67 lines
2.2 KiB
C
67 lines
2.2 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_ReadLock_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 TPMA_NV_READ_STCLEAR is not SET so Index referenced by
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// nvIndex may not be write locked
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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 read from the Index referenced by nvIndex
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//
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TPM_RC
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TPM2_NV_ReadLock(
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NV_ReadLock_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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// 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) return result;
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// Input Validation
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// Common read access checks. NvReadAccessChecks() returns
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// TPM_RC_NV_AUTHORIZATION, TPM_RC_NV_LOCKED, or TPM_RC_NV_UNINITIALIZED
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// error may be returned at this point
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result = NvReadAccessChecks(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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// Index is already locked for write
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else if(result == TPM_RC_NV_LOCKED)
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return TPM_RC_SUCCESS;
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// If NvReadAccessChecks return TPM_RC_NV_UNINITALIZED, then continue.
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// It is not an error to read lock an uninitialized Index.
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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 TPMA_NV_READ_STCLEAR is not set, the index can not be read-locked
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if(nvIndex.publicArea.attributes.TPMA_NV_READ_STCLEAR == CLEAR)
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return TPM_RC_ATTRIBUTES + RC_NV_ReadLock_nvIndex;
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// Internal Data Update
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// Set the READLOCK attribute
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nvIndex.publicArea.attributes.TPMA_NV_READLOCKED = SET;
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// Write NV 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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