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c8424e776b
IMA will use the module_signature format for append signatures, so export the relevant definitions and factor out the code which verifies that the appended signature trailer is valid. Also, create a CONFIG_MODULE_SIG_FORMAT option so that IMA can select it and be able to use mod_check_sig() without having to depend on either CONFIG_MODULE_SIG or CONFIG_MODULES. s390 duplicated the definition of struct module_signature so now they can use the new <linux/module_signature.h> header instead. Signed-off-by: Thiago Jung Bauermann <bauerman@linux.ibm.com> Acked-by: Jessica Yu <jeyu@kernel.org> Reviewed-by: Philipp Rudo <prudo@linux.ibm.com> Cc: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Mimi Zohar <zohar@linux.ibm.com>
45 lines
1.1 KiB
C
45 lines
1.1 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/* Module signature checker
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*
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* Copyright (C) 2012 Red Hat, Inc. All Rights Reserved.
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* Written by David Howells (dhowells@redhat.com)
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*/
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#include <linux/kernel.h>
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#include <linux/errno.h>
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#include <linux/module.h>
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#include <linux/module_signature.h>
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#include <linux/string.h>
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#include <linux/verification.h>
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#include <crypto/public_key.h>
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#include "module-internal.h"
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/*
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* Verify the signature on a module.
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*/
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int mod_verify_sig(const void *mod, struct load_info *info)
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{
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struct module_signature ms;
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size_t sig_len, modlen = info->len;
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int ret;
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pr_devel("==>%s(,%zu)\n", __func__, modlen);
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if (modlen <= sizeof(ms))
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return -EBADMSG;
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memcpy(&ms, mod + (modlen - sizeof(ms)), sizeof(ms));
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ret = mod_check_sig(&ms, modlen, info->name);
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if (ret)
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return ret;
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sig_len = be32_to_cpu(ms.sig_len);
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modlen -= sig_len + sizeof(ms);
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info->len = modlen;
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return verify_pkcs7_signature(mod, modlen, mod + modlen, sig_len,
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VERIFY_USE_SECONDARY_KEYRING,
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VERIFYING_MODULE_SIGNATURE,
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NULL, NULL);
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}
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