Pull request for UEFI sub-system for efi-2021-04-rc2

Bug fixes:
 
 * do not allow creating of files with filenames on FAT file system
 * install UEFI System Partition GUID on ESP handle
 * in dtbdump.efi test tool use GUID to find ESP handle
 
 Documentation:
 
 * man-page for load command
 * describe end of life of plat_auto
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Merge tag 'efi-2021-04-rc2' of https://gitlab.denx.de/u-boot/custodians/u-boot-efi

Pull request for UEFI sub-system for efi-2021-04-rc2

Bug fixes:

* do not allow creating of files with filenames on FAT file system
* install UEFI System Partition GUID on ESP handle
* in dtbdump.efi test tool use GUID to find ESP handle

Documentation:

* man-page for load command
* describe end of life of plat_auto

cmd/efidebug.c

@@ -16,6 +16,7 @@
 #include <log.h>
 #include <malloc.h>
 #include <mapmem.h>
+#include <part.h>
 #include <search.h>
 #include <linux/ctype.h>
 
@@ -502,6 +503,10 @@ static const struct {
 		"Device-Tree Fixup",
 		EFI_DT_FIXUP_PROTOCOL_GUID,
 	},
+	{
+		"System Partition",
+		PARTITION_SYSTEM_GUID
+	},
 	/* Configuration table GUIDs */
 	{
 		"ACPI table",

doc/driver-model/design.rst

@@ -725,7 +725,7 @@ The steps are:
 
    2. If plat_auto is non-zero, then the platform data space
    is allocated. This is only useful for device tree operation, since
-   otherwise you would have to specific the platform data in the
+   otherwise you would have to specify the platform data in the
    U_BOOT_DRVINFO() declaration. The space is allocated for the device and
    zeroed. It will be accessible as dev->plat.
 
@@ -861,8 +861,8 @@ remove it. This performs the probe steps in reverse:
    be dynamically allocated, and thus needs to be deallocated during the
    remove() method, either:
 
-      - if the plat_auto is non-zero, the deallocation
+      - if the plat_auto is non-zero, the deallocation happens automatically
-        happens automatically within the driver model core; or
+        within the driver model core in the unbind stage; or
 
       - when plat_auto is 0, both the allocation (in probe()
         or preferably of_to_plat()) and the deallocation in remove()

doc/usage/exception.rst

@@ -61,8 +61,3 @@ Examples
     pc = 0x56076dd1a0f9, pc_reloc = 0x540f9
 
     resetting ...
-
-Return value
-------------
-
-The return value $? is always set to 0 (true).

doc/usage/index.rst

@@ -23,6 +23,7 @@ Shell commands
    exit
    false
    for
+   load
    loady
    mbr
    pstore

doc/usage/load.rst

@@ -0,0 +1,74 @@
+.. SPDX-License-Identifier: GPL-2.0+:
+
+load command
+============
+
+Synopsis
+--------
+
+::
+
+    load <interface> [<dev[:part]> [<addr> [<filename> [bytes [pos]]]]]
+
+Description
+-----------
+
+The load command is used to read a file from a filesystem into memory.
+
+The number of transferred bytes is saved in the environment variable filesize.
+The load address is saved in the environment variable fileaddr.
+
+interface
+    interface for accessing the block device (mmc, sata, scsi, usb, ....)
+
+dev
+    device number
+
+part
+    partition number, defaults to 0 (whole device)
+
+addr
+    load address, defaults to environment variable loadaddr or if loadaddr is
+    not set to configuration variable CONFIG_SYS_LOAD_ADDR
+
+filename
+    path to file, defaults to environment variable bootfile
+
+bytes
+    maximum number of bytes to load
+
+pos
+    number of bytes to skip
+
+addr, bytes, pos are hexadecimal numbers.
+
+Example
+-------
+
+::
+
+    => load mmc 0:1 ${kernel_addr_r} snp.efi
+    149280 bytes read in 11 ms (12.9 MiB/s)
+    =>
+    => load mmc 0:1 ${kernel_addr_r} snp.efi 1000000
+    149280 bytes read in 9 ms (15.8 MiB/s)
+    =>
+    => load mmc 0:1 ${kernel_addr_r} snp.efi 1000000 100
+    149024 bytes read in 10 ms (14.2 MiB/s)
+    =>
+    => load mmc 0:1 ${kernel_addr_r} snp.efi 10
+    16 bytes read in 1 ms (15.6 KiB/s)
+    =>
+
+Configuration
+-------------
+
+The load command is only available if CONFIG_CMD_FS_GENERIC=y.
+
+Return value
+------------
+
+The return value $? is set to 0 (true) if the file was successfully loaded
+even if the number of bytes is less then the specified length.
+
+If an error occurs, the return value $? is set to 1 (false).

fs/fat/fat_write.c

@@ -1237,12 +1237,38 @@ again:
 		}
 
 		*last_slash_cont = '\0';
-		*basename = last_slash_cont + 1;
+		filename = last_slash_cont + 1;
 	} else {
 		*dirname = "/"; /* root by default */
-		*basename = filename;
 	}
 
+	/*
+	 * The FAT32 File System Specification v1.03 requires leading and
+	 * trailing spaces as well as trailing periods to be ignored.
+	 */
+	for (; *filename == ' '; ++filename)
+		;
+
+	/* Keep special entries '.' and '..' */
+	if (filename[0] == '.' &&
+	    (!filename[1] || (filename[1] == '.' && !filename[2])))
+		goto done;
+
+	/* Remove trailing periods and spaces */
+	for (p = filename + strlen(filename) - 1; p >= filename; --p) {
+		switch (*p) {
+		case ' ':
+		case '.':
+			*p = 0;
+			break;
+		default:
+			goto done;
+		}
+	}
+
+done:
+	*basename = filename;
+
 	return 0;
 }
 
@@ -1259,8 +1285,10 @@ again:
 static int normalize_longname(char *l_filename, const char *filename)
 {
 	const char *p, illegal[] = "<>:\"/\\|?*";
+	size_t len;
 
-	if (strlen(filename) >= VFAT_MAXLEN_BYTES)
+	len = strlen(filename);
+	if (!len || len >= VFAT_MAXLEN_BYTES || filename[len - 1] == '.')
 		return -1;
 
 	for (p = filename; *p; ++p) {
@@ -1299,9 +1327,8 @@ int file_fat_write_at(const char *filename, loff_t pos, void *buffer,
 		goto exit;
 	}
 
-	filename = basename;
+	if (normalize_longname(l_filename, basename)) {
-	if (normalize_longname(l_filename, filename)) {
+		printf("FAT: illegal filename (%s)\n", basename);
-		printf("FAT: illegal filename (%s)\n", filename);
 		ret = -EINVAL;
 		goto exit;
 	}
@@ -1349,15 +1376,6 @@ int file_fat_write_at(const char *filename, loff_t pos, void *buffer,
 		char shortname[SHORT_NAME_SIZE];
 		int ndent;
 
-		if (itr->is_root) {
-			/* root dir cannot have "." or ".." */
-			if (!strcmp(l_filename, ".") ||
-			    !strcmp(l_filename, "..")) {
-				ret = -EINVAL;
-				goto exit;
-			}
-		}
-
 		if (pos) {
 			/* No hole allowed */
 			ret = -EINVAL;
@@ -1365,7 +1383,7 @@ int file_fat_write_at(const char *filename, loff_t pos, void *buffer,
 		}
 
 		/* Check if long name is needed */
-		ndent = set_name(itr, filename, shortname);
+		ndent = set_name(itr, basename, shortname);
 		if (ndent < 0) {
 			ret = ndent;
 			goto exit;
@@ -1375,7 +1393,7 @@ int file_fat_write_at(const char *filename, loff_t pos, void *buffer,
 			goto exit;
 		if (ndent > 1) {
 			/* Set long name entries */
-			ret = fill_dir_slot(itr, filename, shortname);
+			ret = fill_dir_slot(itr, basename, shortname);
 			if (ret)
 				goto exit;
 		}
@@ -1611,31 +1629,31 @@ exit:
 	return ret;
 }
 
-int fat_mkdir(const char *new_dirname)
+int fat_mkdir(const char *dirname)
 {
 	dir_entry *retdent;
 	fsdata datablock = { .fatbuf = NULL, };
 	fsdata *mydata = &datablock;
 	fat_itr *itr = NULL;
-	char *dirname_copy, *parent, *dirname;
+	char *dirname_copy, *parent, *basename;
 	char l_dirname[VFAT_MAXLEN_BYTES];
 	int ret = -1;
 	loff_t actwrite;
 	unsigned int bytesperclust;
 	dir_entry *dotdent = NULL;
 
-	dirname_copy = strdup(new_dirname);
+	dirname_copy = strdup(dirname);
 	if (!dirname_copy)
 		goto exit;
 
-	split_filename(dirname_copy, &parent, &dirname);
+	split_filename(dirname_copy, &parent, &basename);
-	if (!strlen(dirname)) {
+	if (!strlen(basename)) {
 		ret = -EINVAL;
 		goto exit;
 	}
 
-	if (normalize_longname(l_dirname, dirname)) {
+	if (normalize_longname(l_dirname, basename)) {
-		printf("FAT: illegal filename (%s)\n", dirname);
+		printf("FAT: illegal filename (%s)\n", basename);
 		ret = -EINVAL;
 		goto exit;
 	}
@@ -1678,7 +1696,7 @@ int fat_mkdir(const char *new_dirname)
 		}
 
 		/* Check if long name is needed */
-		ndent = set_name(itr, dirname, shortname);
+		ndent = set_name(itr, basename, shortname);
 		if (ndent < 0) {
 			ret = ndent;
 			goto exit;
@@ -1688,7 +1706,7 @@ int fat_mkdir(const char *new_dirname)
 			goto exit;
 		if (ndent > 1) {
 			/* Set long name entries */
-			ret = fill_dir_slot(itr, dirname, shortname);
+			ret = fill_dir_slot(itr, basename, shortname);
 			if (ret)
 				goto exit;
 		}

lib/efi_loader/efi_device_path_to_text.c

@@ -244,6 +244,21 @@ static char *dp_media(char *s, struct efi_device_path *dp)
 			     cddp->partition_start, cddp->partition_size);
 		break;
 	}
+	case DEVICE_PATH_SUB_TYPE_VENDOR_PATH: {
+		int i, n;
+		struct efi_device_path_vendor *vdp =
+			(struct efi_device_path_vendor *)dp;
+
+		s += sprintf(s, "VenMedia(%pUl", &vdp->guid);
+		n = (int)vdp->dp.length - sizeof(struct efi_device_path_vendor);
+		if (n > 0) {
+			s += sprintf(s, ",");
+			for (i = 0; i < n; ++i)
+				s += sprintf(s, "%02x", vdp->vendor_data[i]);
+		}
+		s += sprintf(s, ")");
+		break;
+	}
 	case DEVICE_PATH_SUB_TYPE_FILE_PATH: {
 		struct efi_device_path_file_path *fp =
 			(struct efi_device_path_file_path *)dp;

lib/efi_loader/efi_disk.c

@@ -19,6 +19,7 @@
 struct efi_system_partition efi_system_partition;
 
 const efi_guid_t efi_block_io_guid = EFI_BLOCK_IO_PROTOCOL_GUID;
+const efi_guid_t efi_system_partition_guid = PARTITION_SYSTEM_GUID;
 
 /**
  * struct efi_disk_obj - EFI disk object
@@ -362,6 +363,7 @@ static efi_status_t efi_disk_add_dev(
 {
 	struct efi_disk_obj *diskobj;
 	struct efi_object *handle;
+	const efi_guid_t *guid = NULL;
 	efi_status_t ret;
 
 	/* Don't add empty devices */
@@ -400,6 +402,8 @@ static efi_status_t efi_disk_add_dev(
 		efi_free_pool(node);
 		diskobj->offset = part_info->start;
 		diskobj->media.last_block = part_info->size - 1;
+		if (part_info->bootable & PART_EFI_SYSTEM_PARTITION)
+			guid = &efi_system_partition_guid;
 	} else {
 		diskobj->dp = efi_dp_from_part(desc, part);
 		diskobj->offset = 0;
@@ -417,7 +421,8 @@ static efi_status_t efi_disk_add_dev(
 	handle = &diskobj->header;
 	ret = EFI_CALL(efi_install_multiple_protocol_interfaces(
 			&handle, &efi_guid_device_path, diskobj->dp,
-			&efi_block_io_guid, &diskobj->ops, NULL));
+			&efi_block_io_guid, &diskobj->ops,
+			guid, NULL, NULL));
 	if (ret != EFI_SUCCESS)
 		return ret;
 
@@ -467,13 +472,7 @@ static efi_status_t efi_disk_add_dev(
 
 	/* Store first EFI system partition */
 	if (part && !efi_system_partition.if_type) {
-		int r;
+		if (part_info->bootable & PART_EFI_SYSTEM_PARTITION) {
-		struct disk_partition info;
-
-		r = part_get_info(desc, part, &info);
-		if (r)
-			return EFI_DEVICE_ERROR;
-		if (info.bootable & PART_EFI_SYSTEM_PARTITION) {
 			efi_system_partition.if_type = desc->if_type;
 			efi_system_partition.devnum = desc->devnum;
 			efi_system_partition.part = part;

lib/efi_loader/efi_dt_fixup.c

@@ -110,6 +110,7 @@ efi_dt_fixup(struct efi_dt_fixup_protocol *this, void *dtb,
 {
 	efi_status_t ret;
 	size_t required_size;
+	size_t total_size;
 	bootm_headers_t img = { 0 };
 
 	EFI_ENTRY("%p, %p, %p, %d", this, dtb, buffer_size, flags);
@@ -124,20 +125,20 @@ efi_dt_fixup(struct efi_dt_fixup_protocol *this, void *dtb,
 		goto out;
 	}
 	if (flags & EFI_DT_APPLY_FIXUPS) {
+		/* Check size */
 		required_size = fdt_off_dt_strings(dtb) +
 				fdt_size_dt_strings(dtb) +
 				0x3000;
-	} else {
+		total_size = fdt_totalsize(dtb);
-		required_size = fdt_totalsize(dtb);
+		if (required_size < total_size)
-	}
+			required_size = total_size;
 		if (required_size > *buffer_size) {
 			*buffer_size = required_size;
 			ret = EFI_BUFFER_TOO_SMALL;
 			goto out;
 		}
-	fdt_set_totalsize(dtb, *buffer_size);
 
-	if (flags & EFI_DT_APPLY_FIXUPS) {
+		fdt_set_totalsize(dtb, *buffer_size);
 		if (image_setup_libfdt(&img, dtb, 0, NULL)) {
 			log_err("failed to process device tree\n");
 			ret = EFI_INVALID_PARAMETER;
@@ -147,10 +148,10 @@ efi_dt_fixup(struct efi_dt_fixup_protocol *this, void *dtb,
 	if (flags & EFI_DT_RESERVE_MEMORY)
 		efi_carve_out_dt_rsv(dtb);
 
-	if (EFI_DT_INSTALL_TABLE) {
+	if (flags & EFI_DT_INSTALL_TABLE) {
 		ret = efi_install_configuration_table(&efi_guid_fdt, dtb);
 		if (ret != EFI_SUCCESS) {
-			log_err("ERROR: failed to install device tree\n");
+			log_err("failed to install device tree\n");
 			goto out;
 		}
 	}

lib/efi_selftest/dtbdump.c

@@ -9,6 +9,7 @@
 #include <common.h>
 #include <efi_api.h>
 #include <efi_dt_fixup.h>
+#include <part.h>
 
 #define BUFFER_SIZE 64
 #define ESC 0x17
@@ -27,6 +28,7 @@ static efi_handle_t handle;
 static struct efi_system_table *systable;
 static const efi_guid_t efi_dt_fixup_protocol_guid = EFI_DT_FIXUP_PROTOCOL_GUID;
 static const efi_guid_t efi_file_info_guid = EFI_FILE_INFO_GUID;
+static const efi_guid_t efi_system_partition_guid = PARTITION_SYSTEM_GUID;
 
 /**
  * print() - print string
@@ -230,6 +232,52 @@ void do_help(void)
 	error(L"exit       - exit the shell\r\n");
 }
 
+/**
+ * open_file_system() - open simple file system protocol
+ *
+ * file_system:	interface of the simple file system protocol
+ * Return:	status code
+ */
+static efi_status_t
+open_file_system(struct efi_simple_file_system_protocol **file_system)
+{
+	struct efi_loaded_image *loaded_image;
+	efi_status_t ret;
+	efi_handle_t *handle_buffer = NULL;
+	efi_uintn_t count;
+
+	ret = bs->open_protocol(handle, &loaded_image_guid,
+				(void **)&loaded_image, NULL, NULL,
+				EFI_OPEN_PROTOCOL_GET_PROTOCOL);
+	if (ret != EFI_SUCCESS) {
+		error(L"Loaded image protocol not found\r\n");
+		return ret;
+	}
+
+	/* Open the simple file system protocol on the same partition */
+	ret = bs->open_protocol(loaded_image->device_handle,
+				&guid_simple_file_system_protocol,
+				(void **)file_system, NULL, NULL,
+				EFI_OPEN_PROTOCOL_GET_PROTOCOL);
+	if (ret == EFI_SUCCESS)
+		return ret;
+
+	/* Open the simple file system protocol on the UEFI system partition */
+	ret = bs->locate_handle_buffer(BY_PROTOCOL, &efi_system_partition_guid,
+				       NULL, &count, &handle_buffer);
+	if (ret == EFI_SUCCESS && handle_buffer)
+		ret = bs->open_protocol(handle_buffer[0],
+					&guid_simple_file_system_protocol,
+					(void **)file_system, NULL, NULL,
+					EFI_OPEN_PROTOCOL_GET_PROTOCOL);
+	if (ret != EFI_SUCCESS)
+		error(L"Failed to open simple file system protocol\r\n");
+	if (handle)
+		bs->free_pool(handle_buffer);
+
+	return ret;
+}
+
 /**
  * do_load() - load and install device-tree
  *
@@ -239,7 +287,6 @@ void do_help(void)
 efi_status_t do_load(u16 *filename)
 {
 	struct efi_dt_fixup_protocol *dt_fixup_prot;
-	struct efi_loaded_image *loaded_image;
 	struct efi_simple_file_system_protocol *file_system;
 	struct efi_file_handle *root = NULL, *file = NULL;
 	u64 addr = 0;
@@ -258,22 +305,9 @@ efi_status_t do_load(u16 *filename)
 
 	filename = skip_whitespace(filename);
 
-	ret = bs->open_protocol(handle, &loaded_image_guid,
+	ret = open_file_system(&file_system);
-				(void **)&loaded_image, NULL, NULL,
+	if (ret != EFI_SUCCESS)
-				EFI_OPEN_PROTOCOL_GET_PROTOCOL);
-	if (ret != EFI_SUCCESS) {
-		error(L"Loaded image protocol not found\r\n");
-		return ret;
-	}
-	/* Open the simple file system protocol */
-	ret = bs->open_protocol(loaded_image->device_handle,
-				&guid_simple_file_system_protocol,
-				(void **)&file_system, NULL, NULL,
-				EFI_OPEN_PROTOCOL_GET_PROTOCOL);
-	if (ret != EFI_SUCCESS) {
-		error(L"Failed to open simple file system protocol\r\n");
 		goto out;
-	}
 
 	/* Open volume */
 	ret = file_system->open_volume(file_system, &root);
@@ -389,7 +423,6 @@ out:
  */
 efi_status_t do_save(u16 *filename)
 {
-	struct efi_loaded_image *loaded_image;
 	struct efi_simple_file_system_protocol *file_system;
 	efi_uintn_t dtb_size;
 	struct efi_file_handle *root, *file;
@@ -409,23 +442,9 @@ efi_status_t do_save(u16 *filename)
 
 	filename = skip_whitespace(filename);
 
-	ret = bs->open_protocol(handle, &loaded_image_guid,
+	ret = open_file_system(&file_system);
-				(void **)&loaded_image, NULL, NULL,
+	if (ret != EFI_SUCCESS)
-				EFI_OPEN_PROTOCOL_GET_PROTOCOL);
-	if (ret != EFI_SUCCESS) {
-		error(L"Loaded image protocol not found\r\n");
 		return ret;
-	}
-
-	/* Open the simple file system protocol */
-	ret = bs->open_protocol(loaded_image->device_handle,
-				&guid_simple_file_system_protocol,
-				(void **)&file_system, NULL, NULL,
-				EFI_OPEN_PROTOCOL_GET_PROTOCOL);
-	if (ret != EFI_SUCCESS) {
-		error(L"Failed to open simple file system protocol\r\n");
-		return ret;
-	}
 
 	/* Open volume */
 	ret = file_system->open_volume(file_system, &root);