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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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1234567891011121314151617181920212223242526272829303132333435363738394041424344454647// SPDX-License-Identifier: GPL-2.0+/* * Module signature checker * * Copyright (C) 2012 Red Hat, Inc. All Rights Reserved. * Written by David Howells (dhowells@redhat.com) */
#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 != MODULE_SIGNATURE_TYPE_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;}