| /* Copyright (c) 2012 The Chromium OS Authors. All rights reserved. |
| * Use of this source code is governed by a BSD-style license that can be |
| * found in the LICENSE file. |
| */ |
| |
| /* A lightweight TPM command library. |
| * |
| * The general idea is that TPM commands are array of bytes whose |
| * fields are mostly compile-time constant. The goal is to build much |
| * of the commands at compile time (or build time) and change some of |
| * the fields at run time as needed. The code in |
| * utility/tlcl_generator.c builds structures containing the commands, |
| * as well as the offsets of the fields that need to be set at run |
| * time. |
| */ |
| |
| #include "2sysincludes.h" |
| #include "2common.h" |
| |
| #include "sysincludes.h" |
| #include "tlcl.h" |
| #include "tlcl_internal.h" |
| #include "tlcl_structures.h" |
| #include "utility.h" |
| #include "vboot_api.h" |
| |
| #ifdef FOR_TEST |
| /* Allow unit testing implementation of TlclSendReceive() */ |
| #undef CHROMEOS_ENVIRONMENT |
| #endif |
| |
| /* Sets the size field of a TPM command. */ |
| static inline void SetTpmCommandSize(uint8_t* buffer, uint32_t size) |
| { |
| ToTpmUint32(buffer + sizeof(uint16_t), size); |
| } |
| |
| /* Gets the size field of a TPM command. */ |
| __attribute__((unused)) |
| static inline int TpmCommandSize(const uint8_t* buffer) |
| { |
| uint32_t size; |
| FromTpmUint32(buffer + sizeof(uint16_t), &size); |
| return (int) size; |
| } |
| |
| /* Gets the size field of a TPM request or response. */ |
| int TlclPacketSize(const uint8_t* packet) |
| { |
| return TpmCommandSize(packet); |
| } |
| |
| /* Gets the code field of a TPM command. */ |
| static inline int TpmCommandCode(const uint8_t* buffer) |
| { |
| uint32_t code; |
| FromTpmUint32(buffer + sizeof(uint16_t) + sizeof(uint32_t), &code); |
| return code; |
| } |
| |
| /* Gets the return code field of a TPM result. */ |
| static inline int TpmReturnCode(const uint8_t* buffer) |
| { |
| return TpmCommandCode(buffer); |
| } |
| |
| /* Like TlclSendReceive below, but do not retry if NEEDS_SELFTEST or |
| * DOING_SELFTEST errors are returned. |
| */ |
| static uint32_t TlclSendReceiveNoRetry(const uint8_t* request, |
| uint8_t* response, int max_length) |
| { |
| |
| uint32_t response_length = max_length; |
| uint32_t result; |
| |
| #ifdef EXTRA_LOGGING |
| VB2_DEBUG("TPM: command: %x%x %x%x%x%x %x%x%x%x\n", |
| request[0], request[1], |
| request[2], request[3], request[4], request[5], |
| request[6], request[7], request[8], request[9]); |
| #endif |
| |
| result = VbExTpmSendReceive(request, TpmCommandSize(request), |
| response, &response_length); |
| if (0 != result) { |
| /* Communication with TPM failed, so response is garbage */ |
| VB2_DEBUG("TPM: command 0x%x send/receive failed: 0x%x\n", |
| TpmCommandCode(request), result); |
| return result; |
| } |
| /* Otherwise, use the result code from the response */ |
| result = TpmReturnCode(response); |
| |
| /* TODO: add paranoia about returned response_length vs. max_length |
| * (and possibly expected length from the response header). See |
| * crosbug.com/17017 */ |
| |
| #ifdef EXTRA_LOGGING |
| VB2_DEBUG("TPM: response: %x%x %x%x%x%x %x%x%x%x\n", |
| response[0], response[1], |
| response[2], response[3], response[4], response[5], |
| response[6], response[7], response[8], response[9]); |
| #endif |
| |
| VB2_DEBUG("TPM: command 0x%x returned 0x%x\n", |
| TpmCommandCode(request), result); |
| |
| return result; |
| } |
| |
| /* Sends a TPM command and gets a response. Returns 0 if success or the TPM |
| * error code if error. In the firmware, waits for the self test to complete |
| * if needed. In the host, reports the first error without retries. */ |
| uint32_t TlclSendReceive(const uint8_t* request, uint8_t* response, |
| int max_length) |
| { |
| uint32_t result = TlclSendReceiveNoRetry(request, response, max_length); |
| /* When compiling for the firmware, hide command failures due to the |
| * self test not having run or completed. */ |
| #ifndef CHROMEOS_ENVIRONMENT |
| /* If the command fails because the self test has not completed, try it |
| * again after attempting to ensure that the self test has completed. */ |
| if (result == TPM_E_NEEDS_SELFTEST || result == TPM_E_DOING_SELFTEST) { |
| result = TlclContinueSelfTest(); |
| if (result != TPM_SUCCESS) { |
| return result; |
| } |
| #if defined(TPM_BLOCKING_CONTINUESELFTEST) || defined(VB_RECOVERY_MODE) |
| /* Retry only once */ |
| result = TlclSendReceiveNoRetry(request, response, max_length); |
| #else |
| /* This needs serious testing. The TPM specification says: |
| * "iii. The caller MUST wait for the actions of |
| * TPM_ContinueSelfTest to complete before reissuing the |
| * command C1." But, if ContinueSelfTest is non-blocking, how |
| * do we know that the actions have completed other than trying |
| * again? */ |
| do { |
| result = TlclSendReceiveNoRetry(request, response, |
| max_length); |
| } while (result == TPM_E_DOING_SELFTEST); |
| #endif |
| } |
| #endif /* ! defined(CHROMEOS_ENVIRONMENT) */ |
| return result; |
| } |
| |
| /* Sends a command and returns the error code. */ |
| static uint32_t Send(const uint8_t* command) |
| { |
| uint8_t response[TPM_LARGE_ENOUGH_COMMAND_SIZE]; |
| return TlclSendReceive(command, response, sizeof(response)); |
| } |
| |
| /* Exported functions. */ |
| |
| uint32_t TlclLibInit(void) |
| { |
| return VbExTpmInit(); |
| } |
| |
| uint32_t TlclLibClose(void) |
| { |
| return VbExTpmClose(); |
| } |
| |
| uint32_t TlclStartup(void) |
| { |
| VB2_DEBUG("TPM: Startup\n"); |
| return Send(tpm_startup_cmd.buffer); |
| } |
| |
| uint32_t TlclSaveState(void) |
| { |
| VB2_DEBUG("TPM: SaveState\n"); |
| return Send(tpm_savestate_cmd.buffer); |
| } |
| |
| uint32_t TlclResume(void) |
| { |
| VB2_DEBUG("TPM: Resume\n"); |
| return Send(tpm_resume_cmd.buffer); |
| } |
| |
| uint32_t TlclSelfTestFull(void) |
| { |
| VB2_DEBUG("TPM: Self test full\n"); |
| return Send(tpm_selftestfull_cmd.buffer); |
| } |
| |
| uint32_t TlclContinueSelfTest(void) |
| { |
| uint8_t response[TPM_LARGE_ENOUGH_COMMAND_SIZE]; |
| VB2_DEBUG("TPM: Continue self test\n"); |
| /* Call the No Retry version of SendReceive to avoid recursion. */ |
| return TlclSendReceiveNoRetry(tpm_continueselftest_cmd.buffer, |
| response, sizeof(response)); |
| } |
| |
| uint32_t TlclDefineSpace(uint32_t index, uint32_t perm, uint32_t size) |
| { |
| struct s_tpm_nv_definespace_cmd cmd; |
| VB2_DEBUG("TPM: TlclDefineSpace(0x%x, 0x%x, %d)\n", index, perm, size); |
| memcpy(&cmd, &tpm_nv_definespace_cmd, sizeof(cmd)); |
| ToTpmUint32(cmd.buffer + tpm_nv_definespace_cmd.index, index); |
| ToTpmUint32(cmd.buffer + tpm_nv_definespace_cmd.perm, perm); |
| ToTpmUint32(cmd.buffer + tpm_nv_definespace_cmd.size, size); |
| return Send(cmd.buffer); |
| } |
| |
| uint32_t TlclWrite(uint32_t index, const void* data, uint32_t length) |
| { |
| struct s_tpm_nv_write_cmd cmd; |
| uint8_t response[TPM_LARGE_ENOUGH_COMMAND_SIZE]; |
| const int total_length = |
| kTpmRequestHeaderLength + kWriteInfoLength + length; |
| |
| VB2_DEBUG("TPM: TlclWrite(0x%x, %d)\n", index, length); |
| memcpy(&cmd, &tpm_nv_write_cmd, sizeof(cmd)); |
| VbAssert(total_length <= TPM_LARGE_ENOUGH_COMMAND_SIZE); |
| SetTpmCommandSize(cmd.buffer, total_length); |
| |
| ToTpmUint32(cmd.buffer + tpm_nv_write_cmd.index, index); |
| ToTpmUint32(cmd.buffer + tpm_nv_write_cmd.length, length); |
| memcpy(cmd.buffer + tpm_nv_write_cmd.data, data, length); |
| |
| return TlclSendReceive(cmd.buffer, response, sizeof(response)); |
| } |
| |
| uint32_t TlclRead(uint32_t index, void* data, uint32_t length) |
| { |
| struct s_tpm_nv_read_cmd cmd; |
| uint8_t response[TPM_LARGE_ENOUGH_COMMAND_SIZE]; |
| uint32_t result_length; |
| uint32_t result; |
| |
| VB2_DEBUG("TPM: TlclRead(0x%x, %d)\n", index, length); |
| memcpy(&cmd, &tpm_nv_read_cmd, sizeof(cmd)); |
| ToTpmUint32(cmd.buffer + tpm_nv_read_cmd.index, index); |
| ToTpmUint32(cmd.buffer + tpm_nv_read_cmd.length, length); |
| |
| result = TlclSendReceive(cmd.buffer, response, sizeof(response)); |
| if (result == TPM_SUCCESS && length > 0) { |
| uint8_t* nv_read_cursor = response + kTpmResponseHeaderLength; |
| FromTpmUint32(nv_read_cursor, &result_length); |
| if (result_length > length) |
| result_length = length; /* Truncate to fit buffer */ |
| nv_read_cursor += sizeof(uint32_t); |
| memcpy(data, nv_read_cursor, result_length); |
| } |
| |
| return result; |
| } |
| |
| uint32_t TlclPCRRead(uint32_t index, void* data, uint32_t length) |
| { |
| struct s_tpm_pcr_read_cmd cmd; |
| uint8_t response[TPM_LARGE_ENOUGH_COMMAND_SIZE]; |
| uint32_t result; |
| |
| VB2_DEBUG("TPM: TlclPCRRead(0x%x, %d)\n", index, length); |
| if (length < kPcrDigestLength) { |
| return TPM_E_IOERROR; |
| } |
| memcpy(&cmd, &tpm_pcr_read_cmd, sizeof(cmd)); |
| ToTpmUint32(cmd.buffer + tpm_pcr_read_cmd.pcrNum, index); |
| |
| result = TlclSendReceive(cmd.buffer, response, sizeof(response)); |
| if (result == TPM_SUCCESS) { |
| uint8_t* pcr_read_cursor = response + kTpmResponseHeaderLength; |
| memcpy(data, pcr_read_cursor, kPcrDigestLength); |
| } |
| |
| return result; |
| } |
| |
| uint32_t TlclWriteLock(uint32_t index) |
| { |
| VB2_DEBUG("TPM: Write lock 0x%x\n", index); |
| return TlclWrite(index, NULL, 0); |
| } |
| |
| uint32_t TlclReadLock(uint32_t index) |
| { |
| VB2_DEBUG("TPM: Read lock 0x%x\n", index); |
| return TlclRead(index, NULL, 0); |
| } |
| |
| uint32_t TlclAssertPhysicalPresence(void) |
| { |
| VB2_DEBUG("TPM: Asserting physical presence\n"); |
| return Send(tpm_ppassert_cmd.buffer); |
| } |
| |
| uint32_t TlclPhysicalPresenceCMDEnable(void) |
| { |
| VB2_DEBUG("TPM: Enable the physical presence command\n"); |
| return Send(tpm_ppenable_cmd.buffer); |
| } |
| |
| uint32_t TlclFinalizePhysicalPresence(void) |
| { |
| VB2_DEBUG("TPM: Enable PP cmd, disable HW pp, and set lifetime lock\n"); |
| return Send(tpm_finalizepp_cmd.buffer); |
| } |
| |
| uint32_t TlclAssertPhysicalPresenceResult(void) |
| { |
| uint8_t response[TPM_LARGE_ENOUGH_COMMAND_SIZE]; |
| return TlclSendReceive(tpm_ppassert_cmd.buffer, response, |
| sizeof(response)); |
| } |
| |
| uint32_t TlclLockPhysicalPresence(void) |
| { |
| VB2_DEBUG("TPM: Lock physical presence\n"); |
| return Send(tpm_pplock_cmd.buffer); |
| } |
| |
| uint32_t TlclSetNvLocked(void) |
| { |
| VB2_DEBUG("TPM: Set NV locked\n"); |
| return TlclDefineSpace(TPM_NV_INDEX_LOCK, 0, 0); |
| } |
| |
| int TlclIsOwned(void) |
| { |
| uint8_t response[TPM_LARGE_ENOUGH_COMMAND_SIZE + TPM_PUBEK_SIZE]; |
| uint32_t result; |
| result = TlclSendReceive(tpm_readpubek_cmd.buffer, |
| response, sizeof(response)); |
| return (result != TPM_SUCCESS); |
| } |
| |
| uint32_t TlclForceClear(void) |
| { |
| VB2_DEBUG("TPM: Force clear\n"); |
| return Send(tpm_forceclear_cmd.buffer); |
| } |
| |
| uint32_t TlclSetEnable(void) |
| { |
| VB2_DEBUG("TPM: Enabling TPM\n"); |
| return Send(tpm_physicalenable_cmd.buffer); |
| } |
| |
| uint32_t TlclClearEnable(void) |
| { |
| VB2_DEBUG("TPM: Disabling TPM\n"); |
| return Send(tpm_physicaldisable_cmd.buffer); |
| } |
| |
| uint32_t TlclSetDeactivated(uint8_t flag) |
| { |
| struct s_tpm_physicalsetdeactivated_cmd cmd; |
| VB2_DEBUG("TPM: SetDeactivated(%d)\n", flag); |
| memcpy(&cmd, &tpm_physicalsetdeactivated_cmd, sizeof(cmd)); |
| *(cmd.buffer + cmd.deactivated) = flag; |
| return Send(cmd.buffer); |
| } |
| |
| uint32_t TlclGetPermanentFlags(TPM_PERMANENT_FLAGS* pflags) |
| { |
| uint8_t response[TPM_LARGE_ENOUGH_COMMAND_SIZE]; |
| uint32_t size; |
| uint32_t result = TlclSendReceive(tpm_getflags_cmd.buffer, response, |
| sizeof(response)); |
| if (result != TPM_SUCCESS) |
| return result; |
| FromTpmUint32(response + kTpmResponseHeaderLength, &size); |
| /* TODO(crbug.com/379255): This fails. Find out why. |
| * VbAssert(size == sizeof(TPM_PERMANENT_FLAGS)); |
| */ |
| memcpy(pflags, |
| response + kTpmResponseHeaderLength + sizeof(size), |
| sizeof(TPM_PERMANENT_FLAGS)); |
| return result; |
| } |
| |
| uint32_t TlclGetSTClearFlags(TPM_STCLEAR_FLAGS* vflags) |
| { |
| uint8_t response[TPM_LARGE_ENOUGH_COMMAND_SIZE]; |
| uint32_t size; |
| uint32_t result = TlclSendReceive(tpm_getstclearflags_cmd.buffer, |
| response, sizeof(response)); |
| if (result != TPM_SUCCESS) |
| return result; |
| FromTpmUint32(response + kTpmResponseHeaderLength, &size); |
| /* Ugly assertion, but the struct is padded up by one byte. */ |
| /* TODO(crbug.com/379255): This fails. Find out why. |
| * VbAssert(size == 7 && sizeof(TPM_STCLEAR_FLAGS) - 1 == 7); |
| */ |
| memcpy(vflags, |
| response + kTpmResponseHeaderLength + sizeof(size), |
| sizeof(TPM_STCLEAR_FLAGS)); |
| return result; |
| } |
| |
| uint32_t TlclGetFlags(uint8_t* disable, |
| uint8_t* deactivated, |
| uint8_t *nvlocked) |
| { |
| TPM_PERMANENT_FLAGS pflags; |
| uint32_t result = TlclGetPermanentFlags(&pflags); |
| if (result == TPM_SUCCESS) { |
| if (disable) |
| *disable = pflags.disable; |
| if (deactivated) |
| *deactivated = pflags.deactivated; |
| if (nvlocked) |
| *nvlocked = pflags.nvLocked; |
| VB2_DEBUG("TPM: Got flags disable=%d, deactivated=%d, " |
| "nvlocked=%d\n", |
| pflags.disable, pflags.deactivated, pflags.nvLocked); |
| } |
| return result; |
| } |
| |
| uint32_t TlclSetGlobalLock(void) |
| { |
| uint32_t x; |
| VB2_DEBUG("TPM: Set global lock\n"); |
| return TlclWrite(TPM_NV_INDEX0, (uint8_t*) &x, 0); |
| } |
| |
| uint32_t TlclExtend(int pcr_num, const uint8_t* in_digest, |
| uint8_t* out_digest) |
| { |
| struct s_tpm_extend_cmd cmd; |
| uint8_t response[kTpmResponseHeaderLength + kPcrDigestLength]; |
| uint32_t result; |
| |
| memcpy(&cmd, &tpm_extend_cmd, sizeof(cmd)); |
| ToTpmUint32(cmd.buffer + tpm_extend_cmd.pcrNum, pcr_num); |
| memcpy(cmd.buffer + cmd.inDigest, in_digest, kPcrDigestLength); |
| |
| result = TlclSendReceive(cmd.buffer, response, sizeof(response)); |
| if (result != TPM_SUCCESS) |
| return result; |
| |
| memcpy(out_digest, response + kTpmResponseHeaderLength, |
| kPcrDigestLength); |
| return result; |
| } |
| |
| uint32_t TlclGetPermissions(uint32_t index, uint32_t* permissions) |
| { |
| struct s_tpm_getpermissions_cmd cmd; |
| uint8_t response[TPM_LARGE_ENOUGH_COMMAND_SIZE]; |
| uint8_t* nvdata; |
| uint32_t result; |
| uint32_t size; |
| |
| memcpy(&cmd, &tpm_getpermissions_cmd, sizeof(cmd)); |
| ToTpmUint32(cmd.buffer + tpm_getpermissions_cmd.index, index); |
| result = TlclSendReceive(cmd.buffer, response, sizeof(response)); |
| if (result != TPM_SUCCESS) |
| return result; |
| |
| nvdata = response + kTpmResponseHeaderLength + sizeof(size); |
| FromTpmUint32(nvdata + kNvDataPublicPermissionsOffset, permissions); |
| return result; |
| } |
| |
| uint32_t TlclGetOwnership(uint8_t* owned) |
| { |
| uint8_t response[TPM_LARGE_ENOUGH_COMMAND_SIZE]; |
| uint32_t size; |
| uint32_t result = TlclSendReceive(tpm_getownership_cmd.buffer, |
| response, sizeof(response)); |
| if (result != TPM_SUCCESS) |
| return result; |
| FromTpmUint32(response + kTpmResponseHeaderLength, &size); |
| /* TODO(crbug.com/379255): This fails. Find out why. |
| * VbAssert(size == sizeof(*owned)); |
| */ |
| memcpy(owned, |
| response + kTpmResponseHeaderLength + sizeof(size), |
| sizeof(*owned)); |
| return result; |
| } |
| |
| uint32_t TlclGetRandom(uint8_t* data, uint32_t length, uint32_t *size) |
| { |
| struct s_tpm_get_random_cmd cmd; |
| uint8_t response[TPM_LARGE_ENOUGH_COMMAND_SIZE]; |
| uint32_t result; |
| |
| VB2_DEBUG("TPM: TlclGetRandom(%d)\n", length); |
| memcpy(&cmd, &tpm_get_random_cmd, sizeof(cmd)); |
| ToTpmUint32(cmd.buffer + tpm_get_random_cmd.bytesRequested, length); |
| /* There must be room in the response buffer for the bytes. */ |
| if (length > TPM_LARGE_ENOUGH_COMMAND_SIZE - kTpmResponseHeaderLength |
| - sizeof(uint32_t)) { |
| return TPM_E_IOERROR; |
| } |
| |
| result = TlclSendReceive(cmd.buffer, response, sizeof(response)); |
| if (result == TPM_SUCCESS) { |
| uint8_t* get_random_cursor; |
| FromTpmUint32(response + kTpmResponseHeaderLength, size); |
| |
| /* There must be room in the target buffer for the bytes. */ |
| if (*size > length) { |
| return TPM_E_RESPONSE_TOO_LARGE; |
| } |
| get_random_cursor = response + kTpmResponseHeaderLength |
| + sizeof(uint32_t); |
| memcpy(data, get_random_cursor, *size); |
| } |
| |
| return result; |
| } |
| |
| uint32_t TlclGetVersion(uint32_t* vendor, uint64_t* firmware_version, |
| uint8_t* vendor_specific_buf, |
| size_t* vendor_specific_buf_size) |
| { |
| uint8_t response[TPM_LARGE_ENOUGH_COMMAND_SIZE]; |
| uint32_t result = TlclSendReceive(tpm_getversionval_cmd.buffer, |
| response, sizeof(response)); |
| if (result != TPM_SUCCESS) |
| return result; |
| |
| uint8_t* cursor = response + kTpmResponseHeaderLength; |
| |
| uint32_t size; |
| FromTpmUint32(cursor, &size); |
| cursor += sizeof(size); |
| |
| /* Verify size >= sizeof(TPM_CAP_VERSION_INFO). */ |
| const uint32_t kSizeofCapVersionInfo = 15; |
| if (size < kSizeofCapVersionInfo || |
| kTpmResponseHeaderLength + sizeof(size) + size > |
| TPM_LARGE_ENOUGH_COMMAND_SIZE) { |
| return TPM_E_IOERROR; |
| } |
| |
| cursor += sizeof(uint16_t); /* tag */ |
| cursor += sizeof(uint16_t); /* spec version */ |
| |
| uint16_t version; |
| FromTpmUint16(cursor, &version); |
| cursor += sizeof(version); |
| *firmware_version = version; |
| |
| cursor += sizeof(uint16_t); /* specLevel */ |
| cursor += sizeof(uint8_t); /* errataRev */ |
| |
| FromTpmUint32(cursor, vendor); |
| cursor += sizeof(*vendor); |
| |
| if (vendor_specific_buf_size) { |
| uint16_t vendor_specific_size; |
| FromTpmUint16(cursor, &vendor_specific_size); |
| cursor += sizeof(vendor_specific_size); |
| |
| if (size < kSizeofCapVersionInfo + vendor_specific_size) { |
| return TPM_E_IOERROR; |
| } |
| if (vendor_specific_buf) { |
| if (vendor_specific_size > *vendor_specific_buf_size) { |
| vendor_specific_size = |
| *vendor_specific_buf_size; |
| } |
| memcpy(vendor_specific_buf, cursor, |
| vendor_specific_size); |
| cursor += vendor_specific_size; |
| } |
| *vendor_specific_buf_size = vendor_specific_size; |
| } |
| |
| return TPM_SUCCESS; |
| } |
| |
| static void ParseIFXFirmwarePackage(uint8_t** cursor, |
| TPM_IFX_FIRMWAREPACKAGE* firmware_package) { |
| |
| FromTpmUint32(*cursor, &firmware_package->FwPackageIdentifier); |
| *cursor += sizeof(firmware_package->FwPackageIdentifier); |
| FromTpmUint32(*cursor, &firmware_package->Version); |
| *cursor += sizeof(firmware_package->Version); |
| FromTpmUint32(*cursor, &firmware_package->StaleVersion); |
| *cursor += sizeof(firmware_package->StaleVersion); |
| } |
| |
| uint32_t TlclIFXFieldUpgradeInfo(TPM_IFX_FIELDUPGRADEINFO* info) { |
| uint32_t vendor; |
| uint64_t firmware_version; |
| uint32_t result = |
| TlclGetVersion(&vendor, &firmware_version, NULL, NULL); |
| if (result != TPM_SUCCESS) { |
| return result; |
| } |
| if (vendor != 0x49465800) { |
| return TPM_E_BAD_ORDINAL; |
| } |
| |
| uint8_t response[TPM_LARGE_ENOUGH_COMMAND_SIZE]; |
| result = TlclSendReceive(tpm_ifx_fieldupgradeinforequest2_cmd.buffer, |
| response, sizeof(response)); |
| if (result != TPM_SUCCESS) { |
| return result; |
| } |
| |
| uint8_t* cursor = response + kTpmResponseHeaderLength; |
| |
| uint16_t size; |
| FromTpmUint16(cursor, &size); |
| cursor += sizeof(size); |
| |
| /* Comments below indicate skipped fields of unknown purpose that are |
| * marked "internal" in the firmware updater source. */ |
| cursor += sizeof(uint16_t); /* internal1 */ |
| FromTpmUint16(cursor, &info->wMaxDataSize); |
| cursor += sizeof(info->wMaxDataSize); |
| cursor += sizeof(uint16_t); /* sSecurityModuleLogic.internal1 */ |
| cursor += sizeof(uint32_t); /* sSecurityModuleLogic.internal2 */ |
| cursor += sizeof(uint8_t[34]); /* sSecurityModuleLogic.internal3 */ |
| ParseIFXFirmwarePackage(&cursor, &info->sBootloaderFirmwarePackage); |
| uint16_t fw_entry_count; |
| FromTpmUint16(cursor, &fw_entry_count); |
| cursor += sizeof(fw_entry_count); |
| if (fw_entry_count > ARRAY_SIZE(info->sFirmwarePackages)) { |
| return TPM_E_IOERROR; |
| } |
| uint16_t i; |
| for (i = 0; i < fw_entry_count; ++i) { |
| ParseIFXFirmwarePackage(&cursor, &info->sFirmwarePackages[i]); |
| } |
| FromTpmUint16(cursor, &info->wSecurityModuleStatus); |
| cursor += sizeof(info->wSecurityModuleStatus); |
| ParseIFXFirmwarePackage(&cursor, &info->sProcessFirmwarePackage); |
| cursor += sizeof(uint16_t); /* internal6 */ |
| cursor += sizeof(uint8_t[6]); /* internal7 */ |
| FromTpmUint16(cursor, &info->wFieldUpgradeCounter); |
| cursor += sizeof(info->wFieldUpgradeCounter); |
| |
| uint32_t parsed_bytes = cursor - response; |
| VbAssert(parsed_bytes <= TPM_LARGE_ENOUGH_COMMAND_SIZE); |
| if (parsed_bytes > kTpmResponseHeaderLength + sizeof(size) + size) { |
| return TPM_E_IOERROR; |
| } |
| |
| return result; |
| } |