efi_loader: UEFI variable persistence
Persist non-volatile UEFI variables in a file on the EFI system partition.
The file is written whenever a non-volatile UEFI variable is changed after
initialization of the UEFI sub-system.
The file is read during the UEFI sub-system initialization to restore
non-volatile UEFI variables.
Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
diff --git a/lib/efi_loader/efi_variable.c b/lib/efi_loader/efi_variable.c
index 0d6bafc..8ed4b08 100644
--- a/lib/efi_loader/efi_variable.c
+++ b/lib/efi_loader/efi_variable.c
@@ -988,6 +988,11 @@
ret = EFI_SUCCESS;
}
+ /* Write non-volatile EFI variables to file */
+ if (attributes & EFI_VARIABLE_NON_VOLATILE &&
+ ret == EFI_SUCCESS && efi_obj_list_initialized == EFI_SUCCESS)
+ efi_var_to_file();
+
err:
free(native_name);
free(old_data);
@@ -1083,6 +1088,7 @@
*/
void efi_variables_boot_exit_notify(void)
{
+ /* Switch variable services functions to runtime version */
efi_runtime_services.get_variable = efi_get_variable_runtime;
efi_runtime_services.get_next_variable_name =
efi_get_next_variable_name_runtime;
@@ -1102,6 +1108,8 @@
efi_status_t ret;
ret = efi_init_secure_state();
+ if (ret != EFI_SUCCESS)
+ return ret;
- return ret;
+ return efi_var_from_file();
}