| 1 | |
| 2 | |
| 3 | *
|
| 4 | * Copyright (C) 2012 Red Hat, Inc. All Rights Reserved.
|
| 5 | * Written by David Howells ([email protected])
|
| 6 |
|
| 7 |
|
| 8 | #include <linux/kernel.h>
|
| 9 | #include <linux/errno.h>
|
| 10 | #include <linux/module.h>
|
| 11 | #include <linux/module_signature.h>
|
| 12 | #include <linux/string.h>
|
| 13 | #include <linux/verification.h>
|
| 14 | #include <crypto/public_key.h>
|
| 15 | #include "module-internal.h"
|
| 16 |
|
| 17 | |
| 18 | * Verify the signature on a module.
|
| 19 |
|
| 20 | int mod_verify_sig(const void *mod, struct load_info *info)
|
| 21 | {
|
| 22 | struct module_signature ms;
|
| 23 | size_t sig_len, modlen = info->len;
|
| 24 | int ret;
|
| 25 |
|
| 26 | pr_devel("==>%s(,%zu)\n", __func__, modlen);
|
| 27 |
|
| 28 | if (modlen <= sizeof(ms))
|
| 29 | return -EBADMSG;
|
| 30 |
|
| 31 | memcpy(&ms, mod + (modlen - sizeof(ms)), sizeof(ms));
|
| 32 |
|
| 33 | ret = mod_check_sig(&ms, modlen, "module");
|
| 34 | if (ret)
|
| 35 | return ret;
|
| 36 |
|
| 37 | sig_len = be32_to_cpu(ms.sig_len);
|
| 38 | modlen -= sig_len + sizeof(ms);
|
| 39 | info->len = modlen;
|
| 40 |
|
| 41 | return verify_pkcs7_signature(mod, modlen, mod + modlen, sig_len,
|
| 42 | VERIFY_USE_SECONDARY_KEYRING,
|
| 43 | VERIFYING_MODULE_SIGNATURE,
|
| 44 | NULL, NULL);
|
| 45 | }
|