security/apparmor/include/apparmor.h

   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  */
  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  */
  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
  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 */