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util/intelmetool: Fix the BootGuard dump feature

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Read the correct bits for measured and verified boot, print information
about some other bits.

Signed-off-by: Pablo Stebler <pablo@stebler.xyz>
Change-Id: Ie79d6da33032aee94d716bf0698b5501bbc424fa
Reviewed-on: https://review.coreboot.org/c/coreboot/+/45516
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
This commit is contained in:
Pablo Stebler
2020-09-18 10:32:22 +02:00
committed by Angel Pons
parent ca128a0eb4
commit 9ac91d220f
5 changed files with 71 additions and 64 deletions
Download Patch File Download Diff File Expand all files Collapse all files

107
util/intelmetool/intelmetool.c
View File

@ -314,12 +314,16 @@ out:
rehide_me();
}
static void print_btg_bool_param(const char *name, u8 state)
{
printf("%-20s : %s\n", name, state ? "ON" : "OFF");
}
static void dump_bootguard_info(void)
{
struct pci_dev *dev;
char namebuf[1024];
const char *name = NULL;
uint64_t bootguard = 0;
if (pci_platform_scan())
return;
@ -342,59 +346,74 @@ static void dump_bootguard_info(void)
if (ME_major_ver &&
(ME_major_ver < 9 ||
(ME_major_ver == 9 && ME_minor_ver < 5))) {
print_cap("BootGuard ", 0);
printf(CGRN "\nYour system isn't bootguard ready. You can "
"flash other firmware!\n" RESET);
printf(CGRN "Your system isn't BootGuard ready.\n"
"You can flash other firmware!\n" RESET);
rehide_me();
return;
}
if (msr_bootguard(&bootguard, debug) < 0) {
printf("ME Capability: %-43s: " CCYN "%s\n" RESET,
"BootGuard Mode", "Unknown");
rehide_me();
return;
}
if (debug) {
printf("BootGuard MSR Output: 0x%" PRIx64 "\n", bootguard);
bootguard &= ~0xff;
}
print_cap("BootGuard ", 1);
if (pci_read_long(dev, 0x40) & 0x10)
printf(CYEL "Your southbridge configuration is insecure!! "
printf(CYEL "Your southbridge configuration is insecure!!\n"
"BootGuard keys can be overwritten or wiped, or you are "
"in developer mode.\n"
RESET);
rehide_me();
switch (bootguard) {
case BOOTGUARD_DISABLED:
printf("ME Capability: %-43s: " CGRN "%s\n" RESET,
"BootGuard Mode", "Disabled");
printf(CGRN "\nYour system is bootguard ready but your vendor "
"disabled it. You can flash other firmware!\n" RESET);
break;
case BOOTGUARD_ENABLED_COMBI_MODE:
printf("ME Capability: %-43s: " CGRN "%s\n" RESET,
"BootGuard Mode", "Verified & Measured Boot");
printf(CRED "\nVerified boot is enabled. You can't flash other "
"firmware. !\n" RESET);
break;
case BOOTGUARD_ENABLED_MEASUREMENT_MODE:
printf("ME Capability: %-43s: " CGRN "%s\n" RESET,
"BootGuard Mode", "Measured Boot");
printf(CGRN "\nYour system is bootguard ready but only running "
"the measured boot mode. You can flash other firmware!\n"
RESET);
break;
case BOOTGUARD_ENABLED_VERIFIED_MODE:
printf("ME Capability: %-43s: " CGRN "%s\n" RESET,
"BootGuard Mode", "Verified Boot");
printf(CRED "\nVerified boot is enabled! You can't flash other "
"firmware.\n" RESET);
break;
union {
struct {
u8 nem_enabled : 1; /* [ 0.. 0] */
u8 tpm_type : 2; /* [ 2.. 1] */
u8 tpm_success : 1; /* [ 3.. 3] */
u8 facb_fpf : 1; /* [ 4.. 4] */
u8 measured_boot : 1; /* [ 5.. 5] */
u8 verified_boot : 1; /* [ 6.. 6] */
u8 module_revoked : 1; /* [ 7.. 7] */
u32 : 24;
u8 btg_capability : 1; /* [32..32] */
u32 : 31;
};
u64 raw;
} btg;
if (msr_bootguard(&btg.raw) < 0) {
printf("Could not read the BOOTGUARD_SACM_INFO MSR.\n");
return;
}
printf("BootGuard MSR Output : 0x%" PRIx64 "\n", btg.raw);
if (!btg.btg_capability) {
printf(CGRN "Your system isn't BootGuard ready.\n"
"You can flash other firmware!\n" RESET);
return;
}
print_btg_bool_param("Measured boot", btg.measured_boot);
print_btg_bool_param("Verified boot", btg.verified_boot);
print_btg_bool_param("FACB in FPFs", btg.facb_fpf);
print_btg_bool_param("Module revoked", btg.module_revoked);
if (btg.measured_boot) {
const char *const tpm_type_strs[] = {
"None",
"TPM 1.2",
"TPM 2.0",
"PTT",
};
printf("%-20s : %s\n", "TPM type", tpm_type_strs[btg.tpm_type]);
print_btg_bool_param("TPM success", btg.tpm_success);
}
if (btg.verified_boot) {
print_btg_bool_param("NEM enabled", btg.nem_enabled);
if (btg.nem_enabled)
printf(CRED "Verified boot is enabled and ACM has enabled "
"Cache-As-RAM.\nYou can't flash other firmware!\n" RESET);
else
printf(CYEL "Verified boot is enabled, but ACM did not enable "
"Cache-As-RAM.\nIt might be possible to flash other firmware.\n"
RESET);
} else {
printf(CGRN "Your system is BootGuard ready but verified boot is disabled.\n"
"You can flash other firmware!\n" RESET);
}
}