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mei-disable.c

@@ -0,0 +1,88 @@
+#include <stdio.h>
+#include <string.h>
+#include <fcntl.h>
+#include <inttypes.h>
+#include <sys/ioctl.h>
+#include <linux/mei.h>
+#include <unistd.h>
+#include <errno.h>
+
+// Disable Intel ME engine.
+// This was tested on Z87 board.
+// Payload data taken from reverse-engineered fpt.exe v9.5.
+
+
+#define _countof(a) (sizeof(a)/sizeof(*(a)))
+
+static const char *DEV_NAME[] = { "/dev/mei", "/dev/mei0", "/dev/mei1", "/dev/mei2" };
+
+struct guid
+{
+        uint32_t   data1;
+        uint16_t   data2;
+        uint16_t   data3;
+        uint8_t   data4[8];
+};
+
+static const struct guid mkhi_guid = {
+	0x8E6A6715,
+	0x9ABC,
+	0x4043,
+	{0x88, 0xEF, 0x9E, 0x39, 0xC6, 0xF6, 0x3E, 0x0F}
+};
+
+uint8_t disable_cmd[] = {0xff,0x10,0x00,0x00};
+
+int main(int argc, char *argv[])
+{
+	int fd;
+	int rc;
+	int i;
+	struct mei_connect_client_data meidata;
+
+	for(int i=0;i<_countof(DEV_NAME);i++)
+	{
+	    printf("Opening %s ... ",DEV_NAME[i]);
+	    fd = open(DEV_NAME[i], O_RDWR);
+	    if (fd < 0) {
+		printf("%s\n", strerror(errno));
+	    }
+	}
+	if (fd<0)
+	{
+	    printf("ME device not found\n");
+	    return 1;
+	}
+
+	printf("opened\n");
+
+	memcpy(&meidata.in_client_uuid,&mkhi_guid,sizeof(mkhi_guid));
+	
+	printf("Sending IOCTL_MEI_CONNECT_CLIENT .. ");
+	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;
+	}
+	fsync(fd);
+	printf("written %d bytes\n",rc);
+
+	printf("Sleep 1 sec\n",rc);
+	sleep(1);
+
+	close(fd);
+
+	return 0;
+}

readme.txt

@@ -0,0 +1,3 @@
+This program acts the same as "fpt -disableme"
+ME enters temporary disable mode. HECI interface shuts down.
+This mode can only be cancelled by powering off the system.