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efi_loader: function to get GUID for variable name

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In multiple places we need the default GUID matching a variable name.
The patch provides a library function. For secure boot related variables
like 'PK', 'KEK', 'db' a lookup table is used. For all other variable
names EFI_GLOBAL_VARIABLE is returned.

Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
Reviewed-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>
This commit is contained in:
Heinrich Schuchardt 2021-09-09 08:22:58 +02:00
parent d47671c631
commit e618d1d285
2 changed files with 17 additions and 0 deletions
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8
include/efi_variable.h
View File

@ -256,6 +256,14 @@ efi_status_t efi_init_secure_state(void);
enum efi_auth_var_type efi_auth_var_get_type(const u16 *name,
const efi_guid_t *guid);
/**
* efi_auth_var_get_guid() - get the predefined GUID for a variable name
*
* @name: name of UEFI variable
* Return: guid of UEFI variable
*/
const efi_guid_t *efi_auth_var_get_guid(const u16 *name);
/**
* efi_get_next_variable_name_mem() - Runtime common code across efi variable
* implementations for GetNextVariable()

9
lib/efi_loader/efi_var_common.c
View File

@ -385,6 +385,15 @@ enum efi_auth_var_type efi_auth_var_get_type(const u16 *name,
return EFI_AUTH_VAR_NONE;
}
const efi_guid_t *efi_auth_var_get_guid(const u16 *name)
{
for (size_t i = 0; i < ARRAY_SIZE(name_type); ++i) {
if (!u16_strcmp(name, name_type[i].name))
return name_type[i].guid;
}
return &efi_global_variable_guid;
}
/**
* efi_get_var() - read value of an EFI variable
*