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Commit b5893468 authored by Peter Jones's avatar Peter Jones Committed by Sasha Levin
Browse files

efi: Use ucs2_as_utf8 in efivarfs instead of open coding a bad version 



[ Upstream commit e0d64e6a880e64545ad7d55786aa84ab76bac475 ]

Translate EFI's UCS-2 variable names to UTF-8 instead of just assuming
all variable names fit in ASCII.

Signed-off-by: default avatarPeter Jones <pjones@redhat.com>
Acked-by: default avatarMatthew Garrett <mjg59@coreos.com>
Tested-by: default avatarLee, Chun-Yi <jlee@suse.com>
Signed-off-by: default avatarMatt Fleming <matt@codeblueprint.co.uk>
Signed-off-by: default avatarSasha Levin <sasha.levin@oracle.com>
parent d05a3921

drivers/firmware/efi/efivars.c

+11 −18
Original line number Diff line number Diff line
@@ -540,38 +540,31 @@ static ssize_t efivar_delete(struct file *filp, struct kobject *kobj, 
static int

efivar_create_sysfs_entry(struct efivar_entry *new_var)

{

	int i, short_name_size;

	int short_name_size;

	char *short_name;

	unsigned long variable_name_size;

	efi_char16_t *variable_name;

	unsigned long utf8_name_size;

	efi_char16_t *variable_name = new_var->var.VariableName;

	int ret;



	variable_name = new_var->var.VariableName;

	variable_name_size = ucs2_strlen(variable_name) * sizeof(efi_char16_t);



	/*

	 * Length of the variable bytes in ASCII, plus the '-' separator,

	 * Length of the variable bytes in UTF8, plus the '-' separator,

	 * plus the GUID, plus trailing NUL

	 */

	short_name_size = variable_name_size / sizeof(efi_char16_t)

				+ 1 + EFI_VARIABLE_GUID_LEN + 1;



	short_name = kzalloc(short_name_size, GFP_KERNEL);

	utf8_name_size = ucs2_utf8size(variable_name);

	short_name_size = utf8_name_size + 1 + EFI_VARIABLE_GUID_LEN + 1;



	short_name = kmalloc(short_name_size, GFP_KERNEL);

	if (!short_name)

		return -ENOMEM;



	/* Convert Unicode to normal chars (assume top bits are 0),

	   ala UTF-8 */

	for (i=0; i < (int)(variable_name_size / sizeof(efi_char16_t)); i++) {

		short_name[i] = variable_name[i] & 0xFF;

	}

	ucs2_as_utf8(short_name, variable_name, short_name_size);



	/* This is ugly, but necessary to separate one vendor's

	   private variables from another's.         */



	*(short_name + strlen(short_name)) = '-';

	short_name[utf8_name_size] = '-';

	efi_guid_unparse(&new_var->var.VendorGuid,

			 short_name + strlen(short_name));

			 short_name + utf8_name_size + 1);



	new_var->kobj.kset = efivars_kset;

fs/efivarfs/super.c

+3 −4
Original line number Diff line number Diff line
@@ -118,7 +118,7 @@ static int efivarfs_callback(efi_char16_t *name16, efi_guid_t vendor, 
	struct dentry *dentry, *root = sb->s_root;

	unsigned long size = 0;

	char *name;

	int len, i;

	int len;

	int err = -ENOMEM;



	entry = kzalloc(sizeof(*entry), GFP_KERNEL);
@@ -128,15 +128,14 @@ static int efivarfs_callback(efi_char16_t *name16, efi_guid_t vendor, 
	memcpy(entry->var.VariableName, name16, name_size);

	memcpy(&(entry->var.VendorGuid), &vendor, sizeof(efi_guid_t));



	len = ucs2_strlen(entry->var.VariableName);

	len = ucs2_utf8size(entry->var.VariableName);



	/* name, plus '-', plus GUID, plus NUL*/

	name = kmalloc(len + 1 + EFI_VARIABLE_GUID_LEN + 1, GFP_KERNEL);

	if (!name)

		goto fail;



	for (i = 0; i < len; i++)

		name[i] = entry->var.VariableName[i] & 0xFF;

	ucs2_as_utf8(name, entry->var.VariableName, len);



	name[len] = '-';