Merge tag 'efi-2020-04-rc4-5' of https://gitlab.denx.de/u-boot/custodians/u-boot-efi

Pull request for UEFI sub-system for efi-2020-04-rc4 (5)

This series contains bug fixes for the UEFI sub-system:

* report correct variable length in GetNextVariable()
* correct copying direction if freestanding memmove()
* remove const for parameter of GetNextVariableName()
* correct function descriptions

Unit tests are added and adjusted.

4 files changed, 44 insertions, 35 deletions

diff --git a/lib/efi_loader/efi_disk.c b/lib/efi_loader/efi_disk.c
index ed7fb3f7d3..fc0682bc48 100644
--- a/lib/efi_loader/efi_disk.c
+++ b/lib/efi_loader/efi_disk.c
@@ -222,15 +222,17 @@ static const struct efi_block_io block_io_disk_template = {
 	.flush_blocks = &efi_disk_flush_blocks,
 };
 
-/*
- * Get the simple file system protocol for a file device path.
+/**
+ * efi_fs_from_path() - retrieve simple file system protocol
+ *
+ * Gets the simple file system protocol for a file device path.
  *
  * The full path provided is split into device part and into a file
  * part. The device part is used to find the handle on which the
  * simple file system protocol is installed.
  *
- * @full_path	device path including device and file
- * @return	simple file system protocol
+ * @full_path:	device path including device and file
+ * Return:	simple file system protocol
  */
 struct efi_simple_file_system_protocol *
 efi_fs_from_path(struct efi_device_path *full_path)
@@ -285,15 +287,15 @@ static int efi_fs_exists(struct blk_desc *desc, int part)
 }
 
 /*
- * Create a handle for a partition or disk
+ * efi_disk_add_dev() - create a handle for a partition or disk
  *
- * @parent	parent handle
- * @dp_parent	parent device path
- * @if_typename interface name for block device
- * @desc	internal block device
- * @dev_index   device index for block device
- * @offset	offset into disk for simple partitions
- * @return	disk object
+ * @parent:		parent handle
+ * @dp_parent:		parent device path
+ * @if_typename:	interface name for block device
+ * @desc:		internal block device
+ * @dev_index:		device index for block device
+ * @offset:		offset into disk for simple partitions
+ * Return:		disk object
  */
 static efi_status_t efi_disk_add_dev(
 				efi_handle_t parent,
@@ -365,7 +367,7 @@ static efi_status_t efi_disk_add_dev(
 	diskobj->media.block_size = desc->blksz;
 	diskobj->media.io_align = desc->blksz;
 	diskobj->media.last_block = desc->lba - offset;
-	if (part != 0)
+	if (part)
 		diskobj->media.logical_partition = 1;
 	diskobj->ops.media = &diskobj->media;
 	if (disk)
@@ -373,15 +375,17 @@ static efi_status_t efi_disk_add_dev(
 	return EFI_SUCCESS;
 }
 
-/*
- * Create handles and protocols for the partitions of a block device
+/**
+ * efi_disk_create_partitions() - create handles and protocols for partitions
  *
- * @parent		handle of the parent disk
- * @blk_desc		block device
- * @if_typename		interface type
- * @diskid		device number
- * @pdevname		device name
- * @return		number of partitions created
+ * Create handles and protocols for the partitions of a block device.
+ *
+ * @parent:		handle of the parent disk
+ * @blk_desc:		block device
+ * @if_typename:	interface type
+ * @diskid:		device number
+ * @pdevname:		device name
+ * Return:		number of partitions created
  */
 int efi_disk_create_partitions(efi_handle_t parent, struct blk_desc *desc,
 			       const char *if_typename, int diskid,
@@ -418,16 +422,20 @@ int efi_disk_create_partitions(efi_handle_t parent, struct blk_desc *desc,
 	return disks;
 }
 
-/*
+/**
+ * efi_disk_register() - register block devices
+ *
  * U-Boot doesn't have a list of all online disk devices. So when running our
  * EFI payload, we scan through all of the potentially available ones and
  * store them in our object pool.
  *
+ * This function is called in efi_init_obj_list().
+ *
  * TODO(sjg@chromium.org): Actually with CONFIG_BLK, U-Boot does have this.
  * Consider converting the code to look up devices as needed. The EFI device
  * could be a child of the UCLASS_BLK block device, perhaps.
  *
- * This gets called from do_bootefi_exec().
+ * Return:	status code
  */
 efi_status_t efi_disk_register(void)
 {
diff --git a/lib/efi_loader/efi_freestanding.c b/lib/efi_loader/efi_freestanding.c
index dcf5d1c49a..bd0dff162f 100644
--- a/lib/efi_loader/efi_freestanding.c
+++ b/lib/efi_loader/efi_freestanding.c
@@ -47,7 +47,7 @@ void *memmove(void *dest, const void *src, size_t n)
 	u8 *d = dest;
 	const u8 *s = src;
 
-	if (d >= s) {
+	if (d <= s) {
 		for (; n; --n)
 			*d++ = *s++;
 	} else {
diff --git a/lib/efi_loader/efi_runtime.c b/lib/efi_loader/efi_runtime.c
index 4be51335bc..6a25acbbcd 100644
--- a/lib/efi_loader/efi_runtime.c
+++ b/lib/efi_loader/efi_runtime.c
@@ -483,7 +483,7 @@ static __efi_runtime efi_status_t EFIAPI efi_convert_pointer_runtime(
 }
 
 /**
- * efi_convert_pointer_runtime() - convert from physical to virtual pointer
+ * efi_convert_pointer() - convert from physical to virtual pointer
  *
  * This function implements the ConvertPointer() runtime service until
  * the first call to SetVirtualAddressMap().
@@ -493,7 +493,7 @@ static __efi_runtime efi_status_t EFIAPI efi_convert_pointer_runtime(
  *
  * @debug_disposition:	indicates if pointer may be converted to NULL
  * @address:		pointer to be converted
- * Return:		status code EFI_UNSUPPORTED
+ * Return:		status code
  */
 static __efi_runtime efi_status_t EFIAPI efi_convert_pointer(
 			efi_uintn_t debug_disposition, void **address)
diff --git a/lib/efi_loader/efi_variable.c b/lib/efi_loader/efi_variable.c
index c316bdfec0..fe2f264591 100644
--- a/lib/efi_loader/efi_variable.c
+++ b/lib/efi_loader/efi_variable.c
@@ -1,8 +1,8 @@
 // SPDX-License-Identifier: GPL-2.0+
 /*
- *  EFI utils
+ * UEFI runtime variable services
  *
- *  Copyright (c) 2017 Rob Clark
+ * Copyright (c) 2017 Rob Clark
  */
 
 #include <common.h>
@@ -273,7 +273,8 @@ static efi_status_t parse_uboot_variable(char *variable,
 					 u32 *attributes)
 {
 	char *guid, *name, *end, c;
-	unsigned long name_len;
+	size_t name_len;
+	efi_uintn_t old_variable_name_size;
 	u16 *p;
 
 	guid = strchr(variable, '_');
@@ -289,17 +290,17 @@ static efi_status_t parse_uboot_variable(char *variable,
 		return EFI_INVALID_PARAMETER;
 
 	name_len = end - name;
-	if (*variable_name_size < (name_len + 1)) {
-		*variable_name_size = name_len + 1;
+	old_variable_name_size = *variable_name_size;
+	*variable_name_size = sizeof(u16) * (name_len + 1);
+	if (old_variable_name_size < *variable_name_size)
 		return EFI_BUFFER_TOO_SMALL;
-	}
+
 	end++; /* point to value */
 
 	/* variable name */
 	p = variable_name;
 	utf8_utf16_strncpy(&p, name, name_len);
 	variable_name[name_len] = 0;
-	*variable_name_size = name_len + 1;
 
 	/* guid */
 	c = *(name - 1);
@@ -329,7 +330,7 @@ static efi_status_t parse_uboot_variable(char *variable,
  */
 efi_status_t EFIAPI efi_get_next_variable_name(efi_uintn_t *variable_name_size,
 					       u16 *variable_name,
-					       const efi_guid_t *vendor)
+					       efi_guid_t *vendor)
 {
 	char *native_name, *variable;
 	ssize_t name_len, list_len;
@@ -597,7 +598,7 @@ efi_get_variable_runtime(u16 *variable_name, const efi_guid_t *vendor,
  */
 static efi_status_t __efi_runtime EFIAPI
 efi_get_next_variable_name_runtime(efi_uintn_t *variable_name_size,
-				   u16 *variable_name, const efi_guid_t *vendor)
+				   u16 *variable_name, efi_guid_t *vendor)
 {
 	return EFI_UNSUPPORTED;
 }