[PATCH v3 3/3] efi_loader: add DeployedMode and AuditMode variable measurement

[Masahisa Kojima]

This commit adds the DeployedMode and AuditMode variable
measurement required in TCG PC Client PFP Spec.

Signed-off-by: Masahisa Kojima <masahisa.kojima at linaro.org>
---

Changes in v3:
- read variable first, then mesure the variable

 lib/efi_loader/efi_tcg2.c | 50 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 50 insertions(+)

diff --git a/lib/efi_loader/efi_tcg2.c b/lib/efi_loader/efi_tcg2.c
index 28e0362bf2..7fba4bc458 100644
--- a/lib/efi_loader/efi_tcg2.c
+++ b/lib/efi_loader/efi_tcg2.c
@@ -12,6 +12,7 @@
 #include <dm.h>
 #include <efi_loader.h>
 #include <efi_tcg2.h>
+#include <efi_variable.h>
 #include <log.h>
 #include <malloc.h>
 #include <smbios.h>
@@ -1822,6 +1823,53 @@ out:
 	return ret;
 }
 
+/**
+ * tcg2_measure_deployed_audit_mode() - measure deployedmode and auditmode
+ *
+ * @dev:	TPM device
+ *
+ * Return:	status code
+ */
+static efi_status_t tcg2_measure_deployed_audit_mode(struct udevice *dev)
+{
+	u8 deployed_mode;
+	u8 audit_mode;
+	efi_uintn_t size;
+	efi_status_t ret;
+	u32 pcr_index;
+
+	size = sizeof(deployed_mode);
+	ret = efi_get_variable_int(L"DeployedMode", &efi_global_variable_guid,
+				   NULL, &size, &deployed_mode, NULL);
+	if (ret != EFI_SUCCESS)
+		return ret;
+
+	size = sizeof(audit_mode);
+	ret = efi_get_variable_int(L"AuditMode", &efi_global_variable_guid,
+				   NULL, &size, &audit_mode, NULL);
+	if (ret != EFI_SUCCESS)
+		return ret;
+
+	pcr_index = (deployed_mode ? 1 : 7);
+
+	ret = tcg2_measure_variable(dev, pcr_index,
+				    EV_EFI_VARIABLE_DRIVER_CONFIG,
+				    L"DeployedMode",
+				    &efi_global_variable_guid,
+				    size, &deployed_mode);
+	if (ret != EFI_SUCCESS)
+		return ret;
+
+
+	ret = tcg2_measure_variable(dev, pcr_index,
+				    EV_EFI_VARIABLE_DRIVER_CONFIG,
+				    L"AuditMode",
+				    &efi_global_variable_guid,
+				    size, &audit_mode);
+
+	return ret;
+}
+
 /**
  * tcg2_measure_secure_boot_variable() - measure secure boot variables
  *
@@ -1885,6 +1933,8 @@ static efi_status_t tcg2_measure_secure_boot_variable(struct udevice *dev)
 		free(data);
 	}
 
+	ret = tcg2_measure_deployed_audit_mode(dev);
+
 error:
 	return ret;
 }
-- 
2.17.1