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 --- v3: no change v2: adjust function documentation --- include/efi_variable.h | 11 +++++++++++ lib/efi_loader/efi_var_common.c | 9 +++++++++ 2 files changed, 20 insertions(+)
diff --git a/include/efi_variable.h b/include/efi_variable.h index 8f666b2309..74909e8ec6 100644 --- a/include/efi_variable.h +++ b/include/efi_variable.h @@ -256,6 +256,17 @@ 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 + * + * For secure boot related variables a lookup table is used to determine + * the GUID. For all other variables EFI_GLOBAL_VARIABLE is returned. + * + * @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 *