142 lines
4.7 KiB
C
142 lines
4.7 KiB
C
/*
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* demefactory.c
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* This file is part of the demefactory utility from the libreboot project
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*
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* Purpose: disable ME on GM45 factory firmware, but leave region intact
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* enable read-write on all regions
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*
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* Copyright (C) 2014, 2015 Leah Rowe <info@minifree.org>
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* Copyright (C) 2014 Steve Shenton <sgsit@libreboot.org>
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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/*
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* demfactory utility - main
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*/
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#include "demefactory.h"
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int main()
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{
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struct DESCRIPTORREGIONRECORD descriptorStruct;
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uint8_t* descriptorBuffer = (uint8_t*)&descriptorStruct;
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struct GBEREGIONRECORD_8K gbeStruct8k; /* not needed, except for compatibility checking */
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char* romFilename = "factory.rom";
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char* descriptorFilename = "demefactory_4kdescriptor.bin";
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unsigned int bufferLength;
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unsigned int romSize;
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/*
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* ------------------------------------------------------------------
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* Compatibility checks. This version of ich9deblob is not yet portable.
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* ------------------------------------------------------------------
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*/
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if (systemOrCompilerIncompatible(descriptorStruct, gbeStruct8k)) return 1;
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/* If true, fail with error message */
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/*
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* ------------------------------------------------------------------
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* Extract the descriptor region from the factory.rom dump
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* ------------------------------------------------------------------
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*/
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FILE* fp = NULL;
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fp = fopen(romFilename, "rb"); /* open factory.rom */
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if (NULL == fp)
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{
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printf("\nerror: could not open %s\n", romFilename);
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fclose(fp);
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return 1;
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}
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printf("\n%s opened successfully\n", romFilename);
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/*
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* Get the descriptor region dump from the factory.rom
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* (goes in factoryDescriptorBuffer variable)
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*/
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bufferLength = fread(descriptorBuffer, 1, DESCRIPTORREGIONSIZE, fp);
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if (DESCRIPTORREGIONSIZE != bufferLength) //
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{
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printf("\nerror: could not read descriptor from %s (%i) bytes read\n", romFilename, bufferLength);
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fclose(fp);
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return 1;
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}
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printf("\ndescriptor region read successfully\n");
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/* ------------------------------------------------- */
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fseek(fp, 0L, SEEK_END);
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romSize = ftell(fp);
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printf("\n%s size: [%i] bytes\n", romFilename, romSize);
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/* -------------------------------------------------- */
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fclose(fp);
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/* Debugging (before modification) */
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printDescriptorRegionLocations(descriptorStruct, "Original");
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/*
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* ------------------------------------------------------------------
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* Modify the descriptor region, ready to go in the modified factory.rom
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* ------------------------------------------------------------------
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*/
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// Disable the ME/TPM:
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descriptorStruct = descriptorDisableMe(descriptorStruct);
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descriptorStruct = descriptorDisableTpm(descriptorStruct);
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/* Host/CPU is allowed to read/write all regions. */
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descriptorStruct = descriptorHostRegionsUnlocked(descriptorStruct);
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/* The ME is disallowed read-write access to all regions
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* (this is probably redundant, since the ME is already removed from libreboot) */
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descriptorStruct = descriptorMeRegionsForbidden(descriptorStruct);
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/* Debugging (after modifying the descriptor region) */
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printDescriptorRegionLocations(descriptorStruct, "Modified");
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/*
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* ------------------------------------------------------------------
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* Create the file with the modified descriptor inside
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* ------------------------------------------------------------------
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*/
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printf("\n");
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if (notCreated4kDescriptorFile(descriptorStruct, descriptorFilename)) {
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return 1;
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}
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/*
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* ------------------------------------------------------------------
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* Generate ich9gen data (C code that will recreate the deactivatedME descriptor from scratch)
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* ------------------------------------------------------------------
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*/
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/* Code for generating the Descriptor struct */
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/* mkdescriptor.h */
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if (notCreatedHFileForDescriptorCFile("mkdescriptor.h", "mkdescriptor.c")) {
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return 1;
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} /* and now mkdescriptor.c */
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if (notCreatedCFileFromDescriptorStruct(descriptorStruct, "mkdescriptor.c", "mkdescriptor.h")) {
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return 1;
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}
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printf("The modified descriptor region has also been dumped as src files: mkdescriptor.c, mkdescriptor.h\n\n");
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return 0;
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}
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