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- // SPDX-License-Identifier: GPL-2.0+
- /*
- * Module signature checker
- *
- * Copyright (C) 2012 Red Hat, Inc. All Rights Reserved.
- * Written by David Howells ([email protected])
- */
- #include <linux/errno.h>
- #include <linux/printk.h>
- #include <linux/module_signature.h>
- #include <asm/byteorder.h>
- /**
- * mod_check_sig - check that the given signature is sane
- *
- * @ms: Signature to check.
- * @file_len: Size of the file to which @ms is appended.
- * @name: What is being checked. Used for error messages.
- */
- int mod_check_sig(const struct module_signature *ms, size_t file_len,
- const char *name)
- {
- if (be32_to_cpu(ms->sig_len) >= file_len - sizeof(*ms))
- return -EBADMSG;
- if (ms->id_type != PKEY_ID_PKCS7) {
- pr_err("%s: not signed with expected PKCS#7 message\n",
- name);
- return -ENOPKG;
- }
- if (ms->algo != 0 ||
- ms->hash != 0 ||
- ms->signer_len != 0 ||
- ms->key_id_len != 0 ||
- ms->__pad[0] != 0 ||
- ms->__pad[1] != 0 ||
- ms->__pad[2] != 0) {
- pr_err("%s: PKCS#7 signature info has unexpected non-zero params\n",
- name);
- return -EBADMSG;
- }
- return 0;
- }
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