1 // SPDX-License-Identifier: GPL-2.0
3 #include <linux/kernel.h>
4 #include <linux/sched.h>
5 #include <linux/cred.h>
8 #include <linux/slab.h>
9 #include <keys/asymmetric-type.h>
10 #include <keys/system_keyring.h>
11 #include "../integrity.h"
13 static efi_guid_t efi_cert_x509_guid __initdata = EFI_CERT_X509_GUID;
14 static efi_guid_t efi_cert_x509_sha256_guid __initdata =
15 EFI_CERT_X509_SHA256_GUID;
16 static efi_guid_t efi_cert_sha256_guid __initdata = EFI_CERT_SHA256_GUID;
21 static __init void uefi_blacklist_hash(const char *source, const void *data,
22 size_t len, const char *type,
27 hash = kmalloc(type_len + len * 2 + 1, GFP_KERNEL);
30 p = memcpy(hash, type, type_len);
32 bin2hex(p, data, len);
36 mark_hash_blacklisted(hash);
41 * Blacklist an X509 TBS hash.
43 static __init void uefi_blacklist_x509_tbs(const char *source,
44 const void *data, size_t len)
46 uefi_blacklist_hash(source, data, len, "tbs:", 4);
50 * Blacklist the hash of an executable.
52 static __init void uefi_blacklist_binary(const char *source,
53 const void *data, size_t len)
55 uefi_blacklist_hash(source, data, len, "bin:", 4);
59 * Add an X509 cert to the revocation list.
61 static __init void uefi_revocation_list_x509(const char *source,
62 const void *data, size_t len)
64 add_key_to_revocation_list(data, len);
68 * Return the appropriate handler for particular signature list types found in
69 * the UEFI db and MokListRT tables.
71 __init efi_element_handler_t get_handler_for_db(const efi_guid_t *sig_type)
73 if (efi_guidcmp(*sig_type, efi_cert_x509_guid) == 0)
74 return add_to_platform_keyring;
79 * Return the appropriate handler for particular signature list types found in
80 * the UEFI dbx and MokListXRT tables.
82 __init efi_element_handler_t get_handler_for_dbx(const efi_guid_t *sig_type)
84 if (efi_guidcmp(*sig_type, efi_cert_x509_sha256_guid) == 0)
85 return uefi_blacklist_x509_tbs;
86 if (efi_guidcmp(*sig_type, efi_cert_sha256_guid) == 0)
87 return uefi_blacklist_binary;
88 if (efi_guidcmp(*sig_type, efi_cert_x509_guid) == 0)
89 return uefi_revocation_list_x509;