efi_selftest: unit test for EFI Conformance Profile Table

Add a new unit test to test the integrity of the
EFI Conformance Profile Table.

Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
Reviewed-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>

Author: xypron

lib/efi_selftest/Makefile

@@ -49,6 +49,7 @@ efi_selftest_variables.o \
 efi_selftest_variables_runtime.o \
 efi_selftest_watchdog.o
 
+obj-$(CONFIG_EFI_ECPT) += efi_selftest_ecpt.o
 obj-$(CONFIG_NET) += efi_selftest_snp.o
 
 obj-$(CONFIG_EFI_DEVICE_PATH_TO_TEXT) += efi_selftest_devicepath.o

lib/efi_selftest/efi_selftest_ecpt.c

@@ -0,0 +1,76 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * efi_selftest_fdt
+ *
+ * Copyright (c) 2022 Heinrich Schuchardt <xypron.glpk@gmx.de>
+ *
+ * Check the EFI_CONFORMANCE_PROFILE_TABLE
+ */
+
+#include <efi_selftest.h>
+
+static const efi_guid_t guid_ecpt = EFI_CONFORMANCE_PROFILES_TABLE_GUID;
+static const efi_guid_t guid_ebbr_2_0 = EFI_CONFORMANCE_PROFILE_EBBR_2_0_GUID;
+
+/*
+ * ecpt_find_guid() - find GUID in EFI Conformance Profile Table
+ *
+ * @ecpt:	EFI Conformance Profile Table
+ * @guid:	GUID to find
+ * Return:	EFI_ST_SUCCESS for success
+ */
+static int ecpt_find_guid(struct efi_conformance_profiles_table *ecpt,
+			  const efi_guid_t *guid) {
+	int i;
+
+	for (i = 0; i < ecpt->number_of_profiles; ++i) {
+		if (!memcmp(&ecpt->conformance_profiles[i], guid, 16))
+			return EFI_ST_SUCCESS;
+	}
+	efi_st_error("GUID %pU not found\n", guid);
+	return EFI_ST_FAILURE;
+}
+
+/*
+ * Execute unit test.
+ *
+ * Return:	EFI_ST_SUCCESS for success
+ */
+static int execute(void)
+{
+	struct efi_conformance_profiles_table *ecpt;
+	int expected_entries = 0;
+
+	ecpt = efi_st_get_config_table(&guid_ecpt);
+
+	if (!ecpt) {
+		efi_st_error("Missing EFI Conformance Profile Table\n");
+		return EFI_ST_FAILURE;
+	}
+
+	if (ecpt->version != EFI_CONFORMANCE_PROFILES_TABLE_VERSION) {
+		efi_st_error("Wrong table version\n");
+		return EFI_ST_FAILURE;
+	}
+
+	if (CONFIG_IS_ENABLED(EFI_EBBR_2_0_CONFORMANCE)) {
+		++expected_entries;
+		if (ecpt_find_guid(ecpt, &guid_ebbr_2_0))
+			return EFI_ST_FAILURE;
+	}
+
+	if (ecpt->number_of_profiles != expected_entries) {
+		efi_st_error("Expected %d entries, found %d\n",
+			     expected_entries, ecpt->number_of_profiles);
+		return EFI_ST_FAILURE;
+	}
+
+	return EFI_ST_SUCCESS;
+}
+
+
+EFI_UNIT_TEST(ecpt) = {
+	.name = "conformance profile table",
+	.phase = EFI_EXECUTE_BEFORE_BOOTTIME_EXIT,
+	.execute = execute,
+};