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// This file was extracted from the TCG Published
// Trusted Platform Module Library
// Part 3: Commands
// Family "2.0"
// Level 00 Revision 01.16
// October 30, 2014
#include "InternalRoutines.h"
#include "NV_ReadLock_fp.h"
#include "NV_spt_fp.h"
//
//
// Error Returns Meaning
//
// TPM_RC_ATTRIBUTES TPMA_NV_READ_STCLEAR is not SET so Index referenced by
// nvIndex may not be write locked
// TPM_RC_NV_AUTHORIZATION the authorization was valid but the authorizing entity (authHandle) is
// not allowed to read from the Index referenced by nvIndex
//
TPM_RC
TPM2_NV_ReadLock(
NV_ReadLock_In *in // IN: input parameter list
)
{
TPM_RC result;
NV_INDEX nvIndex;
// The command needs NV update. Check if NV is available.
// A TPM_RC_NV_UNAVAILABLE or TPM_RC_NV_RATE error may be returned at
// this point
result = NvIsAvailable();
if(result != TPM_RC_SUCCESS) return result;
// Input Validation
// Common read access checks. NvReadAccessChecks() returns
// TPM_RC_NV_AUTHORIZATION, TPM_RC_NV_LOCKED, or TPM_RC_NV_UNINITIALIZED
// error may be returned at this point
result = NvReadAccessChecks(in->authHandle, in->nvIndex);
if(result != TPM_RC_SUCCESS)
{
if(result == TPM_RC_NV_AUTHORIZATION)
return TPM_RC_NV_AUTHORIZATION;
// Index is already locked for write
else if(result == TPM_RC_NV_LOCKED)
return TPM_RC_SUCCESS;
// If NvReadAccessChecks return TPM_RC_NV_UNINITALIZED, then continue.
// It is not an error to read lock an uninitialized Index.
}
// Get NV index info
NvGetIndexInfo(in->nvIndex, &nvIndex);
// if TPMA_NV_READ_STCLEAR is not set, the index can not be read-locked
if(nvIndex.publicArea.attributes.TPMA_NV_READ_STCLEAR == CLEAR)
return TPM_RC_ATTRIBUTES + RC_NV_ReadLock_nvIndex;
// Internal Data Update
// Set the READLOCK attribute
nvIndex.publicArea.attributes.TPMA_NV_READLOCKED = SET;
// Write NV info back
NvWriteIndexInfo(in->nvIndex, &nvIndex);
return TPM_RC_SUCCESS;
}
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