buffer_pack_u16 (&in, 0);
+  grub_tpm2_buffer_pack_u32 (&in, hierarchy);
+
+  if (in.error)
+    return TPM_RC_FAILURE;
+
+  /* Submit */
+  grub_tpm2_buffer_init (&out);
+  rc = grub_tpm2_submit_command (TPM_ST_SESSIONS, TPM_CC_SequenceComplete,
+                                 &responseCode, &in, &out);
+  if (rc != TPM_RC_SUCCESS)
+    return rc;
+  if (responseCode != TPM_RC_SUCCESS)
+    return responseCode;
+
+  /* Unmarshal */
+  grub_tpm2_buffer_unpack_u32 (&out, &parameterSize);
+  grub_tpm2_mu_TPM2B_DIGEST_Unmarshal (&out, result);
+  grub_tpm2_mu_TPMT_TK_HASHCHECK_Unmarshal (&out, validation);
+  grub_tpm2_mu_TPMS_AUTH_RESPONSE_Unmarshal(&out, authResponse);
+  if (out.error)
+    return TPM_RC_FAILURE;
+
+  return TPM_RC_SUCCESS;
+}
+
+TPM_RC
+TPM2_Hash (const TPMS_AUTH_COMMAND *authCommand,
+           const TPM2B_MAX_BUFFER *data,
+           const TPMI_ALG_HASH hashAlg,
+           const TPMI_RH_HIERARCHY hierarchy,
+           TPM2B_DIGEST *outHash,
+           TPMT_TK_HASHCHECK *validation,
+           TPMS_AUTH_RESPONSE *authResponse)
+{
+  TPM_RC rc;
+  struct grub_tpm2_buffer in;
+  struct grub_tpm2_buffer out;
+  TPMS_AUTH_RESPONSE authResponseTmp;
+  TPM2B_DIGEST outHashTmp;
+  TPMT_TK_HASHCHECK validationTmp;
+  TPMI_ST_COMMAND_TAG tag = authCommand ? TPM_ST_SESSIONS : TPM_ST_NO_SESSIONS;
+  TPM_RC responseCode;
+  grub_uint32_t param_size;
+
+  if (hashAlg == TPM_ALG_NULL)
+    return TPM_RC_VALUE;
+
+  if (!outHash)
+    outHash = &outHashTmp;
+  if (!validation)
+    validation = &validationTmp;
+  if (!authResponse)
+    authResponse = &authResponseTmp;
+
+  grub_memset (outHash, 0, sizeof (*outHash));
+  grub_memset (validation, 0, sizeof (*validation));
+  grub_memset (authResponse, 0, sizeof (*authResponse));
+
+  /* Marshal */
+  grub_tpm2_buffer_init (&in);
+  if (authCommand)
+    grub_tpm2_mu_TPMS_AUTH_COMMAND_Marshal (&in, authCommand);
+  if (data)
+    grub_tpm2_mu_TPM2B_Marshal (&in, data->size, data->buffer);
+  else
+    grub_tpm2_buffer_pack_u16 (&in, 0);
+  grub_tpm2_buffer_pack_u16 (&in, hashAlg);
+  grub_tpm2_buffer_pack_u32 (&in, hierarchy);
+  if (in.error)
+    return TPM_RC_FAILURE;
+
+  /* Submit */
+  grub_tpm2_buffer_init (&out);
+  rc = grub_tpm2_submit_command (tag, TPM_CC_Hash, &responseCode, &in, &out);
+  if (rc != TPM_RC_SUCCESS)
+    return rc;
+  if (responseCode != TPM_RC_SUCCESS)
+    return responseCode;
+
+  /* Unmarshal*/
+  if (tag == TPM_ST_SESSIONS)
+    grub_tpm2_buffer_unpack_u32 (&out, &param_size);
+  grub_tpm2_mu_TPM2B_DIGEST_Unmarshal (&out, outHash);
+  grub_tpm2_mu_TPMT_TK_HASHCHECK_Unmarshal (&out, validation);
+  if (tag == TPM_ST_SESSIONS)
+    grub_tpm2_mu_TPMS_AUTH_RESPONSE_Unmarshal (&out, authResponse);
+  if (out.error)
+    return TPM_RC_FAILURE;
+
+  return TPM_RC_SUCCESS;
+}
+
+TPM_RC
+TPM2_VerifySignature (const TPMI_DH_OBJECT keyHandle,
+                      const TPMS_AUTH_COMMAND *authCommand,
+                      const TPM2B_DIGEST *digest,
+                      const TPMT_SIGNATURE *signature,
+                      TPMT_TK_VERIFIED *validation,
+                      TPMS_AUTH_RESPONSE *authResponse)
+{
+  TPM_RC rc;
+  struct grub_tpm2_buffer in;
+  struct grub_tpm2_buffer out;
+  TPMS_AUTH_RESPONSE authResponseTmp;
+  TPMI_ST_COMMAND_TAG tag = authCommand ? TPM_ST_SESSIONS : TPM_ST_NO_SESSIONS;
+  TPMT_TK_VERIFIED validationTmp;
+  TPM_RC responseCode;
+  grub_uint32_t param_size;
+
+  if (!digest || !signature)
+    return TPM_RC_VALUE;
+
+  if (!validation)
+    validation = &validationTmp;
+  if (!authResponse)
+    authResponse = &authResponseTmp;
+
+  grub_memset (validation, 0, sizeof (*validation));
+  grub_memset (authResponse, 0, sizeof (*authResponse));
+
+  /* Marshal */
+  grub_tpm2_buffer_init (&in);
+  if (authCommand)
+    grub_tpm2_mu_TPMS_AUTH_COMMAND_Marshal (&in, authCommand);
+  grub_tpm2_buffer_pack_u32 (&in, keyHandle);
+  grub_tpm2_mu_TPM2B_Marshal (&in, digest->size, digest->buffer);
+  grub_tpm2_mu_TPMT_SIGNATURE_Marshal (&in, signature);
+  if (in.error)
+    return TPM_RC_FAILURE;
+
+  /* Submit */
+  grub_tpm2_buffer_init (&out);
+  rc = grub_tpm2_submit_command (tag, TPM_CC_VerifySignature, &responseCode, &in, &out);
+  if (rc != TPM_RC_SUCCESS)
+    return rc;
+  if (responseCode != TPM_RC_SUCCESS)
+    return responseCode;
+
+  /* Unmarshal*/
+  if (tag == TPM_ST_SESSIONS)
+    grub_tpm2_buffer_unpack_u32 (&out, &param_size);
+  grub_tpm2_mu_TPMT_TK_VERIFIED_Unmarshal (&out, validation);
+  if (tag == TPM_ST_SESSIONS)
+    grub_tpm2_mu_TPMS_AUTH_RESPONSE_Unmarshal (&out, authResponse);
+  if (out.error)
+    return TPM_RC_FAILURE;
+
+  return TPM_RC_SUCCESS;
+}
+
+TPM_RC
+TPM2_PolicyAuthorize (const TPMI_SH_POLICY policySession,
+                      const TPMS_AUTH_COMMAND *authCommand,
+                      const TPM2B_DIGEST *approvedPolicy,
+                      const TPM2B_NONCE *policyRef,
+                      const TPM2B_NAME *keySign,
+                      const TPMT_TK_VERIFIED *checkTicket,
+                      TPMS_AUTH_RESPONSE *authResponse)
+{
+  TPM_RC rc;
+  struct grub_tpm2_buffer in;
+  struct grub_tpm2_buffer out;
+  TPMS_AUTH_RESPONSE authResponseTmp;
+  TPMI_ST_COMMAND_TAG tag = authCommand ? TPM_ST_SESSIONS : TPM_ST_NO_SESSIONS;
+  TPM_RC responseCode;
+  grub_uint32_t param_size;
+
+  if (!approvedPolicy || !keySign || !checkTicket)
+    return TPM_RC_VALUE;
+
+  if (!authResponse)
+    authResponse = &authResponseTmp;
+
+  grub_memset (authResponse, 0, sizeof (*authResponse));
+
+  /* Marshal */
+  grub_tpm2_buffer_init (&in);
+  grub_tpm2_buffer_pack_u32 (&in, policySession);
+  if (authCommand)
+    grub_tpm2_mu_TPMS_AUTH_COMMAND_Marshal (&in, authCommand);
+  grub_tpm2_mu_TPM2B_Marshal (&in, approvedPolicy->size, approvedPolicy->buffer);
+  if (policyRef)
+    grub_tpm2_mu_TPM2B_Marshal (&in, policyRef->size, policyRef->buffer);
+  else
+    grub_tpm2_buffer_pack_u16 (&in, 0);
+  grub_tpm2_mu_TPM2B_Marshal (&in, keySign->size, keySign->name);
+  grub_tpm2_mu_TPMT_TK_VERIFIED_Marshal (&in, checkTicket);
+  if (in.error)
+    return TPM_RC_FAILURE;
+
+  /* Submit */
+  grub_tpm2_buffer_init (&out);
+  rc = grub_tpm2_submit_command (tag, TPM_CC_PolicyAuthorize, &responseCode, &in, &out);
+  if (rc != TPM_RC_SUCCESS)
+    return rc;
+  if (responseCode != TPM_RC_SUCCESS)
+    return responseCode;
+
+  /* Unmarshal*/
+  if (tag == TPM_ST_SESSIONS)
+    grub_tpm2_buffer_unpack_u32 (&out, &param_size);
+  if (tag == TPM_ST_SESSIONS)
+    grub_tpm2_mu_TPMS_AUTH_RESPONSE_Unmarshal (&out, authResponse);
+  if (out.error)
+    return TPM_RC_FAILURE;
+
+  return TPM_RC_SUCCESS;
+}
diff --git a/include/grub/tpm2/internal/functions.h b/include/grub/tpm2/internal/functions.h
index 9380f26a2..67b78fab8 100644
--- a/include/grub/tpm2/internal/functions.h
+++ b/include/grub/tpm2/internal/functions.h
@@ -70,6 +70,15 @@ TPM2_Load (const TPMI_DH_OBJECT parent_handle,
 	   TPM2B_NAME *name,
 	   TPMS_AUTH_RESPONSE *authResponse);
 
+TPM_RC
+TPM2_LoadExternal (const TPMS_AUTH_COMMAND *authCommand,
+                   const TPM2B_SENSITIVE *inPrivate,
+                   const TPM2B_PUBLIC *inPublic,
+                   const TPMI_RH_HIERARCHY hierarchy,
+                   TPM_HANDLE *objectHandle,
+                   TPM2B_NAME *name,
+                   TPMS_AUTH_RESPONSE *authResponse);
+
 TPM_RC
 TPM2_Unseal (const TPMI_DH_OBJECT item_handle,
 	     const TPMS_AUTH_COMMAND *authCommand,
@@ -114,4 +123,52 @@ TPM2_EvictControl (const TPMI_RH_PROVISION auth,
 		   const TPMI_DH_PERSISTENT persistentHandle,
 		   TPMS_AUTH_RESPONSE *authResponse);
 
+TPM_RC
+TPM2_HashSequenceStart (const TPMS_AUTH_COMMAND *authCommand,
+                        const TPM2B_AUTH *auth,
+                        const TPMI_ALG_HASH hashAlg,
+                        TPMI_DH_OBJECT *sequenceHandle,
+                        TPMS_AUTH_RESPONSE *authResponse);
+
+TPM_RC
+TPM2_SequenceUpdate (const TPMI_DH_OBJECT sequenceHandle,
+                     const TPMS_AUTH_COMMAND *authCommand,
+                     const TPM2B_MAX_BUFFER *buffer,
+                     TPMS_AUTH_RESPONSE *authResponse);
+
+TPM_RC
+TPM2_SequenceComplete (const TPMI_DH_OBJECT sequenceHandle,
+                       const TPMS_AUTH_COMMAND *authCommand,
+                       const TPM2B_MAX_BUFFER *buffer,
+                       const TPMI_RH_HIERARCHY hierarchy,
+                       TPM2B_DIGEST *result,
+                       TPMT_TK_HASHCHECK *validation,
+                       TPMS_AUTH_RESPONSE *authResponse);
+
+TPM_RC
+TPM2_Hash (const TPMS_AUTH_COMMAND *authCommand,
+           const TPM2B_MAX_BUFFER *data,
+           const TPMI_ALG_HASH hashAlg,
+           const TPMI_RH_HIERARCHY hierarchy,
+           TPM2B_DIGEST *outHash,
+           TPMT_TK_HASHCHECK *validation,
+           TPMS_AUTH_RESPONSE *authResponse);
+
+TPM_RC
+TPM2_VerifySignature (const TPMI_DH_OBJECT keyHandle,
+                      const TPMS_AUTH_COMMAND *authCommand,
+                      const TPM2B_DIGEST *digest,
+                      const TPMT_SIGNATURE *signature,
+                      TPMT_TK_VERIFIED *validation,
+                      TPMS_AUTH_RESPONSE *authResponse);
+
+TPM_RC
+TPM2_PolicyAuthorize (const TPMI_SH_POLICY policySession,
+                      const TPMS_AUTH_COMMAND *authCommand,
+                      const TPM2B_DIGEST *approvedPolicy,
+                      const TPM2B_NONCE *policyRef,
+                      const TPM2B_NAME *keySign,
+                      const TPMT_TK_VERIFIED *checkTicket,
+                      TPMS_AUTH_RESPONSE *authResponse);
+
 #endif /* ! GRUB_TPM2_INTERNAL_FUNCTIONS_HEADER */
-- 
2.35.3

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File 0003-tpm2-Implement-more-TPM2-commands.patch of Package grub2 (Revision 9f54cdbdb7150b6725c00e026450479a)

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