the-spellman/ime-disabler
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Update mei-disable.c

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Sam Sneed 2024-06-14 20:21:53 +00:00 committed by GitHub
parent 13c589cded
commit 7e11ecb064
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GPG key ID: B5690EEEBB952194
1 changed files with 40 additions and 30 deletions
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70
mei-disable.c
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@ -1,17 +1,16 @@
#include <stdio.h>
#include <string.h>
#include <fcntl.h>
#include <inttypes.h>
#include <sys/ioctl.h>
#include <sys/stat.h>
#include <linux/mei.h>
#include <unistd.h>
#include <errno.h>
#include <stdlib.h>
#include <string.h>
#include <sys/stat.h>
#define _countof(a) (sizeof(a)/sizeof(*(a)))
#define NUM_DEV_NAMES 5
char *DEF_DEV_NAMES[NUM_DEV_NAMES] = {"mei0", "mei", "mei1", "mei2", "mei3"};
// Disable Intel ME engine.
// This was tested on Z87 board.
// Payload data taken from reverse-engineered fpt.exe v9.5.
struct guid
{
@ -28,16 +27,20 @@ static const struct guid mkhi_guid = {
{0x88, 0xEF, 0x9E, 0x39, 0xC6, 0xF6, 0x3E, 0x0F}
};
uint8_t disable_cmd[] = {0xff,0x10,0x00,0x00};
#define NUM_DEV_NAMES 5
char *DEF_DEV_NAMES[NUM_DEV_NAMES] = {"/dev/mei0", "/dev/mei", "/dev/mei1", "/dev/mei2", "/dev/mei3"};
char *find_dev_name() {
char *imeCheck() {
char *dev_name = NULL;
struct stat st;
for (int i = 0; i < NUM_DEV_NAMES; i++) {
char path[20];
snprintf(path, sizeof(path), "/dev/%s", DEF_DEV_NAMES[i]);
snprintf(path, sizeof(path), "%s", DEF_DEV_NAMES[i]);
if (stat(path, &st) == 0) {
dev_name = DEF_DEV_NAMES[i];
@ -46,42 +49,49 @@ char *find_dev_name() {
}
if (dev_name == NULL) {
perror("device not found");
perror("ME Device not found.\n");
exit(1);
}
printf("Found ME device!\n");
return dev_name;
}
int main() {
char *dev_name = find_dev_name();
printf("Device found: %s\n", dev_name);
int fd = open(dev_name, O_RDWR);
int main(int argc, char *argv[])
{
int fd;
int rc;
int i;
struct mei_connect_client_data meidata;
char *DEV_NAME = imeCheck();
printf("Opening %s ... ", DEV_NAME);
fd = open(DEV_NAME, O_RDWR);
if (fd < 0) {
printf("error\n"); fflush(stdout);
perror("mei device open");
return 1;
}
printf("opened\n");
memcpy(&meidata.in_client_uuid,&mkhi_guid,sizeof(mkhi_guid));
printf("Sending IOCTL_MEI_CONNECT_CLIENT .. ");
// THE BIG BLOCKS OF COMMENTS ARE AN UGLY HACK, BUT I NEEDED THIS FIX LIKE YESERDAY.
int rc = ioctl(fd, IOCTL_MEI_CONNECT_CLIENT, &meidata);
//if (rc < 0) {
//printf("error\n"); fflush(stdout);
//perror("ioctl");
//close(fd);
//return 1;
//}
rc = ioctl(fd, IOCTL_MEI_CONNECT_CLIENT, &meidata);
if (rc < 0) {
printf("error\n"); fflush(stdout);
perror("ioctl");
close(fd);
return 1;
}
printf("ok\n");
printf("Writing disableme payload .. ");
rc = write(fd, disable_cmd, sizeof(disable_cmd));
//if (rc < 0) {
//printf("error\n"); fflush(stdout);
//perror("write");
//close(fd);
//return 1;
//}
if (rc < 0) {
printf("error\n"); fflush(stdout);
perror("write");
close(fd);
return 1;
}
fsync(fd);
printf("written %d bytes\n",rc);