linux/security/integrity/platform_certs/efi_parser.c

// SPDX-License-Identifier: GPL-2.0+
/* EFI signature/key/certificate list parser
 *
 * Copyright (C) 2012, 2016 Red Hat, Inc. All Rights Reserved.
 * Written by David Howells ([email protected])
 */

#define pr_fmt(fmt) …
#include <linux/module.h>
#include <linux/printk.h>
#include <linux/err.h>
#include <linux/efi.h>

/**
 * parse_efi_signature_list - Parse an EFI signature list for certificates
 * @source: The source of the key
 * @data: The data blob to parse
 * @size: The size of the data blob
 * @get_handler_for_guid: Get the handler func for the sig type (or NULL)
 *
 * Parse an EFI signature list looking for elements of interest.  A list is
 * made up of a series of sublists, where all the elements in a sublist are of
 * the same type, but sublists can be of different types.
 *
 * For each sublist encountered, the @get_handler_for_guid function is called
 * with the type specifier GUID and returns either a pointer to a function to
 * handle elements of that type or NULL if the type is not of interest.
 *
 * If the sublist is of interest, each element is passed to the handler
 * function in turn.
 *
 * Error EBADMSG is returned if the list doesn't parse correctly and 0 is
 * returned if the list was parsed correctly.  No error can be returned from
 * the @get_handler_for_guid function or the element handler function it
 * returns.
 */
int __init parse_efi_signature_list(
	const char *source,
	const void *data, size_t size,
	efi_element_handler_t (*get_handler_for_guid)(const efi_guid_t *))
{ … }