70 lines
2.3 KiB
C
70 lines
2.3 KiB
C
// This file was extracted from the TCG Published
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// Trusted Platform Module Library
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// Part 3: Commands
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// Family "2.0"
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// Level 00 Revision 01.16
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// October 30, 2014
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#include "InternalRoutines.h"
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#include "NV_WriteLock_fp.h"
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#include "NV_spt_fp.h"
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//
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//
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// Error Returns Meaning
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//
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// TPM_RC_ATTRIBUTES neither TPMA_NV_WRITEDEFINE nor
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// TPMA_NV_WRITE_STCLEAR is SET in Index referenced by
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// nvIndex
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// TPM_RC_NV_AUTHORIZATION the authorization was valid but the authorizing entity (authHandle) is
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// not allowed to write to the Index referenced by nvIndex
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//
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TPM_RC
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TPM2_NV_WriteLock(
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NV_WriteLock_In *in // IN: input parameter list
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)
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{
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TPM_RC result;
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NV_INDEX nvIndex;
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// Input Validation:
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// Common write access checks, a TPM_RC_NV_AUTHORIZATION or TPM_RC_NV_LOCKED
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// error may be returned at this point
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result = NvWriteAccessChecks(in->authHandle, in->nvIndex);
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if(result != TPM_RC_SUCCESS)
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{
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if(result == TPM_RC_NV_AUTHORIZATION)
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return TPM_RC_NV_AUTHORIZATION;
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// If write access failed because the index is already locked, then it is
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// no error.
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return TPM_RC_SUCCESS;
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}
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// Get NV index info
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NvGetIndexInfo(in->nvIndex, &nvIndex);
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// if neither TPMA_NV_WRITEDEFINE nor TPMA_NV_WRITE_STCLEAR is set, the index
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// can not be write-locked
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if( nvIndex.publicArea.attributes.TPMA_NV_WRITEDEFINE == CLEAR
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&& nvIndex.publicArea.attributes.TPMA_NV_WRITE_STCLEAR == CLEAR)
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return TPM_RC_ATTRIBUTES + RC_NV_WriteLock_nvIndex;
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// Internal Data Update
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// The command needs NV update. Check if NV is available.
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// A TPM_RC_NV_UNAVAILABLE or TPM_RC_NV_RATE error may be returned at
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// this point
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result = NvIsAvailable();
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if(result != TPM_RC_SUCCESS)
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return result;
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// Set the WRITELOCK attribute.
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// Note: if TPMA_NV_WRITELOCKED were already SET, then the write access check
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// above would have failed and this code isn't executed.
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nvIndex.publicArea.attributes.TPMA_NV_WRITELOCKED = SET;
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// Write index info back
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NvWriteIndexInfo(in->nvIndex, &nvIndex);
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return TPM_RC_SUCCESS;
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}
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