summaryrefslogtreecommitdiff
path: root/util/intelmetool/intelmetool.c
blob: c49c635ca5d3adb8577c27224b8e317331166571 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
/* intelmetool  Dump interesting things about Management Engine even if hidden
 * Copyright (C) 2014  Damien Zammit <damien@zamaudio.com>
 *
 * 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; version 2 of the License.
 *
 * 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.
 */

#include <stdio.h>
#include <inttypes.h>
#include <stdlib.h>
#include <getopt.h>
#include <unistd.h>

#ifdef __NetBSD__
#include <machine/sysarch.h>
#endif

#include "me.h"
#include "mmap.h"
#include "intelmetool.h"

#define FD2 0x3428
#define ME_COMMAND_DELAY 10000

extern int fd_mem;
int debug = 0;

static uint32_t fd2 = 0;
static const int size = 0x4000;
static volatile uint8_t *rcba;

static void dumpmem(uint8_t *phys, uint32_t size)
{
	uint32_t i;
	printf("Dumping cloned ME memory:\n");
	for (i = 0; i < size; i++) {
		printf("%02X",*((uint8_t *) (phys + i)));
	}
	printf("\n");
}

static void zeroit(uint8_t *phys, uint32_t size)
{
	uint32_t i;
	for (i = 0; i < size; i++) {
		*((uint8_t *) (phys + i)) = 0x00;
	}
}

static void dumpmemfile(uint8_t *phys, uint32_t size)
{
	FILE *fp = fopen("medump.bin", "w");
	uint32_t i;
	for (i = 0; i < size; i++) {
		fprintf(fp, "%c", *((uint8_t *) (phys + i)));
	}
	fclose(fp);
}

static void rehide_me() {
	if (fd2 & 0x2) {
		printf("Re-hiding MEI device...");
		fd2 = *(uint32_t *)(rcba + FD2);
		*(uint32_t *)(rcba + FD2) = fd2 | 0x2;
		printf("done\n");
	}
}

/* You need >4GB total ram, in kernel cmdline, use 'mem=1000m'
 * then this code will clone to absolute memory address 0xe0000000
 * which can be read using a mmap tool at that offset.
 * Real ME memory is located around top of memory minus 64MB. (I think)
 * so we avoid cloning to this part.
 */
static void dump_me_memory() {
	uint32_t me_clone = 0x60000000;
	uint8_t *dump;

	dump = map_physical_exact((off_t)me_clone, (void *)me_clone, 0x2000000);
	zeroit(dump, 0x2000000);
	printf("Send magic command for memory clone\n");

	mei_reset();
	usleep(ME_COMMAND_DELAY);
	void* ptr = &me_clone;
	int err = mkhi_debug_me_memory(ptr);

	if (!err) {
		printf("Wait a second...");
		usleep(ME_COMMAND_DELAY);
		printf("done\n\nHere are the first bytes:\n");
		dumpmemfile(dump, 0x2000000);
		//printf("Try reading 0x%zx with other mmap tool...\n"
		//	"Press enter to quit, you only get one chance to run this tool before reboot required for some reason\n", me_clone);
		while (getc(stdin) != '\n') {};
		unmap_physical(dump, 0x2000000);
	}
}

static int pci_platform_scan() {
	struct pci_access *pacc;
	struct pci_dev *dev;
	char namebuf[1024];
	const char *name;

	pacc = pci_alloc();
	pacc->method = PCI_ACCESS_I386_TYPE1;

	pci_init(pacc);
	pci_scan_bus(pacc);

	for (dev=pacc->devices; dev; dev=dev->next) {
		pci_fill_info(dev, PCI_FILL_IDENT | PCI_FILL_BASES | PCI_FILL_SIZES | PCI_FILL_CLASS);
		name = pci_lookup_name(pacc, namebuf, sizeof(namebuf),
			PCI_LOOKUP_DEVICE, dev->vendor_id, dev->device_id);
		if (dev->vendor_id == 0x8086) {
			if (PCI_DEV_HAS_ME_DISABLE(dev->device_id)) {
				printf(CGRN "Good news, you have a `%s` so ME is present but can be disabled, continuing...\n\n" RESET, name);
				break;
			} else if (PCI_DEV_HAS_ME_DIFFICULT(dev->device_id)) {
				printf(CRED "Bad news, you have a `%s` so you have ME hardware on board and you can't control or disable it, continuing...\n\n" RESET, name);
				break;
			} else if (PCI_DEV_CAN_DISABLE_ME_IF_PRESENT(dev->device_id)) {
				printf(CYEL "Not sure if ME hardware is present because you have a `%s`, but it is possible to disable it if you do, continuing...\n\n" RESET, name);
				break;
			} else if (PCI_DEV_ME_NOT_SURE(dev->device_id)) {
				printf(CYEL "Found `%s`. Not sure whether you have ME hardware, exiting\n\n" RESET, name);
				pci_cleanup(pacc);
				return 1;
				break;
			}
		}
	}

	if (dev != NULL &&
	!PCI_DEV_HAS_ME_DISABLE(dev->device_id) &&
	!PCI_DEV_HAS_ME_DIFFICULT(dev->device_id) &&
	!PCI_DEV_CAN_DISABLE_ME_IF_PRESENT(dev->device_id) &&
	!PCI_DEV_ME_NOT_SURE(dev->device_id)) {
		printf(CCYN "ME is not present on your board or unkown\n\n" RESET);
		pci_cleanup(pacc);
		return 1;
	}

	pci_cleanup(pacc);

	return 0;
}

static struct pci_dev *pci_me_interface_scan(const char **name, char *namebuf, int namebuf_size) {
	struct pci_access *pacc;
	struct pci_dev *dev;
	int me = 0;

	pacc = pci_alloc();
	pacc->method = PCI_ACCESS_I386_TYPE1;

	pci_init(pacc);
	pci_scan_bus(pacc);

	for (dev=pacc->devices; dev; dev=dev->next) {
		pci_fill_info(dev, PCI_FILL_IDENT | PCI_FILL_BASES | PCI_FILL_SIZES | PCI_FILL_CLASS);
		*name = pci_lookup_name(pacc, namebuf, namebuf_size,
			PCI_LOOKUP_DEVICE, dev->vendor_id, dev->device_id);
		if (dev->vendor_id == 0x8086) {
			if (PCI_DEV_HAS_SUPPORTED_ME(dev->device_id)) {
				me = 1;
				break;
			}
		}
	}

	if (!me) {
		rehide_me();

		printf("MEI device not found\n");
		pci_cleanup(pacc);
		return NULL;
	}

	return dev;
}

static int activate_me() {
	struct pci_access *pacc;
	struct pci_dev *sb;
	uint32_t rcba_phys;

	pacc = pci_alloc();
	pacc->method = PCI_ACCESS_I386_TYPE1;

	pci_init(pacc);
	pci_scan_bus(pacc);

	sb = pci_get_dev(pacc, 0, 0, 0x1f, 0);
	if (!sb) {
		printf("Uh oh, southbridge not on BDF(0:31:0), please report this error, exiting.\n");
		pci_cleanup(pacc);
		return 1;
	}
	pci_fill_info(sb, PCI_FILL_IDENT | PCI_FILL_BASES | PCI_FILL_SIZES | PCI_FILL_CLASS);

	rcba_phys = pci_read_long(sb, 0xf0) & 0xfffffffe;
	rcba = map_physical((off_t)rcba_phys, size);

	//printf("RCBA at 0x%08" PRIx32 "\n", (uint32_t)rcba_phys);
	fd2 = *(uint32_t *)(rcba + FD2);
	*(uint32_t *)(rcba + FD2) = fd2 & ~0x2;
	if (fd2 & 0x2) {
		printf("MEI was hidden on PCI, now unlocked\n");
	} else {
		printf("MEI not hidden on PCI, checking if visible\n");
	}

	pci_cleanup(pacc);

	return 0;
}

static void dump_me_info() {
	struct pci_dev *dev;
	uint32_t stat, stat2;
	char namebuf[1024];
	const char *name;

	if (pci_platform_scan()) {
		exit(1);
	}

	if (activate_me()) {
		exit(1);
	}

	dev = pci_me_interface_scan(&name, namebuf, sizeof(namebuf));
	if (!dev) {
		exit(1);
	}

	printf("MEI found: [%x:%x] %s\n\n", dev->vendor_id, dev->device_id, name);
	stat = pci_read_long(dev, 0x40);
	printf("ME Status   : 0x%x\n", stat);
	stat2 = pci_read_long(dev, 0x48);
	printf("ME Status 2 : 0x%x\n\n", stat2);

	intel_me_status(stat, stat2);
	printf("\n");
	intel_me_extend_valid(dev);
	printf("\n");

	if ((stat & 0xf000) >> 12 != 0) {
		printf("ME: has a broken implementation on your board with this BIOS\n");
	}

	intel_mei_setup(dev);
	usleep(ME_COMMAND_DELAY);
	mei_reset();
	usleep(ME_COMMAND_DELAY);
	mkhi_get_fw_version();
	usleep(ME_COMMAND_DELAY);
	mei_reset();
	usleep(ME_COMMAND_DELAY);
	mkhi_get_fwcaps();
	usleep(ME_COMMAND_DELAY);

	rehide_me();

	munmap((void*)rcba, size);
}

static void print_version(void)
{
	printf("intelmetool v%s -- ", INTELMETOOL_VERSION);
	printf("Copyright (C) 2015 Damien Zammit\n\n");
	printf(
		"This program is free software: you can redistribute it and/or modify\n"
		"it under the terms of the GNU General Public License as published by\n"
		"the Free Software Foundation, version 2 of the License.\n\n"
		"This program is distributed in the hope that it will be useful,\n"
		"but WITHOUT ANY WARRANTY; without even the implied warranty of\n"
		"MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the\n"
		"GNU General Public License for more details.\n\n");
}

static void print_usage(const char *name)
{
	printf("usage: %s [-vh?sd]\n", name);
	printf("\n"
			 "   -v | --version:                   print the version\n"
			 "   -h | --help:                      print this help\n\n"
			 "   -s | --show:                      dump all me information on console\n"
			 "   -d | --debug:                     enable debug output\n"
			 "\n");
	exit(1);
}

int main(int argc, char *argv[])
{
	int opt, option_index = 0;
	unsigned cmd_exec = 0;

	static struct option long_options[] = {
		{"version", 0, 0, 'v'},
		{"help", 0, 0, 'h'},
		{"show", 0, 0, 's'},
		{"debug", 0, 0, 'd'},
		{0, 0, 0, 0}
	};

	while ((opt = getopt_long(argc, argv, "vh?sd",
	                                long_options, &option_index)) != EOF) {
	switch (opt) {
		case 'v':
			print_version();
			exit(0);
			break;
		case 's':
			cmd_exec = 1;
			break;
		case 'd':
			debug = 1;
			break;
		case 'h':
		case '?':
		default:
			print_usage(argv[0]);
			exit(0);
			break;
			}
		}

	#if defined(__FreeBSD__)
		if (open("/dev/io", O_RDWR) < 0) {
			perror("/dev/io");
	#elif defined(__NetBSD__)
	# ifdef __i386__
		if (i386_iopl(3)) {
			perror("iopl");
	# else
		if (x86_64_iopl(3)) {
			perror("iopl");
	# endif
	#else
		if (iopl(3)) {
			perror("iopl");
	#endif
			printf("You need to be root.\n");
			exit(1);
		}

	#ifndef __DARWIN__
		if ((fd_mem = open("/dev/mem", O_RDWR)) < 0) {
			perror("Can not open /dev/mem");
			exit(1);
		}
	#endif

	switch(cmd_exec) {
		case 1:
			dump_me_info();
			break;
		default:
			print_usage(argv[0]);
			break;
	}

	return 0;
}