Pull request for UEFI sub-system for efi-2020-04-rc4 (2)

In Linux next-20200228 patches have been merged to load an initial ramdisk
 using an EFI_LOAD_FILE2_PROTOCOL provided by the firmware. See commit
 ec93fc371f01 ("efi/libstub: Add support for loading the initrd from a
 device path"). The idea behind it is that the firmware should be
 responsible for validating the initrd in a secure boot setup.
 
 This pull-request comprises a patch series which let's U-Boot provide an
 initial implementation of the EFI_LOAD_FILE2_PROTOCOL providing the initrd.
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Merge tag 'efi-2020-04-rc4-2' of https://gitlab.denx.de/u-boot/custodians/u-boot-efi

Pull request for UEFI sub-system for efi-2020-04-rc4 (2)

In Linux next-20200228 patches have been merged to load an initial ramdisk
using an EFI_LOAD_FILE2_PROTOCOL provided by the firmware. See commit
ec93fc371f01 ("efi/libstub: Add support for loading the initrd from a
device path"). The idea behind it is that the firmware should be
responsible for validating the initrd in a secure boot setup.

This pull-request comprises a patch series which let's U-Boot provide an
initial implementation of the EFI_LOAD_FILE2_PROTOCOL providing the initrd.

cmd/efidebug.c

@@ -243,6 +243,10 @@ static const struct {
 		"HII Config Routing",
 		EFI_HII_CONFIG_ROUTING_PROTOCOL_GUID,
 	},
+	{
+		"Load File2",
+		EFI_LOAD_FILE2_PROTOCOL_GUID,
+	},
 	{
 		"Simple Network",
 		EFI_SIMPLE_NETWORK_PROTOCOL_GUID,

doc/api/efi.rst

@@ -125,6 +125,15 @@ Graphical output protocol
 .. kernel-doc:: lib/efi_loader/efi_gop.c
    :internal:
 
+Load file 2 protocol
+~~~~~~~~~~~~~~~~~~~~
+
+The load file 2 protocol can be used by the Linux kernel to load the initial
+RAM disk. U-Boot can be configured to provide an implementation.
+
+.. kernel-doc:: lib/efi_loader/efi_load_initrd.c
+   :internal:
+
 Network protocols
 ~~~~~~~~~~~~~~~~~
 

doc/uefi/uefi.rst

@@ -356,6 +356,18 @@ This driver is only available if U-Boot is configured with::
     CONFIG_BLK=y
     CONFIG_PARTITIONS=y
 
+Miscellaneous
+-------------
+
+Load file 2 protocol
+~~~~~~~~~~~~~~~~~~~~
+
+The load file 2 protocol can be used by the Linux kernel to load the initial
+RAM disk. U-Boot can be configured to provide an implementation with::
+
+    EFI_LOAD_FILE2_INITRD=y
+    EFI_INITRD_FILESPEC=interface dev:part path_to_initrd
+
 Links
 -----
 

include/efi_api.h

@@ -331,6 +331,14 @@ struct efi_runtime_services {
 	EFI_GUID(0xeb9d2d31, 0x2d88, 0x11d3,  \
 		 0x9a, 0x16, 0x00, 0x90, 0x27, 0x3f, 0xc1, 0x4d)
 
+#define EFI_LOAD_FILE_PROTOCOL_GUID \
+	EFI_GUID(0x56ec3091, 0x954c, 0x11d2, \
+		 0x8e, 0x3f, 0x00, 0xa0, 0xc9, 0x69, 0x72, 0x3b)
+
+#define EFI_LOAD_FILE2_PROTOCOL_GUID \
+	EFI_GUID(0x4006c0c1, 0xfcb3, 0x403e, \
+		 0x99, 0x6d, 0x4a, 0x6c, 0x87, 0x24, 0xe0, 0x6d)
+
 struct efi_configuration_table {
 	efi_guid_t guid;
 	void *table;
@@ -486,6 +494,7 @@ struct efi_device_path_nvme {
 #define DEVICE_PATH_TYPE_MEDIA_DEVICE		0x04
 #  define DEVICE_PATH_SUB_TYPE_HARD_DRIVE_PATH	0x01
 #  define DEVICE_PATH_SUB_TYPE_CDROM_PATH	0x02
+#  define DEVICE_PATH_SUB_TYPE_VENDOR_PATH	0x03
 #  define DEVICE_PATH_SUB_TYPE_FILE_PATH	0x04
 
 struct efi_device_path_hard_drive_path {
@@ -1619,6 +1628,14 @@ struct efi_unicode_collation_protocol {
 	char *supported_languages;
 };
 
+struct efi_load_file_protocol {
+	efi_status_t (EFIAPI *load_file)(struct efi_load_file_protocol *this,
+					 struct efi_device_path *file_path,
+					 bool boot_policy,
+					 efi_uintn_t *buffer_size,
+					 void *buffer);
+};
+
 /* Boot manager load options */
 #define LOAD_OPTION_ACTIVE		0x00000001
 #define LOAD_OPTION_FORCE_RECONNECT	0x00000002

include/efi_load_initrd.h

@@ -0,0 +1,25 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
+/*
+ * Copyright (c) 2020, Linaro Limited
+ */
+
+#if !defined _EFI_LOAD_INITRD_H_
+#define _EFI_LOAD_INITRD_H_
+
+#include <efi.h>
+#include <efi_api.h>
+
+/*
+ * Vendor GUID used by Linux to identify the handle with the
+ * EFI_LOAD_FILE2_PROTOCOL and load an initial ramdisk.
+ */
+#define EFI_INITRD_MEDIA_GUID \
+	EFI_GUID(0x5568e427, 0x68fc, 0x4f3d, \
+		 0xac, 0x74, 0xca, 0x55, 0x52, 0x31, 0xcc, 0x68)
+
+struct efi_initrd_dp {
+	struct efi_device_path_vendor vendor;
+	struct efi_device_path end;
+} __packed;
+
+#endif

include/efi_loader.h

@@ -378,6 +378,7 @@ efi_status_t efi_gop_register(void);
 efi_status_t efi_net_register(void);
 /* Called by bootefi to make the watchdog available */
 efi_status_t efi_watchdog_register(void);
+efi_status_t efi_initrd_register(void);
 /* Called by bootefi to make SMBIOS tables available */
 /**
  * efi_acpi_register() - write out ACPI tables

lib/efi_loader/Kconfig

@@ -130,4 +130,19 @@ config EFI_RNG_PROTOCOL
 	  Provide a EFI_RNG_PROTOCOL implementation using the hardware random
 	  number generator of the platform.
 
+config EFI_LOAD_FILE2_INITRD
+	bool "EFI_FILE_LOAD2_PROTOCOL for Linux initial ramdisk"
+	default n
+	help
+	  Expose a EFI_FILE_LOAD2_PROTOCOL that the Linux UEFI stub can
+	  use to load the initial ramdisk. Once this is enabled using
+	  initrd=<ramdisk> will stop working.
+
+config EFI_INITRD_FILESPEC
+	string "initramfs path"
+	default "host 0:1 initrd"
+	depends on EFI_LOAD_FILE2_INITRD
+	help
+	  Full path of the initramfs file, e.g. mmc 0:2 initramfs.cpio.gz.
+
 endif

lib/efi_loader/Makefile

@@ -43,3 +43,4 @@ obj-$(CONFIG_NET) += efi_net.o
 obj-$(CONFIG_GENERATE_ACPI_TABLE) += efi_acpi.o
 obj-$(CONFIG_GENERATE_SMBIOS_TABLE) += efi_smbios.o
 obj-$(CONFIG_EFI_RNG_PROTOCOL) += efi_rng.o
+obj-$(CONFIG_EFI_LOAD_FILE2_INITRD) += efi_load_initrd.o

lib/efi_loader/efi_load_initrd.c

@@ -0,0 +1,198 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (c) 2020, Linaro Limited
+ */
+
+#include <common.h>
+#include <env.h>
+#include <malloc.h>
+#include <mapmem.h>
+#include <dm.h>
+#include <fs.h>
+#include <efi_loader.h>
+#include <efi_load_initrd.h>
+
+static const efi_guid_t efi_guid_load_file2_protocol =
+		EFI_LOAD_FILE2_PROTOCOL_GUID;
+
+static efi_status_t EFIAPI
+efi_load_file2_initrd(struct efi_load_file_protocol *this,
+		      struct efi_device_path *file_path, bool boot_policy,
+		      efi_uintn_t *buffer_size, void *buffer);
+
+static const struct efi_load_file_protocol efi_lf2_protocol = {
+	.load_file = efi_load_file2_initrd,
+};
+
+/*
+ * Device path defined by Linux to identify the handle providing the
+ * EFI_LOAD_FILE2_PROTOCOL used for loading the initial ramdisk.
+ */
+static const 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),
+	}
+};
+
+/**
+ * get_file_size() - retrieve the size of initramfs, set efi status on error
+ *
+ * @dev:			device to read from. i.e "mmc"
+ * @part:			device partition. i.e "0:1"
+ * @file:			name fo file
+ * @status:			EFI exit code in case of failure
+ *
+ * Return:			size of file
+ */
+static loff_t get_file_size(const char *dev, const char *part, const char *file,
+			    efi_status_t *status)
+{
+	loff_t sz = 0;
+	int ret;
+
+	ret = fs_set_blk_dev(dev, part, FS_TYPE_ANY);
+	if (ret) {
+		*status = EFI_NO_MEDIA;
+		goto out;
+	}
+
+	ret = fs_size(file, &sz);
+	if (ret) {
+		sz = 0;
+		*status = EFI_NOT_FOUND;
+		goto out;
+	}
+
+out:
+	return sz;
+}
+
+/**
+ * load_file2() - get information about random number generation
+ *
+ * This function implement the LoadFile2() service in order to load an initram
+ * disk requested by the Linux kernel stub.
+ * See the UEFI spec for details.
+ *
+ * @this:			loadfile2 protocol instance
+ * @file_path:			relative path of the file. "" in this case
+ * @boot_policy:		must be false for Loadfile2
+ * @buffer_size:		size of allocated buffer
+ * @buffer:			buffer to load the file
+ *
+ * Return:			status code
+ */
+static efi_status_t EFIAPI
+efi_load_file2_initrd(struct efi_load_file_protocol *this,
+		      struct efi_device_path *file_path, bool boot_policy,
+		      efi_uintn_t *buffer_size, void *buffer)
+{
+	const char *filespec = CONFIG_EFI_INITRD_FILESPEC;
+	efi_status_t status = EFI_NOT_FOUND;
+	loff_t file_sz = 0, read_sz = 0;
+	char *dev, *part, *file;
+	char *s;
+	int ret;
+
+	EFI_ENTRY("%p, %p, %d, %p, %p", this, file_path, boot_policy,
+		  buffer_size, buffer);
+
+	s = strdup(filespec);
+	if (!s)
+		goto out;
+
+	if (!this || this != &efi_lf2_protocol ||
+	    !buffer_size) {
+		status = EFI_INVALID_PARAMETER;
+		goto out;
+	}
+
+	if (file_path->type != dp.end.type ||
+	    file_path->sub_type != dp.end.sub_type) {
+		status = EFI_INVALID_PARAMETER;
+		goto out;
+	}
+
+	if (boot_policy) {
+		status = EFI_UNSUPPORTED;
+		goto out;
+	}
+
+	/* expect something like 'mmc 0:1 initrd.cpio.gz' */
+	dev = strsep(&s, " ");
+	if (!dev)
+		goto out;
+	part = strsep(&s, " ");
+	if (!part)
+		goto out;
+	file = strsep(&s, " ");
+	if (!file)
+		goto out;
+
+	file_sz = get_file_size(dev, part, file, &status);
+	if (!file_sz)
+		goto out;
+
+	if (!buffer || *buffer_size < file_sz) {
+		status = EFI_BUFFER_TOO_SMALL;
+		*buffer_size = file_sz;
+	} else {
+		ret = fs_set_blk_dev(dev, part, FS_TYPE_ANY);
+		if (ret) {
+			status = EFI_NO_MEDIA;
+			goto out;
+		}
+
+		ret = fs_read(file, map_to_sysmem(buffer), 0, *buffer_size,
+			      &read_sz);
+		if (ret || read_sz != file_sz)
+			goto out;
+		*buffer_size = read_sz;
+
+		status = EFI_SUCCESS;
+	}
+
+out:
+	free(s);
+	return EFI_EXIT(status);
+}
+
+/**
+ * efi_initrd_register() - Register a handle and loadfile2 protocol
+ *
+ * This function creates a new handle and installs a linux specific GUID
+ * to handle initram disk loading during boot.
+ * See the UEFI spec for details.
+ *
+ * Return:			status code
+ */
+efi_status_t efi_initrd_register(void)
+{
+	efi_handle_t efi_initrd_handle = NULL;
+	efi_status_t ret;
+
+	/*
+	 * Set up the handle with the EFI_LOAD_FILE2_PROTOCOL which Linux may
+	 * use to load the initial ramdisk.
+	 */
+	ret = EFI_CALL(efi_install_multiple_protocol_interfaces
+		       (&efi_initrd_handle,
+			/* initramfs */
+			&efi_guid_device_path, &dp,
+			/* LOAD_FILE2 */
+			&efi_guid_load_file2_protocol,
+			(void *)&efi_lf2_protocol,
+			NULL));
+
+	return ret;
+}

lib/efi_loader/efi_setup.c

@@ -155,6 +155,11 @@ efi_status_t efi_init_obj_list(void)
 	if (ret != EFI_SUCCESS)
 		goto out;
 #endif
+#ifdef CONFIG_EFI_LOAD_FILE2_INITRD
+	ret = efi_initrd_register();
+	if (ret != EFI_SUCCESS)
+		goto out;
+#endif
 #ifdef CONFIG_NET
 	ret = efi_net_register();
 	if (ret != EFI_SUCCESS)

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

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,
+};