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Diffstat (limited to 'src/demefactory.c')
| -rw-r--r-- | src/demefactory.c | 141 |
1 files changed, 141 insertions, 0 deletions
diff --git a/src/demefactory.c b/src/demefactory.c new file mode 100644 index 0000000..596118c --- /dev/null +++ b/src/demefactory.c @@ -0,0 +1,141 @@ +/* + * demefactory.c + * This file is part of the demefactory utility from the libreboot project + * + * Purpose: disable ME on GM45 factory firmware, but leave region intact + * enable read-write on all regions + * + * Copyright (C) 2014, 2015 Leah Rowe <info@minifree.org> + * Copyright (C) 2014 Steve Shenton <sgsit@libreboot.org> + * + * This program is free software: you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation, either version 3 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program. If not, see <http://www.gnu.org/licenses/>. + */ + +/* + * demfactory utility - main + */ + +#include "demefactory.h" + +int main() +{ + struct DESCRIPTORREGIONRECORD descriptorStruct; + uint8_t* descriptorBuffer = (uint8_t*)&descriptorStruct; + + struct GBEREGIONRECORD_8K gbeStruct8k; /* not needed, except for compatibility checking */ + + char* romFilename = "factory.rom"; + char* descriptorFilename = "demefactory_4kdescriptor.bin"; + + unsigned int bufferLength; + unsigned int romSize; + + /* + * ------------------------------------------------------------------ + * Compatibility checks. This version of ich9deblob is not yet portable. + * ------------------------------------------------------------------ + */ + + if (systemOrCompilerIncompatible(descriptorStruct, gbeStruct8k)) return 1; + /* If true, fail with error message */ + + /* + * ------------------------------------------------------------------ + * Extract the descriptor region from the factory.rom dump + * ------------------------------------------------------------------ + */ + FILE* fp = NULL; + fp = fopen(romFilename, "rb"); /* open factory.rom */ + if (NULL == fp) + { + printf("\nerror: could not open %s\n", romFilename); + fclose(fp); + return 1; + } + printf("\n%s opened successfully\n", romFilename); + + /* + * Get the descriptor region dump from the factory.rom + * (goes in factoryDescriptorBuffer variable) + */ + bufferLength = fread(descriptorBuffer, 1, DESCRIPTORREGIONSIZE, fp); + if (DESCRIPTORREGIONSIZE != bufferLength) // + { + printf("\nerror: could not read descriptor from %s (%i) bytes read\n", romFilename, bufferLength); + fclose(fp); + return 1; + } + printf("\ndescriptor region read successfully\n"); + + /* ------------------------------------------------- */ + + fseek(fp, 0L, SEEK_END); + romSize = ftell(fp); + printf("\n%s size: [%i] bytes\n", romFilename, romSize); + + /* -------------------------------------------------- */ + + fclose(fp); + + /* Debugging (before modification) */ + printDescriptorRegionLocations(descriptorStruct, "Original"); + + /* + * ------------------------------------------------------------------ + * Modify the descriptor region, ready to go in the modified factory.rom + * ------------------------------------------------------------------ + */ + + // Disable the ME/TPM: + descriptorStruct = descriptorDisableMe(descriptorStruct); + descriptorStruct = descriptorDisableTpm(descriptorStruct); + + /* Host/CPU is allowed to read/write all regions. */ + descriptorStruct = descriptorHostRegionsUnlocked(descriptorStruct); + /* The ME is disallowed read-write access to all regions + * (this is probably redundant, since the ME is already removed from libreboot) */ + descriptorStruct = descriptorMeRegionsForbidden(descriptorStruct); + + /* Debugging (after modifying the descriptor region) */ + printDescriptorRegionLocations(descriptorStruct, "Modified"); + + /* + * ------------------------------------------------------------------ + * Create the file with the modified descriptor inside + * ------------------------------------------------------------------ + */ + + printf("\n"); + if (notCreated4kDescriptorFile(descriptorStruct, descriptorFilename)) { + return 1; + } + + /* + * ------------------------------------------------------------------ + * Generate ich9gen data (C code that will recreate the deactivatedME descriptor from scratch) + * ------------------------------------------------------------------ + */ + /* Code for generating the Descriptor struct */ + /* mkdescriptor.h */ + if (notCreatedHFileForDescriptorCFile("mkdescriptor.h", "mkdescriptor.c")) { + return 1; + } /* and now mkdescriptor.c */ + if (notCreatedCFileFromDescriptorStruct(descriptorStruct, "mkdescriptor.c", "mkdescriptor.h")) { + return 1; + } + + printf("The modified descriptor region has also been dumped as src files: mkdescriptor.c, mkdescriptor.h\n\n"); + + return 0; +} |