security/apparmor/include/policy_unpack.h

   1 /*
   2  * AppArmor security module
   3  *
   4  * This file contains AppArmor policy loading interface function 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 __POLICY_INTERFACE_H
  16 #define __POLICY_INTERFACE_H
  17
  18 #include <linux/list.h>
  19 #include <linux/kref.h>
  20 #include <linux/dcache.h>
  21 #include <linux/workqueue.h>
  22
  23 struct aa_load_ent {
  24         struct list_head list;
  25         struct aa_profile *new;
  26         struct aa_profile *old;
  27         struct aa_profile *rename;
  28         const char *ns_name;
  29 };
  30
  31 void aa_load_ent_free(struct aa_load_ent *ent);
  32 struct aa_load_ent *aa_load_ent_alloc(void);
  33
  34 #define PACKED_FLAG_HAT         1
  35
  36 #define PACKED_MODE_ENFORCE     0
  37 #define PACKED_MODE_COMPLAIN    1
  38 #define PACKED_MODE_KILL        2
  39 #define PACKED_MODE_UNCONFINED  3
  40
  41 struct aa_ns;
  42
  43 enum {
  44         AAFS_LOADDATA_ABI = 0,
  45         AAFS_LOADDATA_REVISION,
  46         AAFS_LOADDATA_HASH,
  47         AAFS_LOADDATA_DATA,
  48         AAFS_LOADDATA_DIR,              /* must be last actual entry */
  49         AAFS_LOADDATA_NDENTS            /* count of entries */
  50 };
  51
  52 /*
  53  * struct aa_loaddata - buffer of policy raw_data set
  54  *
  55  * there is no loaddata ref for being on ns list, nor a ref from
  56  * d_inode(@dentry) when grab a ref from these, @ns->lock must be held
  57  * && __aa_get_loaddata() needs to be used, and the return value
  58  * checked, if NULL the loaddata is already being reaped and should be
  59  * considered dead.
  60  */
  61 struct aa_loaddata {
  62         struct kref count;
  63         struct list_head list;
  64         struct work_struct work;
  65         struct dentry *dents[AAFS_LOADDATA_NDENTS];
  66         struct aa_ns *ns;
  67         char *name;
  68         size_t size;
  69         long revision;                  /* the ns policy revision this caused */
  70         int abi;
  71         unsigned char *hash;
  72
  73         char data[];
  74 };
  75
  76 int aa_unpack(struct aa_loaddata *udata, struct list_head *lh, const char **ns);
  77
  78 /**
  79  * __aa_get_loaddata - get a reference count to uncounted data reference
  80  * @data: reference to get a count on
  81  *
  82  * Returns: pointer to reference OR NULL if race is lost and reference is
  83  *          being repeated.
  84  * Requires: @data->ns->lock held, and the return code MUST be checked
  85  *
  86  * Use only from inode->i_private and @data->list found references
  87  */
  88 static inline struct aa_loaddata *
  89 __aa_get_loaddata(struct aa_loaddata *data)
  90 {
  91         if (data && kref_get_unless_zero(&(data->count)))
  92                 return data;
  93
  94         return NULL;
  95 }
  96
  97 /**
  98  * aa_get_loaddata - get a reference count from a counted data reference
  99  * @data: reference to get a count on
 100  *
 101  * Returns: point to reference
 102  * Requires: @data to have a valid reference count on it. It is a bug
 103  *           if the race to reap can be encountered when it is used.
 104  */
 105 static inline struct aa_loaddata *
 106 aa_get_loaddata(struct aa_loaddata *data)
 107 {
 108         struct aa_loaddata *tmp = __aa_get_loaddata(data);
 109
 110         AA_BUG(data && !tmp);
 111
 112         return tmp;
 113 }
 114
 115 void __aa_loaddata_update(struct aa_loaddata *data, long revision);
 116 bool aa_rawdata_eq(struct aa_loaddata *l, struct aa_loaddata *r);
 117 void aa_loaddata_kref(struct kref *kref);
 118 struct aa_loaddata *aa_loaddata_alloc(size_t size);
 119 static inline void aa_put_loaddata(struct aa_loaddata *data)
 120 {
 121         if (data)
 122                 kref_put(&data->count, aa_loaddata_kref);
 123 }
 124
 125 #endif /* __POLICY_INTERFACE_H */