efi/libstub: Take command line overrides into account for loaded files

When CONFIG_CMDLINE_OVERRIDE or CONFIG_CMDLINE_FORCE are configured, the
command line provided by the boot stack should be ignored, and only the
built-in command line should be taken into account.

Add the required handling of this when dealing with initrd= or dtb=
command line options in the EFI stub.

Signed-off-by: Ard Biesheuvel <ardb@kernel.org>

Author: ardbiesheuvel

drivers/firmware/efi/libstub/file.c

@@ -195,7 +195,8 @@ efi_status_t handle_cmdline_files(efi_loaded_image_t *image,
 				  unsigned long *load_addr,
 				  unsigned long *load_size)
 {
-	const bool ignore_load_options = false;
+	const bool ignore_load_options = IS_ENABLED(CONFIG_CMDLINE_OVERRIDE) ||
+					 IS_ENABLED(CONFIG_CMDLINE_FORCE);
 	const efi_char16_t *cmdline = efi_table_attr(image, load_options);
 	u32 cmdline_len = efi_table_attr(image, load_options_size);
 	unsigned long efi_chunk_size = ULONG_MAX;