[PATCH 2/4] efi_loader: function to get GUID for variable name

Ilias Apalodimas ilias.apalodimas at linaro.org
Sat Sep 11 16:13:03 CEST 2021


On Sat, Sep 11, 2021 at 09:28:30AM +0200, Heinrich Schuchardt wrote:
> In multiple places we need the default GUID used for variables like
> 'PK', 'KEK', 'db'. Provide a function for it.
> 
> Signed-off-by: Heinrich Schuchardt <xypron.glpk at gmx.de>
> ---
>  include/efi_variable.h          | 8 ++++++++
>  lib/efi_loader/efi_var_common.c | 9 +++++++++
>  2 files changed, 17 insertions(+)
> 
> diff --git a/include/efi_variable.h b/include/efi_variable.h
> index 8f666b2309..03a3ecb235 100644
> --- a/include/efi_variable.h
> +++ b/include/efi_variable.h
> @@ -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()
> diff --git a/lib/efi_loader/efi_var_common.c b/lib/efi_loader/efi_var_common.c
> index e179932124..3cbb7c96c2 100644
> --- a/lib/efi_loader/efi_var_common.c
> +++ b/lib/efi_loader/efi_var_common.c
> @@ -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
>   *
> --
> 2.30.2
> 

Reviewed-by: Ilias Apalodimas <ilias.apalodimas at linaro.org>


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