]>
git.proxmox.com Git - mirror_ubuntu-zesty-kernel.git/blob - security/apparmor/crypto.c
2 * AppArmor security module
4 * This file contains AppArmor policy loading interface function definitions.
6 * Copyright 2013 Canonical Ltd.
8 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License as
10 * published by the Free Software Foundation, version 2 of the
13 * Fns to provide a checksum of policy that has been loaded this can be
14 * compared to userspace policy compiles to check loaded policy is what
18 #include <linux/crypto.h>
20 #include "include/apparmor.h"
21 #include "include/crypto.h"
23 static unsigned int apparmor_hash_size
;
25 static struct crypto_hash
*apparmor_tfm
;
27 unsigned int aa_hash_size(void)
29 return apparmor_hash_size
;
32 int aa_calc_profile_hash(struct aa_profile
*profile
, u32 version
, void *start
,
35 struct scatterlist sg
[2];
36 struct hash_desc desc
= {
41 u32 le32_version
= cpu_to_le32(version
);
47 sg_set_buf(&sg
[0], &le32_version
, 4);
48 sg_set_buf(&sg
[1], (u8
*) start
, len
);
50 profile
->hash
= kzalloc(apparmor_hash_size
, GFP_KERNEL
);
54 error
= crypto_hash_init(&desc
);
57 error
= crypto_hash_update(&desc
, &sg
[0], 4);
60 error
= crypto_hash_update(&desc
, &sg
[1], len
);
63 error
= crypto_hash_final(&desc
, profile
->hash
);
76 static int __init
init_profile_hash(void)
78 struct crypto_hash
*tfm
;
80 if (!apparmor_initialized
)
83 tfm
= crypto_alloc_hash("sha1", 0, CRYPTO_ALG_ASYNC
);
85 int error
= PTR_ERR(tfm
);
86 AA_ERROR("failed to setup profile sha1 hashing: %d\n", error
);
90 apparmor_hash_size
= crypto_hash_digestsize(apparmor_tfm
);
92 aa_info_message("AppArmor sha1 policy hashing enabled");
97 late_initcall(init_profile_hash
);