Vadim Bendebury | 5679752 | 2015-05-20 10:32:25 -0700 | [diff] [blame] | 1 | // This file was extracted from the TCG Published |
| 2 | // Trusted Platform Module Library |
| 3 | // Part 3: Commands |
| 4 | // Family "2.0" |
| 5 | // Level 00 Revision 01.16 |
| 6 | // October 30, 2014 |
| 7 | |
| 8 | #include "InternalRoutines.h" |
| 9 | #include "NV_WriteLock_fp.h" |
| 10 | #include "NV_spt_fp.h" |
| 11 | // |
| 12 | // |
| 13 | // Error Returns Meaning |
| 14 | // |
| 15 | // TPM_RC_ATTRIBUTES neither TPMA_NV_WRITEDEFINE nor |
| 16 | // TPMA_NV_WRITE_STCLEAR is SET in Index referenced by |
| 17 | // nvIndex |
| 18 | // TPM_RC_NV_AUTHORIZATION the authorization was valid but the authorizing entity (authHandle) is |
| 19 | // not allowed to write to the Index referenced by nvIndex |
| 20 | // |
| 21 | TPM_RC |
| 22 | TPM2_NV_WriteLock( |
| 23 | NV_WriteLock_In *in // IN: input parameter list |
| 24 | ) |
| 25 | { |
| 26 | TPM_RC result; |
| 27 | NV_INDEX nvIndex; |
| 28 | |
| 29 | // Input Validation: |
| 30 | |
| 31 | // Common write access checks, a TPM_RC_NV_AUTHORIZATION or TPM_RC_NV_LOCKED |
| 32 | // error may be returned at this point |
| 33 | result = NvWriteAccessChecks(in->authHandle, in->nvIndex); |
| 34 | if(result != TPM_RC_SUCCESS) |
| 35 | { |
| 36 | if(result == TPM_RC_NV_AUTHORIZATION) |
| 37 | return TPM_RC_NV_AUTHORIZATION; |
| 38 | // If write access failed because the index is already locked, then it is |
| 39 | // no error. |
| 40 | return TPM_RC_SUCCESS; |
| 41 | } |
| 42 | |
| 43 | // Get NV index info |
| 44 | NvGetIndexInfo(in->nvIndex, &nvIndex); |
| 45 | |
| 46 | // if neither TPMA_NV_WRITEDEFINE nor TPMA_NV_WRITE_STCLEAR is set, the index |
| 47 | // can not be write-locked |
| 48 | if( nvIndex.publicArea.attributes.TPMA_NV_WRITEDEFINE == CLEAR |
| 49 | && nvIndex.publicArea.attributes.TPMA_NV_WRITE_STCLEAR == CLEAR) |
| 50 | return TPM_RC_ATTRIBUTES + RC_NV_WriteLock_nvIndex; |
| 51 | |
| 52 | // Internal Data Update |
| 53 | |
| 54 | // The command needs NV update. Check if NV is available. |
| 55 | // A TPM_RC_NV_UNAVAILABLE or TPM_RC_NV_RATE error may be returned at |
| 56 | // this point |
| 57 | result = NvIsAvailable(); |
| 58 | if(result != TPM_RC_SUCCESS) |
| 59 | return result; |
| 60 | |
| 61 | // Set the WRITELOCK attribute. |
| 62 | // Note: if TPMA_NV_WRITELOCKED were already SET, then the write access check |
| 63 | // above would have failed and this code isn't executed. |
| 64 | nvIndex.publicArea.attributes.TPMA_NV_WRITELOCKED = SET; |
| 65 | |
| 66 | // Write index info back |
| 67 | NvWriteIndexInfo(in->nvIndex, &nvIndex); |
| 68 | |
| 69 | return TPM_RC_SUCCESS; |
| 70 | } |