90 lines
1.8 KiB
C
90 lines
1.8 KiB
C
#include <stdio.h>
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#include <string.h>
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#include <fcntl.h>
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#include <inttypes.h>
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#include <sys/ioctl.h>
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#include <linux/mei.h>
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#include <unistd.h>
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#include <errno.h>
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#define _countof(a) (sizeof(a)/sizeof(*(a)))
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#define NUM_DEV_NAMES 5
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char *DEF_DEV_NAMES[NUM_DEV_NAMES] = {"/dev/mei0", "/dev/mei", "/dev/mei1", "/dev/mei2", "/dev/mei3"};
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struct guid
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{
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uint32_t data1;
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uint16_t data2;
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uint16_t data3;
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uint8_t data4[8];
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};
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static const struct guid mkhi_guid = {
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0x8E6A6715,
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0x9ABC,
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0x4043,
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{0x88, 0xEF, 0x9E, 0x39, 0xC6, 0xF6, 0x3E, 0x0F}
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};
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uint8_t disable_cmd[] = {0xff,0x10,0x00,0x00};
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char *find_dev_name() {
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char *dev_name = NULL;
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struct stat st;
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for (int i = 0; i < NUM_DEV_NAMES; i++) {
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char path[20];
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snprintf(path, sizeof(path), "/dev/%s", DEF_DEV_NAMES[i]);
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if (stat(path, &st) == 0) {
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dev_name = DEF_DEV_NAMES[i];
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break;
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}
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}
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if (dev_name == NULL) {
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perror("device not found");
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exit(1);
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}
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return dev_name;
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}
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int main() {
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char *dev_name = find_dev_name();
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printf("Device found: %s\n", dev_name);
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int fd = open(dev_name, O_RDWR);
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struct mei_connect_client_data meidata;
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printf("opened\n");
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memcpy(&meidata.in_client_uuid,&mkhi_guid,sizeof(mkhi_guid));
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printf("Sending IOCTL_MEI_CONNECT_CLIENT .. ");
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int rc = ioctl(fd, IOCTL_MEI_CONNECT_CLIENT, &meidata);
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if (rc < 0) {
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printf("error\n"); fflush(stdout);
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perror("ioctl");
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close(fd);
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return 1;
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}
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printf("ok\n");
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printf("Writing disableme payload .. ");
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rc = write(fd, disable_cmd, sizeof(disable_cmd));
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if (rc < 0) {
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printf("error\n"); fflush(stdout);
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perror("write");
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close(fd);
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return 1;
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}
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fsync(fd);
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printf("written %d bytes\n",rc);
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printf("Sleep 1 sec\n",rc);
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sleep(1);
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close(fd);
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return 0;
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}
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