efi_selftest: add selftests for loadfile2 used to load initramfs

Provide a unit test loading an initial ramdisk using the
EFI_LOAD_FILE2_PROTOCOL. The test is only executed on request.

An example usage - given a file image with a file system in partition 1
holding file initrd - is:

* Configure the sandbox with

  CONFIG_EFI_SELFTEST=y
  CONFIG_EFI_LOAD_FILE2_INITRD=y
  CONFIG_EFI_INITRD_FILESPEC="host 0:1 initrd"

* Run ./u-boot and execute

    host bind 0 image
    setenv efi_selftest load initrd
    bootefi selftest

This would provide a test output like:

    Testing EFI API implementation

    Selected test: 'load initrd'

    Setting up 'load initrd'
    Setting up 'load initrd' succeeded

    Executing 'load initrd'
    Loaded 12378613 bytes
    CRC32 2997478465
    Executing 'load initrd' succeeded

Now the size and CRC32 can be compared to the provided file.

Signed-off-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>
Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>

2 files changed, 221 insertions, 0 deletions

diff --git a/lib/efi_selftest/Makefile b/lib/efi_selftest/Makefile
index 3ad96e1..cf132c3 100644
--- a/lib/efi_selftest/Makefile
+++ b/lib/efi_selftest/Makefile
@@ -49,6 +49,7 @@ obj-$(CONFIG_CPU_V7) += efi_selftest_unaligned.o
 obj-$(CONFIG_EFI_LOADER_HII) += efi_selftest_hii.o
 obj-$(CONFIG_EFI_RNG_PROTOCOL) += efi_selftest_rng.o
 obj-$(CONFIG_EFI_GET_TIME) += efi_selftest_rtc.o
+obj-$(CONFIG_EFI_LOAD_FILE2_INITRD) += efi_selftest_load_initrd.o
 
 ifeq ($(CONFIG_GENERATE_ACPI_TABLE),)
 obj-y += efi_selftest_fdt.o
diff --git a/lib/efi_selftest/efi_selftest_load_initrd.c b/lib/efi_selftest/efi_selftest_load_initrd.c
new file mode 100644
index 0000000..e16163c
--- /dev/null
+++ b/lib/efi_selftest/efi_selftest_load_initrd.c
@@ -0,0 +1,220 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * efi_selftest_load_initrd
+ *
+ * Copyright (c) 2020 Ilias Apalodimas <ilias.apalodimas@linaro.org>
+ *
+ * This test checks the FileLoad2 protocol.
+ * A known file is read from the file system and verified.
+ *
+ * An example usage - given a file image with a file system in partition 1
+ * holding file initrd - is:
+ *
+ * * Configure the sandbox with
+ *
+ *   CONFIG_EFI_SELFTEST=y
+ *   CONFIG_EFI_LOAD_FILE2_INITRD=y
+ *   CONFIG_EFI_INITRD_FILESPEC="host 0:1 initrd"
+ *
+ * * Run ./u-boot and execute
+ *
+ *   host bind 0 image
+ *   setenv efi_selftest load initrd
+ *   bootefi selftest
+ *
+ * This would provide a test output like:
+ *
+ *   Testing EFI API implementation
+ *
+ *   Selected test: 'load initrd'
+ *
+ *   Setting up 'load initrd'
+ *   Setting up 'load initrd' succeeded
+ *
+ *   Executing 'load initrd'
+ *   Loaded 12378613 bytes
+ *   CRC32 2997478465
+ *
+ * Now the size and CRC32 can be compared to the provided file.
+ */
+
+#include <efi_selftest.h>
+#include <efi_loader.h>
+#include <efi_load_initrd.h>
+
+static struct efi_boot_services *boottime;
+
+static struct efi_initrd_dp dp = {
+	.vendor = {
+		{
+		   DEVICE_PATH_TYPE_MEDIA_DEVICE,
+		   DEVICE_PATH_SUB_TYPE_VENDOR_PATH,
+		   sizeof(dp.vendor),
+		},
+		EFI_INITRD_MEDIA_GUID,
+	},
+	.end = {
+		DEVICE_PATH_TYPE_END,
+		DEVICE_PATH_SUB_TYPE_END,
+		sizeof(dp.end),
+	}
+};
+
+static struct efi_initrd_dp dp_invalid = {
+	.vendor = {
+		{
+		   DEVICE_PATH_TYPE_MEDIA_DEVICE,
+		   DEVICE_PATH_SUB_TYPE_VENDOR_PATH,
+		   sizeof(dp.vendor),
+		},
+		EFI_INITRD_MEDIA_GUID,
+	},
+	.end = {
+		0x8f, /* invalid */
+		0xfe, /* invalid */
+		sizeof(dp.end),
+	}
+};
+
+static int setup(const efi_handle_t handle,
+		 const struct efi_system_table *systable)
+{
+	boottime = systable->boottime;
+
+	return EFI_ST_SUCCESS;
+}
+
+static int execute(void)
+{
+	efi_guid_t lf2_proto_guid = EFI_LOAD_FILE2_PROTOCOL_GUID;
+	struct efi_load_file_protocol *lf2;
+	struct efi_device_path *dp2, *dp2_invalid;
+	efi_status_t status;
+	efi_handle_t handle;
+	char buffer[64];
+	efi_uintn_t buffer_size;
+	void *buf;
+	u32 crc32;
+
+	memset(buffer, 0, sizeof(buffer));
+
+	dp2 = (struct efi_device_path *)&dp;
+	status = boottime->locate_device_path(&lf2_proto_guid, &dp2, &handle);
+	if (status != EFI_SUCCESS) {
+		efi_st_error("Unable to locate device path\n");
+		return EFI_ST_FAILURE;
+	}
+
+	status = boottime->handle_protocol(handle, &lf2_proto_guid,
+					   (void **)&lf2);
+	if (status != EFI_SUCCESS) {
+		efi_st_error("Unable to locate protocol\n");
+		return EFI_ST_FAILURE;
+	}
+
+	/* Case 1:
+	 * buffer_size can't be NULL
+	 * protocol can't be NULL
+	 */
+	status = lf2->load_file(lf2, dp2, false, NULL, &buffer);
+	if (status != EFI_INVALID_PARAMETER) {
+		efi_st_error("Buffer size can't be NULL\n");
+		return EFI_ST_FAILURE;
+	}
+	buffer_size = sizeof(buffer);
+	status = lf2->load_file(NULL, dp2, false, &buffer_size, &buffer);
+	if (status != EFI_INVALID_PARAMETER) {
+		efi_st_error("Protocol can't be NULL\n");
+		return EFI_ST_FAILURE;
+	}
+
+	/*
+	 * Case 2: Match end node type/sub-type on device path
+	 */
+	dp2_invalid = (struct efi_device_path *)&dp_invalid;
+	buffer_size = sizeof(buffer);
+	status = lf2->load_file(lf2, dp2_invalid, false, &buffer_size, &buffer);
+	if (status != EFI_INVALID_PARAMETER) {
+		efi_st_error("Invalid device path type must return EFI_INVALID_PARAMETER\n");
+		return EFI_ST_FAILURE;
+	}
+
+	status = lf2->load_file(lf2, dp2_invalid, false, &buffer_size, &buffer);
+	if (status != EFI_INVALID_PARAMETER) {
+		efi_st_error("Invalid device path sub-type must return EFI_INVALID_PARAMETER\n");
+		return EFI_ST_FAILURE;
+	}
+
+	/*
+	 * Case 3:
+	 * BootPolicy 'true' must return EFI_UNSUPPORTED
+	 */
+	buffer_size = sizeof(buffer);
+	status = lf2->load_file(lf2, dp2, true, &buffer_size, &buffer);
+	if (status != EFI_UNSUPPORTED) {
+		efi_st_error("BootPolicy true must return EFI_UNSUPPORTED\n");
+		return EFI_ST_FAILURE;
+	}
+
+	/*
+	 * Case: Pass buffer size as zero, firmware must return
+	 * EFI_BUFFER_TOO_SMALL and an appropriate size
+	 */
+	buffer_size = 0;
+	status = lf2->load_file(lf2, dp2, false, &buffer_size, NULL);
+	if (status != EFI_BUFFER_TOO_SMALL || !buffer_size) {
+		efi_st_printf("buffer_size: %u\n", (unsigned int)buffer_size);
+		efi_st_printf("status: %x\n", (unsigned int)status);
+		efi_st_error("Buffer size not updated\n");
+		return EFI_ST_FAILURE;
+	}
+
+	/*
+	 * Case: Pass buffer size as smaller than the file_size,
+	 * firmware must return * EFI_BUFFER_TOO_SMALL and an appropriate size
+	 */
+	buffer_size = 1;
+	status = lf2->load_file(lf2, dp2, false, &buffer_size, &buffer);
+	if (status != EFI_BUFFER_TOO_SMALL || buffer_size <= 1) {
+		efi_st_error("Buffer size not updated\n");
+		return EFI_ST_FAILURE;
+	}
+
+	status = boottime->allocate_pool(EFI_BOOT_SERVICES_DATA, buffer_size,
+					 &buf);
+	if (status != EFI_SUCCESS) {
+		efi_st_error("Cannot allocate buffer\n");
+		return EFI_ST_FAILURE;
+	}
+
+	/* Case: Pass correct buffer, load the file and verify checksum*/
+	status = lf2->load_file(lf2, dp2, false, &buffer_size, buf);
+	if (status != EFI_SUCCESS) {
+		efi_st_error("Loading initrd failed\n");
+		return EFI_ST_FAILURE;
+	}
+
+	efi_st_printf("Loaded %u bytes\n", (unsigned int)buffer_size);
+	status = boottime->calculate_crc32(buf, buffer_size, &crc32);
+	if (status != EFI_SUCCESS) {
+		efi_st_error("Could not determine CRC32\n");
+		return EFI_ST_FAILURE;
+	}
+	efi_st_printf("CRC32 %u\n", (unsigned int)crc32);
+
+	status = boottime->free_pool(buf);
+	if (status != EFI_SUCCESS) {
+		efi_st_error("Cannot free buffer\n");
+		return EFI_ST_FAILURE;
+	}
+
+	return EFI_ST_SUCCESS;
+}
+
+EFI_UNIT_TEST(load_initrd) = {
+	.name = "load initrd",
+	.phase = EFI_EXECUTE_BEFORE_BOOTTIME_EXIT,
+	.setup = setup,
+	.execute = execute,
+	.on_request = true,
+};