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efi_loader: add DeployedMode and AuditMode variable measurement

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This commit adds the DeployedMode and AuditMode variable
measurement required in TCG PC Client Platform Firmware
Profile Specification.

Signed-off-by: Masahisa Kojima <masahisa.kojima@linaro.org>
This commit is contained in:
Masahisa Kojima 2021-10-26 17:27:27 +09:00 committed by Heinrich Schuchardt
parent 96485d2f3f
commit 65aa259aa7
1 changed files with 25 additions and 8 deletions
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33
lib/efi_loader/efi_tcg2.c
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@ -84,16 +84,19 @@ static const struct digest_info hash_algo_list[] = {
struct variable_info {
const u16 *name;
bool accept_empty;
u32 pcr_index;
};
static struct variable_info secure_variables[] = {
{u"SecureBoot", true},
{u"PK", true},
{u"KEK", true},
{u"db", true},
{u"dbx", true},
{u"dbt", false},
{u"dbr", false},
{u"SecureBoot", true, 7},
{u"PK", true, 7},
{u"KEK", true, 7},
{u"db", true, 7},
{u"dbx", true, 7},
{u"dbt", false, 7},
{u"dbr", false, 7},
{u"DeployedMode", false, 1},
{u"AuditMode", false, 1},
};
#define MAX_HASH_COUNT ARRAY_SIZE(hash_algo_list)
@ -1822,6 +1825,15 @@ static efi_status_t tcg2_measure_secure_boot_variable(struct udevice *dev)
efi_uintn_t data_size;
u32 count, i;
efi_status_t ret;
u8 deployed_mode;
efi_uintn_t size;
u32 deployed_audit_pcr_index = 1;
size = sizeof(deployed_mode);
ret = efi_get_variable_int(u"DeployedMode", &efi_global_variable_guid,
NULL, &size, &deployed_mode, NULL);
if (ret != EFI_SUCCESS || !deployed_mode)
deployed_audit_pcr_index = 7;
count = ARRAY_SIZE(secure_variables);
for (i = 0; i < count; i++) {
@ -1833,7 +1845,12 @@ static efi_status_t tcg2_measure_secure_boot_variable(struct udevice *dev)
if (!data && !secure_variables[i].accept_empty)
continue;
ret = tcg2_measure_variable(dev, 7,
if (u16_strcmp(u"DeployedMode", secure_variables[i].name))
secure_variables[i].pcr_index = deployed_audit_pcr_index;
if (u16_strcmp(u"AuditMode", secure_variables[i].name))
secure_variables[i].pcr_index = deployed_audit_pcr_index;
ret = tcg2_measure_variable(dev, secure_variables[i].pcr_index,
EV_EFI_VARIABLE_DRIVER_CONFIG,
secure_variables[i].name, guid,
data_size, data);