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- // SPDX-License-Identifier: GPL-2.0-or-later
- /* Module signature checker
- *
- * Copyright (C) 2012 Red Hat, Inc. All Rights Reserved.
- * Written by David Howells (dhowells@redhat.com)
- */
- #include <linux/kernel.h>
- #include <linux/errno.h>
- #include <linux/module.h>
- #include <linux/module_signature.h>
- #include <linux/string.h>
- #include <linux/verification.h>
- #include <crypto/public_key.h>
- #include "module-internal.h"
- /*
- * Verify the signature on a module.
- */
- int mod_verify_sig(const void *mod, struct load_info *info)
- {
- struct module_signature ms;
- size_t sig_len, modlen = info->len;
- int ret;
- pr_devel("==>%s(,%zu)\n", __func__, modlen);
- if (modlen <= sizeof(ms))
- return -EBADMSG;
- memcpy(&ms, mod + (modlen - sizeof(ms)), sizeof(ms));
- ret = mod_check_sig(&ms, modlen, "module");
- if (ret)
- return ret;
- sig_len = be32_to_cpu(ms.sig_len);
- modlen -= sig_len + sizeof(ms);
- info->len = modlen;
- return verify_pkcs7_signature(mod, modlen, mod + modlen, sig_len,
- VERIFY_USE_SECONDARY_KEYRING,
- VERIFYING_MODULE_SIGNATURE,
- NULL, NULL);
- }
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