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
|
/* SPDX-License-Identifier: GPL-2.0-or-later */
/* This file is part of the coreboot project. */
#include <boot_device.h>
#include <commonlib/region.h>
#include <console/console.h>
#include <bootstate.h>
#include <fmap.h>
/*
* Enables read- /write protection of the bootmedia.
*/
void boot_device_security_lockdown(void)
{
const struct region_device *rdev = NULL;
struct region_device dev;
enum bootdev_prot_type lock_type;
printk(BIOS_DEBUG, "BM-LOCKDOWN: Enabling boot media protection scheme ");
if (CONFIG(BOOTMEDIA_LOCK_CONTROLLER)) {
if (CONFIG(BOOTMEDIA_LOCK_WHOLE_RO)) {
printk(BIOS_DEBUG, "'readonly'");
lock_type = CTRLR_WP;
} else if (CONFIG(BOOTMEDIA_LOCK_WHOLE_NO_ACCESS)) {
printk(BIOS_DEBUG, "'no access'");
lock_type = CTRLR_RWP;
} else if (CONFIG(BOOTMEDIA_LOCK_WPRO_VBOOT_RO)) {
printk(BIOS_DEBUG, "'WP_RO only'");
lock_type = CTRLR_WP;
}
printk(BIOS_DEBUG, "using CTRL...\n");
} else {
if (CONFIG(BOOTMEDIA_LOCK_WHOLE_RO)) {
printk(BIOS_DEBUG, "'readonly'");
lock_type = MEDIA_WP;
} else if (CONFIG(BOOTMEDIA_LOCK_WPRO_VBOOT_RO)) {
printk(BIOS_DEBUG, "'WP_RO only'");
lock_type = MEDIA_WP;
}
printk(BIOS_DEBUG, "using flash chip...\n");
}
if (CONFIG(BOOTMEDIA_LOCK_WPRO_VBOOT_RO)) {
if (fmap_locate_area_as_rdev("WP_RO", &dev) < 0)
printk(BIOS_ERR, "BM-LOCKDOWN: Could not find region 'WP_RO'\n");
else
rdev = &dev;
} else {
rdev = boot_device_ro();
}
if (rdev && boot_device_wp_region(rdev, lock_type) >= 0)
printk(BIOS_INFO, "BM-LOCKDOWN: Enabled bootmedia protection\n");
else
printk(BIOS_ERR, "BM-LOCKDOWN: Failed to enable bootmedia protection\n");
}
static void lock(void *unused)
{
boot_device_security_lockdown();
}
/*
* Keep in sync with mrc_cache.c
*/
#if CONFIG(MRC_WRITE_NV_LATE)
BOOT_STATE_INIT_ENTRY(BS_OS_RESUME_CHECK, BS_ON_EXIT, lock, NULL);
#else
BOOT_STATE_INIT_ENTRY(BS_DEV_RESOURCES, BS_ON_ENTRY, lock, NULL);
#endif
|
