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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_WriteLock_fp.h"
#include "NV_spt_fp.h"
//
//
// Error Returns Meaning
//
// TPM_RC_ATTRIBUTES neither TPMA_NV_WRITEDEFINE nor
// TPMA_NV_WRITE_STCLEAR is SET in Index referenced by
// nvIndex
// TPM_RC_NV_AUTHORIZATION the authorization was valid but the authorizing entity (authHandle) is
// not allowed to write to the Index referenced by nvIndex
//
TPM_RC
TPM2_NV_WriteLock(
NV_WriteLock_In *in // IN: input parameter list
)
{
TPM_RC result;
NV_INDEX nvIndex;
// Input Validation:
// Common write access checks, a TPM_RC_NV_AUTHORIZATION or TPM_RC_NV_LOCKED
// error may be returned at this point
result = NvWriteAccessChecks(in->authHandle, in->nvIndex);
if(result != TPM_RC_SUCCESS)
{
if(result == TPM_RC_NV_AUTHORIZATION)
return TPM_RC_NV_AUTHORIZATION;
// If write access failed because the index is already locked, then it is
// no error.
return TPM_RC_SUCCESS;
}
// Get NV index info
NvGetIndexInfo(in->nvIndex, &nvIndex);
// if neither TPMA_NV_WRITEDEFINE nor TPMA_NV_WRITE_STCLEAR is set, the index
// can not be write-locked
if( nvIndex.publicArea.attributes.TPMA_NV_WRITEDEFINE == CLEAR
&& nvIndex.publicArea.attributes.TPMA_NV_WRITE_STCLEAR == CLEAR)
return TPM_RC_ATTRIBUTES + RC_NV_WriteLock_nvIndex;
// Internal Data Update
// 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;
// Set the WRITELOCK attribute.
// Note: if TPMA_NV_WRITELOCKED were already SET, then the write access check
// above would have failed and this code isn't executed.
nvIndex.publicArea.attributes.TPMA_NV_WRITELOCKED = SET;
// Write index info back
NvWriteIndexInfo(in->nvIndex, &nvIndex);
return TPM_RC_SUCCESS;
}