From e618d1d285172232c2799bd175b51f63c846f777 Mon Sep 17 00:00:00 2001 From: Heinrich Schuchardt Date: Thu, 9 Sep 2021 08:22:58 +0200 Subject: [PATCH] efi_loader: function to get GUID for variable name 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 Reviewed-by: Ilias Apalodimas --- 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 8f666b2..03a3ecb 100644 --- a/include/efi_variable.h +++ b/include/efi_variable.h @@ -257,6 +257,14 @@ 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() * from the cached memory copy diff --git a/lib/efi_loader/efi_var_common.c b/lib/efi_loader/efi_var_common.c index e179932..3cbb7c9 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 * -- 2.7.4