1 /*
2 * AppArmor security module
3 *
4 * This file contains AppArmor basic global and lib definitions
5 *
6 * Copyright (C) 1998-2008 Novell/SUSE
7 * Copyright 2009-2010 Canonical Ltd.
8 *
9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License as
11 * published by the Free Software Foundation, version 2 of the
12 * License.
13 */
14
15 #ifndef __APPARMOR_H
16 #define __APPARMOR_H
17
18 #include <linux/fs.h>
19
20 #include "match.h"
21
22 /* Control parameters settable through module/boot flags */
23 extern enum audit_mode aa_g_audit;
24 extern int aa_g_audit_header;
25 extern int aa_g_debug;
26 extern int aa_g_lock_policy;
27 extern int aa_g_logsyscall;
28 extern int aa_g_paranoid_load;
29 extern unsigned int aa_g_path_max;
30
31 /*
32 * DEBUG remains global (no per profile flag) since it is mostly used in sysctl
33 * which is not related to profile accesses.
34 */
35
36 #define AA_DEBUG(fmt, args...) \
37 do { \
38 if (aa_g_debug && printk_ratelimit()) \
39 printk(KERN_DEBUG "AppArmor: " fmt, ##args); \
40 } while (0)
41
42 #define AA_ERROR(fmt, args...) \
43 do { \
44 if (printk_ratelimit()) \
45 printk(KERN_ERR "AppArmor: " fmt, ##args); \
46 } while (0)
47
48 /* Flag indicating whether initialization completed */
49 extern int apparmor_initialized __initdata;
50
51 /* fn's in lib */
52 char *aa_split_fqname(char *args, char **ns_name);
53 void aa_info_message(const char *str);
54 void *kvmalloc(size_t size);
55 void kvfree(void *buffer);
56
57
58 /**
59 * aa_strneq - compare null terminated @str to a non null terminated substring
60 * @str: a null terminated string
61 * @sub: a substring, not necessarily null terminated
62 * @len: length of @sub to compare
63 *
64 * The @str string must be full consumed for this to be considered a match
65 */
aa_strneq(const char * str,const char * sub,int len)66 static inline bool aa_strneq(const char *str, const char *sub, int len)
67 {
68 return !strncmp(str, sub, len) && !str[len];
69 }
70
71 /**
72 * aa_dfa_null_transition - step to next state after null character
73 * @dfa: the dfa to match against
74 * @start: the state of the dfa to start matching in
75 *
76 * aa_dfa_null_transition transitions to the next state after a null
77 * character which is not used in standard matching and is only
78 * used to separate pairs.
79 */
aa_dfa_null_transition(struct aa_dfa * dfa,unsigned int start)80 static inline unsigned int aa_dfa_null_transition(struct aa_dfa *dfa,
81 unsigned int start)
82 {
83 /* the null transition only needs the string's null terminator byte */
84 return aa_dfa_match_len(dfa, start, "", 1);
85 }
86
mediated_filesystem(struct inode * inode)87 static inline bool mediated_filesystem(struct inode *inode)
88 {
89 return !(inode->i_sb->s_flags & MS_NOUSER);
90 }
91
92 #endif /* __APPARMOR_H */
93